|Michigan Tech's Open Sustainability Technology Lab.|
Google scholar Searches[edit | edit source]
- Sterilization of ABS
- Cleaning of ABS
- testing of FDM materials
- Cleaning of 3D printed parts
- Harness design
- Universal clip on
- Universal harness attachment
- Clip on attachment
- Harness clip
- Harness attachment
- Harness holder
- Harness attachment holder
- Clip holder
- Hose holder
- Harness accessories
- Workers breathing zone
- Personal Sampling pump
- Active sampling
- Personal sampler cyclone
- Mechanical properties of additively manufactured abs
- Failure analysis of additive manufactured abs
Books[edit | edit source]
NIOSH Manual of Analytical Methods[edit | edit source]
NIOSH Manual of Analytical Methods, 1994, Fourth Edition
"Clip the cyclone assembly to the worker's label and the personal sampling pump to the belt. Ensure that cyclone hangs vertically. Explain to the worker why the cyclone can't be inverted"
Aerosol Tecnology[edit | edit source]
Hinds, W.C., 1999. Aerosol Tecnology, Properties, Beahavior and measurements of airborne particles, Second. ed. John wiley & Sons Inc. ISBN 978-0-470-02725
- Basic information about airborne particles, icluding most common measuring principles
Aerosol Sampling[edit | edit source]
Vincent, James H. 2007. Aerosol sampling, Science, standards, instrumentation and Applications. John Wiley & Sons Inc.
- History and sampling equipment (also standards and about health guidelines)
Chemistry, Emission Control, Radioactive Pollution and Indoor Air Quality[edit | edit source]
Chemistry, Emission Control, Radioactive Pollution and Indoor Air Quality, Edited By Nicola Mazzeo 2011.
- Basic book about Air quality
Additive manufacturing technologies[edit | edit source]
Gibson, I., Rosen, D.W., Stucker, B., 2015. Additive manufacturing technologies, Rapid Prototyping to Direct Digital Manufacturing, Second. ed. Springer, New York. 
- Basic information about 3D printing
Open-Source Lab : How to Build Your Own Hardware and Reduce Research Costs[edit | edit source]
J.M. Pearce, "Open-Source Lab: How to Build Your Own Hardware and Reduce Research Costs", Elsevier, 2014 
Open-Source Lab: How to Build Your Own Hardware and Reduce Scientific Research Costs details the development of the free and open-source hardware revolution. The combination of open-source 3D printing and microcontrollers running on free software enables scientists, engineers, and lab personnel in every discipline to develop powerful research tools at unprecedented low costs. After reading Open-Source Lab, you will be able to: Lower equipment costs by making your own hardware build open-source hardware for scientific research actively participate in a community in which scientific results are more easily replicated and cited numerous examples of technologies and the open-source user and developer communities that support them instructions on how to take advantage of digital design sharing explanations of Arduinos and RepRaps for scientific use. A detailed guide to open-source hardware licenses and basic principles of intellectual property.
- Open licensing and benefits of sharing.
The 3D Printing Handbook[edit | edit source]
Redwood, B., Schöffer, F., Garret, B., 2017. The 3D Printing Handbook. 3D Hubs. 
- Basic information and guidelines for technologies, design and applications of 3D printing
Articles[edit | edit source]
The Location of Personal Sampler Filter Heads[edit | edit source]
B. B. Chatterjee M.B, M. K. Williams D.M, Joan Walford A.I.S & E. King B.Sc (1968) The Location of Personal Sampler Filter Heads, American Industrial Hygiene Association Journal, 30:6, 643-645, DOI: 10.1080/00028896909343188
Fifteen pasters in an electric accumulator factory each wore two personal samplers simultaneously for two consecutive shifts. The filter heads were attached to the upper left chest, one about 5 inches below the other. During the second shift the locations of the two heads were interchanged. The mean concentration obtained with the filter heads in the upper position was 0.181 mg/m3, while that obtained in the lower position was 0.225 mg/m3. The difference was 22% of the overall mean, and statistically highly significant (p < 0.01). Differences between the six samplers used were not significant. It was concluded that the location of the filter head should be defined more precisely than has been suggested for other jobs, and that the findings will be of particular importance when deriving threshold limit values.
- Trying to find the whole article
MEASUREMENT OF PERSONAL EXPOSURE TO 1,1,1-TRICHLOROETHANE AND TRICHLOROETHYLENE USING AN INEXPENSIVE SAMPLING DEVICE AND BATTERY-OPERATED PUMP[edit | edit source]
SIMMONS, J.H., MOSS, I.M., 1973. MEASUREMENT OF PERSONAL EXPOSURE TO 1,1,1-TRICHLOROETHANE AND TRICHLOROETHYLENE USING AN INEXPENSIVE SAMPLING DEVICE AND BATTERY-OPERATED PUMP. The Annals of Occupational Hygiene 16, 47–49. https://doi.org/10.1093/annhyg/16.1.47
The vapours of trichloroethylene and/or 1,1,1-trichloroethane are trapped on silica gel contained in a robust sampling tube made from a galvanized iron pipe connector and Simplifix couplings. Air from the worker's breathing zone is sucked through the tube by a battery operated personal sampling pump, sampler and pump being held on a harness fitted to the worker. Adsorbed solvent is eluted with methanol and estimated by gas chromatography using Chromosorb 101 as stationary phase. Mean exposure over a shift can be determined and related to parallel physiological measurements.
- Personal sampling tube was devised and tested with exposure to Tris
Monitoring Real-time Aerosol Distribution in the Breathing Zone[edit | edit source]
CORINNE A. MARTINELLI, NAOMI H. HARLEY, MORTON LIPPMANN & BEVERLY S. COHEN (2010) Monitoring Real-time Aerosol Distribution in the Breathing Zone, American Industrial Hygiene Association Journal, 44:4, 280-285, DOI: 10.1080/15298668391404806
A prototype air sampling, data recording, and data retrieval system was developed for monitoring aerosol concentrations in a worker's breathing zone. Three continuous-reading, light-scattering aerosol monitors and a tape recorder were incorporated into a specially designed and fabricated backpack for detailed field monitoring of both temporal and spatial variability in aerosol concentrations within the breathing zone. The backpack was worn by workers in a beryllium refinery. The aerosol which passed through each monitor was collected on a back-up filter for later chemical analysis for Be and Cu. The aerosol concentrations were recorded on magnetic tape as a function of time. The recorded signals were subsequently transcribed onto a strip chart recorder, then evaluated using a microcomputer with graphics capability. Field measurements made of the aerosol concentration at the forehead, nose, and lapel of operators during the melting and casting of beryllium-copper alloy demonstrated that there is considerable variability in concentration at different locations within the breathing zone. They also showed that operations resulting in worker exposure can be identified, and the precise time and duration of exposure can be determined.
