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Nanoscale liquid crystal lubrication controlled by surface structure and film composition
Jana, Pritam Kumar1; Chen, Wei2; Alava, Mikko J.1; Laurson, Lasse1
2018-07-21
Source PublicationPHYSICAL CHEMISTRY CHEMICAL PHYSICS
ISSN1463-9076
Volume20Issue:27Pages:18737-18743
Abstract

Liquid crystals have emerged as potential candidates for next-generation lubricants due to their tendency to exhibit long-range ordering. Here, we construct a full atomistic model of 4-cyano-4-hexylbiphenyl (6CB) nematic liquid crystal lubricants mixed with hexane and confined by mica surfaces. We explore the effect of the surface structure of mica, as well as lubricant composition and thickness, on the nanoscale friction in the system. Our results demonstrate the key role of the structure of the mica surfaces, specifically the positions of potassium (K+) ions, in determining the nature of sliding friction with monolayer lubricants, including the presence or absence of stick-slip dynamics. With the commensurate setup of confining surfaces, when the grooves created between the periodic K+ ions are parallel to the sliding direction we observe a lower friction force as compared to the perpendicular situation. Random positions of ions exhibit even smaller friction forces with respect to the previous two cases. For thicker lubrication layers the surface structure becomes less important and we observe a good agreement with the experimental data on bulk viscosity of 6CB and the additive hexane. In case of thicker lubrication layers, friction may still be controlled by tuning the relative concentrations of 6CB and hexane in the mixture.

DOI10.1039/c8cp03353f
Language英语
WOS KeywordStick-slip Friction ; Molecular-dynamics Simulations ; Thin-films ; Tribological Properties ; N-cyanobiphenyls ; Nematic Phases ; Electric-field ; Mica Surfaces ; Shear ; Orientation
Funding ProjectAcademy of Finland[251748] ; Academy of Finland FiDiPro program[13282993] ; Academy of Finland via an Academy Research Fellowship[268302] ; National Natural Science Foundation of China[11504384]
WOS Research AreaChemistry ; Physics
WOS SubjectChemistry, Physical ; Physics, Atomic, Molecular & Chemical
Funding OrganizationAcademy of Finland ; Academy of Finland FiDiPro program ; Academy of Finland via an Academy Research Fellowship ; National Natural Science Foundation of China
WOS IDWOS:000441089800062
PublisherROYAL SOC CHEMISTRY
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/25670
Collection中国科学院过程工程研究所
Corresponding AuthorJana, Pritam Kumar
Affiliation1.Aalto Univ, Dept Appl Phys, COMP Ctr Excellence, POB 11100, FI-00076 Espoo, Finland
2.Chinese Acad Sci, IPE, State Key Lab Multiphase Complex Syst, Beijing 100190, Peoples R China
Recommended Citation
GB/T 7714
Jana, Pritam Kumar,Chen, Wei,Alava, Mikko J.,et al. Nanoscale liquid crystal lubrication controlled by surface structure and film composition[J]. PHYSICAL CHEMISTRY CHEMICAL PHYSICS,2018,20(27):18737-18743.
APA Jana, Pritam Kumar,Chen, Wei,Alava, Mikko J.,&Laurson, Lasse.(2018).Nanoscale liquid crystal lubrication controlled by surface structure and film composition.PHYSICAL CHEMISTRY CHEMICAL PHYSICS,20(27),18737-18743.
MLA Jana, Pritam Kumar,et al."Nanoscale liquid crystal lubrication controlled by surface structure and film composition".PHYSICAL CHEMISTRY CHEMICAL PHYSICS 20.27(2018):18737-18743.
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