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

Liu, Yuan; Wang, Xiuzhang; Wang, Yumei; Tang, Zhongjia; Makarenko, Tatyana; Guloy, Arnold; Zhang, Qinyong; Ren, Zhifeng

doi:10.1063/1.4943626

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

Journal Article · Thu Mar 10 00:00:00 EST 2016 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4943626· OSTI ID:1468744

Liu, Yuan ^[1]; Wang, Xiuzhang ^[2]; Wang, Yumei ^[3]; Tang, Zhongjia ^[4]; Makarenko, Tatyana ^[4]; Guloy, Arnold ^[4]; Zhang, Qinyong ^[5]; Ren, Zhifeng ^[1]

Univ. of Houston, Houston, TX (United States). Dept. of Physics and TcSUH
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
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
Univ. of Houston, Houston, TX (United States). Dept. of Chemistry
Xihua Univ., Chengdu, Sichuan (China). Center for Advanced Materials and Energy

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.

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Research Organization:: Univ. of Houston, TX (United States)

Sponsoring Organization:: USDOE Office of Science (SC); National Natural Science Foundation of China (NSFC)

Grant/Contract Number:: SC0010831; 51372208; 51572226

OSTI ID:: 1468744

Alternate ID(s):: OSTI ID: 1241415

Journal Information:: Applied Physics Letters, Vol. 108, Issue 10; ISSN 0003-6951

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 5 works

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