Zobrazeno 1 - 10
of 27
pro vyhledávání: '"J. Ben H. Jansen"'
Publikováno v:
Clays and Clay Minerals. 45:1-7
The effects of reaction time (2 to 72 h) and NH (super +) 4 /Al (super 3+) molar ratio (1.6, 2.4 and 3.2) on the hydrothermal synthesis of ammonium-saponites are investigated. The gels are obtained by mixing powders, resulting in a stoichiometric com
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::75161e276307a7b765486779e5b312fa
https://doi.org/10.1346/ccmn.1997.0450101
https://doi.org/10.1346/ccmn.1997.0450101
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
Autor:
Ronald J. Bakker, J. Ben H. Jansen
Publikováno v:
Contributions to Mineralogy and Petrology. 116:7-20
Preferential leakage of H2O from fluid inclusions containing multiple gas components has been suspected in natural metamorphic rocks and has been demonstrated experimentally for synthetic H2O-CO2-rich inclusions in natural quartz. Knowledge of the ph
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::14c17d6dc51f819a56767da9db6ac766
https://doi.org/10.1007/bf00310686
https://doi.org/10.1007/bf00310686
Publikováno v:
Clays and Clay Minerals. 42:18-22
Saponites were hydrothermally grown in the presence of amounts of NH4+, Na+, K+, Rb+, Ca2+, Ba2+, and Ce4+ equivalent with the CEC of the saponite (155 meq/100 g), with or without F−, at a temperature of 200°C for 72 hr. XRD and CEC data revealed
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9002239f98ba20dde97e74fbdc4dc6f7
https://doi.org/10.1346/ccmn.1994.0420103
https://doi.org/10.1346/ccmn.1994.0420103
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:
Lithos. 30:167-189
The halogen chemistry of apatites, biotites, amphiboles and titanites from metabasites in the Proterozoic Bamble Sector amphibolite-granulite facies transition zone (Norway) has been studied to gather data on the behaviour of halogens during original
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3c6b6003c4e3323fbaaeed8e48d3a64e
https://doi.org/10.1016/0024-4937(93)90014-4
https://doi.org/10.1016/0024-4937(93)90014-4
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
Autor:
John W. Geus, J. Ben H. Jansen, A.M.J. van der Eerden, J. Theo Kloprogge, Roelof D. Schuiling
Publikováno v:
Clays and Clay Minerals. 41:423-430
In the chemical system Na2O-Al2O3-SiO2-H2O, the stability field of Na-beidellite is presented as a function of pressure, temperature, and Na- and Si-activity. Na0.7-beidellite was hydrothermally synthesized using a stoichiometric gel composition in t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5436e91e51945b7cb59eaba39c0f6868
https://doi.org/10.1346/ccmn.1993.0410403
https://doi.org/10.1346/ccmn.1993.0410403
Publikováno v:
Clays and Clay Minerals. 41:103-110
Ammonium-saponite is hydrothermally grown at temperatures below 300°C from a gel with an overall composition corresponding to (NH4)0.6Mg3Si34Al0.6O10(OH)2. The synthetic saponite and coexisting fluid have been characterized by means of X-ray powder
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::64b52c50924e53c391639d39e91cbd63
https://doi.org/10.1346/ccmn.1993.0410111
https://doi.org/10.1346/ccmn.1993.0410111
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