Study on the structure and properties of liquids under various environments using molecular dynamics simulations = 다양한 환경하에서의 액체 구조와 성질에 관한 분자동력학적 모의실험

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I have studied the structure and properties of liquid state using molecular dynamics simulations method. The major points I have dealt with are structural changes of water induced by an external electric field and the curvature dependence of the surface tension of argon liquid. At first, using molecular dynamics simulations with the rigid TIP4P water model, I have analyzed the structural change of liquid water induced by an external electric field. The temperature was controlled with a Nose-Hoover thermostat. From this simulation study, I found liquid water with the enhanced structural regularity by applying an electric field could be acquired. Through the simulations under various strengths of the electric field, I can see that the threshold for the significant structural change is thought to be between 0.2 and 0.15 V/Å. When the number of six-membered rings is increased by the external electric field, so that water is forced to have structural regularity, I calculate the diffusion coefficients and discover that water I make in the simulations is not solid but still liquid under the electric field. Secondly, I present the first molecular dynamics simulation study of vapor bubbles. Molecular dynamics simulations are carried out to examine the curvature dependence of the surface tension for argon vapor bubble as well as liquid droplet. Using the Irving-Kirkwood pressure tensor, I calculate the surface tension and the surface of tension by two thermodynamic methods. The results for the surface tension of droplet show that the surface tension decreases with decreasing droplet radius. On the other hand, the surface tension of vapor bubble increases with decreasing bubble radius.
Advisors
Jung, Kyung-Hoon정경훈
Description
한국과학기술원 : 화학과,
Publisher
한국과학기술원
Issue Date
2001
Identifier
169576/325007 / 000965354
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 화학과, 2001.8, [ vii, 69 p. ]

Keywords

Surface Tension; Electric Field; Liquids; Molecualr Dynamics; Curvature; 곡률; 표면장력; 전기장; 액체; 분자동력학적 모의실험

URI
http://hdl.handle.net/10203/31568
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=169576&flag=dissertation
Appears in Collection
CH-Theses_Ph.D.(박사논문)
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