title: Temperature-dependent gelation process in colloidal dispersions by diffusing wave spectroscopy.
abstract: Temperature-dependent microrheology of a concentrated charge-stabilized poly(methyl methacrylate) colloidal dispersion with different salt concentrations was investigated by diffusing wave spectroscopy in backscattering mode. The critical temperature where the system undergoes aggregation and gelation depends upon the particle volume fraction or salt concentration. The viscoelastic properties of the systems have been discussed using Maxwell and Kelvin-Voigt models. Temperature-dependent crossover (G' = G″) frequency has been used to calculate activation energies representing a critical energy of interaction of gel formation.
authors.affiliation: State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, University of Chinese Academy of Sciences , Renmin Street 5625, 130022 Changchun, People's Republic of China.
authors.forename: Jiaxue
authors.initials: J
authors.lastname: Liu
authors.forename: Volodymyr
authors.initials: V
authors.lastname: Boyko
authors.forename: Zhiyong
authors.initials: Z
authors.lastname: Yi
authors.forename: Yongfeng
authors.initials: Y
authors.lastname: Men