• Title/Summary/Keyword: inorganic materials

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Stabilization of Wet Foams for Porous Ceramics Using Amphiphilic Particles

  • Pokhrel, Ashish;Park, Jung-Gyu;Nam, Jeong-Sic;Cheong, Deock-Soo;Kim, Ik-Jin
    • Journal of the Korean Ceramic Society
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    • v.48 no.5
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    • pp.463-466
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    • 2011

  • Wet foams formed through direct foaming were stabilized using various concentrations of amiphiphilic particles that could control pore size and porosity. These porous materials showed moderate strength upon compression with high porosity. Bubble size and wet foam stability were tailored by amphiphile concentration, particle concentration, contact angle, and pH of the suspension to obtain crack-free porous solid after sintering. Closed and open pores were obtained with sizes of 30~300 ${\mu}m$ and porosities of over 80%.

  • https://doi.org/10.4191/kcers.2011.48.5.463 인용 PDF KSCI

Controlling the Porosity of Particle Stabilized Al2O3 Based Ceramics

  • Pokhrel, Ashish;Park, Jung-Gyu;Jho, Gae-Hyong;Kim, Jin-Young;Kim, Ik-Jin
    • Journal of the Korean Ceramic Society
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    • v.48 no.6
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    • pp.600-603
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    • 2011

  • The microstructure of particle stabilized wet foams can be tailored by using parameters including the amphiphile concentration, contact angle, and surface tension. The influence of these parameters on the porosity is satisfactorily described in terms of a combined influence of the contact angle and surface tension of the initial suspensions that are directly affected by the amphiphile concentration. The resulting macroporous structures exhibited a total porosity of 82%. The foam cells were predominantly closed due to the air bubbles of the original wet foams being completely covered.

  • https://doi.org/10.4191/kcers.2011.48.6.600 인용 PDF KSCI