Materials from foams and emulsions stabilized by colloidal particles

Studart, André R.; Gonzenbach, Urs T.; Akartuna, Ilke; Tervoort, Elena; Gauckler, Ludwig J.

doi:10.1039/b703255b

Cited by 138 publications

(121 citation statements)

References 51 publications

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“…Ultrastable wet foams can be produced by direct foaming using particles instead of surfactants as foams stabilizers [16,19,25]. Porous ceramics' properties are also highly influenced by their chemical compositions and microstructures, with porosity, pore morphology, and size distribution being tailored by different compositions, different physical structures of the starting materials, and the use of different amphiphiles [30][31][32][33][34][35][36]. This review focuses on this process.…”

Section: Direct Foamingmentioning

confidence: 99%

“…Stabilization of the introduced species' surfaces is required to overcome coalescence, Ostwald ripening, and phase separation and can be achieved using lower-energy molecules for droplet formation. These provide steric and electrostatic barriers against coalescence [30]. Early twentieth century works by Ramsden and Pickering showed that solid particles adsorbed at liquid-liquid interfaces can stabilize the resulting Pickering emulsions, through the introduced surface active molecules lowering the system's free energy by reducing the liquid-liquid interfacial area [31].…”

Section: Introductionmentioning

confidence: 99%

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Porous Ceramics

Sarkar¹,

Kim²

2015

Advanced Ceramic Processing

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The unique chemical composition and microstructure of porous ceramics enable the ceramic products used in a number of applications such as filtration of molten metals and hot corrosive gases, high-temperature thermal insulation, support for catalytic reactions, filtration of diesel engine exhaust gases, etc. These applications take advantage of special characteristics of porous ceramics such as low thermal mass, low thermal conductivity, controlled permeability, high surface area, low density, and high specific strength. In this chapter, we emphasize on direct foaming method, a simple and versatile approach that allows fabrication of porous ceramics with tailored microstructure along with distinctive properties. Foam stability is achieved upon controlled addition of amphiphiles to the colloidal suspension, which induce in situ hydrophobization, allowing the wet foam to resist coarsening upon drying and sintering.

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Section: Direct Foamingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Porous Ceramics

Sarkar¹,

Kim²

2015

Advanced Ceramic Processing

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“…By taking up the stress, the networks of particles on the surface of bubbles compensate for the Laplace pressure differences and prevent the shrinkage of the bubbles. Since demonstrating the feasibility of the method 13,19 , there has been much interest in the study of particle stabilised bubbles, 3,14,[20][21][22][23][24][25] though preparation of Pickering bubbles still remains a more difficult proposition compared to Pickering emulsions. 26 In achieving the desired bubble stability a number of points have to be considered.…”

Section: Introductionmentioning

confidence: 99%

Effect of particle adsorption rates on the disproportionation process in pickering stabilised bubbles

Ettelaie

Murray

2014

The Journal of Chemical Physics

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The degree of shrinkage of particle stabilised bubbles of various sizes, in a polydisperse bubble dispersion, has been investigated in the light of the finite adsorption times for the particles and the disproportionation kinetics of the bubbles. For the case where the system contains an abundance of particles we find a threshold radius, above which bubbles are stabilised without any significant reduction in their size. Bubbles with an initial radius below this threshold on the other hand, undergo a large degree of shrinkage prior to stabilisation.As the ratio of the available particles to the bubbles is reduced, it is shown that the final bubble size, for the larger bubbles in the distribution, becomes increasingly governed by the number of particles, rather than their adsorption time per se. For systems with "adsorption controlled" shrinkage ratio, the final bubble distribution is found to be wider than the initial one, while for a "particle number controlled" case it is actually narrower. Starting from an unimodal bubble size distribution, we predict that at intermediate times, prior to the full stabilisation of all bubbles, the distribution breaks up into a bimodal one. However, the effect is transient and an unimodal final bubble size distribution is recovered once again, when all the bubbles are stabilised by the particles.-3-1

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“…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

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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.

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Materials from foams and emulsions stabilized by colloidal particles

Cited by 138 publications

References 51 publications

Porous Ceramics

Porous Ceramics

Effect of particle adsorption rates on the disproportionation process in pickering stabilised bubbles

Complex ceramic architectures by directed assembly of ‘responsive’ particles

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