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]

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


  • 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)

Discussion[View | Edit]

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