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    • Preparation of an efficient humidity indicating silica gel from rice husk ash

      J P Nayak J Bera

      Volume 34 Issue 7 December 2011 pp 1683-1687

    • Fulltext

       

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      Permanent link:
      https://www.ias.ac.in/article/fulltext/boms/034/07/1683-1687

    • Keywords

       

      Silica gel; humidity; rice husk ash; cobalt.

    • Abstract

       

      An efficient humidity indicating silica gel was prepared using rice husk ash as a raw material via sodium silicate extraction and acid neutralization method. Cobalt chloride was impregnated into the silica gel as a colour indicating material. A low concentration of cobalt chloride solution (0.0005 mol dm-3) was used for the impregnation. The effect of pH of the impregnating solution on the colour development behaviour of the gel was investigated. The specific surface area of the gel was determined by Brunauer–Emmett–Teller method. The gel has been characterized using X-ray diffraction, scanning electron microscopy and visible spectroscopy. The moisture adsorption and desorption kinetics of the desiccant were evaluated using simultaneous thermogravimetry and differential scanning calorimetry.

    • Author Affiliations

       

      J P Nayak1 J Bera1

      1. Department of Ceramic Engineering, National Institute of Technology, Rourkela 769 008, India

    • Dates

       
      Published
      December 2011
      Manuscript received
      6 May 2009
      Manuscript revised
      25 September 2010

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