Chu Yingying, Sun Ling, Wang Jing, Han Zhaoyang, Wei Chenyu, Han Changbao, Yan Hui
Key Laboratory of Advanced Functional Materials, Institute of Advanced Energy Materials and Devices, Ministry of Education, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China.
Beijing Guyue New Materials Research Institute, Beijing University of Technology, Beijing 100124, China.
Nanomaterials (Basel). 2024 May 22;14(11):911. doi: 10.3390/nano14110911.
With the intensification of global climate problems, electric heating has recently attracted much attention as a clean and low-carbon heating method. Carbon nanotubes (CNTs) are an ideal medium for electric heating applications due to their excellent mechanical, electrical, and thermal properties. The preparation of electrothermal films based on an aqueous CNT dispersion as a raw material is environmentally friendly. However, in the traditional one-step filtration method, the residual excess dispersant and the small aspect ratio of the CNTs in the preparation process limit the performance of electrothermal CNT films. In this paper, we report a two-step filtration method that removes the free dispersant and small CNTs in the first filtration step and obtains denser CNT films by controlling the pores of the filter membrane in the second filtration step. The results suggest that, compared to the CNT film obtained from one-step filtration, the CNT film, obtained from two-step filtration using 1 and 0.22 μm membranes, has a smoother and flatter surface, and the surface resistance is 80.0 Ω sq, which is 29.4% lower. The convective radiation conversion efficiency of the CNT film is 3.36 mW/°C, which is 36.1% lower. We anticipate that such CNT films could be widely applied in building thermal insulation and underfloor heating.
随着全球气候问题的加剧,电加热作为一种清洁低碳的供暖方式,近来备受关注。碳纳米管(CNTs)因其优异的机械、电学和热学性能,是电加热应用的理想介质。以碳纳米管水分散液为原料制备电热膜具有环境友好性。然而,在传统的一步过滤法中,制备过程中残留的过量分散剂以及碳纳米管的小长径比限制了碳纳米管电热膜的性能。本文报道了一种两步过滤法,第一步过滤去除游离分散剂和小尺寸碳纳米管,第二步过滤通过控制滤膜孔径获得更致密的碳纳米管膜。结果表明,与一步过滤得到的碳纳米管膜相比,使用1μm和0.22μm滤膜两步过滤得到的碳纳米管膜表面更光滑平整,表面电阻为80.0Ω/sq,降低了29.4%。碳纳米管膜的对流辐射转换效率为3.36mW/°C,降低了36.1%。我们预计这种碳纳米管膜可广泛应用于建筑保温和地板采暖。