Enhanced Condensation, Agglomeration, and Rejection of Water Vapor by Superhydrophobic Aligned Multiwalled Carbon Nanotube Membranes

Autor:	Jongju Yun, Seunghyun Baik, Bong Jun Cha, Wonjae Jeon, Cheesung Lee, Dokyung Yoon
Rok vydání:	2012
Předmět:	Nanotube Materials science Economies of agglomeration Condensation General Engineering General Physics and Astronomy Nanotechnology Orders of magnitude (numbers) Membrane Chemical engineering Molecule General Materials Science Selectivity Water vapor
Zdroj:	ACS Nano. 6:5980-5987
ISSN:	1936-086X 1936-0851
DOI:	10.1021/nn3008756
Popis:	The separation of gas molecules and water vapor has become increasingly important for electronic, energy, and environmental systems. Here we demonstrate a new mechanism of enhanced condensation, agglomeration, and rejection of water vapor by superhydrophobic aligned multiwalled carbon nanotubes with the intertube distance of 73 nm, channel aspect ratio of ~5.5 × 10(4), and tortuosity of 1.157. The array with the characteristic channel dimension some 300 times greater than the target molecule size effectively suppressed water molecular transport at room temperature with the selectivity as high as ~2 × 10(5) (H(2)/H(2)O). The flow through the interstitial space of nanotubes allowed high permeability of other gas molecules (2.1 × 10(-9) to 3.8 × 10(-8) mol · m/m(2) · s · Pa), while retaining high selectivity, which is orders of magnitude greater than the permeate flux of polymeric membranes used for the water-gas mixture separation. This new separation mechanism with high selectivity and permeate flux, enabled by the unique geometry of aligned nanotubes, can provide a low-energy and cost-effective method to control humidity.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6edbd651c02b2d969701b091989e0ae7 https://doi.org/10.1021/nn3008756 Zobrazit plný text záznamu