文章信息/Info

Title:

Experimental Study on Thermal Conductivity of Carbon Nanotube Sponges

文章編號(hào):

1674-3962(2021)09-0722-07

作者:

劉心穎; 林歡; 董華

(青島理工大學(xué)環(huán)境與市政工程學(xué)院，山東 青島 266033）

Author(s):

LIU Xinying;  LIN Huan;  DONG Hua

(School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266033, China)

關(guān)鍵詞:

瞬態(tài)電熱測(cè)量技術(shù); 熱運(yùn)輸; 碳納米管海綿; 保溫材料; 導(dǎo)熱率

Keywords:

transient electro-thermal (TET) measurement technology; thermal transport; carbon nanotube sponges; thermal insulation material; thermal conductivity

分類號(hào):

TB383

DOI:

10.7502/j.issn.1674-3962.202005036

文獻(xiàn)標(biāo)志碼:

A

摘要:

為了實(shí)現(xiàn)資源可持續(xù)性發(fā)展，保溫材料的使用成為當(dāng)代社會(huì)生產(chǎn)節(jié)能的重要手段。基于碳納米管的三維宏觀體——碳納米管海綿，其立體空心網(wǎng)狀塔接結(jié)構(gòu)使得碳納米管海綿具有良好的保溫性能和熱穩(wěn)定性。顯然，碳納米管海綿的導(dǎo)熱性能實(shí)驗(yàn)研究可以為該新型材料的應(yīng)用提供相應(yīng)的數(shù)據(jù)支持，并且對(duì)滿足社會(huì)生產(chǎn)需求意義重大。通過(guò)實(shí)驗(yàn)室針對(duì)一維材料熱擴(kuò)散系數(shù)的表征方法——瞬態(tài)電熱（TET）測(cè)量技術(shù)，對(duì)碳納米管海綿材料進(jìn)行室溫下熱擴(kuò)散系數(shù)的測(cè)量，借助Schuetz多孔介質(zhì)導(dǎo)熱模型得到樣品的骨架導(dǎo)熱率為45～51 W·m-1·K-1，而真實(shí)導(dǎo)熱率達(dá)到了0.15 W·m-1·K-1。最后，從微尺度傳熱的角度解釋了碳納米管海綿的熱運(yùn)輸機(jī)理，并通過(guò)SEM照片證實(shí)了碳納米管海綿結(jié)構(gòu)缺陷會(huì)使得樣品表面聲子散落和接觸電阻增大，從而導(dǎo)致了碳納米管海綿的低導(dǎo)熱性能。

Abstract:

In order to achieve the sustainable development of resources, the use of thermal insulation materials has become an important means of energy conservation in contemporary society. Due to the three-dimensional (3D) porous network structure, carbon nanotube sponges (CNT sponges) have excellent thermal insulation performance and thermal stability. Obviously, the experimental study on thermal conductivity of CNT sponges will provide a favorable database for the application of this new thermal insulation material, which is of great significance to meet the needs of social production. Therefore, this paper reports on a thermal diffusivity of CNT sponges at room temperature using the transient electro-thermal (TET) measurement technology, and this measurement method is specially aimed at the thermal characterization of micro-nano scale materials. By Schuetz’s thermal conductivity model, the skeletal thermal conductivity of CNT sponges is determined at 45~51 W·m-1·K-1, and the real thermal conductivity reached 0.15 W·m-1·K-1. Finally, the thermal transport mechanism of CNT sponges was explained from the perspective of micro-scale heat transfer, and the SEM images proved that the structure defect of CNT sponges would bring about the influence of phonon scattering on the sample surface and the increase of contact resistance, thus resulting in the low thermal conductivity of CNT sponges.