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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Williams, Mark Armes, Steven P. Verstraete, Pierre Smets, Johan Olland, Birte |
| Description | Country affiliation: United kingdom Author Affiliation: Williams M ( Department of Chemistry, University of Sheffield, Brook Hill, Sheffield, South Yorkshire S3 7HF, UK.); Olland B ( Department of Chemistry, University of Sheffield, Brook Hill, Sheffield, South Yorkshire S3 7HF, UK.); Armes SP ( Department of Chemistry, University of Sheffield, Brook Hill, Sheffield, South Yorkshire S3 7HF, UK. Electronic address: s.p.armes@sheffield.ac.uk.); Verstraete P ( Procter & Gamble, Eurocor NV/SA, Temselaan 100, 1853 Strombeek-Bever, Belgium.); Smets J ( Procter & Gamble, Eurocor NV/SA, Temselaan 100, 1853 Strombeek-Bever, Belgium.) |
| Abstract | A facile synthesis route to novel inorganic/organic hybrid microcapsules is reported. Laponite nanoparticles are surface-modified via electrostatic adsorption of Magnafloc, an amine-based polyelectrolyte allowing the formation of stable oil-in-water Pickering emulsions. Hybrid microcapsules can be subsequently prepared by coating these Pickering emulsion precursors with dense melamine formaldehyde (MF) shells. Employing a water-soluble polymeric stabiliser, poly(acrylamide-co-sodium acrylate) leads to stable hybrid microcapsules that survive an alcohol challenge and the ultrahigh vacuum conditions required for SEM studies. Unfortunately, the presence of this copolymer also leads to secondary nucleation of excess MF latex particles in the aqueous continuous phase. However, since the Magnafloc is utilised at submonolayer coverage when coating the Laponite particles, the nascent cationic MF nanoparticles can deposit onto anionic surface sites on the Laponite, which removes the requirement for the poly(acrylamide-co-sodium acrylate) component. Following this electrostatic adsorption, the secondary amine groups on the Magnafloc chains can react with the MF, leading to highly robust cross-linked MF shells. The absence of the copolymer leads to minimal secondary nucleation of MF latex particles, ensuring more efficient deposition at the surface of the emulsion droplets. However, the MF shells appear to become more brittle, as SEM studies reveal cracking on addition of ethanol. |
| ISSN | 00219797 |
| Journal | Journal of Colloid and Interface Science |
| Volume Number | 460 |
| e-ISSN | 10957103 |
| Language | English |
| Publisher | Elsevier |
| Publisher Date | 2015-12-15 |
| Publisher Place | United States |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Discipline Colloid & Interface Science |
| Content Type | Text |
| Resource Type | Article |
| Subject | Surfaces, Coatings and Films Colloid and Surface Chemistry Biomaterials Electronic, Optical and Magnetic Materials |
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