物理化学学报 >> 1998, Vol. 14 >> Issue (10): 869-873.doi: 10.3866/PKU.WHXB19981002

通讯 上一篇    下一篇

某些有机物在氧化物载体表面的自发单层分散

王小勇, 王敏, 赵璧英, 谢有畅   

  1. 北京大学物理化学研究所,北京 100871
  • 收稿日期:1998-06-09 修回日期:1998-07-28 发布日期:1998-10-15
  • 通讯作者: 赵璧英

Spontaneous Monolayer Dispersion of Some Organic Compounds on Oxide-supports

Wang Xiao-Yong, Wang Min, Zhao Bi-Ying, Xie You-Chang   

  1. Institute of Physical Chemistry,Peking University,Beijing 100871
  • Received:1998-06-09 Revised:1998-07-28 Published:1998-10-15
  • Contact: Zhao Bi-Ying

关键词: 自发单层分散, 临界分散温度, 单层分散阈值, 有机物单层分散

Abstract:

XRD and FT-IR methods were applied to the studies of organic monolayer dispersion systems. Naphthalene, borneol, benzoic acid, salicylic acid, phthalic acid and tartaric acid were mixed with γ-Al2O3 and SiO2 separately. The results showed that the organic compounds can also disperse spontaneously onto the surfaces of different oxide-supports to become high dispersion states like the behavior of inorganic salts and oxides. The organic substances studied are more ready to disperse with 1ess carboxyl or hydroxyl groups on their aromatic nucleus, suggesting the migration on the surface of the support is rate-determining during the dispersion. This point of view is supported by the result of IR spectroscopy. The IR spectra of dispersed systems suggest that the carboxy1 may react with the surface hydroxyl groups of the support to form salt-like structures on the surface.

Key words: Spontaneous monolayer dispersion, The critical dispersion temperature, Dispersion threshold, Monolayer dispersion of organic compounds