Designing macroporous polymers from particle-stabilized foams

Wong, J.; Tervoort, Elena; Busato, Stephan; Gonzenbach, Urs T.; Studart, André R.; Ermanni, Paolo; Gauckler, Ludwig J.

doi:10.1039/c0jm00655f

Cited by 41 publications

(47 citation statements)

References 34 publications

(54 reference statements)

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“…However, above a critical amphiphile concentration, surface tension decreased sharply. Above this critical amphiphile concentration, the particles are sufficiently hydrophobic at the air-water interface and decrease surface tension more greatly than that expected from free amphiphiles alone [48]. This significant reduction in surface tension upon particle adsorption was caused by a decrease of the total area of the highly energetic air-water interface.…”

Section: Contact Angle and Surface Tensionmentioning

confidence: 79%

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: Contact Angle and Surface Tensionmentioning

confidence: 79%

Porous Ceramics

Sarkar¹,

Kim²

2015

Advanced Ceramic Processing

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“…The contact angles formed between PVDF and ethanol-water solutions as well as those formed between Al 2 O 3 hydrophobized with valeric acid and water have been reported and have been reprinted in Fig. 2 [41][42][43]50]. Here, we report on the effects of these particle mixtures on the pore size distribution, air content, and pore wall composition of the liquid foams and consolidated macroporous materials, and the degrees of shrinkage during processing.…”

Section: Introductionmentioning

confidence: 83%

“…The microstructural study presented here is based on materials made from binary mixtures of poly(vinylidene fluoride) (PVDF) and alumina (Al 2 O 3 ) suspensions. This is due in part to the extensive data available for foam systems stabilized solely by PVDF or surface-modified Al 2 O 3 particles [41,42,24,25,[35][36][37]. The contact angles formed between PVDF and ethanol-water solutions as well as those formed between Al 2 O 3 hydrophobized with valeric acid and water have been reported and have been reprinted in Fig.…”

Section: Introductionmentioning

confidence: 91%

“…Because particle-stabilized interfaces exhibit outstanding resistance to disproportionation and liquid membrane thinning [22][23][24][25][26][27][28], they are effective for producing macroporous materials from polymerizable solutions [29][30][31][32][33][34], and facilitate the consolidation of macroporous materials from a diverse range of particulate materials [35][36][37][38][39][40][41][42]. In an earlier letter [43], techniques for consolidating macroporous materials from discrete polymeric and ceramic particles were combined to create macroporous composite materials from liquid foams stabilized by binary mixtures of particles.…”

Section: Introductionmentioning

confidence: 99%

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Engineering macroporous composite materials using competitive adsorption in particle-stabilized foams

Wong

Tervoort

Busato

et al. 2012

Journal of Colloid and Interface Science

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“…The versatility of this method for porous ceramics synthesis is due to its simplicity, ease of reproducibility, and low cost [25,26]. The direct foaming process was applied to synthesize porous Al 2 TiO 5 , with the use of Al 2 O 3 and TiO 2 as raw materials, ZrO 2 /SiO 2 of 1:1 mole ratio for the ZrSiO 4 phase.…”

Section: Introductionmentioning

confidence: 99%

Al2O3–TiO2/ZrO2–SiO2 based porous ceramics from particle-stabilized wet foam

et al. 2017

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Abstract:The porous ceramics based on Al 2 O 3 -TiO 2 /ZrO 2 -SiO 2 from particle-stabilized wet foam by direct foaming were discussed. The initial Al 2 O 3 -TiO 2 suspension was prepared by adding TiO 2 suspension to partially hydrophobized colloidal Al 2 O 3 suspension with equimolar amount, to form Al 2 TiO 5 on sintering. The secondary ZrO 2 -SiO 2 suspension was prepared using the equimolar composition, and to obtain ZrSiO 4 , ZrTiO 4 , and mullite phases in the sintered samples, the secondary suspension was blended into the initial suspension at 0, 10, 20, 30, and 50 vol%. The wet foam exhibited an air content up to 87%, Laplace pressure from 1.38 to 2.23 mPa, and higher adsorption free energy at the interface of approximately 5.8×10 8 to 7.5×10 8 J resulting an outstanding foam stability of 87%. The final suspension was foamed, and the wet foam was sintered from 1400 to 1600 ℃ for 1 h. The porous ceramics with pore size from 150 to 400 μm on average were obtained. The phase identification was accomplished using X-ray diffraction (XRD), differential thermal analysis (DTA), and thermogravimetric analysis (TGA), and microstructural analysis was performed using field emission scanning electron microscopy (FESEM).

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Designing macroporous polymers from particle-stabilized foams

Cited by 41 publications

References 34 publications

Porous Ceramics

Porous Ceramics

Engineering macroporous composite materials using competitive adsorption in particle-stabilized foams

Al2O3–TiO2/ZrO2–SiO2 based porous ceramics from particle-stabilized wet foam

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