- Trying to find the whole article, The packback design could be really interesting!
The TEAM Study: Personal Exposures to Toxic Substances in Air, Drinking Water, and Breath of 400 Residents of New Jersey, North Carolina, and North Dakota[edit | edit source]
LANCE A. WALLACE AND EDO D. PELLIZZARI, TYLER O. HARTWELL, CHARLES SPARACINO, ROY WHITMORE, LINDA SHELDON, HARVEY ZELON, AND REBECCA PERRITT
Received July 25, 1986 Abstract EPA's TEAM Study has measured exposures to 20 volatile organic compounds in personal air, outdoor air, drinking water, and breath of -400 residents of New Jersey, North Carolina, and North Dakota. All residents were selected by a probability sampling scheme to represent 128,000 inhabitants of Elizabeth and Bayonne, New Jersey, 131,000 residents of Greensboro, North Carolina, and 7000 residents of Devils Lake, North Dakota. Participants carried a personal monitor to collect two 12-hr air samples and gave a breath sample at the end of the day. Two consecutive 12-hr outdoor air samples were also collected on identical Tenax cartridges in the backyards of some of the participants. About 5000 samples were collected, of which 1500 were quality control samples. Ten compounds were often present in personal air and breath samples at all locations. Personal exposures were consistently higher than outdoor concentrations for these chemicals and were sometimes 10 times the outdoor concentrations. Indoor sources appeared to be responsible for much of the difference. Breath concentrations also often exceeded outdoor concentrations and correlated more strongly with personal exposures than with outdoor concentrations. Some activities (smoking, visiting dry cleaners or service stations) and occupations (chemical, paint, and plastics plants) were associated with significantly elevated exposures and breath levels for certain toxic chemicals. Homes with smokers had significantly increased benzene and styrene levels in indoor air. Residence near major point sources did not affect exposure. © 1987 Academic Press, Inc.
- 1979-1985 goal develop methods for individual total exposure
- one part of studies
- Personal monitor
Evaluation of the SKC Personal Respirable Dust Sampling Cyclone[edit | edit source]
Göran Lidén (1993) Evaluation of the SKC Personal Respirable Dust Sampling Cyclone, Applied Occupational and Environmental Hygiene, 8:3, 178-190, DOI: 10.1080/1047322X.1993.10389189
Three generations of the SKC cyclone have been evaluated. The cyclone was intended to emulate the British Safety in Mines Personal Equipment for Dust Sampling (SIMPEDS). The size-selection efficiency of the first cyclone generation was evaluated by measuring its penetration curve with a TSI APS 3300, and was found to have a pronounced tail for large particle sizes. For smaller particle sizes the size-selection efficiency was very similar to that of the SIMPEDS. The cyclone's size-selection caused it to considerably oversample large particles, relative to both the SIMPEDS and the British Medical Research Council definition of respirable dust, but for smaller particles it compared favorably with the SIMPEDS. The second cyclone generation sampled somewhat more than the first. The third generation samples more closely to the SIMPEDS cyclone. The coefficient of variation for the third cyclone generation was estimated to be 0.038 for a foundry aerosol. Possible merits of the first two SKC cyclone generations are discussed in light of the new respirable sampling convention about to be adopted by the Comité Européen de Normalisation, the International Standards Organisation, and the American Conference of Governmental Industrial Hygienists.
- We redesigned one of skc cyclone
- Asked for the the whole article
Design and validation of a high-flow personal sampler for PM2.5[edit | edit source]
ADAMS, H.S., KENNY, L.C., NIEUWENHUIJSEN, M.J., COLVILE, R.N., GUSSMAN, R.A., 2001. Design and validation of a high-flow personal sampler for PM2.5. Journal Of Exposure Analysis And Environmental Epidemiology 11, 5.
Abstract: A high - flow personal sampler ( HFPS ) for airborne particulate matter has been developed and fully characterised, and validation tests have been carried out. The sampler is a low - cost gravimetric instrument designed to collect particulate matter with a 50% cut point at 2.5�m aerodynamic equivalent diameter(PM2.5) , where size selection is achieved by the use of porous polyurethane foam. Development of a porous foam selector was chosen over a cyclone or impactor due to the lightweight, low - cost, and compact design that could be achieved. The sampler flow rate of 16 l / min is achieved using a portable, flow -controlled pump; this flow rate is far higher than that of conventional personal samplers and the HFPS can therefore be used for personal sampling in the ambient environment over short sampling periods of much less than 24 h. The HFPS is currently being used in a study of particle exposure of urban transport users ( cyclists, car drivers, bus and Underground rail passengers ) where personal sampling over short time periods representing typical commuter journey times is required. The HFPS was fully characterised in chamber studies with a TSI aerodynamic particle sizer ( APS ) . The sampler was then validated against a co - located U.S. EPA Federal Reference PM2.5 Well Impactor Ninety Six ( WINS ) and a KTL cyclone, and parallel testing was performed. Initial testing showed some penetration of particles through the porous foam structure; applying an oil coating to the foam eliminated this problem. Chamber testing was carried out on a number of different selector prototypes, with the final design giving a 50% penetration diameter ( i.e.,d 50)of2.4�m at 16 l/ min. The new sampler exhibited good agreement in three sets of co - located tests with established samplers, and parallel testing showed excellent agreement between paired HFPS samplers.
- New Personal sampler designed to be attached to commuters (cyclist etc.)
Anisotropic material properties of fused deposition modeling ABS[edit | edit source]
Sung‐Hoon Ahn, Michael Montero, Dan Odell, Shad Roundy, Paul K. Wright, "Anisotropic material properties of fused deposition modeling ABS",Rapid Prototyping Journal, Vol(8), Issue 4, 248-257, 2002. 
