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分子动力学模拟亲水性纳米窄缝中的聚乙烯分子

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摘要 采用分子动力学模拟了两亲水性壁面间的聚乙烯分子水溶液.壁面间距(1.26~3.15nm)与聚乙烯分子的特征尺寸相当,随间距减小可以观察到聚乙烯分子构象从三维结构向二维结构的转变.同非受限状态相比,强受限情况下,化学键取向呈规则变化,亚甲基分层排布且沿垂直于壁面方向上的扩散运动显著降低.从热力学角度看,水分子运动空间增大对聚乙烯分子的构象熵减小做出补偿,以使体系自由能降低.
出处 《科学通报》 EI CAS CSCD 北大核心 2008年第8期893-899,共7页 Chinese Science Bulletin
基金 国家自然科学基金(批准号:20336040,20490201,20221603) 中国科学院知识创新工程重要方向性项目(批准号:KJCX-SW-L01,KJCX3-SYW-S01) 教育部重点实验室基金(批准号:2006-1)资助
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