Preparation and characterisation of a novel buoyancy and refractive index matched oil-in-water emulsion

Hibberd, David J.; Mackie, Alan; Moates, G. K.; Penfold, Robert B.; Watson, Andrew D.; Barker, G. C.

doi:10.1016/j.colsurfa.2007.01.023

Cited by 13 publications

(10 citation statements)

References 40 publications

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“… 15 Contrast-matched emulsions have also been studied by confocal laser scanning microscopy in order to image the droplet interior. 16 However, it is emphasized that each of these emulsion formulations contains water. In this work, we describe Pickering emulsions that are both wholly non-aqueous and almost isorefractive in nature.…”

Section: Introductionmentioning

confidence: 99%

Non-aqueous Isorefractive Pickering Emulsions

et al. 2015

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Non-aqueous Pickering emulsions of 16–240 μm diameter have been prepared using diblock copolymer worms with ethylene glycol as the droplet phase and an n-alkane as the continuous phase. Initial studies using n-dodecane resulted in stable emulsions that were significantly less turbid than conventional water-in-oil emulsions. This is attributed to the rather similar refractive indices of the latter two phases. By utilizing n-tetradecane as an alternative oil that almost precisely matches the refractive index of ethylene glycol, almost isorefractive ethylene glycol-in-n-tetradecane Pickering emulsions can be prepared. The droplet diameter and transparency of such emulsions can be systematically varied by adjusting the worm copolymer concentration.

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Section: Introductionmentioning

confidence: 99%

Non-aqueous Isorefractive Pickering Emulsions

et al. 2015

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“…In systems with matching refractive indices, the Hamaker constant approaches zero and as such the attractive van der Waals forces between droplets are minimized [58][59][60][61][62]. This concept has previously been employed by deliberately creating emulsions where the dispersed/continuous liquid phases have similar RI values 58,59.…”

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confidence: 99%

Radical polymerization of miniemulsions induced by compressed gases

et al. 2016

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Generation of miniemulsions (nanoemulsions) comprising hydrophobic vinyl monomers and water by use of the compressed gases carbon dioxide and ethylene, respectively, has been investigated in the absence of high energy mixing. It is proposed that transparent/translucent miniemulsions are formed at the transparency pressure (P T ) as a result of the refractive index of the dispersed phase being reduced due to expansion with carbon dioxide/ethylene, resulting in refractive index matched miniemulsions with enhanced stability. Radical polymerization of methyl acrylate at 40 C in miniemulsions induced by carbon dioxide at P T proceeds as a hybrid miniemulsion/emulsion polymerization system generating particles with diameters less than 100 nm. The experimental data are consistent with particle formation occurring mainly via monomer droplet nucleation (miniemulsion polymerization) but also via secondary nucleation in the aqueous phase (emulsion polymerization). Polymerizations at a range of pressures above and below P T revealed limited pressure effects on the polymerization rate and particle size for both carbon dioxide and ethylene.

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“…1 The isorefractive emulsions exhibit high transparency which enabled us to study the proteins adsorbed at an oil/water interface 2 and to image the interior of droplets in emulsions. 3 High internal phase emulsions (HIPEs) are emulsions having a total volume fraction of the dispersed/internal phase of over 74%. 4 HIPEs are also called gel emulsions because they have a high viscosity 5 which makes them more advantageous over common emulsions as reaction media 6,7 or templates to prepare macroporous materials (termed as polyHIPEs).…”

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Isorefractive high internal phase emulsion organogels for light induced reactions

Zhang

Guo

2016

Chem. Commun.

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Isorefractive high internal phase emulsion (HIPE) organogels have been fabricated and investigated for light induced reactions. High transparency facilitates both the UV and visible light induced reactions within HIPE organogels. Transparent HIPE organogels are advantageous for light induced polymerizations, accelerating such polymerizations and enabling the preparation of large polyHIPE monoliths.

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Preparation and characterisation of a novel buoyancy and refractive index matched oil-in-water emulsion

Cited by 13 publications

References 40 publications

Non-aqueous Isorefractive Pickering Emulsions

Non-aqueous Isorefractive Pickering Emulsions

Radical polymerization of miniemulsions induced by compressed gases

Isorefractive high internal phase emulsion organogels for light induced reactions

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