Correlated Membrane Fluctuations in Nanocrystal Superlattices

作     者：Brian A. Korgel 

作者机构：Department of Chemical Engineering and Texas Materials Institute and Center for Nano- and Molecular Science and Technology The University of Texas Austin Texas 78712-1062 

出 版 物：《Physical Review Letters》 (Phys Rev Lett)

年 卷 期：2001年第86卷第1期

页      面：127-127页

核心收录：

学科分类：07[理学] 0702[理学-物理学] 

主　　题：Superlattices 

摘      要：Superlattices of organic monolayer-stabilized silver nanocrystals exhibit structural integrity at temperatures well above the melting point of the hydrocarbon capping ligands (i.e., the C8, C12, and C16 alkanethiols used in this study). Temperature-dependent small angle x-ray scattering reveals that topological disordering occurs with spatially correlated domains of characteristic length ξ that grow with increasing temperature until ξ diverges at a critical temperature Tc, as ξ∼ξ0(1−T/Tc)−0.67. A power law analysis of the scattering intensity with wave vector indicates that interactions between membranes due to thermal undulations control the topology below Tc.