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Charged microcapsul...
Charged microcapsules for controlled release of hydrophobic actives. Part 1: encapsulation methodology and interfacial properties
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- Andersson Trojer, Markus, 1981 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Li, Ye, 1986 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Abrahamsson, Christoffer, 1984 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Mohamed, A. (author)
- University of Bristol
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- Eastoe, J. (author)
- University of Bristol
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- Holmberg, Krister, 1946 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Nydén, Magnus, 1970 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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(creator_code:org_t)
- 2013
- 2013
- English.
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In: Soft Matter. - : Royal Society of Chemistry (RSC). - 1744-6848 .- 1744-683X. ; 9:5, s. 1468-1477
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https://doi.org/10.1...
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Abstract
Subject headings
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- Highly charged microcapsules have been prepared using the internal phase separation technique. The charges are introduced by using ionic dispersants, which have been characterized with respect to surface activity with a quartz crystal microbalance with dissipation monitoring and with optical tensiometry. The long-term stability of the microcapsule suspension without excess dispersant, as well as the stability at high ionic strength, have been investigated. Three types of ionic dispersants have been evaluated: a weak polyacid (poly(methacrylic acid)), a small set of ionic amphiphilic block copolymers of poly(methyl methacrylate)-block-poly(sodium (meth) acrylate) type and an oil-soluble anionic surfactant, sodium 1,5-dioxo-1,5-bis(3,5,5-trimethylhexyloxy)-3-((3,5,5-trimethylhexyloxy)carbonyl)pentane-2-sulfonate, in combination with a water-soluble polycation, poly(diallyldimethylammonium chloride). The block copolymer based microcapsule suspension is characterized by a long-term stability, even at high ionic strength, provided by electrostatic and steric stabilization. The weak polyacid based microcapsule suspension is stable for a few weeks, after which aggregation starts due to desorption of the dispersant. The surfactant-polycation based microcapsules appear to have a multicore morphology in contrast to the weak polyacid or block copolymer based microcapsules, which are core-shell particles.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Kemiteknik -- Annan kemiteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Chemical Engineering -- Other Chemical Engineering (hsv//eng)
- NATURVETENSKAP -- Kemi -- Annan kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Other Chemistry Topics (hsv//eng)
Publication and Content Type
- art (subject category)
- ref (subject category)
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