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==Background== | ==Background== | ||
There is a method of solar water disinfection (SODIS) that lets water be naturally heated by the sun's rays over a period of about six hours. When the amount of UV radiation has peaked, then the water is safe to drink. The water container is a recycled plastic water bottle, which is what makes this method so cheap. However, this is the least efficient method of solar water disinfection. | There is a method of solar water disinfection (SODIS) that lets water be naturally heated by the sun's rays over a period of about six hours. When the amount of UV radiation has peaked, then the water is safe to drink. The water container is a recycled plastic water bottle, which is what makes this method so cheap. However, this is the least efficient method of solar water disinfection. | ||
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*UV filter | *UV filter | ||
*Solar simulator | *Solar simulator | ||
**[ | **[https://www.appropedia.org/Dr._Hu_solar_simulator_protocol:_MOST Dr. Hu solar sim protocol] | ||
==Procedure== | ==Procedure== | ||
The solar simulator is approximately 1 kW/sq meter when the sample is | The solar simulator is approximately 1 kW/sq meter when the sample is 35-40 centimeters away from the front of the lense of the solar simulator. Combine the gaphchromic polymer with the UV filter and sunscreen, and then leave the sample 35-40 centimeters away from the front of the lense. Take samples from the gaphchromic polymer every ten minutes for 6 hours. | ||
===Applying Sun Screen Layer=== | ===Applying Sun Screen Layer=== | ||
*Dissolve sunscreen in acetonitrile (ACN) | *Dissolve sunscreen in acetonitrile (ACN) | ||
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*Collect superatant (This is solution that will be sprayed onto gaphchromic) | *Collect superatant (This is solution that will be sprayed onto gaphchromic) | ||
*Spray even, thin coat of ACN onto film, solvent dries leaving sunscreen | *Spray even, thin coat of ACN onto film, solvent dries leaving sunscreen | ||
Suggestion: | |||
*Spray single film w/ gradient of different ACN/sunscreen components and expose to 1,000 W/sq meter to identify concentration. (need to appropriately attenuate energy/color change) | *Spray single film w/ gradient of different ACN/sunscreen components and expose to 1,000 W/sq meter to identify concentration. (need to appropriately attenuate energy/color change) | ||
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Latest revision as of 15:41, 2 March 2022
Background[edit | edit source]
There is a method of solar water disinfection (SODIS) that lets water be naturally heated by the sun's rays over a period of about six hours. When the amount of UV radiation has peaked, then the water is safe to drink. The water container is a recycled plastic water bottle, which is what makes this method so cheap. However, this is the least efficient method of solar water disinfection.
Purpose[edit | edit source]
Experimental research on the gaphchromic polymer will allow us to fabricate a polymer that will change color when the bottle has recieved the allowable amount of UV radiation that indicates pasteurization.
Materials[edit | edit source]
- Gaphchromic polymer
- UV retardant (sunscreen)
- UV filter
- Solar simulator
Procedure[edit | edit source]
The solar simulator is approximately 1 kW/sq meter when the sample is 35-40 centimeters away from the front of the lense of the solar simulator. Combine the gaphchromic polymer with the UV filter and sunscreen, and then leave the sample 35-40 centimeters away from the front of the lense. Take samples from the gaphchromic polymer every ten minutes for 6 hours.
Applying Sun Screen Layer[edit | edit source]
- Dissolve sunscreen in acetonitrile (ACN)
- Centrifuge to remove TiO2 Particles
- Collect superatant (This is solution that will be sprayed onto gaphchromic)
- Spray even, thin coat of ACN onto film, solvent dries leaving sunscreen
Suggestion:
- Spray single film w/ gradient of different ACN/sunscreen components and expose to 1,000 W/sq meter to identify concentration. (need to appropriately attenuate energy/color change)