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Effects of Surface Dipole Lengths on Evaporation of Tiny Water Aggregation
Wang Shen(王棽); Tu Yu-Song; Wan Rong-Zheng(万荣正); Fang Hai-Ping(方海平)
2013
Source PublicationCOMMUNICATIONS IN THEORETICAL PHYSICS
ISSN0253-6102
Volume59Issue:5Pages:CONCATENATE(Sheet1!I105,-Sheet1!J105)
AbstractUsing molecular dynamics simulation, we compared evaporation behavior of a tiny amount of water molecules adsorbed on solid surfaces with different dipole lengths, including surface dipole lengths of 1 fold, 2 folds, 4 folds, 6 folds and 8 folds of 0.14 nm and different charges from 0.1e to 0.9e. Surfaces with short dipole lengths (1-fold system) can always maintain hydrophobic character and the evaporation speeds are not influenced, whether the surface charges are enhanced or weakened; but when surface dipole lengths get to 8 folds, surfaces become more hydrophilic as the surface charge increases, and the evaporation speeds increase gradually and monotonically. By tuning dipole lengths from 1-fold to 8-fold systems, we confirmed non-monotonic variation of the evaporation flux (first increases, then decreases) in 4 fold system with charges (0.1e-0.7e), reported in our previous paper [S. Wang, et al., J. Phys. Chem. B 116 (2012) 13863], and also show the process from the enhancement of this unexpected non-monotonic variation to its vanishment with surface dipole lengths increasing. Herein, we demonstrated two key factors to influence the evaporation flux of a tiny amount of water molecules adsorbed on solid surfaces: the exposed surficial area of water aggregation from where the water molecules can evaporate directly and the attraction potential from the substrate hindering the evaporation. In addition, more interestingly, we showed extra steric effect of surface dipoles on further increase of evaporation flux for 2-folds, 4-folds, 6-folds and 8-folds systems with charges around larger than 0.7e. (The steric effect is first reported by parts of our authors [C. Wang, et al., Sci. Rep. 2 (2012) 358]). This study presents a complete physical picture of the influence of surface dipole lengths on the evaporation behavior of the adsorbed tiny amount of water.
Indexed BySCI
Language英语
Funding Project应物所项目组
WOS IDWOS:000319109200017
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.sinap.ac.cn/handle/331007/13733
Collection中科院上海应用物理研究所2011-2019年
Recommended Citation
GB/T 7714
Wang Shen,Tu Yu-Song,Wan Rong-Zheng,et al. Effects of Surface Dipole Lengths on Evaporation of Tiny Water Aggregation[J]. COMMUNICATIONS IN THEORETICAL PHYSICS,2013,59(5):CONCATENATE(Sheet1!I105,-Sheet1!J105).
APA Wang Shen,Tu Yu-Song,Wan Rong-Zheng,&Fang Hai-Ping.(2013).Effects of Surface Dipole Lengths on Evaporation of Tiny Water Aggregation.COMMUNICATIONS IN THEORETICAL PHYSICS,59(5),CONCATENATE(Sheet1!I105,-Sheet1!J105).
MLA Wang Shen,et al."Effects of Surface Dipole Lengths on Evaporation of Tiny Water Aggregation".COMMUNICATIONS IN THEORETICAL PHYSICS 59.5(2013):CONCATENATE(Sheet1!I105,-Sheet1!J105).
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