AI Article Synopsis
- Repulsive osmotic delamination is a process that allows the "dissolution" of 2D materials, helping to create monolayered nanosheets more efficiently than traditional liquid-phase exfoliation.
- Previous methods were limited to water-based solutions, which excluded certain materials like alkali-metal intercalation compounds.
- Researchers have now successfully adapted osmotic delamination to work with organic solvents, using crown ethers to achieve the necessary separation of layers in various water-free solvents.
Article Abstract
Repulsive osmotic delamination is thermodynamically allowed "dissolution" of two-dimensional (2D) materials and therefore represents an attractive alternative to liquid-phase exfoliation to obtain strictly monolayered nanosheets with an appreciable aspect ratio with quantitative yield. However, osmotic delamination was so far restricted to aqueous media, severely limiting the range of accessible 2D materials. Alkali-metal intercalation compounds of MoS or graphite are excluded because they cannot tolerate even traces of water. We now succeeded in extending osmotic delamination to polar and aprotic organic solvents. Upon complexation of interlayer cations of synthetic hectorite clay by crown ethers, either 15-crown-5 or 18-crown-6, steric pressure is exerted, which helps in reaching the threshold separation required to trigger osmotic delamination based on translational entropy. This way, complete delamination in water-free solvents like aprotic ethylene and propylene carbonate, -methylformamide, -methylacetamide, and glycerol carbonate was achieved.
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| http://dx.doi.org/10.1021/acs.langmuir.0c03113 | DOI Listing |
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