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Title: Ultra-low thermal conductivities of hot-pressed attapulgite and its potential as thermal insulation material

Abstract

In the past, there have been very few reports on thermal properties of attapulgite which is a widely used clay mineral. In this work, we report on extremely low thermal conductivities in attapulgite samples synthesized by hot-pressing. Attapulgite powder was hot-pressed at different temperatures into bulk samples, and a systematic study was conducted on the microstructures and thermal properties. Differential scanning calorimetry analysis shows that hot-pressing induces a rapid dehydration of the attapulgite powders. X-ray diffraction data and scanning/transmission electron microscopy reveal that the hot-pressed attapulgite features high porosity and complex microstructures, including an amorphous phase. As a result, the hot-pressed attapulgite exhibits thermal conductivity less than 2.5 W m{sup −1} K{sup −1} up to 600 °C. For one sample with porosity of 45.7%, the thermal conductivity is as low as 0.34 W m{sup −1} K{sup −1} at 50 °C. This suggests the potential of hot-pressed attapulgite as a candidate for thermal barrier materials.

Authors:
;  [1];  [1];  [1]; ; ;  [2];  [3]
  1. Department of Physics and TcSUH, University of Houston, Houston, Texas 77204 (United States)
  2. Department of Chemistry, University of Houston, Houston, Texas 77204 (United States)
  3. Center for Advanced Materials and Energy, Xihua University, Chengdu, Sichuan 610039 (China)
Publication Date:
OSTI Identifier:
22591407
Resource Type:
Journal Article
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 108; Journal Issue: 10; Other Information: (c) 2016 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0003-6951
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; AMORPHOUS STATE; ATTAPULGITE; CALORIMETRY; DEHYDRATION; HOT PRESSING; MATERIALS; MICROSTRUCTURE; POROSITY; POWDERS; THERMAL BARRIERS; THERMAL CONDUCTIVITY; THERMAL INSULATION; TRANSMISSION ELECTRON MICROSCOPY; X-RAY DIFFRACTION

Citation Formats

Liu, Yuan, Ren, Zhifeng, Wang, Xiuzhang, Hubei Key Laboratory of Pollutant Analysis and Reuse Technology and School of Physics and Electronic Science, Hubei Normal University, Huangshi, Hubei 435002, Wang, Yumei, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, Tang, Zhongjia, Makarenko, Tatyana, Guloy, Arnold, and Zhang, Qinyong. Ultra-low thermal conductivities of hot-pressed attapulgite and its potential as thermal insulation material. United States: N. p., 2016. Web. doi:10.1063/1.4943626.
Liu, Yuan, Ren, Zhifeng, Wang, Xiuzhang, Hubei Key Laboratory of Pollutant Analysis and Reuse Technology and School of Physics and Electronic Science, Hubei Normal University, Huangshi, Hubei 435002, Wang, Yumei, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, Tang, Zhongjia, Makarenko, Tatyana, Guloy, Arnold, & Zhang, Qinyong. Ultra-low thermal conductivities of hot-pressed attapulgite and its potential as thermal insulation material. United States. doi:10.1063/1.4943626.
Liu, Yuan, Ren, Zhifeng, Wang, Xiuzhang, Hubei Key Laboratory of Pollutant Analysis and Reuse Technology and School of Physics and Electronic Science, Hubei Normal University, Huangshi, Hubei 435002, Wang, Yumei, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, Tang, Zhongjia, Makarenko, Tatyana, Guloy, Arnold, and Zhang, Qinyong. Mon . "Ultra-low thermal conductivities of hot-pressed attapulgite and its potential as thermal insulation material". United States. doi:10.1063/1.4943626.
@article{osti_22591407,
title = {Ultra-low thermal conductivities of hot-pressed attapulgite and its potential as thermal insulation material},
author = {Liu, Yuan and Ren, Zhifeng and Wang, Xiuzhang and Hubei Key Laboratory of Pollutant Analysis and Reuse Technology and School of Physics and Electronic Science, Hubei Normal University, Huangshi, Hubei 435002 and Wang, Yumei and Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190 and Tang, Zhongjia and Makarenko, Tatyana and Guloy, Arnold and Zhang, Qinyong},
abstractNote = {In the past, there have been very few reports on thermal properties of attapulgite which is a widely used clay mineral. In this work, we report on extremely low thermal conductivities in attapulgite samples synthesized by hot-pressing. Attapulgite powder was hot-pressed at different temperatures into bulk samples, and a systematic study was conducted on the microstructures and thermal properties. Differential scanning calorimetry analysis shows that hot-pressing induces a rapid dehydration of the attapulgite powders. X-ray diffraction data and scanning/transmission electron microscopy reveal that the hot-pressed attapulgite features high porosity and complex microstructures, including an amorphous phase. As a result, the hot-pressed attapulgite exhibits thermal conductivity less than 2.5 W m{sup −1} K{sup −1} up to 600 °C. For one sample with porosity of 45.7%, the thermal conductivity is as low as 0.34 W m{sup −1} K{sup −1} at 50 °C. This suggests the potential of hot-pressed attapulgite as a candidate for thermal barrier materials.},
doi = {10.1063/1.4943626},
journal = {Applied Physics Letters},
issn = {0003-6951},
number = 10,
volume = 108,
place = {United States},
year = {2016},
month = {3}
}