Thermostimulable wax@SiO2 core-shell particles

Langmuir : the ACS Journal of Surfaces and Colloids
Mathieu DestribatsRénal Backov

Abstract

We propose a new synthesis pathway without any sacrificial template to prepare original monodisperse thermoresponsive capsules made of a wax core surrounded by a silica shell. Under heating, the inner wax expands and the shell breaks, leading to the liquid oil release. Such capsules that allow triggered deliverance provoked by an external stimulus belong to the class of smart materials. The process is based on the elaboration of size-controlled emulsions stabilized by particles (Pickering emulsions) exploiting the limited coalescence phenomenon. Then the emulsions are cooled down and the obtained suspensions are mineralized by the hydrolysis and condensation of a monomer at the wax-water interface, leading to the formation of capsules. The shell break and the liquid oil release are provoked by heating above the wax melting temperature. We characterize the obtained materials and examine the effect of processing parameters and heating history. By an appropriate choice of the wax, the temperature of release can easily be tuned.

References

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Citations

Mar 26, 2013·Physical Chemistry Chemical Physics : PCCP·Victoria FlexerNicolas Mano
Sep 12, 2013·Langmuir : the ACS Journal of Surfaces and Colloids·Julius W J de FolterWillem K Kegel
Apr 1, 2014·Advances in Colloid and Interface Science·V DutschkV M Starov
Jul 24, 2014·Langmuir : the ACS Journal of Surfaces and Colloids·Mathieu DestribatsVéronique Schmitt
May 27, 2011·ACS Applied Materials & Interfaces·W C E Schofield, J P S Badyal
Apr 1, 2016·Langmuir : the ACS Journal of Surfaces and Colloids·Marion BaillotRénal Backov
Feb 28, 2017·Journal of Materials Chemistry. B, Materials for Biology and Medicine·T BollhorstK Rezwan
Feb 24, 2017·Chemical Society Reviews·Tobias BollhorstMichael Maas
Aug 11, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·Zhi ChenMartin Möller

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