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Kaolinite-armoured polyurea microcapsules fabricated on Pickering emulsion: controllable encapsulation and release performance of a lipophilic compound

Published online by Cambridge University Press:  16 April 2021

Cunjun Li Open the ORCID record for Cunjun Li [Opens in a new window] ,
Minghao Wang ,
Zhaoliang Liu ,
Yanqi Xu ,
Chunhui Zhou  and
Linjiang Wang
Cunjun Li*
Affiliation:
College of Materials Science and Engineering, Guilin University of Technology, Guilin541004, China Engineering Research Center of Biochar of Zhejiang Province, Hangzhou310021, China Research Group for Advanced Materials & Sustainable Catalysis (AMSC), College of Chemical Engineering, Zhejiang University of Technology, Hangzhou310032, China
Minghao Wang
Affiliation:
College of Materials Science and Engineering, Guilin University of Technology, Guilin541004, China
Zhaoliang Liu
Affiliation:
College of Materials Science and Engineering, Guilin University of Technology, Guilin541004, China
Yanqi Xu
Affiliation:
College of Materials Science and Engineering, Guilin University of Technology, Guilin541004, China Key Lab of New Processing Technology for Nonferrous Metals and Materials Ministry of Education, Guilin541004, China Guangxi Beibu Gulf Engineering Research Center for Green Marine Material, Guilin54100, China
Chunhui Zhou
Affiliation:
Research Group for Advanced Materials & Sustainable Catalysis (AMSC), College of Chemical Engineering, Zhejiang University of Technology, Hangzhou310032, China
Linjiang Wang*
Affiliation:
College of Materials Science and Engineering, Guilin University of Technology, Guilin541004, China Key Lab of New Processing Technology for Nonferrous Metals and Materials Ministry of Education, Guilin541004, China Guangxi Beibu Gulf Engineering Research Center for Green Marine Material, Guilin54100, China
*
*Email: [email protected] (C Li); [email protected] (L Wang)
*Email: [email protected] (C Li); [email protected] (L Wang)
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Abstract

Microcapsules are successfully used in various applications such as self-healing, drug delivery and military camouflage. The shells of the microcapsules based on the traditional surfactant-stabilized emulsion template method are often single organic materials. The surfactants generally have insufficient stability against demulsification during preparation of the microcapsules. In the present study, kaolinite was used as an emulsifier for stabilizing Pickering emulsions and subsequently as an enhancer for forming microcapsules. Kaolinite-armoured polyurea microcapsules were fabricated based on the interfacial polymerization of isophorone diisocyanate at the oil–water interfaces of kaolinite-stabilized Pickering emulsions. The prepared microcapsules with core–shell structure were spherical and exhibited good dispersibility in anhydrous ethanol. The shell thickness (~0.5–1.0 μm) and diameter (~20.0–160.0 μm) of kaolinite-armoured polyurea microcapsules may be tailored by varying the dosages of isophorone diisocyanate and kaolinite and the emulsifying speed of the high-shear homogenizer. Hence, the encapsulation and release performance of microcapsules may be controlled. The kaolinite particles were embedded and armoured in a polyurea matrix. The formed kaolinite-embedded and -armoured polyurea structures might prolong the release of the encapsulated lipophilic Sudan Red (III) from 20 to 45 h. The microcapsules have controllable encapsulation and release characteristics for lipophilic compounds and are cost effective, making them suitable pesticides.

Keywords

emulsioninterfacial polymerizationkaolinitemicrocapsulepolyurea
Type
Article
Information
Clay Minerals , Volume 56 , Issue 1 , March 2021 , pp. 46 - 54
Copyright
Copyright © The Author(s), 2021. Published by Cambridge University Press on behalf of The Mineralogical Society of Great Britain and Ireland

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Footnotes

‡

These two authors contributed equally to this work.

Associate Editor: Margarita Darder

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