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

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 2.5Wm -1K -1 up to 600 °C. For one sample with porosity of 45.7%, the thermal conductivity is as low as 0.34Wm -1K -1 at 50 °C. Finally, this suggests the potential of hotpressed attapulgite as a candidate for thermal barrier materials.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [4] ;  [4] ;  [5] ;  [1]
  1. Univ. of Houston, Houston, TX (United States). Dept. of Physics and TcSUH
  2. Univ. of Houston, Houston, TX (United States). Dept. of Physics and TcSUH; Hubei Normal Univ., Huangshi, Hubei (China). Hubei Key Lab. of Pollutant Analysis and Reuse Technology and School of Physics and Electronic Science
  3. Univ. of Houston, Houston, TX (United States). Dept. of Physics and TcSUH; Chinese Academy of Sciences (CAS), Beijing (China). Beijing National Lab. for Condensed Matter Physics, Inst. of Physics
  4. Univ. of Houston, Houston, TX (United States). Dept. of Chemistry
  5. Xihua Univ., Chengdu, Sichuan (China). Center for Advanced Materials and Energy
Publication Date:
Grant/Contract Number:
SC0010831; 51372208; 51572226
Type:
Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 108; Journal Issue: 10; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
Research Org:
Univ. of Houston, Houston, TX (United States)
Sponsoring Org:
USDOE Office of Science (SC); National Natural Science Foundation of China (NNSFC)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE
OSTI Identifier:
1468744
Alternate Identifier(s):
OSTI ID: 1241415

Liu, Yuan, Wang, Xiuzhang, Wang, Yumei, Tang, Zhongjia, Makarenko, Tatyana, Guloy, Arnold, Zhang, Qinyong, and Ren, Zhifeng. Ultra-low thermal conductivities of hot-pressed attapulgite and its potential as thermal insulation material. United States: N. p., Web. doi:10.1063/1.4943626.
Liu, Yuan, Wang, Xiuzhang, Wang, Yumei, Tang, Zhongjia, Makarenko, Tatyana, Guloy, Arnold, Zhang, Qinyong, & Ren, Zhifeng. Ultra-low thermal conductivities of hot-pressed attapulgite and its potential as thermal insulation material. United States. doi:10.1063/1.4943626.
Liu, Yuan, Wang, Xiuzhang, Wang, Yumei, Tang, Zhongjia, Makarenko, Tatyana, Guloy, Arnold, Zhang, Qinyong, and Ren, Zhifeng. 2016. "Ultra-low thermal conductivities of hot-pressed attapulgite and its potential as thermal insulation material". United States. doi:10.1063/1.4943626. https://www.osti.gov/servlets/purl/1468744.
@article{osti_1468744,
title = {Ultra-low thermal conductivities of hot-pressed attapulgite and its potential as thermal insulation material},
author = {Liu, Yuan and Wang, Xiuzhang and Wang, Yumei and Tang, Zhongjia and Makarenko, Tatyana and Guloy, Arnold and Zhang, Qinyong and Ren, Zhifeng},
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 2.5Wm-1K-1 up to 600 °C. For one sample with porosity of 45.7%, the thermal conductivity is as low as 0.34Wm-1K-1 at 50 °C. Finally, this suggests the potential of hotpressed attapulgite as a candidate for thermal barrier materials.},
doi = {10.1063/1.4943626},
journal = {Applied Physics Letters},
number = 10,
volume = 108,
place = {United States},
year = {2016},
month = {3}
}