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Stability of Graphene Oxide Composite Membranes in an Aqueous Environment from a Molecular Point of View. APPLIED SCIENCES-BASEL 2022. [DOI: 10.3390/app12073460] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
We used molecular dynamics to investigate the stability of graphene oxide (GO) layers supported on three polymeric materials, namely a polyvinylidene fluoride (PVDF), a pristine and a crosslinked polyamide–imide (PAI and PAI-cr). The membrane configurations consisted of a few layers of GO nanosheets stacked over the specified polymeric supports and submerged in water. We monitored the position, the tilt angle, and the radial distribution function of the individual GO nanosheets in respect to the plane of the supports. We showed that the outermost GO nanosheets were more distorted than those attached directly on the supports. The greatest distortion was observed for the GO nanosheets of the PVDF-supported system. Next, we recorded the density profiles of the water molecules across the distance from the layers to the polymer and discussed the hydrogen bonds between water hydrogens and the oxygen atoms of the GO functional groups.
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Zhang Z, Fuoco A, He G. Membranes for Gas Separation. MEMBRANES 2021; 11:membranes11100755. [PMID: 34677521 PMCID: PMC8540389 DOI: 10.3390/membranes11100755] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 09/27/2021] [Accepted: 09/28/2021] [Indexed: 11/16/2022]
Affiliation(s)
- Zhien Zhang
- Department of Chemical and Biomedical Engineering, West Virginia University, Morgantown, WV 26506, USA
- Correspondence:
| | - Alessio Fuoco
- Institute on Membrane Technology, National Research Council of Italy (CNR-ITM), via P. Bucci 17/C, 87036 Rende, CS, Italy;
| | - Guangwei He
- School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, China;
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02142, USA
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