title: Autonomously oscillating viscosity in microgel dispersions.
abstract: We present autonomously oscillating viscosity in microgel dispersions. The microgels were obtained by introducing the Ru catalyst for the Belousov-Zhabotinsky (BZ) reaction into a cross-linked copolymer. In this microgel system, the chemical energy of the BZ reaction is converted to rhythmic swelling/deswelling oscillation of the microgels. Moreover, self-flocculating/self-dispersing oscillation of the microgels occurs near its phase transition temperature. Through the use of these two oscillations of the microgels, a new function of colloidal dispersions has been discovered, namely, autonomously oscillating viscosity in a microgel dispersion. The viscosity in the dispersion oscillated autonomously, following the swelling/deswelling and self-flocculation/self-dispersion oscillations of the microgels. As a result, we can control the rhythm and amplitude of the oscillation using these two phenomena of the microgels.
authors.affiliation: International Young Researchers Empowerment Center, Shinshu University, 3-15-1 Tokida, Ueda, Nagano 386-8567, Japan. d_suzuki@shinshu-u.ac.jp
authors.forename: Daisuke
authors.initials: D
authors.lastname: Suzuki
authors.forename: Hajime
authors.initials: H
authors.lastname: Taniguchi
authors.forename: Ryo
authors.initials: R
authors.lastname: Yoshida
mesh_terms: D011232:Chemical Precipitation; D005782:Gels / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry; D012212:Rheology; D013696:Temperature; D014783:Viscosity; D014867:Water / Q000737:chemistry
chemical_list: D005782:Gels; D011108:Polymers; D014867:Water