Synthesis of Porous Materials and Their Microstructural Control through Ice Templating

Authors

  • Wiwut Tanthapanichakoon Tokyo Institute of Technology
  • Hajime Tamon Kyoto University
  • Kyuya Nakagawa University of Hyogo
  • Tawatchai Charinpanitkul Chulalongkorn University

DOI:

https://doi.org/10.4186/ej.2013.17.3.1

Keywords:

Porous material, ice templating, microhoneycomb, microfiber, CNT.

Abstract

Ice-templating is a simple, practical kind of template synthesis which consists of sol-gel polycondensation, unidirectional freezing of hydrosols or hydrogels, and pore-preserving drying method, such as freeze drying, thereby resulting in desirable porous materials. The unidirectional freezing may be achieved by either immersion freezing or contact freezing. Freeze-dried materials contain porous microstructures that are replicas of the ice crystals formed during the unidirectional freezing process. Two similar but slightly different applications of ice-templating will be investigated here. Fabrication of macroporous foam materials by unidirectional freezing of an aqueous suspension of carbon nanotubes (CNTs) dispersed by chitosan is a concrete example of functionalization of an electroconductive foam, which is a composite material made from a polymer and CNTs. As expected, their electroconductive properties can be controlled by the fabrication method and condition. Additional examples of porous materials synthesized by ice-templating are porous microfibers and microhoneycombs of silica, titania, silica-alumina, titania-silica, and even carbon. In the preparation, the morphology and porous structure can be controlled by the freezing conditions and synthesis conditions of the corresponding hydrogels, respectively.

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Author Biographies

Wiwut Tanthapanichakoon

Department of Chemical Engineering, Graduate School of Science and Engineering, Tokyo Institute of Technology, Tokyo 152-8550, Japan

Hajime Tamon

Department of Chemical Engineering, Kyoto University, Katsura, Kyoto 615-8510, Japan

Kyuya Nakagawa

Research Center for Nano-Micro Structure Science and Engineering, Graduate School of Engineering, University of Hyogo, 2167 Shosha, Himeji, Hyogo 671-2280, Japan

Tawatchai Charinpanitkul

Center of Excellence in Particle Technology, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, Thailand

Published

Vol 17 No 3, Apr 3, 2013

How to Cite

[1]
W. Tanthapanichakoon, H. Tamon, K. Nakagawa, and T. Charinpanitkul, “Synthesis of Porous Materials and Their Microstructural Control through Ice Templating”, Eng. J., vol. 17, no. 3, pp. 1-8, Apr. 2013.

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