Particle size distributions of polyaniline-silica colloidal composites

Gill, Michael; Armes, Steven P.; Fairhurst, David; Emmett, S.N.; Idzorek, G. C.; Pigott, T.

doi:10.1021/la00045a018

Cited by 77 publications

(66 citation statements)

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“…10,14,16,18,29,32,39,59,60 In addition, DCP can be used to probe the colloidal stability of particulate dispersions. For example, incipient flocculation induced by either the physical adsorption of silica nanoparticles 9 or the deposition of an ultrathin overlayer of a conducting polymer is readily detected.…”

Section: Particle Formation Mechanismmentioning

confidence: 99%

All-Acrylic Film-Forming Colloidal Polymer/Silica Nanocomposite Particles Prepared by Aqueous Emulsion Polymerization

2011

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Article:Fielding, L.A., Tonnar, J. and Armes, S.P. (2011) All-acrylic film-forming colloidal polymer/silica nanocomposite particles prepared by aqueous emulsion polymerization. Langmuir, 27 (17). 11129 -11144. ISSN 0743-7463 https://doi.org/10.1021/la202066n eprints@whiterose.ac.uk https://eprints.whiterose.ac.uk/ Reuse Unless indicated otherwise, fulltext items are protected by copyright with all rights reserved. The copyright exception in section 29 of the Copyright, Designs and Patents Act 1988 allows the making of a single copy solely for the purpose of non-commercial research or private study within the limits of fair dealing. The publisher or other rights-holder may allow further reproduction and re-use of this version -refer to the White Rose Research Online record for this item. Where records identify the publisher as the copyright holder, users can verify any specific terms of use on the publisher's website. TakedownIf you consider content in White Rose Research Online to be in breach of UK law, please notify us by emailing eprints@whiterose.ac.uk including the URL of the record and the reason for the withdrawal request. Abstract. The efficient synthesis of all-acrylic, film-forming, core-shell colloidal nanocomposite particles via in situ aqueous emulsion copolymerization of methyl methacrylate with n-butyl methacrylate in the presence of a glycerol-functionalized ultrafine silica sol using a cationic azo initiator at 60 °C is reported. It is shown that relatively monodisperse nanocomposite particles can be produced with typical mean weight-average diameters of 140 -330 nm and silica contents of up to 39 wt. %. The importance of surface functionalization of the silica sol is highlighted and it is demonstrated that systematic variation of parameters such as the initial silica sol concentration and initiator concentration affect both the mean particle diameter and the silica aggregation efficiency. The nanocomposite morphology comprises a copolymer core and a particulate silica shell, as determined by aqueous electrophoresis, x-ray photoelectron spectroscopy and electron microscopy. Moreover, it is shown that films cast from n-butyl acrylate-rich copolymer/silica nanocomposite dispersions are significantly more transparent than those prepared from the poly(styrene-co-n-butyl acrylate)/silica nanocomposite particles reported previously. In the case of the aqueous emulsion homopolymerization of methyl methacrylate in the presence of ultrafine silica, a particle formation mechanism is proposed to account for the various experimental observations made when periodically sampling such nanocomposite syntheses at intermediate comonomer conversions.

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Section: Particle Formation Mechanismmentioning

confidence: 99%

All-Acrylic Film-Forming Colloidal Polymer/Silica Nanocomposite Particles Prepared by Aqueous Emulsion Polymerization

2011

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“…2 In related work, DCP has been utilized for studying the mechanism of formation of core-shell poly(methyl methacrylate)/silica nanocomposite particles prepared by aqueous emulsion polymerization. 30 Over the last two decades or so, we have developed various formulations for the synthesis of organic/inorganic hybrid particles, in which the organic phase is either a conducting polymer [19][20][21][22][23] or a vinyl polymer [24][25][26][27][28][29][30]36 and the inorganic phase comprises silica nanoparticles. Potential applications for such colloidal nanocomposites include pH-responsive Pickering emulsifiers, 37 synthetic mimics for micrometeorites 38,39 and high performance exterior architectural coatings.…”

Section: Introductionmentioning

confidence: 99%

Correcting for a Density Distribution: Particle Size Analysis of Core–Shell Nanocomposite Particles Using Disk Centrifuge Photosedimentometry

et al. 2012

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Abstract. Many types of colloidal particles possess a core-shell morphology. In this paper we show that, if the core and shell densities differ, this morphology leads to an inherent density distribution for particles of finite polydispersity. If the shell is denser than the core, this density distribution implies an artificial narrowing of the particle size distribution as determined by disk centrifuge photosedimentometry (DCP). In the specific case of polystyrene/silica nanocomposite particles, which consist of a polystyrene core coated with a monolayer shell of silica nanoparticles, we demonstrate that the particle density distribution can be determined by analytical ultracentrifugation and introduce a mathematical method to account for this density distribution by reanalyzing the raw DCP data. Using the mean silica packing density calculated from small-angle xray scattering, the real particle density can be calculated for each data point. The corrected DCP particle size distribution is both broader and more consistent with particle size distributions reported for the same polystyrene/silica nanocomposite sample using other sizing techniques, such as electron microscopy, laser light diffraction and dynamic light scattering. Artifactual narrowing of the size distribution is also likely to occur for many other polymer/inorganic nanocomposite particles comprising a low-density core of variable dimensions coated with a high-density shell of constant thickness, or for core-shell latexes where the shell is continuous rather than particulate in nature.

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“…The almost pure iron microspheres were produced by catalyzing iron pentacarbonyl gas causing a 'hailstorm' of spheres with a nominal [1][2][3][4][5][6][7][8][9][10] micron diameter although our experiments show a substantial number of much smaller particles, To optimally accelerate the sphere one must first isolate it from its neighbors and electrically charge it to a high value. A technique of charging and separating particles of dust was developed by Shelton and consisted of two oppositely biased parallel plates with a needle projecting from one of the plates positioned over a small hole in the other plate.…”

Section: Dust Sourcementioning

confidence: 99%

<title>Hypervelocity microparticle characterization</title>

Idzorek

1996

SPIE Proceedings

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Particle size distributions of polyaniline-silica colloidal composites

Cited by 77 publications

References 0 publications

All-Acrylic Film-Forming Colloidal Polymer/Silica Nanocomposite Particles Prepared by Aqueous Emulsion Polymerization

All-Acrylic Film-Forming Colloidal Polymer/Silica Nanocomposite Particles Prepared by Aqueous Emulsion Polymerization

Correcting for a Density Distribution: Particle Size Analysis of Core–Shell Nanocomposite Particles Using Disk Centrifuge Photosedimentometry

<title>Hypervelocity microparticle characterization</title>

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