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Citation: Wang Xiao-Yong, Wang Min, Zhao Bi-Ying, Xie You-Chang. Spontaneous Monolayer Dispersion of Some Organic Compounds on Oxide-supports[J]. Acta Physico-Chimica Sinica, ;1998, 14(10): 869-873. doi: 10.3866/PKU.WHXB19981002 shu

Spontaneous Monolayer Dispersion of Some Organic Compounds on Oxide-supports

1.
Institute of Physical Chemistry,Peking University,Beijing 100871

Received Date: 9 June 1998
Available Online: 15 October 1998

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.
- Spontaneous monolayer dispersion,
- The critical dispersion temperature,
- Dispersion threshold,
- Monolayer dispersion of organic compounds
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