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Digitale Medien

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. ; [weitere]

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

Schlagwort(e): ORMOSIL ; hybrid ; sol-gel ; 1H NMR ; Chemistry ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik

Notizen: 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.

Zusätzliches Material: 4 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/amo.860040408

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Digitale Medien

Reversed potentials in isolated frog skin. II. Active transport of chloride (1966)

Martin, Duncan W. ; Curran, Peter F.

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

Journal of Cellular Physiology 67 (1966), S. 367-373

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ISSN: 0021-9541

Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Biologie , Medizin

Notizen: Net inward transport of Cl in the absence of an electrochemical potential difference was demonstrated in the skin of two species of frog, R. pipiens and R. esculenta under conditions of low (2 mM) Cl concentration in the bathing solutions. The electrical potential profile of skins of R. pipiens was examined with microelectrodes under conditions in which the inside solution was negative relative to the outside solution. This reversal of the normal potential difference was found to arise as a result of potential changes across the outward facing electrical barriers in the skin. The reversed potential difference appears to arise, at least in part, as a result of the inward Cl transport. The effect may be due either to electrogenic Cl transfer or to variations in internal composition of the epithelial cells arising as a result of Cl transport.

Zusätzliches Material: 1 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jcp.1040670302

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Digitale Medien

Reversed potentials of isolated frog skin (1964)

Martin, Duncan W.

Philadelphia : Wiley-Blackwell

Journal of Cellular and Comparative Physiology 63 (1964), S. 245-251

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ISSN: 0095-9898

Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Biologie , Medizin

Zusätzliches Material: 5 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jcp.1030630215

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