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Courtesy of Alzet Osmotic Pumps Pharmaceutics  Cancer Treatments  Painkillers Agriculture  Fertilization of crops Fragrances  Air freshener  Bug.

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Presentation on theme: "Courtesy of Alzet Osmotic Pumps Pharmaceutics  Cancer Treatments  Painkillers Agriculture  Fertilization of crops Fragrances  Air freshener  Bug."— Presentation transcript:

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3 Courtesy of Alzet Osmotic Pumps Pharmaceutics  Cancer Treatments  Painkillers Agriculture  Fertilization of crops Fragrances  Air freshener  Bug repellant

4 #1: Semi-permeable membranes and controlled concentrations can create a zero-order rate of diffusion. #2: Polar membranes diffuse polar substances like alcohols at a zero- order rate.

5 J = mass flux D = diffusion co- efficient dC = C IN - C OUT dX = thickness of membrane

6 (Ra) 2 = 4(δ D1 -δ D2 ) 2 + (δ P1 -δ P2 ) 2 + (δ H1 - δ H2 ) 2 RED = Ra/Ro δ D = London dispersion forces δ P = Dipole-dipole interactions δ H = Hydrogen bonding Ra = Solubility difference Ro = Solubility radius RED = Relative energy difference

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11 Courtesy of Vernier Software & Technology

12 Citric AcidAscorbic Acid Acetylsalicylic Acid g/100 mL33.O g/100 mL0.30 g/100 mL

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