Shear-induced assembly of high-aspect-ratio graphene nanoribbon nanosheets in a confined microchannel: Membrane fabrication for ultrafast organic solvent nanofiltration
- Authors
- Kim, Ji Hoon; Choi, Yunkyu; Kang, Junhyeok; Kim, Ju Yeon; Bae, Jun Hyuk; Kwon, Ohchan; Kim, Dae Woo
- Issue Date
- May-2022
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- Graphene nanoribbon; Self-assembly; Slot-die coating; Nano filtration; Nanosheet
- Citation
- CARBON, v.191, pp 563 - 570
- Pages
- 8
- Journal Title
- CARBON
- Volume
- 191
- Start Page
- 563
- End Page
- 570
- URI
- https://yscholarhub.yonsei.ac.kr/handle/2021.sw.yonsei/6569
- DOI
- 10.1016/j.carbon.2022.02.026
- ISSN
- 0008-6223
1873-3891
- Abstract
- One-dimensional graphene oxide nanoribbons (GONRs) were self-assembled into two-dimensional (2D) nanosheets using the shear and confinement effect during a slot-die coating process. An aqueous GONR suspension comprising nanostrings made of entangled GONRs at a concentration of 5 mg/mL was used. When the GONR suspension was injected into the microchannel of the slot-die coater, the GONR nanostrings self-assembled to form a nanosheet. The thickness of the GONR nanosheet could be controlled at the nanometer scale by adjusting the injection rate of the GONR suspension into the slot-die head, and the lateral dimension of the nanosheet was in the range of several tens of micrometers. The GONR nanosheets could be directly and continuously coated on a porous polymer support by the slot-die coating method. In particular, a 40-nm-thick GONR layer exhibited ultrafast organic solvent nano-filtration (OSN) with an isopropyl alcohol permeance of 679 LMH/bar and molecular weight cut-off of 961 Da, substantially surpassing the upper limit of the OSN performances of polymeric and 2D-material-based membranes. Highly efficient diafiltration of mixed organic molecules in an organic solvent is also feasible using this GONR membrane. (c) 2022 Elsevier Ltd. All rights reserved.
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