Solvent-Induced Textural Changes of As-Synthesized Mesoporous Alumina, As Reported by Spin Probe Electron Spin Resonance Spectroscopy
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- 作者：Agneta Caragheorgheopol ; Horia Caldararu ; Gabriela Ionita ; Florenta Savonea ; Nad
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- 刊名：Langmuir
- 出版年：2005
- 出版时间：March 15, 2005
- 年：2005
- 卷：21
- 期：6
- 页码：2591 - 2597
- 全文大小：136K
- 年卷期：v.21,no.6(March 15, 2005)
- ISSN：1520-5827
文摘
The effect of solvent used during the synthesis and postsynthesis treatment on textural properties oforganized mesoporous aluminas was investigated and related to the behavior of spin probes studied byelectron spin resonance (ESR) spectroscopy. It was found that the structure of surfactant aggregatesserving in the as-synthesized precipitates as templates could be easily modified by treatment with differentsolvents. This treatment induces corresponding variations in surface areas, mesopore volumes, and mesoporediameters of the final products. The ESR spectrum of 5-doxyl stearic acid spin probe properly reflects thechanges in template structure based on changes of the solvent used and represents an early indicator ofthe corresponding textural modifications of the mesoporous alumina.