TY - JOUR
T1 - Millimeter-sized capsules prepared using liquid marbles
T2 - Encapsulation of ingredients with high efficiency and preparation of spherical core-shell capsules with highly uniform shell thickness using centrifugal force
AU - Takei, Takayuki
AU - Yamasaki, Yumiko
AU - Yuji, Yudai
AU - Sakoguchi, Shogo
AU - Ohzuno, Yoshihiro
AU - Hayase, Gen
AU - Yoshida, Masahiro
N1 - Funding Information:
This research was partially supported by a Grant-in-Aid for Scientific Research (C) (18K04815, 2018), from the Japan Society for the Promotion of Science (JSPS). We thank Forte Inc. for editing a draft of this manuscript.
Funding Information:
This research was partially supported by a Grant-in-Aid for Scientific Research (C) ( 18K04815, 2018 ), from the Japan Society for the Promotion of Science (JSPS). We thank Forte Inc. for editing a draft of this manuscript.
Publisher Copyright:
© 2018 Elsevier Inc.
PY - 2019/2/15
Y1 - 2019/2/15
N2 - Hypothesis: In our previous study, we prepared millimeter-sized spherical hard capsules by solidifying droplets of liquid monomer or polymer solution placed on superamphiphobic surface. Application of liquid marbles in place of the naked droplets for capsule preparation has a great potential to increase encapsulation efficiency of high volatile ingredients. Further, interfacial thermodynamic prediction of internal configuration of capsules from spreading coefficients may be effective to prepare core/shell capsule. Experiments: Droplets of liquid monomer containing a volatile ingredient were rolled on superamphiphobic powders to prepare liquid marbles and solidified by photopolymerization. For preparation of core/shell capsules, the liquid marbles injected with an immiscible water droplet were also solidified. Findings: A volatile ingredient could be encapsulated with higher efficiency than our previous method. Interfacial thermodynamic prediction of internal configuration of capsules from spreading coefficients indicated successful formation of core/shell capsules. However, photopolymerization of the liquid marbles in a static condition resulted in formation of not only core/shell capsules but also acorn-type capsules. Furthermore, the core/shell capsules were distorted and the shell thickness was not uniform. Rolling of the liquid marbles, which generated centrifugal force inside of the liquid marbles, was effective to prepare spherical capsules with highly uniform shell thickness.
AB - Hypothesis: In our previous study, we prepared millimeter-sized spherical hard capsules by solidifying droplets of liquid monomer or polymer solution placed on superamphiphobic surface. Application of liquid marbles in place of the naked droplets for capsule preparation has a great potential to increase encapsulation efficiency of high volatile ingredients. Further, interfacial thermodynamic prediction of internal configuration of capsules from spreading coefficients may be effective to prepare core/shell capsule. Experiments: Droplets of liquid monomer containing a volatile ingredient were rolled on superamphiphobic powders to prepare liquid marbles and solidified by photopolymerization. For preparation of core/shell capsules, the liquid marbles injected with an immiscible water droplet were also solidified. Findings: A volatile ingredient could be encapsulated with higher efficiency than our previous method. Interfacial thermodynamic prediction of internal configuration of capsules from spreading coefficients indicated successful formation of core/shell capsules. However, photopolymerization of the liquid marbles in a static condition resulted in formation of not only core/shell capsules but also acorn-type capsules. Furthermore, the core/shell capsules were distorted and the shell thickness was not uniform. Rolling of the liquid marbles, which generated centrifugal force inside of the liquid marbles, was effective to prepare spherical capsules with highly uniform shell thickness.
KW - Capsule
KW - Centrifugal force
KW - Encapsulation efficiency
KW - Liquid marble
KW - Spreading coefficient
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U2 - 10.1016/j.jcis.2018.10.058
DO - 10.1016/j.jcis.2018.10.058
M3 - Article
C2 - 30380441
AN - SCOPUS:85055533463
VL - 536
SP - 414
EP - 423
JO - Journal of Colloid and Interface Science
JF - Journal of Colloid and Interface Science
SN - 0021-9797
ER -