title: Surface sliding friction of negatively charged polyelectrolyte gels.
abstract: The friction between two polyelectrolyte gels carrying the same or opposite sign of charges has been investigated using a rheometer. It is found that the friction was strongly dependent on the interfacial interaction between two gel surfaces. In the repulsive interaction case, especially, the friction was extremely low. The friction behavior is attempted to be described in terms of the hydrodynamic lubrication of the solvent layer between two like-charged gel surfaces, which is formed due to the electrostatic repulsion of the two gel surfaces. From the theoretical analysis (hydrodynamic mechanism), the friction behaviors were explained qualitatively, all of the experimental results, nevertheless, could not be understood well. The viscoelastic feature of the gel and the non-Newtonian behavior of water at the friction interface are considered to be important to elucidate the gel friction.
authors.affiliation: Creative Research Initiative SOUSEI, Hokkaido University, Sapporo 001-0021, Japan.
authors.forename: Go
authors.initials: G
authors.lastname: Kagata
authors.forename: Jian Ping
authors.initials: JP
authors.lastname: Gong
mesh_terms: D000178:Acrylamides / Q000737:chemistry; D000476:Alkanesulfonates / Q000737:chemistry; D003432:Cross-Linking Reagents / Q000737:chemistry; D004573:Electrolytes / Q000737:chemistry*; D017276:Friction; D005782:Gels / Q000737:chemistry*; D011108:Polymers / Q000138:chemical synthesis* / Q000737:chemistry; D033081:Shear Strength; D013451:Sulfonic Acids / Q000138:chemical synthesis* / Q000737:chemistry; D013499:Surface Properties; D013997:Time Factors; D014867:Water / Q000737:chemistry
chemical_list: D000178:Acrylamides; D000476:Alkanesulfonates; D003432:Cross-Linking Reagents; D004573:Electrolytes; D005782:Gels; D011108:Polymers; D013451:Sulfonic Acids; D014867:Water; C077118:poly(2-acrylamido-2-methyl-1-propanesulfonic acid); C056288:2-acrylamido-2-methylpropanesulfonate; C021221:N,N'-methylenebisacrylamide