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Charged microcapsules for controlled release of hydrophobic actives. Part 1: encapsulation methodology and interfacial properties

Markus Andersson Trojer (Institutionen för kemi- och bioteknik, Teknisk ytkemi ; SuMo Biomaterials) ; Ye Li (Institutionen för kemi- och bioteknik, Teknisk ytkemi) ; Christoffer Abrahamsson (Institutionen för kemi- och bioteknik, Teknisk ytkemi ; SuMo Biomaterials) ; Azmi Mohammed ; Julian Eastoe ; Krister Holmberg (Institutionen för kemi- och bioteknik, Teknisk ytkemi) ; Magnus Nydén (Institutionen för kemi- och bioteknik, Teknisk ytkemi ; SuMo Biomaterials)
Soft Matter (1744-683X). Vol. 9 (2013), 5, p. 1468-1477.
[Artikel, refereegranskad vetenskaplig]

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.



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Denna post skapades 2013-01-03. Senast ändrad 2016-07-13.
CPL Pubid: 168972

 

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Institutioner (Chalmers)

Institutionen för kemi- och bioteknik, Teknisk ytkemi (2005-2014)
SuMo Biomaterials

Ämnesområden

Materialvetenskap
Annan kemi
Annan kemiteknik

Chalmers infrastruktur