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http://hdl.handle.net/10397/34109
Title: | Temperature-dependent gas transport performance of vertically aligned carbon nanotube/parylene composite membranes | Authors: | Zhang, L Yang, J Wang, X Zhao, B Zheng, G |
Issue Date: | 2014 | Source: | Nanoscale research letters, 2014, v. 9, 448, p. 1-8 | Abstract: | A novel composite membrane consisting of vertically aligned carbon nanotubes (CNTs) and parylene was successfully fabricated. Seamless filling of the spaces in CNT forests with parylene was achieved by a low-pressure chemical vapor deposition (CVD) technique and followed with the Ar/O2 plasma etching to expose CNT tips. Transport properties of various gases through the CNT/parylene membranes were explored. And gas permeances were independent on feed pressure in accordance with the Knudsen model, but the permeance values were over 60 times higher than that predicted by the Knudsen diffusion kinetics, which was attributed to specular momentum reflection inside smooth CNT pores. Gas permeances and enhancement factors over the Knudsen model firstly increased and then decreased with rising temperature, which confirmed the existence of non-Knudsen transport. And surface adsorption diffusion could affect the gas permeance at relatively low temperature. The gas permeance of the CNT/parylene composite membrane could be improved by optimizing operating temperature. | Keywords: | Carbon nanotube Composite membrane Gas transport Parylene |
Publisher: | Springer New York LLC | Journal: | Nanoscale Research Letters | ISSN: | 1931-7573 | DOI: | 10.1186/1556-276X-9-448 | Rights: | © 2014 Zhang et al.; licensee Springer. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproductionin any medium, provided the original work is properly credited. The following publication Zhang, L., Yang, J., Wang, X., Zhao, B., & Zheng, G. (2014). Temperature-dependent gas transport performance of vertically aligned carbon nanotube/parylene composite membranes. Nanoscale Research Letters, 9, 448, 1-8 is available at https://dx.doi.org/10.1186/1556-276X-9-448 |
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