Synthesis of microcapsules with polystyrene/ZnO hybrid shell by Pickering emulsion polymerization

Chen, Wenbao; Liu, Xuyan; Liu, Yangshuo; Kim, Hyung Il

doi:10.1007/s00396-010-2277-8

Cited by 68 publications

(27 citation statements)

References 34 publications

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“…Fang et al [20] reported organoclay (Cloisite 20A and 15A) stabilized PANI/clay core-shell ER particles via a Pickering emulsion process, which introduced a new way for preparation of ER materials. In addition to clay nanosheets, SiO 2 [21,22], CeO 2 [23], ZnO [5], and Fe 3 O 4 [24] were all reported as solid emulsifiers in the synthesis of PANI core-shell particles by Pickering emulsion polymerization.…”

Section: Introductionmentioning

confidence: 98%

“…A major benefit of such a study is the combination and synergic effect of the advantages of both the organic and inorganic elements. Especially, as a special kind of polymer, conducting polymer-based composites with inorganic materials such as clay, SiO 2 , TiO 2 , Fe 3 O 4 , carbon nanotube, and so on has attracted considerable attention due to the unique physical and chemical characters of the polymer and incorporated inorganics [4][5][6][7][8]. Thus, a series of synthesis strategies for preparing different kinds of the composite materials have been developed and applied for commercial productions.…”

Section: Introductionmentioning

confidence: 99%

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Pickering emulsion polymerization of core–shell-structured polyaniline@SiO2 nanoparticles and their electrorheological response

2012

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We synthesized semiconducting polyaniline (PANI) nanoparticles through a solid-stabilized Pickering emulsion route using silica nanoparticles. Specific morphologies of the silica nanoparticle wrapped PANI particles were observed using both scanning electron microscope and transmission electron microscope, which showed the emulsifiability of silica nanoparticles in the emulsion system. Electrorheological (ER) behavior of this novel particlebased ER fluid dispersed in silicone oil was measured by a controlled shear stress rheometer and analyzed with a flow curve equation of Cho-Choi-Jhon model, which fitted well the flow curves measured in the exposed electric field.

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Pickering emulsion polymerization of core–shell-structured polyaniline@SiO2 nanoparticles and their electrorheological response

2012

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“…Due to their remarkable properties, such as high stability with respect to coalescence and their recent use in nanotechnology leading to the creation and the characterization of the nanoscale structures in new ways, PEs have been the subject of much studies, both from experimental and theoretical point of views. In addition, they can serve as templates for the advanced materials, as Janus colloids [8], composite particles [9][10][11][12][13][14][15][16][17][18], and colloidosomes [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

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

El-Moudny¹

2017

Int J Nanomater Nanotechnol Nanomed

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In this review paper, we report on some very recent fi ndings dealt with the oil-in-water Pickering emulsions, stabilized by a strong adsorption of charged solid nanoparticles on the surface of the oildroplets. Here, we are concerned with three important questions: (1) Structure and thermodynamics of these emulsions, (2) cage effect and subdiffusion phenomenon within them, and (3) spherical diffusion of anchored nanoparticles on the curved oil/water interface. For the study, the emulsions are regarded as colloidal solutions, where the clothed oil-droplets play the role of charged soft-colloids, and in addition, the adsorbed nanoparticles are assumed to be point-like. For question (1), we recall the essential steps allowing the determination of the structure-factor and the spatial-correlation function, and the thermodynamic properties, as pressure, internal energy, and thermal compressibility of these emulsions. To this end, the adopted pair-potential is that of Sogami-Ise combining repulsive and attractive forces, and use is made of the so-called Integral Equation Method. The question (2) deals with a quantitative investigation of the clothed oil-droplets dynamics (cage effect and subdiffusion), using a Generalized Langevin Equation, which is successfully tested by Molecular Dynamic Simulations. The question (3) is concerned with an exact study of the spherical diffusion of anchored nanoparticles on the surface of the dispersed oil-droplets. Finally, we precise the major role played by grafted polymers onto the spherical oil/water interface.

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“…1,2 A wide range of particles, such as polystyrene latexes, 3,4,5 clay nanoparticles 6 ,7 ,8 and inorganic sols 9,10 have been reported to be effective Pickering emulsifiers. A particularly important class of Pickering emulsifiers is silica nanoparticles, 11 which have been used to form pH-responsive 12 and thermo-responsive 13,14 Pickering emulsions, as well as microcapsules known as colloidosomes.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Double Emulsions using Hybrid Polymer/Silica Particles: New Pickering Emulsifiers with Adjustable Surface Wettability

Williams

Warren

Fielding

et al. 2014

ACS Appl. Mater. Interfaces

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Abstract.A facile route for the preparation of water-in-oil-in-water (w/o/w) double emulsions is described for three model oils, namely n-dodecane, isopropyl myristate and isononyl isononanoate, using fumed silica particles coated with poly(ethylene imine) (PEI). The surface wettability of such hybrid PEI/silica particles can be systematically adjusted by (i) increasing the adsorbed amount of PEI and (ii) addition of 1-undecanal to the oil phase prior to homogenization. In the absence of this long-chain aldehyde, PEI/silica hybrid particles (PEI/silica mass ratio = 0.50) produce o/w Pickering emulsions in all cases. In the presence of 1-undecanal, this reagent reacts with the primary and secondary amine groups on the PEI chains via Schiff base chemistry, which can render the PEI/silica hybrid particles sufficiently hydrophobic to stabilize w/o Pickering emulsions at 20 o C. Gas chromatography, 1 H NMR and x-ray photoelectron spectroscopy provide compelling experimental evidence for this in situ surface reaction, while a significant increase in the water contact angle indicates markedly greater hydrophobic character for the PEI/silica hybrid particles. However, when PEI/silica hybrid particles are prepared using a relatively low adsorbed amount of PEI (PEI/silica mass ratio = 0.075) only o/w Pickering emulsions are obtained, since the extent of surface modification achieved using this Schiff base chemistry is insufficient. Fluorescence microscopy and laser diffraction studies confirm that highly stable w/o/w double emulsions can be achieved for all three model oils. This is achieved by first homogenizing the relatively hydrophobic PEI/silica hybrid particles (PEI/silica mass ratio = 0.50) with an oil containing 3 % 1-undecanal to form an initial w/o emulsion, followed by further homogenization using an aqueous dispersion of relatively hydrophilic PEI/silica particles (PEI/silica mass ratio = 0.075).Dye release from the internal aqueous cores into the aqueous continuous phase was monitored by visible absorption spectroscopy. These studies indicate immediate loss of 12-18 % dye during the high speed homogenization that is required for double emulsion formation, but no further dye release is observed at 20 °C for at least 15 days thereafter.

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Synthesis of microcapsules with polystyrene/ZnO hybrid shell by Pickering emulsion polymerization

Cited by 68 publications

References 34 publications

Pickering emulsion polymerization of core–shell-structured polyaniline@SiO2 nanoparticles and their electrorheological response

Pickering emulsion polymerization of core–shell-structured polyaniline@SiO2 nanoparticles and their electrorheological response

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

Preparation of Double Emulsions using Hybrid Polymer/Silica Particles: New Pickering Emulsifiers with Adjustable Surface Wettability

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