Effect of iron acetylacetonate on physico-chemical properties of waterglass based aerogels by ambient pressure drying |
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Authors: | A Venkateswara Rao Uzma K H Bangi Sunetra L Dhere Hiroaki Imai Hiroshi Hirashima |
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Institution: | (1) Air Glass Laboratory, Department of Physics, Shivaji University, Kolhapur, Maharashtra, 416004, India;(2) Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1, Hiyoshi, Kohoku-Ku, Yokohama 223-8522, Japan |
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Abstract: | The effect of iron acetylacetonate on the physico-chemical properties of waterglass based silica aerogels by ambient pressure
drying has been investigated. Doping the gels with iron acetylacetonat (FeAA) facilitates in the diminution of the density
of the aerogels. The well established silica network provides effective confinement of FeAA nanoparticles which resists the
collapse of silica network during ambient pressure drying. Therefore, in the present paper, the effects of FeAA on the physico-chemical
properties of the aerogels have been studied by varying the FeAA:Na2SiO3 molar ratio from 3 × 10−4 to 6 × 10−4. The aerogels were prepared via ambient pressure drying and characterized by the bulk density, thermal conductivity and water
contact angle. The aerogel’s surface morphology, elemental analysis and pore structure were characterized by means of EDAX
and FTIR, TEM and N2 adsorption- desorption analyzer. The high temperature hydrophobicity of these aerogels was checked by heating them in temperature
controlled furnace. Silica aerogels with low density ~0.050 g/cc have been obtained using the molar ratio of Na2SiO3:H2O:FeAA:Citric acid:TMCS at 1:146.67:3 × 10−4:0.54:9.46, respectively. EDAX and FTIR studies show that the iron species are entrapped in the mesoporous framework and not
took part in the bonding with silica. |
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