Abstract Rapid Prototyping (RP) technologies provide the ability to fabricate initial prototypes from various model materials. Stratasys Fused Deposition Modeling (FDM) is a typical RP process that can fabricate prototypes out of ABS plastic. To predict the mechanical behavior of FDM parts, it is critical to understand the material properties of the raw FDM process material, and the effect that FDM build parameters have on anisotropic material properties. This paper characterizes the properties of ABS parts fabricated by the FDM 1650. Using a Design of Experiment (DOE) approach, the process parameters of FDM, such as raster orientation, air gap, bead width, color, and model temperature were examined. Tensile strengths and compressive strengths of directionally fabricated specimens were measured and compared with injection molded FDM ABS P400 material. For the FDM parts made with a 0.003 inch overlap between roads, the typical tensile strength ranged between 65 and 72 percent of the strength of injection molded ABS P400. The compressive strength ranged from 80 to 90 percent of the injection molded FDM ABS. Several build rules for designing FDM parts were formulated based on experimental results.
- Parts made by FDM have ansiotropic properties
- Air gap and raster orientation affect TS greatest while bead width, model temp. and color have little effect
- Negative air gap: increase in strength and stiffness
- Load should be carried along axial fibres.
- Compressive str. higher than TS
- Not affected much by build orientation
- TS: 65-72% of IM ABS - ASTM D3039 (ASTM, 1976) (Horizontal orientation: axial greatest)
- CS: 80-90% of IM ABS - ASTM D3039 (ASTM, 1976) (Horizontal orientation: greater)
Exposure to airborne allergens: a review of sampling methods[edit | edit source]
Received 18th March 2002 , Accepted 14th June 2002 First published on 7th August 2002 
A number of methods are used to assess exposure to high-molecular weight allergens. In the occupational setting, airborne dust is often collected on filters using pumps, the filters are eluted and allergen content in the eluate analysed using immunoassays. Collecting inhalable dust using person-carried pumps may be considered the gold standard. Other allergen sampling methods are available. Recently, a method that collects nasally inhaled dust on adhesive surfaces within nasal samplers has been developed. Allergen content can be analysed in eluates using sensitive enzyme immunoassays, or allergen-bearing particles can be immunostained using antibodies, and studied under the microscope. Settling airborne dust can be collected in petri dishes, a cheap and simple method that has been utilised in large-scale exposure studies. Collection of reservoir dust from surfaces using vacuum cleaners with a dust collector is commonly used to measure pet or mite allergens in homes. The sampling methods differ in properties and relevance to personal allergen exposure. Since methods for all steps from sampling to analysis differ between laboratories, determining occupational exposure limits for protein allergens is today unfeasible. A general standardisation of methods is needed.
- "A summary of some positive and negative features regarding sampling of aeroallergens using person-carried pumps is shown in Table 1."
Personal Exposure to Ultrafine Particles in the Workplace: Exploring Sampling Techniques and Strategies[edit | edit source]
BROUWER, D.H., GIJSBERS, J.H.J., LURVINK, M.W.M., 2004. Personal Exposure to Ultrafine Particles in the Workplace: Exploring Sampling Techniques and Strategies. The Annals of Occupational Hygiene 48, 439–453. https://doi.org/10.1093/annhyg/meh040
Recently, toxicological and epidemiological studies on health effects related to particle exposure suggest that ‘ultrafine particles’ (particles with an aerodynamic diameter of <100 nm) may cause severe health effects after inhalation. Although the toxicological mechanisms for these effects have not yet been explained, it is apparent that measuring exposures against mass alone is not sufficient. It is also necessary to consider exposures against surface area and number concentration. From earlier research it was hypothesized that results on number concentration and particle distributions may vary with distance to the source, limiting the reliability of estimates of personal exposure from results which were obtained using static measurement equipment. Therefore, a workplace study was conducted to explore the performance of measurement methods in a multi-source emission scenario as part of a sampling strategy to estimate personal exposure. In addition, a laboratory study was conducted to determine possible influences of both distance to source and time course on particle number concentration and particle size distribution. In both studies different measurement equipment and techniques were used to characterize (total) particle number concentration. These included a condensation particle counter (CPC), a scanning mobility particle sizer (SMPS) and an electrical low pressure impactor (ELPI). For the present studies CPC devices seemed to perform well for the identification of particle emission sources. The range of ultrafine particle number concentration can be detected by both SMPS and ELPI. An important advantage of the ELPI is that aerosols with ultrafine sizes can be collected for further analysis. Specific surface area of the aerosols can be estimated using gas adsorption analysis; however, with this technique ultrafine particles cannot be distinguished from particles with non-ultrafine sizes. Consequently, estimates based on samples collected from the breathing zone and scanning electron microscopic analysis may give a more reliable estimate of the specific surface area of the ultrafine particles responsible for personal exposure. The results of both the experimental and the workplace study suggest both spatial and temporal variation in total number concentration and aerosol size distribution. Therefore, the results obtained from static measurements and grab sampling should be interpreted with care as estimates of personal exposure. For evaluation of workplace exposure to ultrafine particles it is recommended that all relevant characteristics of such exposure are measured as part of a well-designed sampling strategy.
- "It is important that the sampling of aerosols should be either (ultrafine) size-selective, e.g. ELPI samples, or from the breathing zone, e.g. personal air samples."
Advances in passive sampling in environmental studies[edit | edit source]
Kot-Wasik, A., Zabiegała, B., Urbanowicz, M., Dominiak, E., Wasik, A., Namieśnik, J., 2007. Advances in passive sampling in environmental studies. Analytica Chimica Acta 602, 141–163. https://doi.org/10.1016/j.aca.2007.09.013
Passive sampling is based on the phenomenon of mass transport due to the difference between chemical potentials of analytes in a given environmental compartment and the collection medium inside a dosimeter. The subsequent laboratory procedure (i.e. extraction, identification and determination of analytes) is the same as in the case of classic sampling techniques.
Passive sampling techniques are characterized by simplicity with regard to the dosimeter's construction as well as its maintenance. Therefore, they find ever increasing application in the field of environmental research and analytics. When choosing a passive sampling method, one should not forget that some passive samplers require the time-consuming calibration step before being used in the field.
Novel solutions and modifications of existing sampler designs have been presented. Practical application of passive dosimetry in environmental analytics, including sampling of water, soil, air and other atypical media are discussed. Some aspects of calibration methods in passive dosimetry are also described. The latest trends in the application of passive sampling are highlighted.
