Friction of gels. 5. negative load dependence of polysaccharide gels

Article Abstract:

Research is presented describing the methods used to observe polysaccharide gels and their negative load dependency.

Observations, Chemistry, Physical and theoretical, Physical chemistry, Polysaccharides, Skin friction (Fluid dynamics)

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Influence of shear stress on cationic surfactant uptake by anionic gels

Article Abstract:

Kinetic studies of cationic surfactant uptake by anionic polymer gel membrane under various shear flow are conducted, varying the alkyl chain length of surfactant, the ionic strength of surfactant solution, and the charge density of gel. A linear relationship between the surfactant initial flux and shear stress is shown.

United States, Surface active agents, Surface Active Agent Manufacturing, Anionic Surfactants, Cationic Surfactants, Analysis, Influence, Polymers, Matter, Kinetic theory of, Kinetic theory, Stress corrosion

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Friction on solid surfaces

Article Abstract:

The frictional behavior of various types of hydrogels sliding on glass plates and Teflon plates in both air and water were investigated. These hydrogels are poly(vinyl alcohol) gel, gellan gel, poly(2-acrylamido-2methylpropanesulfonic acid) gel and its sodium salt gel. Results showed that the frictional force and its dependencies depend upon the chemical structures of the gels, surface properties of the opposing substrates and the measurement condition.

Colloids, Friction

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