IMECH-IR  > 非线性力学国家重点实验室
Phase transitions of a water overlayer on charged graphene: from electromelting to electrofreezing
Zhu XY; Yuan QZ(袁泉子); Zhao YP(赵亚溥); Zhao, YP (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China.
Source PublicationNANOSCALE
2014
Volume6Issue:10Pages:5432-5437
ISSN2040-3364
AbstractWe show by using molecular dynamics simulations that a water overlayer on charged graphene experiences first-order ice-to-liquid (electromelting), and then liquid-to-ice (electrofreezing) phase transitions with the increase of the charge value. Corresponding to the ice-liquid-ice transition, the variations of the order parameters indicate an order-disorder-order transition. The key to this novel phenomenon is the surface charge induced change of the orientations of water dipoles, which leads to the change of the water-water interactions from being attractive to repulsive at a critical charge value q(c). To further uncover how the orientations of water dipoles influence the interaction strength between water molecules, a theoretical model considering both the Coulomb and van der Waals interactions is established. The results show that with the increase of the charge value, the interaction strength between water molecules decreases below q(c), then increases above q(c). These two inverse processes lead to electromelting and electrofreezing, respectively. Combining this model with the Eyring equation, the diffusion coefficient is obtained, the variation of which is in qualitative agreement with the simulation results. Our findings not only expand our knowledge of the graphene-water interface, but related analyses could also help recognize the controversial role of the surface charge or electric field in promoting phase transitions of water.
Subject AreaChemistry ; Science & Technology - Other Topics ; Materials Science ; Physics
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Indexed BySCI ; EI
Language英语
WOS IDWOS:000335148800056
Funding OrganizationThis work was jointly supported by the National Natural Science Foundation of China (NSFC, grant no. 11372313 and 11202213), the Key Research Program of the Chinese Academy of Sciences (grant no. KJZD-EW-M01), and the Instrument Developing Project of the Chinese Academy of Sciences (grant no. Y2010031).
DepartmentLNM纳/微系统力学与物理力学
Classification一类
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Cited Times:22[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/48832
Collection非线性力学国家重点实验室
Corresponding AuthorZhao, YP (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China.
Recommended Citation
GB/T 7714
Zhu XY,Yuan QZ,Zhao YP,et al. Phase transitions of a water overlayer on charged graphene: from electromelting to electrofreezing[J]. NANOSCALE,2014,6(10):5432-5437.
APA Zhu XY,Yuan QZ,Zhao YP,&Zhao, YP .(2014).Phase transitions of a water overlayer on charged graphene: from electromelting to electrofreezing.NANOSCALE,6(10),5432-5437.
MLA Zhu XY,et al."Phase transitions of a water overlayer on charged graphene: from electromelting to electrofreezing".NANOSCALE 6.10(2014):5432-5437.
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