Synthesis and applications of emulsion-templated porous materials

Zhang, Haifei; Cooper, Andrew I.

doi:10.1039/b502551f

Cited by 415 publications

(281 citation statements)

References 56 publications

Supporting

Mentioning

279

Contrasting

Order By: Relevance

“…Most commonly, high internal phase emulsions (polyHIPE) that by definition fill more >74% of the internal (dispersed) phase volume are used to create highly macroporous materials that avoid the formation of closed-cell porous structures common to porogen or gas foaming techniques. [59,60] Bicontinuous polyHIPEs are formed via polymerization of one (or both) of the hydrophilic and hydrophobic phases, which can either be oil-in-water or water-in oil emulsions. For the formation of polyHIPE-based structured hydrogels, the gel precursor monomers or polymer chains and crosslinker are typically dissolved in the aqueous phase, which is subsequently emulsified with an immiscible but relatively easy to extract organic solvent.…”

Section: Bicontinuous Emulsion Templatingmentioning

confidence: 99%

Structured Macroporous Hydrogels: Progress, Challenges, and Opportunities

Hoare

2017

Adv Healthcare Materials

178

168

View full text Add to dashboard Cite

Structured macroporous hydrogels that have controllable porosities on both the nanoscale and the microscale offer both the swelling and interfacial properties of bulk hydrogels as well as the transport properties of “hard” macroporous materials. While a variety of techniques such as solvent casting, freeze drying, gas foaming, and phase separation have been developed to fabricate structured macroporous hydrogels, the typically weak mechanics and isotropic pore structures achieved as well as the required use of solvent/additives in the preparation process all limit the potential applications of these materials, particularly in biomedical contexts. This review highlights recent developments in the field of structured macroporous hydrogels aiming to increase network strength, create anisotropy and directionality within the networks, and utilize solvent‐free or additive‐free fabrication methods. Such functional materials are well suited for not only biomedical applications like tissue engineering and drug delivery but also selective filtration, environmental sorption, and the physical templating of secondary networks.

show abstract

Section: Bicontinuous Emulsion Templatingmentioning

confidence: 99%

Structured Macroporous Hydrogels: Progress, Challenges, and Opportunities

Hoare

2017

Adv Healthcare Materials

178

168

View full text Add to dashboard Cite

show abstract

“…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

View full text Add to dashboard Cite

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

show abstract

“…Sacrificial templating uses natural or synthetic hard templates (for example polymeric foams, wood or coral) and impregnation of colloidal suspensions to create ceramic foams with the same structure as the original template [9]. Emulsion templating is another path used to fabricate cellular ceramics, metals and polymers [12][13][14][15][16][17][18][19][20]. Although particle stabilized emulsions are known for more than a century [21], many authors have delved into their understanding and application to build cellular materials in recent studies [13,15,22,23].…”

Section: Introductionmentioning

confidence: 99%

Complex ceramic architectures by directed assembly of ‘responsive’ particles

Garcı́a-Tuñón¹,

Machado²,

Schneider³

et al. 2017

Journal of the European Ceramic Society

View full text Add to dashboard Cite

Surface functionalization of alumina powders with a responsive surfactant (BCS) leads to particles that react to a chemical switch. These 'responsive' building blocks are capable of assembling into macroscopic and complex ceramic structures. The aggregation follows a bottom up approach and can be easily controlled. The directed assembly of concentrated suspensions leads to highly dense (~99%) ceramic components with average 4-point bending strength of ~200 MPa. On the other hand, the emulsification of suspensions with concentrations from 7 to 43 vol% and 50 vol% decane results in emulsions with different properties (stability, droplet size and distribution). The oil droplets provide a soft template confining the alumina particles in the continuous phase and at the oil/water interfaces. Aggregation of these emulsions followed by drying and sintering leads to macroporous (pore sizes ranging from 30 to 4 µm) alumina structures with complex shapes and a wide range of microstructures, from closed cell structures to highly interconnected foams with total porosities up to 83%. Alumina scaffolds with ~55 % porosity can reach crushing strength values above 300 MPa in compression and ~50 MPa in 4-point bending.

show abstract

Synthesis and applications of emulsion-templated porous materials

Cited by 415 publications

References 56 publications

Structured Macroporous Hydrogels: Progress, Challenges, and Opportunities

Structured Macroporous Hydrogels: Progress, Challenges, and Opportunities

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

Complex ceramic architectures by directed assembly of ‘responsive’ particles

Contact Info

Product

Resources

About