- state of the art of passive sampling
- Passive sampling don't need pump, usually attached to the clothing
Field Evaluation of a Personal, Bioaerosol Cyclone Sampler[edit | edit source]
Janet Macher, Bean Chen & Carol Rao (2008) Field Evaluation of a Personal, Bioaerosol Cyclone Sampler, Journal of Occupational and Environmental Hygiene, 5:11, 724-734, DOI: 10.1080/15459620802400159
A personal cyclone sampler (cyclone) was operated continuously alongside a 25-mm filter sampler (filter), a slit impactor (Burkard slide), and a high-volume cyclone sampler (Burkard cyclone) at an outdoor location with abundant naturally occurring fungi (N = 30; sampling time: 12.5 ± 2.3 hr). Air concentrations (spore m-3) of 28 fungal groups were determined for all samplers by microscopy. Cyclone performance was judged using various indices to determine if it agreed with the other samplers in determination of the frequencies with which the fungal groups were observed, as well as their proportions of the total air concentration. Fungal diversity estimates were similar for all samplers and in the range of what has been reported nationally, i.e., observation of 9–11 equal groups per sample, but spore concentration dominated by 2–3 groups. Plots of paired cyclone:comparison sampler ratios against average concentrations identified biases. For example, ratios were correlated with concentration and there was greater uncertainty at lower concentrations. Mean ratios for cyclone:filter comparisons were not significantly different from one for ascospores, Aspergillus-Penicillium spp., basidiospores, Cladosporium spp., or total spore m-3. However, agreement was less consistent with the Burkard slide (0.74, 1.12, 0.91, 1.09, and 0.92, respectively) and the Burkard cyclone (2.31, 1.62, 1.43, 1.91, and 1.33, respectively). Concentrations of cell equivalent m-3 also were determined for the filter and two cyclone samples by polymerase chain reaction. Cell equivalents for Aspergillus fumigatus and Penicillium brevicompactum were compared with Aspergillus-Penicillium spp. spores, and Cladosporium cladosporioides and Cladosporium herbarum cell equivalents were compared with Cladosporium spp. spores. Cell equivalent:spore ratios below one for A. fumigatus and P. brevicompactum indicated that these species comprised smaller factions of total spores or were collected less efficiently than the larger C. cladosporioides and C. herbarum spores. The personal cyclone was shown to be suitable for collection of ambient airborne fungal spores and for analysis by microscopy and polymerase chain reaction. Keywords: cyclone sampler, fungal biodiversity, method comparison, outdoor air, sampler performance
- Personal sampling of fungi
Novel Active Personal Nanoparticle Sampler for the Exposure Assessment of Nanoparticles in Workplaces[edit | edit source]
Tsai, C.-J., Liu, C.-N., Hung, S.-M., Chen, S.-C., Uang, S.-N., Cheng, Y.-S., Zhou, Y., 2012. Novel Active Personal Nanoparticle Sampler for the Exposure Assessment of Nanoparticles in Workplaces. Environ. Sci. Technol. 46, 4546–4552. https://doi.org/10.1021/es204580f
A novel active personal nanoparticle sampler (PENS), which enables the collection of both respirable particulate mass (RPM) and nanoparticles (NPs) simultaneously, was developed to meet the critical demand for personal sampling of engineered nanomaterials (ENMs) in workplaces. The PENS consists of a respirable cyclone and a micro-orifice impactor with the cutoff aerodynamic diameter (dpa50) of 4 μm and 100 nm, respectively. The micro-orifice impactor has a fixed micro-orifice plate (137 nozzles of 55 μm in the inner diameter) and a rotating, silicone oil-coated Teflon filter substrate at 1 rpm to achieve a uniform particle deposition and avoid solid particle bounce. A final filter is used after the impactor to collect the NPs. Calibration results show that the dpa50 of the respirable cyclone and the micro-orifice impactor are 3.92 ± 0.22 μm and 101.4 ± 0.1 nm, respectively. The dpa50 at the loaded micro-Al2O3 mass of 0.36–3.18 mg is shifted to 102.9–101.2 nm, respectively, while it is shifted to 98.9–97.8 nm at the loaded nano-TiO2 mass of 0.92–1.78 mg, respectively. That is, the shift of dpa50 due to solid particle loading is small if the PENS is not overloaded.
Both NPs and RPM concentrations were found to agree well with those of the IOSH respirable cyclone and MOUDI. By using the present PENS, the collected samples can be further analyzed for chemical species concentrations besides gravimetric analysis to determine the actual exposure concentrations of ENMs in both RPM and NPs fractions in workplaces, which are often influenced by the background or incident pollution sources.
- This could be the new kind of personal sampler which could need clip-on
STERILIZATION OF FDM-MANUFACTURED PARTS[edit | edit source]
Mireya Pereza, Michael Block, David Espalina, Rob Winker, Terry Hoppe,Francisco Medina, Ryan Wicker
The University of Texas at El Paso, Stratasys Inc.
Fused Deposition Modeling (FDM) can be used to produce an array of medical devices; however, for such devices to be practical, they must be manufactured using sterilizable materials. Nine FDM materials were tested using four methods of sterilization: autoclave, ethylene oxide, hydrogen peroxide, and gamma radiation. Sterility testing was performed by incubating the samples in Tryptic Soy Broth for 14 days. The majority of the materials were sterilizable by all four methods while deformations were caused by autoclaving. Results from this research will allow medical staff to sterilize an FDM-manufactured device using a suitable method.
- ABSi, ABS-M30, ABS-M30i, ABS-ESD7, PCABS, PC, PC-ISO, PPSF, and Ultem 9085
- Five test samples and one control were used for each method of sterilization
- All but one control samples showed contamination-> unclean manufacturing process
- Sterilization works, but not all samples could handle it without deforming (Don't but ABS to the autoclave)
Experimental characterization and analytical modelling of the mechanical behaviour of fused deposition processed parts made of ABS-M30[edit | edit source]
Dario Croccolo, Massimiliano De Agostinis, Giorgio Olmi, "Experimental characterization and analytical modelling of the mechanical behaviour of fused deposition processed parts made of ABS-M30", Computational Materials Science, Vol(79): Advanced Manufacturing, 506-518, 2013. 
