Mesoporous RF-Xerogels by Facile Hydrothermal Synthesis

Authors

  • Sakhon Ratchahat Tokyo Institute of Technology
  • Satoshi Kodama Tokyo Institute of Technology
  • Hidetoshi Sekiguchi Tokyo Institute of Technology
  • Wiwut Tanthapanichakoon Tokyo Institute of Technology
  • Khalid Al-Ali Masdar Institute of Science and Technology
  • Tawatchai Charinpanitkul Chulalongkorn University
  • Apinan Soottitantawat Chulalongkorn University
  • Apiluck Eiad-Ua King Mongkut's Institute of Technology Ladkrabang
  • Kajornsak Faungnawakij National Nanotechnology Center (NANOTEC)

DOI:

https://doi.org/10.4186/ej.2015.19.3.95

Keywords:

Mesoporous materials, RF xerogels, hydrothermal process.

Abstract

Mesoporous resorcinol-formaldehyde (RF) xerogels were difficult to obtain by conventional sol-gel polymerization at atmospheric pressure because the resulting tenuous RF-gel structures tended to shrink or collapse during subsequent hot-air drying. To avoid this problem, costly and energy-intensive supercritical drying and freeze-drying are often used. In this work the main goal was to produce high-quality RF xerogels with good mesoporosity and high surface area by employing a hydrothermal process. The hydrogel synthesis was carried out in an autoclave at elevated temperature and pressure in order to sufficiently strengthen its network structure. The initial reactant ratio was held constant to search for most suitable hydrothermal temperature and initial pH. The experimental results showed that the reaction in the autoclave at 140ºC and initial pH of 6 could successfully produce RF xerogels with good mesoporosity (peaking pore radius rpeak = 2.38 nm), high specific surface area and large pore volume. The hydrothermal process was on the overall relatively simple, low-cost, and less time-consuming compared to the conventional atmospheric method.

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Author Biographies

Sakhon Ratchahat

Department of Chemical Engineering, Tokyo Institute of Technology, Tokyo 152-8550, Japan

Satoshi Kodama

Department of Chemical Engineering, Tokyo Institute of Technology, Tokyo 152-8550, Japan

Hidetoshi Sekiguchi

Department of Chemical Engineering, Tokyo Institute of Technology, Tokyo 152-8550, Japan

Wiwut Tanthapanichakoon

Department of Chemical Engineering, Tokyo Institute of Technology, Tokyo 152-8550, Japan

Khalid Al-Ali

Department of Chemical and Environmental Engineering, Masdar Institute of Science and Technology, Abu Dhabi, United Arab Emirates

Tawatchai Charinpanitkul

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

Apinan Soottitantawat

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

Apiluck Eiad-Ua

College of Nanotechnology, King Mongkut's Institute of Technology Ladkrabang, Bangkok 10520, Thailand

Kajornsak Faungnawakij

National Nanotechnology Center (NANOTEC), NSTDA, Patumthani 12120, Thailand

Published

Vol 19 No 3, May 28, 2015

How to Cite

[1]
S. Ratchahat, “Mesoporous RF-Xerogels by Facile Hydrothermal Synthesis”, Eng. J., vol. 19, no. 3, pp. 95-104, May 2015.

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