Zobrazeno 1 - 10 of 26 pro vyhledávání: '"Jan W, de Haan"'
1
13C and 23Na Solid-state NMR study on zeolite Y loaded with Mo(CO)6
Autor: Jan W. de Haan, Rutger A. van Santen, Hubert Koller, AR Arian Overweg
Publikováno v: Journal of Physical Chemistry B, 101(10), 1754-1761. American Chemical Society
The Na-23 MAS and double rotation (DOR) NMR spectra of dehydrated zeolite NaY loaded with two molecules of Mo(CO)(6) per supercage show three components distinguished by the corresponding quadrupole coupling constants (QCC). Sodium cations in the hex
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8f6300a17bb90036959635b79dfcead9
https://doi.org/10.1021/jp962791q
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2
Chromatographic activity of residual silanols of alkylsilane derivatized silica surfaces
Autor: Henk A. Claessens, Carel A. Cramers, Jan W. de Haan, A.B. Scholten
Publikováno v: Journal of Chromatography, A, 759(1-2), 37-46. Elsevier
Residual silanols on n-octadecylsilane derivatized silica surfaces have a pronounced effect on the chromatographic performance of reversed-phase high-performance liquid chromatography (RP-HPLC) materials. The present study describes how the results o
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::577ca25a418f31f5c56cb23bfc4fa969
https://doi.org/10.1016/s0021-9673(96)00765-0
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3
29-Silicon NMR evidence for the improved chromatographic siloxane bond stability of bulky alkylsilane ligands on a silica surface
Autor: Alex B. Scholten, Jan W. de Haan, Carel A. Cramers, Henk A. Claessens, Leo J. M. van de Ven
Publikováno v: Journal of Chromatography A. 688:25-29
A stable bond stationary phase for reversed-phase high-performance liquid chromatography, with a diisobutyl-n-octadecylsilane derivatized surface, was studied using 29Si cross-polarization magic angle spinning (CP MAS) NMR. Fumed silica surfaces (Aer
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::3f61093a422b1fa0e408ac9d05d9e5e5
https://doi.org/10.1016/0021-9673(94)00928-7
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4
A study of the adsorption activities of silanol surface structures on a fused silica model substrate by combining29Si CP MAS NMR and inverse gas chromatographic data
Autor: Alex B. Scholten, Carel A. Cramers, Jan W. de Haan, Hans-Gerd Janssen
Publikováno v: Journal of High Resolution Chromatography, 17(2), 77-84. Wiley
Summary The possibilities of inverse gas-solid chromatography (IGC) in obtaining chromatographic data on fumed silica were examined. Aerosil A-200, a fused silica model substrate in 29Si nuclear magnetic resonance analysis, was trimethylsilylated to
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9196bfb75c1b85727115dd723c48647e
https://doi.org/10.1002/jhrc.1240170207
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6
The molecular basis of aging of aqueous silica gel
Autor: Kees P.J. Rummens, Jan W. de Haan, Rutger A. van Santen, Han C.P.L Saeijs, Theo P. M. Beelen, Leo J. M. van de Ven, Peter W.J.G. Wijnen
Publikováno v: Journal of Colloid and Interface Science. 145:17-32
The influence of aging on the local structure of aqueous silica gels has been investigated using small angle X-ray scattering (SAXS), solid state nuclear magnetic resonance (NMR), and nitrogen sorption techniques (BET). From SAXS experiments it is de
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::0518bb9e0f9401e2a1ac2499d8b5621a
https://doi.org/10.1016/0021-9797(91)90097-r
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7
13C MAS NMR study of solid poly(vinyl alcohol) and of ethylene-vinyl alcohol copolymers
Autor: Jan W. de Haan, A Annemieke Aerdts, Gpm van der Velden, Hhtm Ketels
Publikováno v: Polymer, 31(8), 1419-1424. Elsevier
High resolution 13 C n.m.r. spectra of solid ethylene-vinyl alcohol (EVOH) copolymers have been observed, exhibiting a splitting of the methine carbon resonance. This splitting could be explained taking into account a rather unique combination of bot
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d3b391535a41d64ac335706eb8385c99
https://research.tue.nl/en/publications/1b97db34-af82-46f2-b389-d60097a986a6
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8
Effect of Chain Length on the Adsorption Behavior ofn-Alkanes in Ferrierite
Autor: Xavier Cottin, Jan W. de Haan, Rutger A. van Santen, Willy J.M. van Well, Berend Smit
Publikováno v: Angewandte Chemie International Edition. 37:1081-1083
13C NMR spectroscopy and computer simulations have shown that the chain length of hydrocarbons has a surprising effect on where these molecules reside in the zeolite FER. Propane and butane can access the entire two-dimensional channel structure, whi
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::ffa78e6241276797c887a50a8eb51da8
https://doi.org/10.1002/(sici)1521-3773(19980504)37:8<1081::aid-anie1081>3.0.co
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10
A new assignment of the signals in 23Na DOR NMR to sodium sites in dehydrated Na Y zeolite
Autor: Vincent H. J. de Beer, Wim J. J. Welters, Leo J. M. van de Ven, Harry A. M. Verhulst, Gert Vorbeck, Jan W. de Haan, Rutger A. van Santen
Publikováno v: Journal of the Chemical Society, Chemical Communications, 639-640. Chemical Society
ISSUE=5;STARTPAGE=639;ENDPAGE=640;ISSN=0022-4936;TITLE=Journal of the Chemical Society, Chemical Communications
Spectral simulations of 23Na MAS and double rotation (DOR) NMR spectra of dehydrated NaY zeolite, CaNaY and Mo(CO)6 adsorbed in NaY allow the assignment of four signals to the five different Na+ sites. [on SciFinder (R)]
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::88f382c6c7c76414e5d2a4536248e5de
https://doi.org/10.1039/c39940000639
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