Abstract The Fused Deposition Modelling process is a highly efficient Rapid Prototyping approach that makes it possible to rapidly generate even much complicated parts. Unfortunately, the Fused Deposition Modelling is affected by several parameters, whose setting may have a strong impact on the components strength. This paper is devoted to the study of the effects generated by the Fused Deposition Modelling production parameters on the tensile strength and on the stiffness of the generated components, tackling the question from both the experimental and the numerical points of view. For this purpose, an analytical model was developed, which is able to predict the strength and the stiffness properties, based on the number of contours deposited around the component edge and on the setting of the other main parameters of the deposition process. The fundamental result of the paper consists in the possibility of predicting the mechanical behaviour of the Fused Deposition modelled parts, once the raster pattern (dimensions, number of contours, raster angle) has been stated. The effectiveness of the theoretical model has been verified by comparison to a significant number of experimental results, with mean errors of about 4%.
- ASTM D638-10 standard was used however stress concenteration at fillet areas led to premature failure
- New predictive version of ASTM D638-10 with a radius of 244mm was used instead
- Exp. VS Analy. models fo determining TS and E.
Indoor aerosols: from personal exposure to risk assessment[edit | edit source]
Morawska, L. , Afshari, A. , Bae, G. N., Buonanno, G. , Chao, C. Y., Hänninen, O. , Hofmann, W. , Isaxon, C. , Jayaratne, E. R., Pasanen, P. , Salthammer, T. , Waring, M. and Wierzbicka, A. (2013), Indoor aerosols: from personal exposure to risk assessment. Indoor Air, 23: 462-487.
Motivated by growing considerations of the scale, severity, and risks associated with human exposure to indoor particulate matter, this work reviewed existing literature to: (i) identify state‐of‐the‐art experimental techniques used for personal exposure assessment; (ii) compare exposure levels reported for domestic/school settings in different countries (excluding exposure to environmental tobacco smoke and particulate matter from biomass cooking in developing countries); (iii) assess the contribution of outdoor background vs indoor sources to personal exposure; and (iv) examine scientific understanding of the risks posed by personal exposure to indoor aerosols. Limited studies assessing integrated daily residential exposure to just one particle size fraction, ultrafine particles, show that the contribution of indoor sources ranged from 19% to 76%. This indicates a strong dependence on resident activities, source events and site specificity, and highlights the importance of indoor sources for total personal exposure. Further, it was assessed that 10–30% of the total burden of disease from particulate matter exposure was due to indoor‐generated particles, signifying that indoor environments are likely to be a dominant environmental factor affecting human health. However, due to challenges associated with conducting epidemiological assessments, the role of indoor‐generated particles has not been fully acknowledged, and improved exposure/risk assessment methods are still needed, together with a serious focus on exposure control.
- State of the art indoor aerosols personal exposure
EXPERIMENTAL STUDY OF MECHANICAL PROPERTIES OF ADDITIVELY MANUFACTURED ABS PLASTIC AS A FUNCTION OF LAYER PARAMETERS[edit | edit source]
Todd Letcher, Behzad Rankouhi, Sina Javadpour, "EXPERIMENTAL STUDY OF MECHANICAL PROPERTIES OF ADDITIVELY MANUFACTURED ABS PLASTIC AS A FUNCTION OF LAYER PARAMETERS", ASME 2015 International Mechanical Engineering Congress and Exposition, Volume 2A: Advanced Manufacturing, November 13–19, 2015. 
Abstract In this study, a preliminary effort was undertaken to represent the mechanical properties of a 3D printed specimen as a function of layer number, thickness and raster orientation by investigating the correlation between the mechanical properties of parts manufactured out of ABS using Fused Filament Fabrication (FFF) with a commercially available 3D printer, Makerbot Replicator 2x, and the printing parameters, such as layer thickness and raster orientation, were considered. Specimen were printed at raster orientation angles of 0°, 45° and 90°. Layer thickness of 0.2 mm was chosen to print specimens from a single layer to 35 layers. Samples were tested using an MTS Universal Testing Machine with extensometer to determine mechanical strength characteristics such as modulus of elasticity, ultimate tensile strength, maximum force and maximum elongation as the number of layers increased. Results showed that 0° raster orientation yields the highest mechanical properties compared to 45° and 90° at each individual layer. A linear relationship was found between the number of layers and the maximum force for all three orientations, in other words, maximum force required to break specimens linearly increased as the number of layers increased. The results also found the elastic modulus and maximum stress to increase as the number of layers increased up to almost 12 layers. For samples with more than 12 layers, the elastic modulus and maximum stress still increased, but at a much slower rate. These results can help software developers, mechanical designers and engineers reduce manufacturing time, material usage and cost by eliminating unnecessary layers that do not increase the ultimate stress of the material by improving material properties due to the addition of layers.
- O deg. raster orientation yields highest strength
- ASTM D638 was used however stress concenteration at fillet areas led to premature failure
- Rectangular version of ASTM D638 was used instead
Field Evaluation of Personal Sampling Methods for Multiple Bioaerosols[edit | edit source]
Wang CH, Chen BT, Han BC, Liu ACY, Hung PC, et al. (2015) Field Evaluation of Personal Sampling Methods for Multiple Bioaerosols. PLOS ONE 10(3): e0120308. 
Ambient bioaerosols are ubiquitous in the daily environment and can affect health in various ways. However, few studies have been conducted to comprehensively evaluate personal bioaerosol exposure in occupational and indoor environments because of the complex composition of bioaerosols and the lack of standardized sampling/analysis methods. We conducted a study to determine the most efficient collection/analysis method for the personal exposure assessment of multiple bioaerosols. The sampling efficiencies of three filters and four samplers were compared. According to our results, polycarbonate (PC) filters had the highest relative efficiency, particularly for bacteria. Side-by-side sampling was conducted to evaluate the three filter samplers (with PC filters) and the NIOSH Personal Bioaerosol Cyclone Sampler. According to the results, the Button Aerosol Sampler and the IOM Inhalable Dust Sampler had the highest relative efficiencies for fungi and bacteria, followed by the NIOSH sampler. Personal sampling was performed in a pig farm to assess occupational bioaerosol exposure and to evaluate the sampling/analysis methods. The Button and IOM samplers yielded a similar performance for personal bioaerosol sampling at the pig farm. However, the Button sampler is more likely to be clogged at high airborne dust concentrations because of its higher flow rate (4 L/min). Therefore, the IOM sampler is a more appropriate choice for performing personal sampling in environments with high dust levels. In summary, the Button and IOM samplers with PC filters are efficient sampling/analysis methods for the personal exposure assessment of multiple bioaerosols.
