Formation and mechanical characterization of aminoplast core/shell microcapsules

ACS Applied Materials & Interfaces
Melanie PretzlAndreas Fery

Abstract

This work aims at establishing a link between process conditions and resulting micromechanical properties for aminoplast core/shell microcapsules. The investigated capsules were produced by the in situ polymerization of melamine formaldehyde resins, which represents a widely used and industrially relevant approach in the field of microencapsulation. Within our study, we present a quantitative morphological analysis of the capsules' size and shell thickness. The diameter of the investigated capsules ranged from 10 to 50 μm and the shell thickness was found in a range between 50 and 200 nm. As key parameter for the control of the shell thickness, we identified the amount of amino resin per total surface area of the dispersed phase. Mechanical properties were investigated using small deformations on the order of the shell thickness by atomic force microscopy with a colloidal probe setup. The obtained capsule stiffness increased with an increasing shell thickness from 2 to 30 N/m and thus showed the same trend on the process parameters as the shell thickness. A simple analytical model was adopted to explain the relation between capsules' geometry and mechanics and to estimate the elastic modulus of the shell about 1.7 GPa. Thus, th...Continue Reading

References

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Apr 29, 2010·ACS Applied Materials & Interfaces·Mary M CarusoJeffrey S Moore
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Citations

May 9, 2013·European Biophysics Journal : EBJ·Ruben Mercadé-PrietoZhibing Zhang
Dec 19, 2013·Advances in Colloid and Interface Science·Martin P NeubauerAndreas Fery
Dec 23, 2015·ACS Applied Materials & Interfaces·Houwen Matthew PanAndreas Fery
Dec 6, 2014·ACS Applied Materials & Interfaces·Zhanfeng LiXuejun Cui
Aug 15, 2015·ACS Applied Materials & Interfaces·Zhanfeng LiXuejun Cui
Nov 26, 2013·Advances in Colloid and Interface Science·Gregory Dardelle, Philipp Erni
Jul 28, 2013·Langmuir : the ACS Journal of Surfaces and Colloids·James P BestFrank Caruso
Dec 11, 2013·Langmuir : the ACS Journal of Surfaces and Colloids·Christian KuttnerAndreas Fery
Dec 22, 2016·Microscopy and Microanalysis : the Official Journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada·Hamed HeidariDominique Schryvers
Oct 14, 2013·Journal of Materials Chemistry. B, Materials for Biology and Medicine·Shaohua MaWilhelm T S Huck
Apr 5, 2018·Scientific Reports·Kristina BašnecMarta Klanjšek Gunde
May 29, 2020·ACS Applied Materials & Interfaces·Marianna MamusaPiero Baglioni
Mar 18, 2020·Journal of Colloid and Interface Science·Nan YangGlyn O Phillips
Jul 20, 2018·ACS Applied Materials & Interfaces·Anna C H CoughlanMichael A Bevan

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