| 报告题目 | Order and Disorder in Adsorbed Molecular Arrays |
| 报告人 | Prof. Peter Beton |
| 报告人单位 | School of Physics & Astronomy, University of Nottingham, UK |
| 报告时间 | 2012-11-29 |
| 报告地点 | 合肥微尺度物质科学国家实验室9004会议室 |
| 主办单位 | 合肥微尺度物质科学国家实验室 |
| 报告介绍 | Abstract:
The role of disorder in the formation of two-dimensional networks is currently attracting great interest and provides interesting connections between surface science and statistical mechanics. The properties of an entropy-stabilised supramolecular network will be reviewed. These networks map directly onto a rhombus tiling of the plane and support a random tiling phase which has been studied widely by theorists over several decades. The networks are analyzed by treating them as projections of the (111) surface of a simple cubic crystal and are characterized using the height correlations of this virtual surface. It is also shown that topological defects are supported within this array and that broken symmetries lead to phase transitions between ordered and disordered phases. Growth of the networks, which are dynamically-arrested systems, will also be considered. The role of disorder in the formation of covalently bound molecular networks will also be presented including those formed on the surface, and also flexible porphyrin polymers and nanorings deposited using electrospray. For polymeric systems it is possible to define a 2D correlation length and we also discuss distortion, packing and stacking of flexible cyclic polymers. |