- Field tested several personal sampler, would be interesting to know what kind of attachment they used
Personal exposure monitoring of PM2.5 in indoor and outdoor microenvironments[edit | edit source]
Steinle, S., Reis, S., Sabel, C.E., Semple, S., Twigg, M.M., Braban, C.F., Leeson, S.R., Heal, M.R., Harrison, D., Lin, C., Wu, H., 2015. Personal exposure monitoring of PM2.5 in indoor and outdoor microenvironments. Science of The Total Environment 508, 383–394. https://doi.org/10.1016/j.scitotenv.2014.12.003
Adverse health effects from exposure to air pollution are a global challenge and of widespread concern. Recent high ambient concentration episodes of air pollutants in European cities highlighted the dynamic nature of human exposure and the gaps in data and knowledge about exposure patterns. In order to support health impact assessment it is essential to develop a better understanding of individual exposure pathways in people's everyday lives by taking account of all environments in which people spend time. Here we describe the development, validation and results of an exposure method applied in a study conducted in Scotland.
A low-cost particle counter based on light-scattering technology — the Dylos 1700 was used. Its performance was validated in comparison with equivalent instruments (TEOM-FDMS) at two national monitoring network sites (R2 = 0.9 at a rural background site, R2 = 0.7 at an urban background site). This validation also provided two functions to convert measured PNCs into calculated particle mass concentrations for direct comparison of concentrations with equivalent monitoring instruments and air quality limit values.
This study also used contextual and time-based activity data to define six microenvironments (MEs) to assess everyday exposure of individuals to short-term PM2.5 concentrations. The Dylos was combined with a GPS receiver to track movement and exposure of individuals across the MEs. Seventeen volunteers collected 35 profiles. Profiles may have a different overall duration and structure with respect to times spent in different MEs and activities undertaken. Results indicate that due to the substantial variability across and between MEs, it is essential to measure near-complete exposure pathways to allow for a comprehensive assessment of the exposure risk a person encounters on a daily basis. Taking into account the information gained through personal exposure measurements, this work demonstrates the added value of data generated by the application of low-cost monitors.
- Instruments attached to worker in a backpack
Failure Analysis and Mechanical Characterization of 3D Printed ABS With Respect to Layer Thickness and Orientation[edit | edit source]
Behzad Rankouhi, Sina Javadpour, Fereidoon Delfanian, Todd Letcher, "Failure Analysis and Mechanical Characterization of 3D Printed ABS With Respect to Layer Thickness and Orientation",Journal of Failure Analysis and Prevention, Vol(16), Issue 3, 467-481, 2016. 
Abstract In contrast to conventional subtractive manufacturing methods which involve removing material to reach the desired shape, additive manufacturing is the technology of making objects directly from a computer-aided design model by adding a layer of material at a time. In this study, a comprehensive effort was undertaken to represent the strength of a 3D printed object as a function of layer thickness by investigating the correlation between the mechanical properties of parts manufactured out of acrylonitrile butadiene styrene (ABS) using fused deposition modeling and layer thickness and orientation. Furthermore, a case study on a typical support frame is done to generalize the findings of the extensive experimental work done on tensile samples. Finally, fractography was performed on tensile samples via a scanning digital microscope to determine the effects of layer thickness on failure modes. Statistical analyses proved that layer thickness and raster orientation have significant effect on the mechanical properties. Tensile test results showed that samples printed with 0.2 mm layer thickness exhibit higher elastic modulus and ultimate strength compared with 0.4 mm layer thickness. These results have direct influence on decision making and future use of 3D printing and functional load bearing parts.
- No specific standard tests avaliable for parts using FDM
- ASTM D638 best choice however stress concenteration at fillet areas
- ASTM D3039 guidelines were used to prepare the samples
- 0.2 mm thickness specimen are stronger than 0.4 mm
- Smaller air gap material ratio can be main factor towards higher strength
- layer thickness and raster orientation have significant effect on material properties
Bioaerosol sampling: sampling mechanisms, bioefficiency and field studies[edit | edit source]
Haig, C.W., Mackay, W.G., Walker, J.T., Williams, C., 2016. Bioaerosol sampling: sampling mechanisms, bioefficiency and field studies. Journal of Hospital Infection 93, 242–255.
Investigations into the suspected airborne transmission of pathogens in healthcare environments have posed a challenge to researchers for more than a century. With each pathogen demonstrating a unique response to environmental conditions and the mechanical stresses it experiences, the choice of sampling device is not obvious. Our aim was to review bioaerosol sampling, sampling equipment, and methodology. A comprehensive literature search was performed, using electronic databases to retrieve English language papers on bioaerosol sampling. The review describes the mechanisms of popular bioaerosol sampling devices such as impingers, cyclones, impactors, and filters, explaining both their strengths and weaknesses, and the consequences for microbial bioefficiency. Numerous successful studies are described that point to best practice in bioaerosol sampling, from the use of small personal samplers to monitor workers' pathogen exposure through to large static samplers collecting airborne microbes in various healthcare settings. Of primary importance is the requirement that studies should commence by determining the bioefficiency of the chosen sampler and the pathogen under investigation within laboratory conditions. From such foundations, sampling for bioaerosol material in the complexity of the field holds greater certainty of successful capture of low-concentration airborne pathogens. From the laboratory to use in the field, this review enables the investigator to make informed decisions about the choice of bioaerosol sampler and its application.
Review of measurement techniques and methods for assessing personal exposure to airborne nanomaterials in workplace[edit | edit source]
Asbach, C., Alexander, C., Clavaguera, S., Dahmann, D., Dozol, H., Faure, B., Fierz, M., Fontana, L., Iavicoli, I., Kaminski, H., MacCalman, L., Meyer-Plath, A., Simonow, B., van Tongeren, M., Todea, A.M., 2017. Review of measurement techniques and methods for assessing personal exposure to airborne nanomaterials in workplaces. Science of The Total Environment 603–604, 793–806. https://doi.org/10.1016/j.scitotenv.2017.03.049
- Personal samplers and monitors are robust and ready for field-use.
- Typical accuracy of personal samplers and monitors around ± 30%
- Combination of personal sampler and monitor may be the optimal choice.
