Micro porous SiO&lt;sub&gt;2&lt;/sub&gt;&amp;ndash;SiC ceramics from particle stabilized foams by direct foaming

Bhaskar, Subhasree; Cho, Gae Hyung; Park, Jung Gyu; Kim, Seong Won; Kim, Hyun Jae; Kim, Ik Jin

doi:10.2109/jcersj2.123.378

Cited by 8 publications

(9 citation statements)

References 14 publications

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“…This is due to the increase in the excess air incorporation into the suspension; the bubbles tend to collapse, which leads to irreversible destabilization mechanisms like Ostwald ripening, drainage, and coalescence of the bubbles. 21) Hence, it can be interpreted that the air content of the colloidal suspension is inversely proportional to the wet foam stability of the porous ceramic foam. Figure 5 shows the wet foam stability, which corresponds to the Laplace pressure exerted by the bubbles of the wetfoams formed with respect to the particle concentration.…”

Section: Resultsmentioning

confidence: 99%

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Particle Stabilized Wet Foam to Prepare SiO<sub>2</sub>-SiC Porous Ceramics by Colloidal Processing

Bhaskar¹,

Park²,

Han³

et al. 2015

Journal of the Korean Ceramic Society

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Porous ceramics with tailored pore size and shape are promising materials for the realization of a number of functional and structural properties. A novel method has been reported for the investigation of the role of SiC in the formation of SiO 2 foams by colloidal wet processing. Within a suitable pH range of 9.9 ~ 10.5 SiO 2 , particles were partially hydrophobized using hexylamine as an amphiphile. Different mole ratios of the SiC solution were added to the surface modified SiO 2 suspension. The contact angle was found to be around 73°, with an adsorption free energy 6.8 × 10 −12 J. The Laplace pressure of about 1.25 ~ 1.6 mPa was found to correspond to a wet foam stability of about 80 ~ 85%. The mechanical and thermal properties were analyzed for the sintered ceramics, with the highest compressive load observed at the mole ratio of 1:1.75. Hertzian indentations are used to evaluate the damage behavior under constrained loading conditions of SiO 2-SiC porous ceramics.

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Section: Resultsmentioning

confidence: 99%

“…The adsorption of particles reduces the highly energetic interfacial area and lowers the free energy of the system. 21) Due to the oxidative properties of SiC, Ar gas atmosphere has been used for sintering of dried porous ceramics to overcome the several possible oxidation reactions, such as: 13,21) SiO 2 + nSiC + 3C → (n+1) SiC + CO…”

Section: Introductionmentioning

confidence: 99%

Particle Stabilized Wet Foam to Prepare SiO<sub>2</sub>-SiC Porous Ceramics by Colloidal Processing

Bhaskar¹,

Park²,

Han³

et al. 2015

Journal of the Korean Ceramic Society

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“…Porosity of the resulting ceramic is proportionate to the air content in the suspension after foaming (Bhaskar et al 2015):…”

Section: Direct Foamingmentioning

confidence: 99%

Synthesis of Macro Porous Ceramic Materials

Hanim

2021

Advanced Functional Porous Materials

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This chapter explored the synthesis method of macro porous ceramic by using the partial sintering, direct foaming, replica template and sacrificial template technique. The focus is to produce macro porosity in the ceramic for specific application purposes that required this porosity range. At first, fundamentals in each technique were discussed and the advancement in the topic for the recent five years was presented. This is followed by advantages and limitations existing with the current technology for each synthesizing technique. Finally, the chapter covers the possible future trends that can be explored in making the process of synthesizing macro porous ceramic to be more repeatable, stable and sustainable in the near future.

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“…The microstructures prove the decrease in pore size with the increase in particle concentration, as well as Ost- wald ripening, is seen in the 35 vol.% concentration, where the bubbles are found to agglomerate. 25,98,158)…”

Section: Sio 2 Based Porous Ceramicsmentioning

confidence: 99%

“…122) Furthermore, it can also be chemically modified for specific catalytic applications through the addition of promoters (oxides like SiO 2 , Al 2 O 3 , TiO 2 , ZrO 2 , carbides, and metals), rendering the fabrication simple and cost effective. 161,162) A novel method was developed by Liu et al to produce the pure silicon carbide foams via the high-temperature recrystallization with the presence of a novel foaming agent-SiO 2 , 158) and also threedimensional (3D) mesoporous SiC samples with highly ordered porosity were prepared using three different routes by Zorko et al. 163) Table 3 shows the bubble size of the suspension and the pore size by thin film or struts formed after the foaming of the particle stabilized suspension and sintering.…”

Section: Sic Porous Ceramicsmentioning

confidence: 99%

Wet Foam Stability from Colloidal Suspension to Porous Ceramics: A Review

Kim¹,

Park²,

Han³

et al. 2019

J. Korean Ceram. Soc

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Porous ceramics are promising materials for a number of functional and structural applications that include thermal insulation, filters, bio-scaffolds for tissue engineering, and preforms for composite fabrication. These applications take advantage of the special characteristics of porous ceramics, such as low thermal mass, low thermal conductivity, high surface area, controlled permeability, and low density. In this review, we emphasize the direct foaming method, a simple and versatile approach that allows the fabrication of porous ceramics with tailored microstructure, along with distinctive properties. The wet foam stability is achieved under the controlled addition of amphiphiles to the colloidal suspension, which induce in situ hydrophobization, allowing the wet foam to resist coarsening and Ostwald ripening upon drying and sintering. Different components, like contact angle, adsorption free energy, air content, bubble size, and Laplace pressure, play vital roles in the stabilization of the particle stabilized wet foam to the porous ceramics. The mechanical behavior of the load-displacements curves of sintered samples was investigated using Herzian indentations testes. From the collected results, we found that microporous structures with pore sizes from 30 µm to 570 µm and the porosity within the range from 70% to 85%.

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Micro porous SiO<sub>2</sub>–SiC ceramics from particle stabilized foams by direct foaming

Cited by 8 publications

References 14 publications

Particle Stabilized Wet Foam to Prepare SiO<sub>2</sub>-SiC Porous Ceramics by Colloidal Processing

Particle Stabilized Wet Foam to Prepare SiO<sub>2</sub>-SiC Porous Ceramics by Colloidal Processing

Synthesis of Macro Porous Ceramic Materials

Wet Foam Stability from Colloidal Suspension to Porous Ceramics: A Review

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