title: Colloidal crystallization of colloidal silica modified with ferrocenyl group-contained polymers in organic solvents.
abstract: Surface modification of colloidal silica with ferrocenyl-grafted polymer and colloidal crystallization of the particles in organic solvent were studied. Poly(methyl methacrylate-co-vinylferrocene)-grafted silica never formed colloidal crystals in polar solvent, such as acetone, acetonitrile, ethanol and N,N-dimethylformamide (DMF), while poly(methyl methacrylate-co-ferrocenyl acrylate)-grafted silica gave colloidal crystallization in DMF. The particles prepared by grafting of poly(N,N-dimethylacrylamide-co-vinylferrocene), with vinylferrocene (Vfc) mole fraction of 1/13 and 1/23, were observed to give the crystallization in ethanol and DMF over particle volume fraction of 0.058. Further, silica modified with copolymer of Vfc and N-vinyl-2-pyrrolidone, N-vinylcarbazole or N-isopropylacrylamide formed colloidal crystals in ethanol and DMF. Especially, poly(N-isopropylacrylamide-co-Vfc)-grafted silica, which was composed of the highest mole fraction of vinylferrocene, 1/3, afforded colloidal crystallization in ethanol over particle volume fraction of 0.053. Relatively high polar vinylferrocene copolymer grafting of silica resulted in colloidal polymerization in organic solvents.
authors.affiliation: Department of Applied Chemistry, Faculty of Engineering, Kyushu Institute of Technology, 1-1 Sensui, Tobata, Kitakyushu, Fukuoka 804-8550, Japan. khyosina@che.kyutech.ac.jp
authors.forename: Kohji
authors.initials: K
authors.lastname: Yoshinaga
authors.forename: Maki
authors.initials: M
authors.lastname: Shigeta
authors.forename: Seishu
authors.initials: S
authors.lastname: Komune
authors.forename: Emiko
authors.initials: E
authors.lastname: Mouri
authors.forename: Akemi
authors.initials: A
authors.lastname: Nakai
mesh_terms: D000577:Amides / Q000737:chemistry; D003102:Colloids; D003460:Crystallization; D005296:Ferrous Compounds / Q000737:chemistry*; D000075163:Metallocenes; D015394:Molecular Structure; D011108:Polymers / Q000737:chemistry*; D012821:Silanes / Q000737:chemistry; D012822:Silicon Dioxide / Q000737:chemistry*; D012997:Solvents / Q000737:chemistry*
chemical_list: D000577:Amides; D003102:Colloids; D005296:Ferrous Compounds; D000075163:Metallocenes; D011108:Polymers; D012821:Silanes; D012997:Solvents; D012822:Silicon Dioxide; C004998:ferrocene