Park, Sung Kwon, Young-Pil Kwon, Hyuk-Chon Lee, Hae-Weon Lee, Jae Chun 2024-01-20T22:34:23Z 2024-01-20T22:34:23Z 2021-09-03 2008-10 1533-4880 https://pubs.kist.re.kr/handle/201004/133126 Nano-sized fumed silica-based insulation media were prepared by adding TiO2 powders and ceramic fibers as opacifiers and structural integrity improvers, respectively. The high temperature thermal conductivities of the fumed silica-based insulation media were investigated using different types of TiO2 opacifier and by varying its content. The opacifying effects of nanostructured TiO2 powders produced by homogeneous precipitation process at low temperatures (HPPLT) were compared with those of commercial TiO2 powder. The nanostructured HPPLT TiO2 powder with a mean particle size of 1.8 mu m was more effective to reduce radiative heat transfer than the commercial one with a similar mean particle size. The insulation samples with the HPPLT TiO2 powder showed about 46% lower thermal conductivity at temperatures of about 820 degrees C than those with the commercial one. This interesting result might be due to the more effective radiation scattering efficiency of the nanostructured HPPLT TiO2 powder which has better gap filling and coating capability in nano-sized composite compacts. English AMER SCIENTIFIC PUBLISHERS TIO2 POWDER PRECIPITATION OXIDATION Effect of Composition on Thermal Conductivity of Silica Insulation Media Article 10.1166/jnn.2008.1130 1 JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, v.8, no.10, pp.5052 - 5056 JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY 8 10 5052 5056 scie scopus 000261390500029 2-s2.0-58149232479 Chemistry, Multidisciplinary Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Science & Technology - Other Topics Materials Science Physics Article; Proceedings Paper TIO2 POWDER PRECIPITATION OXIDATION Fumed Silica Thermal Insulation Ceramic Fiber Nanostructured Titania Opacifer