title: A novel approach for preparation of micrometer-sized, monodisperse dimple and hemispherical polystyrene particles.
abstract: Micrometer-sized, monodisperse dimple and hemispherical polystyrene (PS) particles were successfully prepared by heating (55-70 degrees C) of spherical PS particles dispersed in methanol/water media (40/60 to 80/20, w/w) in the presence of decane droplets, and subsequent cooling down to room temperature. Decane was absorbed by the PS particles during the heating process. Decane-absorbed PS particles phase-separated into PS and decane phases in the inside during the cooling process, and eventually dimple and/or hemispherical particles were formed by removal of the decane phase from phase-separated PS/decane particles by evaporation. The size of the dimple, which is determined by the volume of decane phase-separated from decane-absorbed PS particles during the cooling process, increased with increases in the heating temperature and the methanol content.
authors.affiliation: Graduate School of Engineering, Kobe University, Kobe 657-8501, Japan.
authors.forename: Takuya
authors.initials: T
authors.lastname: Tanaka
authors.forename: Yoshifumi
authors.initials: Y
authors.lastname: Komatsu
authors.forename: Teruhisa
authors.initials: T
authors.lastname: Fujibayashi
authors.forename: Hideto
authors.initials: H
authors.lastname: Minami
authors.forename: Masayoshi
authors.initials: M
authors.lastname: Okubo