Permeability and diffusivity for water transport through hydrogel membranes

摘要: Abstract Water transport through soft contact lenses is important to their behavior on the human eye. For first time, we report gradient-driven diffusion rates of water HEMA hydrogel membranes prototypical commercial lenses. evaporated from one surface membrane into known relative humidity air, and weight loss a reservoir at other followed in time. Typical permeabilities are around 1–5 cm/s, increasing with saturated content membrane. Binary Fickian coefficients near 10−7 cm2/s. We also garner binary Stefan–Maxwell based Flory–Rehner theory for polymer solutions. useful because, general, they depend less strongly concentration, can be readily incorporated multicomponent though membranes. Both increase somewhat initial individual lens materials.