한국해양대학교

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분자동역학법을 이용한 Nano-Scale계의 평형상태에 관한 연구

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dc.contributor.author 최현규 -
dc.date.accessioned 2017-02-22T06:16:00Z -
dc.date.available 2017-02-22T06:16:00Z -
dc.date.issued 2005 -
dc.date.submitted 56823-07-22 -
dc.identifier.uri http://kmou.dcollection.net/jsp/common/DcLoOrgPer.jsp?sItemId=000002175088 ko_KR
dc.identifier.uri http://repository.kmou.ac.kr/handle/2014.oak/9244 -
dc.description.abstract Recently, we noticed the studies on the temperature boundary layer at a liquid-vapor interface, which reported that there exists the temperature difference over a liquid-vapor interface even though the system is at equilibrium state when the size of a system reduces to a micro-scale. The conclusion of those studies leaves a highly attractive question on whether the definition of equilibrium state should be changed in the case that the size of a system reduces to a nano-scale dimension. From the viewpoint of classical thermo -dynamics, if a system is at equilibrium state, the properties of interest should be measured as the same value within an instrument error. As example, the temperatures of a liquid and a vapor region are actually measured to be identical if they are in a saturated state. Although there are many molecular dynamics (MD) studies to survey the features of a liquid-vapor interface, a solid-liquid interface, or a solid-solid interface, there is no reported study that ascertains the temperature difference over a liquid-vapor interface at equilibrium state. In regard with the temperature discontinuity over an interface, which is the main focus of the present study, Maruyama et al. firstly observed the temperature jump at the solid-liquid interface that is called Kapitza resistance through the MD simulation when evaporation and condensation occur. In their study, they estimated the quantitative temperature jump at solid-liquid interface and calculated the equivalent liquid heat conduction thickness corresponding to an interface thermal resistance. Therefore, it is needed to confirm the temperature discontinuity over a liquid-vapor interface in an equilibrium two phase state. At present study, I clarified through the molecular dynamics method that the conclusions of the previous studies might be resulted from the misleading method to calculate the temperature profile. Molecular dynamics simulations compute the motions of individual molecules in models of solids, liquids, and gases. The key idea is motion which describes how positions, velocities, and orientations change with time. From this study, I suggest that there is no temperature discontinuity over a liquid-vapor interface independent of a system size if the system is in equilibrium state. Even though this research is contrary to other recent MD studies, the definition of an equilibrium state from classical thermodynamics can be still applicable to a nano-scale system if the approach is adopted. -
dc.description.tableofcontents Abstract ⅲ 그림 목차 ⅴ 표 목차 ⅷ 사용기호 ⅸ 제1장 서 론 1 1.1 연구의 배경 1 1.2 종래의 관련 연구 5 1.3 연구의 목적 9 제2장 계산방법 12 2.1 분자동역학법 12 2.2 온도의 정의 27 2.3 온도제어법 33 2.4 압력의 정의 36 2.5 계산계의 구성 49 2.6 네이버리스트 57 제3장 계산결과 61 3.1 네이버리스트의 영향 61 3.2 기액계면 분자의 운동특성 72 3.3 온도경계층 86 3.4 밀도경계층 103 제4장 결론 108 참고문헌 109 부록 119 -
dc.language kor -
dc.publisher 한국해양대학교 대학원 -
dc.title 분자동역학법을 이용한 Nano-Scale계의 평형상태에 관한 연구 -
dc.title.alternative A Study on the Equilibrium State of Nano-Scale System with Molecular Dynamics -
dc.type Thesis -
dc.date.awarded 2005-08 -
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