Thermodynamics of Interfaces Extended to Nanoscales by Introducing Integral and Differential Surface Tensions

发布日期:2021-01-06 作者:瞿磊 编辑:瞿磊 来源:兰州理论物理中心

主讲人:董玮教授(法国里昂高师)

题目:Thermodynamics of Interfaces Extended to Nanoscales by Introducing Integral and Differential Surface Tensions

时间:2021年01月09日上午09:00

会议ID:(腾讯会议)823 675 414

直播链接:https://www.koushare.com/lives/room/603907

线下地点:兰州大学理工楼1201报告厅

联系人:黄亮

报告摘要

As a system shrinks down in size, more and more molecules are found in its surface region, so surface contribution becomes a large or even a dominant part of its thermodynamic potentials. Surface tension is a venerable scientific concept, Gibbs defined it as the excess of grand potential of an inhomogeneous system with respect to its bulk value per interface area. The mechanical definition expresses it in terms of pressure tensor. So far, it has been believed the two definitions give always the same result. We show that the equivalence can break down for fluids confined in narrow pores. New concepts of integral and differential surface tensions, along with integral and differential adsorptions, need to be introduced for extending Gibbs thermodynamics of interfaces. We derived two generalized Gibbs adsorption equations. These new concepts are indispensable for an adequate description of nanoscale systems. We find also a relation between integral surface tension and Derjaguin's disjoining pressure. This lays down the basis for measuring integral and differential surface tensions from disjoining pressure by using AFM (Atomic Force Microscope).

个人简介

董玮,法国国家科研中心主任研究员 (CNRS Research Director),法国里昂高师教授。现任职单位 : 法国里昂高师化学研究室 (Laboratoire de Chimie, Ecole Normale Supérieure de Lyon)。湖南大学学士(化学,1982);同年考取教育部公费出国研究生(浙江大学代培,1982-1983);1983年赴法留学;法国巴黎六大博士(物理,1987);德国柏林自由大学博士后(1988);自1989年起任法国国家科研中心终身研究员。主要研究方向 : 液体物理 (受限液体);表面化学动力学;非均相催化。获法国化学会催化科学奖 (Prix de la Catalyse, Société Française de Chimie, 2001)。

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