Carbon-13 NMR Study of Liquid Crystals

液晶的碳 13 NMR 研究

• 批准号: 9321114
• 负责人: Bing Fung
• 金额: $ 15.48万
• 依托单位: University of Oklahoma Norman Campus
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-05-01 至 1997-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9321114&HistoricalAwards=false
• 关键词: Carbon; 13; NMR; Study; Liquid

9321114 Fung The most important characteristic of liquid crystals is the presence of orientational ordering without long-range positional ordering. The combination of variable-angle spinning (VAS) and separated local field spectroscopy (SLF) will be used to study the orientational ordering of liquid crystals by C-13 NMR, and to investigate many systems important in basic research and industry. The C-13 NMR will be used to investigate the dynamic process of the reorientation of liquid crystals in a magnetic field. Improvement of the VAS/SLF technique will be considered, and a new method with rapid deceleration in VAS will be used. Further, the possibility of applying 3D NMR to liquid crystal systems will be explored. In addition, molecular dynamics calculations of nematic ordering with a new pseudo-molecule" approach is proposed. ***

[321114]冯：液晶最重要的特性是有取向有序而没有长程位置有序。可变角度旋转（VAS）和分离局部场光谱（SLF）的结合将用于C-13核磁共振研究液晶的定向有序，并研究许多在基础研究和工业中具有重要意义的体系。利用核磁共振C-13研究了液晶在磁场作用下定向的动态过程。将考虑对VAS/SLF技术的改进，并采用一种具有VAS快速减速的新方法。此外，将探讨将三维核磁共振应用于液晶系统的可能性。此外，提出了一种新的“伪分子”方法来计算向列有序的分子动力学。＊＊＊