- Clear measurement strategy needed for assessing personal exposure
Exposure to airborne agents needs to be assessed in the personal breathing zone by the use of personal measurement equipment. Specific measurement devices for assessing personal exposure to airborne nanomaterials have only become available in the recent years. They can be differentiated into direct-reading personal monitors and personal samplers that collect the airborne nanomaterials for subsequent analyses. This article presents a review of the available personal monitors and samplers and summarizes the available literature regarding their accuracy, comparability and field applicability. Due to the novelty of the instruments, the number of published studies is still relatively low. Where applicable, literature data is therefore complemented with published and unpublished results from the recently finished nanoIndEx project. The presented data show that the samplers and monitors are robust and ready for field use with sufficient accuracy and comparability. However, several limitations apply, e.g. regarding the particle size range of the personal monitors and their in general lower accuracy and comparability compared with their stationary counterparts.
The decision whether a personal monitor or a personal sampler shall be preferred depends strongly on the question to tackle. In many cases, a combination of a personal monitor and a personal sampler may be the best choice to obtain conclusive results.
Mechanical properties of components fabricated with open-source 3-D printers under realistic environmental conditions[edit | edit source]
B.M. Tymrak a, M. Kreiger b, J.M. Pearce, "Mechanical properties of components fabricated with open-source 3-D printers under realistic environmental conditions", Materials and Design, Vol(58), 242-246, 2014. 
Abstract The recent development of the RepRap, an open-source self-replicating rapid prototyper, has made 3-D polymer-based printers readily available to the public at low costs ( < $500). The resultant uptake of 3-D printing technology enables for the first time mass-scale distributed digital manufacturing. RepRap variants currently fabricate objects primarily from acrylonitrile butadiene styrene (ABS) and polylactic acid (PLA), which have melting temperatures low enough to use in melt extrusion outside of a dedicated facility, while high enough for prints to retain their shape at average use temperatures. In order for RepRap printed parts to be useful for engineering applications the mechanical properties of printed parts must be known. This study quantifies the basic tensile strength and elastic modulus of printed components using realistic environmental conditions for standard users of a selection of open-source 3-D printers. The results find average tensile strengths of 28.5 MPa for ABS and 56.6 MPa for PLA with average elastic moduli of 1807 MPa for ABS and 3368 MPa for PLA. It is clear from these results that parts printed from tuned, low-cost, open-source RepRap 3-D printers can be considered as mechanically functional in tensile applications as those from commercial vendors.
- Mechanical properties of OS RepRap 3D printers
- AVG. UTS ABS: 28.5 MPa (Improvised ASTM: D638 with realistic environmental conditions of distrb. Manuf.)
- AVG. Modulus ABS: 1807 MPa (Improvised ASTM: D638 with realistic environmental conditions distrb. Manuf.)
- AVG. UTS PLA: 56.6 MPa (Improvised ASTM: D638 with realistic environmental conditions distrb. Manuf.)
- AVG. Modulus PLA: 3368 MPa (Improvised ASTM: D638 with realistic environmental conditions distrb. Manuf.)
- ABS Orientation x-y plane 0/90: highest E
- ABS Orientationx-y plane +45/-45: strongest TS
- ABS Layer thickness of 0.2mm: greatest TS
- ABS Layer thickness of 0.4mm: greatest E
Chemical Compatibility of Fused Filament Fabrication -based 3-D Printed Components with Solutions Commonly Used in Semiconductor Wet Processing[edit | edit source]
Ismo T. S. Heikkinen, Christoffer Kauppinen, Zhengjun Liu, Sanja M. Asikainen, Steven Spoljaric, Jukka V. Seppälä, Hele Savin, and Joshua M. Pearce*, "Chemical Compatibility of Fused Filament Fabrication-based 3-D Printed Components with Solutions Commonly Used in Semiconductor Wet Processing", Submitted, 2018. *
- AM polymer(10 types) parts: can be compatible for operation under concentrated chemical conditions.
- Cost reductions of over 90% with chemically resistant labware.
- ABS compatible with 7/11 (moderate to good) types of different chemical solutions (T:1 week).
- PP compatible with 11/11 (moderate to good) types of different chemical solutions (T:1 week).
Patents[edit | edit source]
personal dust sampler holder[edit | edit source]
Spring action retainers hold a particle separation cyclone and an air filter in operative position for filtering air samples drawn through an inlet aperture in the cyclone. The retainers include a fuse-type spring clip and a flat apertured retaining plate joined to the clip by coil springs. The filter and cyclone are supported by the clip at the neck of the cyclone adjacent the inlet aperture. The retaining plate, positioned over the filter, biases the cyclone and filter combination against a flange on the lower portion of the clip. A tubular connector, secured through the aperture in the retaining plate, connects with the filter on one side, and with a vacuum hose on the other side for connecting the filter outlet to the inlet of an air metering pump. The clip and several hose guides are scoured to a supporting plate which includes a pin-type fastener for attaching the sampler holder to the garment of a person in his breathing zone when collecting respirable dust samples
- Sampler attached to the clothing with safety pin
Disposable air sampling filter cassette[edit | edit source]
A composite filter unit and cassette to serve as an air sampler for personal use in connection with a metering pump and a cyclone unit. The filter unit is formed of two opposed shells with interfitting flanges to provide a support for the circumferential edges of a filter disc and to form chambers on each side of the disc, one to serve as an inlet and one to serve as an outlet. The chambers are provided with tangential openings so that inlet air is directed parallel to the disc in a toroidal path where it can flow uniformly through the filter disc to the opposed chamber and outlet. The composite filter unit is encapsulated in a cassette during use to protect it against outside contamination, the encapsulator having a special configuration for cooperation with a garment support bracket.
- Old design, where you can see how it was attached before
Personal sampling pump[edit | edit source]
"Personal sampling pumps are small battery operated vacuum pumps intended to be worn on the person to monitor the exposure of the wearer to hazardous atmospheric conditions."
Cyclone personal sampler for aerosols[edit | edit source]
"The present invention relates to a personal sampler, that is one which is of sufficiently small size so that it can be worn by a user to determine the quality of air being respirated, which utilizes a two-stage cyclone evaluator that includes a conventional elongated personal cyclone separator that has a lower cut-off size of in the range of 10 microns."
