Scaling properties in the molecular structure of three-dimensional, nanosized phenylene-based dendrimers as studied by atomistic molecular dynamics simulations

被引:26
作者
Pricl, S [1 ]
Fermeglia, M [1 ]
Ferrone, M [1 ]
Asquini, A [1 ]
机构
[1] Univ Trieste, DICAMP, Dept Chem Engn, Comp Aided Syst Lab, I-34127 Trieste, Italy
关键词
non-graphitic carbon; molecular simulation; biocompatibility; chemical structure; surface areas;
D O I
10.1016/S0008-6223(03)00254-9
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Three-dimensional polyphenylene dendrimers (PDs) can be prepared in ways that enable control of their shape. Their structures may be used as scaffolds with a wide variety of functionality, enabling them to be used as functional nanoparticles with a large range of possible applications, ranging from light emitting devices to biological sensors or drug delivery tools. As PDs have been synthesized only recently, their structural and chemico-physical characterization is still in its infancy. Accordingly, in this paper the shape and internal organization of three PD families based on three different cores were probed by accurate, atomistic molecular dynamics simulations (MD). Particular care was taken to ensure complete structural equilibration by implementing an MD simulated annealing protocol prior to evaluation of the molecular structure and dynamics. All dendrimer families were found to be characterized by molecular dimensions in the nano-range, and by a shape-persistent, non-spherical structure, of molecular fractal dimension around 2.5-2.6, and of surface fractal dimension practically constant and almost equal to 2 with increasing generations in all cases. The MD analysis revealed also that, for this type of dendrimers, the starburst limited generation is presumably located in correspondence of the third generation. (C) 2003 Elsevier Ltd. All rights reserved.
引用
收藏
页码:2269 / 2283
页数:15
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