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Optical and microstructural properties of a simple ORMOSIL (1994)

Seddon, A. B. ; Capozzi, C. A. ; Lana, S. L. ; [et al.]

Springer

Journal of sol gel science and technology 2 (1994), S. 181-183

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ISSN: 1573-4846

Keywords: ORMOSIL ; microstructure ; rhodamine 6G ; fluorescence

Source: Springer Online Journal Archives 1860-2000

Topics: Chemistry and Pharmacology

Notes: Abstract The optical and microstructural properties of a methyl-modified silicate have been investigated in the absence and presence of a guest fluorescent dopant. The ORMOSIL host exhibits low intrinsic optical loss, down to 0.6 dB cm−1 at 0.633 µm. The dopant was found to be uniformly dispersed throughout the matrix. Evaluation of the host microstructure indicates that it is amorphous and that there is no evidence for macroscopic phase-separation, but that at ultra-high resolution there exists some local elongated structure which may be due to residual microporosity.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00486237

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Cleavage of silicon-carbon bonds and relative rates of hydrolysis of ormosil precursors for optical materials (1994)

Seddon, Angela B. ; Hunt, Suzane ; Rourke, Jonathan P. ; [et al.]

New York, NY [u.a.] : Wiley-Blackwell

Advanced Materials for Optics and Electronics 4 (1994), S. 285-291

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ISSN: 1057-9257

Keywords: ORMOSIL ; hybrid ; sol-gel ; 1H NMR ; Chemistry ; Polymer and Materials Science

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Electrical Engineering, Measurement and Control Technology , Physics

Notes: 1H NMR spectroscopy of methyltrimethoxysilane (MTMS) has revealed that cleavage of the Si - C bond occur during hydrolysis in the presence of HCI. A mechanism is suggested involving nuleophillic attack by CI- with electrophilic promotion. Optical materials based on tetramethoxysilane (TMOS) and MTMS are vsually transparent and 1H NMR reveals the similarity of the hydrolysis rates of these precursors under acid catalysis. 1H NMR indicates that residual unhydrolysed methoxide groups in the finished optical materials are a possibility.

Additional Material: 4 Ill.