Author(s)

Kenji Mishima, Haruo Yokota, Takafumi Kato, Tadashi Suetsugu, Xiuqin Wei, Keiichi Irie, Kenichi Mishima, Michihiro Fujiwara

Department of Chemical Engineering,Fukuoka University, 8-19-1 Nanakuma Jonan-ku, Fukuoka 814-0180, Japan.
Department of Chemical EngineeringFukuoka University, 8-19-1 Nanakuma Jonan-ku, Fukuoka 814-0180, Japan.
Department of Electronics Engineering and Computer Science, Fukuoka University, 8-19-1 Nanakuma Jonan-ku, Fukuoka 814-0180, Japan.
Department of Electronics Engineering and Computer ScienceFukuoka University, 8-19-1 Nanakuma Jonan-ku, Fukuoka 814-0180, Japan.
Department of Neuropharmacology, Fukuoka University, 8-19-1 Nanakuma Jonan-ku, Fukuoka 814-0180, Japan.

 We report a method for the coacervation micro-encapsulation of several forms of CaCO₃ microparticles with the fluoropolymer poly(heptadecafluorodecyl acrylate) (poly (HDFDA)) by pressure-induced phase separation of a supercritical CO₂ solution.  A suspension of CaCO₃ in CO₂ and dissolved poly(HDFDA) were mixed in supercritical CO₂.  After the system pressure was slowly decreased to atmospheric pressure, the microcapsules were obtained.  Coacervation was achieved by the precipitation of poly(HDFDA) during the decrease in the pressure of CO₂; the solubility of poly(HDFDA) in CO₂ decreased with the pressure.  The structure and morphology of the microparticles were investigated by using a scanning electron microscope (SEM) and an electron probe microanalyzer (EPMA) equipped with a wavelength dispersive X-ray spectroscope (WDX).

Component; Supercritical Carbon Dioxide; Microencapsulation; Coacervation; Fluoropolymer; Calcium Carbonate

K. Mishima, H. Yokota, T. Kato, T. Suetsugu, X. Wei, K. Irie, K. Mishima and M. Fujiwara, "Coacervation Microencapsulation of CaCO₃ Particles with a Fluoropolymer by Pressure-induced Phase Separation of Supercritical Carbon Dioxide Solutions," Advances in Materials Physics and Chemistry, Vol. 2 No. 4B, 2012, pp. 181-184. doi: 10.4236/ampc.2012.24B047.