Universal backpack harness[edit | edit source]
- Harness design
Personal particle monitor[edit | edit source]
Provided is a personal sampler for PM that allows separation of airborne particles in several size ranges and operates at a high flow rate (9 L/min) by personal sampling standards that makes chemical analysis of the size-fractionated particles possible within a period of 24 hours or less
- This could totally use univeral clip-on design
Harness for firearm accessories[edit | edit source]
- Harness design
- also includes gun attached to the harness with a clip-on
Compact aerosol sampler[edit | edit source]
Provided is an aerosol collector of reduced size having an aerosol inlet, an impactor plate containing several particle size-selecting nozzles therethrough, a replaceable collection layer and a fan having a power supply such as a battery pack, all of which fits a small container, attachable to, e.g., the lapel of the user, means to rotate the fan and move the aerosol through the sampler, so as to draw airborne particles through the inlet and through one or more nozzles, to impact the particles on the layer for analysis of same.
- Attachment to the clothing
Personal nanoparticle respiratory depositions sampler and methods of using the same[edit | edit source]
A personally portable nanoparticle respiratory deposition (NRD) sampler configured to collect nanoparticles based upon a sampling criterion. In an aspect, the NRD sampler has an impactor stage, and a diffusion stage. In another aspect, the NRD sampler includes a particle size separator in addition to an impactor stage and a diffusion stage.
Guidelines and Data Sheets[edit | edit source]
Standard Test Method for Tensile Properties of Plastics[edit | edit source]
ASTM D638-14, Standard Test Method for Tensile Properties of Plastics, ASTM International, West Conshohocken, PA, 2014 
This test method is designed to produce tensile property data for the control and specification of plastic materials. These data are also useful for qualitative characterization and for research and development.
Standard Guide for Air Sampling Strategies for Worker and Workplace Protection[edit | edit source]
ASTM E1370-14, Standard Guide for Air Sampling Strategies for Worker and Workplace Protection, ASTM International, West Conshohocken, PA, 2014, www.astm.org
Standard Test Method for Respirable Dust in Workplace Atmospheres Using Cyclone Samplers[edit | edit source]
ASTM D4532-15, Standard Test Method for Respirable Dust in Workplace Atmospheres Using Cyclone Samplers, ASTM International, West Conshohocken, PA, 2015, www.astm.org DOI: 10.1520/D4532-15
ISO/ASTM 52900:2015[edit | edit source]
Additive manufacturing -- General principles -- Terminology
ISO/ASTM 52900:2015 establishes and defines terms used in additive manufacturing (AM) technology, which applies the additive shaping principle and thereby builds physical 3D geometries by successive addition of material. The terms have been classified into specific fields of application.
- ISO/ASTM approved AM methods and definitions
Safety Data Sheet[edit | edit source]
Stratasys Direct, Inc., "Safety Data Sheet", 2015.
Safety Data Sheet for ABS-M30/P430 ABS/P430XL ABS/ABSplus Model Material
- Not dangerous according to (REGULATION (EC) No 1272/2008)
- Eye contact: rinse
- Extinguishing Media: water, dry powder, foam, CO2
- Keep tightly closed in a dry and cool place.
- Does not contain any hazardous materials with occupational exposure limits established by the region specific regulatory bodies.
- Contains no substances known to be hazardous to the environment or that are not degradable in waste water treatment plants.
- Handle in accordance with good industrial hygiene and safety practice.
- No protective equipment is needed under normal use conditions.
Fused Deposition Modeling (FDM) Design Guidelines[edit | edit source]
Stratasys Direct, Inc., "Fused Deposition Modeling (FDM) Design Guidelines", 2015.
Part Design For FDM
These guidelines are to be used as a starting point in understanding the basic aspects of part design and preparation for FDM components. When designing a part to be built using FDM technology, build process must be considered. FDM is accomplished by extruding thin layers of molten thermoplastic layer by layer until a part is produced. Because FDM produces parts with specific characteristics and capabilities different from those of other prototyping processes, the systems have become increasingly used as a tool for producing manufactured products.
- FDM Design considerations according to uPrint SE Pro
ISO / ASTM52910-17, Standard Guidelines for Design for Additive Manufacturing[edit | edit source]
ISO / ASTM52910-17, Standard Guidelines for Design for Additive Manufacturing , ASTM International, West Conshohocken, PA, 2016, www.astm.org
ABSplus-P430: Production-Grade Thermoplastic for 3D Printers[edit | edit source]
Stratasys Direct, Inc., "ABSplus-P430: Production-Grade Thermoplastic for 3D Printers", 2017.
Mechanical properties of ABS plus (natural)
- UTS:33MPa (ASTM D638)
- YTS: 31MPa (ASTM D638)
- Tensile Modulus: 2200 MPa (ASTM D638)
- Toughness: 106 J/m (ASTM D638)
- Hardness: 109.5 (ASTM D785)
- Thermal Properties of ABS plus (ASTM D648)
- Electrical Properties of ABS plus (ASTM D257, D150-98 and D149-09)
Standard Test Method for Tensile Properties of Polymer Matrix Composite Materials[edit | edit source]
ASTM D3039 / D3039M-17, Standard Test Method for Tensile Properties of Polymer Matrix Composite Materials, ASTM International, West Conshohocken, PA, 2017 
This test method is designed to produce tensile property data for material specifications, research and development, quality assurance, and structural design and analysis. Factors that influence the tensile response and should therefore be reported include the following: material, methods of material preparation and lay-up, specimen stacking sequence, specimen preparation, specimen conditioning, environment of testing, specimen alignment and gripping, speed of testing, time at temperature, void content, and volume percent reinforcement.
Personal Sampling for Air Contaminants[edit | edit source]
Software[edit | edit source]
FreeCad[edit | edit source]
Original Authors: Jürgen Riegel, Werner Mayer, Yorik van Havre, "FreeCad", 2018 
FreeCAD is a parametric 3D modeler made primarily to design real-life objects of any size. Parametric modeling allows you to easily modify your design by going back into your model history and changing its parameters. FreeCAD is open-source and highly customizable, scriptable and extensible.
- Used for modeling
- The bug fix release 0.17.13519 was published 2018-04-23
Netfabb[edit | edit source]
Autodesk Inc., "Netfabb", 2018 
Netfabb brings additive design and manufacturing tools together in a single software environment, giving product designers and engineers all the tools they need to optimize, validate and successfully produce models using additive manufacturing processes.
- Used for STL repair
- Free for Students and Educators