Zobrazeno 1 - 10
of 16
pro vyhledávání: '"Don Seykens"'
Autor:
Don Seykens, J. Ben H. Jansen, Roland J. M. J. Vogels, Paul A. Buining, John W. Geus, J. Theo Kloprogge
Publikováno v:
Journal of Non-Crystalline Solids. 191:38-44
The aging of the aluminum tridecamer in acidified aluminum sec-butoxide is studied with 27Al nuclear magnetic resonance. At 20°C the tridecamer content passes through a maximum of 19.7% after 133 h of aging to decline subsequently to a final content
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7ce695f5b2769220e584da21bf7c3598
https://doi.org/10.1016/0022-3093(95)00304-5
https://doi.org/10.1016/0022-3093(95)00304-5
Publikováno v:
Phytochemistry. 37:1605-1610
Asclepias curassavica plants were grown on soil in a controlled environment, but no cardenolides were detected in aerial parts until the appearance
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6aa5b50687a68c595f4ad8543bc142a3
https://doi.org/10.1016/s0031-9422(00)89575-8
https://doi.org/10.1016/s0031-9422(00)89575-8
Publikováno v:
Journal of Non-Crystalline Solids. 160:144-151
The Al concentration and forced hydrolysis influence the polymerization of aqueous Al(III) and thus the 27Al NMR spectra. An increase of the Al concentration results in an increase of the fraction present as monomer, in the formation of an oligomer o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d9311e96ac4e4e51f1ebe1f810c0df00
https://doi.org/10.1016/0022-3093(93)90294-8
https://doi.org/10.1016/0022-3093(93)90294-8
Publikováno v:
Journal of Non-Crystalline Solids. 152:207-211
The 27 Al monomer resonance of 0.05M aluminum nitrate solutions gradually broadens from 7.82 to 89.40 Hz upon forced hydrolysis from an OH/Al molar ratio of 0.0 to 2.2. The broadening is due to increasing amounts of [AlOH] 2+ and [Al(OH) 2 ] + up to
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5dbd809c743b3dc230f7ac04e1f55210
https://doi.org/10.1016/0022-3093(93)90253-t
https://doi.org/10.1016/0022-3093(93)90253-t
Publikováno v:
Thermochimica Acta. 209:265-276
The tridecameric aluminum polymer [AlO4Al12(OH)24(H2O)12]7+ is prepared by forced hydrolysis of an Al(NO3)3 solution by NaOH up to an OH:Al mol ratio of 2.2. Upon addition of sulfate the tridecamer crystallizes into macroscopic crystallites of the ba
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::093d06028105c791973b334a23644e35
https://doi.org/10.1016/0040-6031(92)80204-a
https://doi.org/10.1016/0040-6031(92)80204-a
Publikováno v:
Journal of Non-Crystalline Solids. 142:87-93
Stepwise heating to 85°C in the NMR apparatus does not notably change the monomer and tridecamer (Al13) concentrations in a 0.2M Al(NO3)3 solution neutralized with 0.2M NaOH up to an OH/Al molar ratio of 2.4. Upon heating the fourfold coordinated 27
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e14ab7d38cb64c238cddc1cfc9e84c99
https://doi.org/10.1016/s0022-3093(05)80010-9
https://doi.org/10.1016/s0022-3093(05)80010-9
A 27Al nuclear magnetic resonance study on the optimalization of the development of the Al13 polymer
Publikováno v:
Journal of Non-Crystalline Solids. 142:94-102
Synthesis conditions strongly influence the yield of the tridecameric polymer Al13 ([AlO 4 Al 12 (OH) 24 (H 2 O) 12 ] 7+ ). An amount of 68% tridecamer was achieved by injection of alkali through a capillary tube into a 5 × 10 −2 M Al solution at
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::07dd5ab46be4d1093c6ba0c2202b5396
https://doi.org/10.1016/s0022-3093(05)80011-0
https://doi.org/10.1016/s0022-3093(05)80011-0
Publikováno v:
Journal of Non-Crystalline Solids. 146:111-120
Simplified kinetics are used to describe the rates of hydrolysis and condensation in a Si(OCH3)4/CD3OD/H2O/HCl sol-gel system with H2O/Si = 8. The kinetics of the system can be expressed by three principal reactions: hydrolysis, esterification and wa
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::fe94856c2216f69dd2b524c550211287
https://doi.org/10.1016/s0022-3093(05)80482-x
https://doi.org/10.1016/s0022-3093(05)80482-x
Publikováno v:
Journal of Biological Chemistry. 266:21399-21403
The dependence of the flux in the alcohol-degrading pathway on the activity of alcohol dehydrogenase was investigated in Drosophila larvae. Third-instar larvae were supplied with [2-13C]ethanol as a dietary carbon source. Specific carbon enrichments
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2da3c2a5796fd43e8b1e3deed9bde29c
https://doi.org/10.1016/s0021-9258(18)54651-2
https://doi.org/10.1016/s0021-9258(18)54651-2
Publikováno v:
Journal of Non-Crystalline Solids. 134:14-22
29Si NMR spectroscopy is an adequate technique to record SiO2 polymerization in sol-gel systems. The influence of variation of the initial molar H2O/TMOS ratio, Rw, has been studied at a fixed reaction time in the early stages of the polymerization,
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6be44f39ead6c391a81654f941e2c8cf
https://doi.org/10.1016/0022-3093(91)90006-r
https://doi.org/10.1016/0022-3093(91)90006-r