Synthesis of Covalently Cross-Linked Colloidosomes from Peroxidized Pickering Emulsions

Abstract

Abstract:A new approach to the formation of cross-linked colloidosomes was developed on the basis of Pickering emulsions that were stabilized exclusively by peroxidized colloidal particles. Free radical polymerization and a soft template technique were used to convert droplets of a Pickering emulsion into colloidosomes.The peroxidized latex particles were synthesized in the emulsion polymerization process using amphiphilic polyperoxide copolymers poly(2-tert-butylperoxy-2-methyl-5-hexen-3-ine-co-maleic acid) (PM-1-MAc) or poly[N-(tert-butylperoxymethyl)acrylamide]-co-maleic acid (PM-2-MAc), which were applied as both initiators and surfactants (inisurfs). The polymerization in the presence of the inisurfs results in latexes with a controllable amount of peroxide and carboxyl groups at the particle surface. Peroxidized polystyrene latex particles with a covalently grafted layer of inisurf PM-1-MAc or PM-2-MAc were used as Pickering stabilizers to form Pickering emulsions. A mixture of styrene and/or butyl acrylate with divinylbenzene and hexadecane was applied as a template for the synthesis of colloidosomes. Peroxidized latex particles located at the interface are involved in the radical reactions of colloidosomes formation. As a result, covalently cross-linked colloidosomes were obtained. It was demonstrated that the structure of the synthesized (using peroxidized latex particles) colloidosomes depends on the amount of functional groups and pH during the synthesis. Therefore, the size and morphology of colloidosomes can be controlled by latex particle surface properties.

Preparation of Poly(L,L‐Lactide) Microparticles via Pickering Emulsions Using Chitin Nanocrystals

“…e Pickering emulsions were successfully used for preparation of a so-called magnetic polymer microspheres consisted of polystyrene core and Fe 3 O 4 nanoparticle shells [11]. A range of polymeric nanoparticles made of polymer brushes or polymer-grafted particles of various natures could be also used for the Pickering emulsions, which allows one to synthetize new nanocomposites dedicated to specific applications [12][13][14][15][16][17][18]. Usage of biocompatible nanoparticles, such as hydroxyapatite, SiO 2 , proteins, lignin, flavonoids, and various polysaccharides, for the Pickering emulsion stabilization is especially interesting for food or biomedical applications [19][20][21][22].…”

Review on Pickering emulsions stabilized by adsorbed nanoparticles: Structure, Thermodynamics, Cage Effect and Subdiffusion

“…The one-step formation of multiple PEs stabilized by the self-assembled poly (dodecyl acrylate-co-acrylic acid) nanoparticles as emulsifi ers has been the subject of some experimental work [61]. As last example, we recall that a new approach to the formation of cross-linked colloidosomes was developed [62], on the basis of PEs, stabilized exclusively by peroxidized colloidal particles.…”