TY - GEN
T1 - Release behavior of W/O/W-type microcapsule
AU - Uehara, Masumi
AU - Yoshinaga, Yuuka
AU - Ogawa, Tomohiro
AU - Maki, Yasuyuki
AU - Takeno, Hiroyuki
AU - Yamamoto, Takao
AU - Ichikawa, Kimio
AU - Dobashi, Toshiaki
N1 - Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2012
Y1 - 2012
N2 - We have prepared W/O/W-type microcapsules with polyureaurethane wall membrane and aqueous core containing methylene blue by means of the double emulsification method and the effect of the rate of agitation at the twice emulsification on the release of methylene blue to dispersing methanol was examined. The release curve was expressed fairly well by the streched exponential form: (Equation presented) where C(t) and Ceq are the concentrations of methylene blue in the dispersing methanol at time t and at the equilibrium state, respectively. The time constant τ increased and the exponent α decreased with increasing the rate of agitation at the second emulsification, whereas τ decreased and α was constant with increasing the rate of agitation at the first emulsification. These differences are discussed from a viewpoint of inhomogeneity of the microcapsule wall membrane.
AB - We have prepared W/O/W-type microcapsules with polyureaurethane wall membrane and aqueous core containing methylene blue by means of the double emulsification method and the effect of the rate of agitation at the twice emulsification on the release of methylene blue to dispersing methanol was examined. The release curve was expressed fairly well by the streched exponential form: (Equation presented) where C(t) and Ceq are the concentrations of methylene blue in the dispersing methanol at time t and at the equilibrium state, respectively. The time constant τ increased and the exponent α decreased with increasing the rate of agitation at the second emulsification, whereas τ decreased and α was constant with increasing the rate of agitation at the first emulsification. These differences are discussed from a viewpoint of inhomogeneity of the microcapsule wall membrane.
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U2 - 10.4028/www.scientific.net/KEM.497.55
DO - 10.4028/www.scientific.net/KEM.497.55
M3 - Conference contribution
AN - SCOPUS:84862971536
SN - 9783037852859
T3 - Key Engineering Materials
SP - 55
EP - 60
BT - Silicon Science and Advanced Micro-Device Engineering II
PB - Trans Tech Publications Ltd
T2 - 6th International Symposium on Silicon Science and 2nd International Conference on Advanced Micro-Device Engineering, ISSS and AMDE 2010
Y2 - 9 December 2010 through 10 December 2010
ER -