Colloidal Templating

Cameron, Neil R.; Krajnc, Peter; Silverstein, Michael S.

doi:10.1002/9780470929445.ch4

Cited by 34 publications

(22 citation statements)

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“…Nevertheless, these methods remained ineffective in adding inter pore connectivity in porous supports 26 and were not able to develop well-resolved surface pore morphology. 25 Thus, highly inter-connected porous polymer monoliths are developed via the polymerization of surfactant-stabilized [27][28][29][30][31][32] high-internal-phase emulsions (HIPEs) with a volume ratio of dispersed phase of >74%. 33,34 The polymerization of HIPEs led to the formation of open-cell-structured macro-porous polymer monoliths with sufficiently high surface area and low density.…”

Section: Introductionmentioning

confidence: 99%

“…33,34 The polymerization of HIPEs led to the formation of open-cell-structured macro-porous polymer monoliths with sufficiently high surface area and low density. 31,35,36 These emulsion-templated, interconnected, and open-cell-structured highly porous monoliths 29 are found to be useful in various applications such as supports for catalysts, 6,[37][38][39][40][41] recovery of residual oils, 42 media for the storage of gases, 43 or as an ion exchanger for the separation of metal ions. 21,44 The nanoparticles supported on polyHIPE monoliths are more efficient 5,45 due to better ow and mass transport properties of monoliths, 6,[46][47][48][49][50][51] which is well suited for catalysis.…”

Section: Introductionmentioning

confidence: 99%

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Poly(vinylbenzyl chloride-co-divinyl benzene) polyHIPE monolith-supported o-hydroxynaphthaldehyde propylenediamine Schiff base ligand complex of copper(ii) ions as a catalyst for the epoxidation of cyclohexene

et al. 2019

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Poly(vinylbenzyl chloride-co-divinyl benzene) polyHIPE monolith-supported o-hydroxynaphthaldehyde propylenediamine Schiff base ligand complex of copper(ii) ions as a catalyst for the epoxidation of cyclohexene

et al. 2019

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“…A polyHIPE is a porous polymer polymerized within the continuous, external phase of a high internal phase emulsion (HIPE), an emulsion with a dispersed phase volume fraction of at least 0.74 . The formation of interconnecting holes in the thin polymer wall between the individual internal phase droplets generates continuity in the internal phase.…”

Section: Introductionmentioning

confidence: 99%

High porosity, responsive hydrogel copolymers from emulsion templating

Ovadia

Silverstein

2015

Polymer International

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Hydrogels, three-dimensional hydrophilic polymer network structures, can absorb many times their dry weight in water. PolyHIPEs are highly porous polymers synthesized within high internal phase emulsions (HIPEs). Here, the water uptakes in novel hydrogel polyHIPE copolymers of hydroxyethyl methacrylate (HEMA, a non-ionic monomer) and methacrylic acid (MAA, an ionic monomer) were investigated. The PHEMA-based polyHIPE had a density of 0.14 g cm −3 , void diameters of 50-100 m and a void-dominated Fickian water uptake of around 10.4 g g −1 . The polyHIPE density increased, and the porous structure became less polyHIPE-like, with increasing MAA content, reflecting a reduction in the stability of the HIPE. The water uptake increased with increasing pH for all the copolymers and the water absorption mechanism changed from Fickian at pH 2 to anomalous, dominantly case II, at pH 10. The maximum uptake of 18.2 g g −1 at pH 10, for a HEMA to MAA mass ratio of 1/1, was ascribed to hydrogel-swelling-driven void expansion. The hydrogel's absorptive and responsive properties were amplified by the polyHIPE's porous structure. These results demonstrate that the compositions of hydrogel polyHIPE copolymers can be designed to enhance their water uptake.

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“…Emulsion templating is a convenient method to prepare highly porous polymeric materials with well-defined morphology [1][2][3][4][5][6] . The process involves preparing a high internal phase emulsion (HIPE), i.e.…”

Section: Introductionmentioning

confidence: 99%

Degradable emulsion-templated scaffolds for tissue engineering from thiol–ene photopolymerisation

et al. 2012

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Further information on publisher's website:http://dx.doi.org/10.1039/c2sm26250aPublisher's copyright statement:Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. AbstractEmulsion templating has been used to prepare highly porous polyHIPE materials by thiol-ene photoinitiated network formation. Commercially available multifunctional thiols and acrylates were formulated into water-in-oil high internal phase emulsions (HIPEs) using an appropriate surfactant, and the HIPEs were photo-cured. The temperature of the HIPE aqueous phase was found to influence the morphology of the resulting materials. In agreement with previous work, a higher aqueous phase temperature (80 o C) gave rise to a larger mean void and interconnect diameter. The influence of temperature on morphology was found to be reduced at higher porosity, but still significant. The Young's modulus of the porous materials was shown to be related to the functionality of the acrylate comonomer used. A mixture of penta-and hexa-acrylate gave rise to a 100-fold increase in modulus, compared to an analogous tri-functional acrylate. The materials could be functionalised conveniently by addition of mono-acrylates or thiols to the organic phase of the precursor HIPE. Degradation was observed to occur at a rate depending on the degradation conditions. Under cell culture conditions at 37 o C, 19% mass loss occurred over 15 weeks. The scaffolds were found to be capable of supporting the growth of keratinocytic cells (HaCaTs) over 11 days in culture. Some penetrative in-growth of the cells into the scaffold was observed.3

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Colloidal Templating

Cited by 34 publications

References 296 publications

Poly(vinylbenzyl chloride-co-divinyl benzene) polyHIPE monolith-supported o-hydroxynaphthaldehyde propylenediamine Schiff base ligand complex of copper(ii) ions as a catalyst for the epoxidation of cyclohexene

Poly(vinylbenzyl chloride-co-divinyl benzene) polyHIPE monolith-supported o-hydroxynaphthaldehyde propylenediamine Schiff base ligand complex of copper(ii) ions as a catalyst for the epoxidation of cyclohexene

High porosity, responsive hydrogel copolymers from emulsion templating

Degradable emulsion-templated scaffolds for tissue engineering from thiol–ene photopolymerisation

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