TITLE:
Preparation of Microcapsules with Liquid Droplet Coalescence Method Followed by Phase Separation
AUTHORS:
Yasushi Yokoyama, Kiyomi Fuchigami, Yoshinari Taguchi, Masato Tanaka
KEYWORDS:
Core Shell Microcapsule; Liquid Droplet Coalescence Method; Phase Separation; Limonene Oil; Liquid-Liquid Dispersion
JOURNAL NAME:
Journal of Encapsulation and Adsorption Sciences,
Vol.3 No.3,
September
24,
2013
ABSTRACT: Novel preparation method of microencapsules was
developed on the basis of the liquid coalescence method followed by phase
separation. Oil droplets of limonene dissolving expanded polystyrene as a shell
material were forced to collide and coalesce with the Isopar oil droplets of
core material in the continuous wates phase. When two kinds of oil droplets are
collided and coalesced with each other, expanded polystyrene dissolved in the
limonene oil may be phase-separated in the oil droplets newly formed to form
the microcapsule shell, because the Isopar oil was a poor solvent for expanded
polystyrene but a good solvent for the limonene oil. In the experiment,
the diameter (or number) of limonene oil droplets dissolving expanded
polystyrene was mainly changed, because the coalescence frequency between the
droplets is strongly dependent on the number of droplets. Favorable
core shell types of microcapsules with the shell thickness from 1.0 to 5.0 μm were
able to be prepared under all the experimental conditions adopted here.