Phase transitions of a water overlayer on charged graphene: from electromelting to electrofreezing

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	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.
发表期刊	NANOSCALE
	2014
卷号	6 期号:10 页码:5432-5437
ISSN	2040-3364
摘要	We 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.
学科领域	Chemistry ; Science & Technology - Other Topics ; Materials Science ; Physics
URL	查看原文
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000335148800056
项目资助者	This 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).
课题组名称	LNM纳/微系统力学与物理力学
论文分区	一类
引用统计	被引频次：34[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/48832
专题	非线性力学国家重点实验室
通讯作者	Zhao, YP (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China.
推荐引用方式 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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