期刊
AICHE JOURNAL
卷 68, 期 4, 页码 -出版社
WILEY
DOI: 10.1002/aic.17581
关键词
glycerol aqueous solutions; hydrogen bond; microphase separation; microstructure; molecular dynamics simulations; superlubrication
资金
- National Science Foundation of China [21878144, 21838004, 21921006]
- Swedish Research Council [2019-04941]
- Postgraduate Research & Practice Innovation Program of Jiangsu Province [KYCX20_1023]
- Svenska Forskningsradet Formas [2019-00904]
- Swedish Research Council [2019-04941] Funding Source: Swedish Research Council
- Formas [2019-00904] Funding Source: Formas
Molecular dynamics simulations reveal that the friction coefficient of glycerol aqueous solutions confined in nanoslits shows a nonlinear variation with increasing water content, with differences in lubrication behavior between hydrophobic graphene and hydrophilic FeO nanoslits primarily due to distinctive microstructures induced by surfaces with different hydrophilicity.
Molecular dynamics simulations are performed to investigate the solid surface-induced microstructure and friction coefficient of glycerol aqueous solutions with different water contents confined in graphene and FeO nanoslits. Results show that the friction coefficient of glycerol aqueous solutions confined in both nanoslits presents similar nonlinear variation tendencies with increasing water content, but their lowest value and the corresponding water contents differ. Distinctive microstructures of the near-surface liquid layer induced by surfaces with different hydrophilicity are responsible for their difference in lubrication. The sliding primarily occurs at the solid-liquid interface for the hydrophobic graphene nanoslit owing to almost the same velocity difference in fluid molecules. By contrast, the sliding mainly occurs at the liquid-liquid interface for the hydrophilic FeO nanoslit because of the large velocity difference in fluid molecules. The weaker the interaction force at the sliding position, the lower the friction coefficient.
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