Sustained release insect repellent microcapsules using modified cellulose nanofibers (mCNF) as pickering emulsifier

[Display omitted] We report here an approach to encapsulate N, N-diethyl-3-methylbenzamide (DEET), an insect repellent, through interfacial polycondensation using modified cellulose nanofiber (CNF) as pickering emulsifier. We found that stearic acid functionalized CNF (mCNF) can be used to form stab...

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Published inColloids and surfaces. A, Physicochemical and engineering aspects Vol. 582; p. 123883
Main Authors Kadam, Sandip L., Yadav, Prashant, Bhutkar, Siddhant, Patil, Vishal D., Shukla, Parshuram G., Shanmuganathan, Kadhiravan
Format Journal Article
LanguageEnglish
Published Elsevier B.V 05.12.2019
Subjects
Cellulose nanofiber
Controlled release
Microcapsules
Nanocomposite
Nanoparticle
Pickering emulsion
Microcapsules
Nanocomposite
Pickering emulsion
Nanoparticle
Controlled release
Cellulose nanofiber
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Summary:[Display omitted] We report here an approach to encapsulate N, N-diethyl-3-methylbenzamide (DEET), an insect repellent, through interfacial polycondensation using modified cellulose nanofiber (CNF) as pickering emulsifier. We found that stearic acid functionalized CNF (mCNF) can be used to form stable pickering emulsions (oil-in-oil and water-in-oil), and further encapsulate DEET using interfacial polycondensation with very high encapsulation efficiency of about 98%. Another major advantage of this approach is that mCNF can act both as pickering emulsifier and also strengthen the barrier properties of microcapsules resulting in significant reduction in release rate of DEET. Interpretation of the release profiles using standard mathematical models proposed by Ritger-Peppas show a factor of three reduction in release rate constant for the microcapsules reinforced with mCNF.
ISSN:0927-7757
1873-4359
DOI:10.1016/j.colsurfa.2019.123883