Silylation of a crystalline silicic acid: an MAS NMR and porosity study

2002 ◽  
Vol 12 (10) ◽  
pp. 3010-3015 ◽  
Author(s):  
Peter Heinrich Thiesen ◽  
Klaus Beneke ◽  
Gerhard Lagaly
Keyword(s):  
Silicic Acid ◽  
Mas Nmr ◽  
Crystalline Silicic Acid

scholarly journals Über die Natur der Siliciumdioxidmodifikation Silica-X / On the Nature of the Silica Modification "silica-X"

1979 ◽  
Vol 34 (4) ◽  
pp. 648-649 ◽  
Author(s):  
Klaus Beneke ◽  
Gerhard Lagaly
Keyword(s):  
Cation Exchange ◽  
Silicic Acid ◽  
Potassium Silicate ◽  
Silica Modification ◽  
Crystalline Silicic Acid

Abstract Silica-X described in 1964 as a new SiO2 modification is the dehydrated form of the crystalline silicic acid H2Si8O17 · xH2O which is obtained by cation exchange from the potassium silicate K2Si8O17 · xH2O.

Short range order at the amorphous TiO2–water interface probed by silicic acid adsorption and interfacial oligomerization: An ATR-IR and 29Si MAS-NMR study

2012 ◽  
Vol 368 (1) ◽  
pp. 447-455 ◽  
Author(s):  
Peter J. Swedlund ◽  
Yantao Song ◽  
Zoran D. Zujovic ◽  
Michél K. Nieuwoudt ◽  
Andreas Hermann ◽  
...  
Keyword(s):  
Silicic Acid ◽  
Short Range ◽  
Short Range Order ◽  
Mas Nmr ◽  
Range Order ◽  
Water Interface ◽  
29Si Mas Nmr ◽  
Nmr Study ◽  
Amorphous Tio2

ChemInform Abstract: 29Si MAS NMR Spectra of Lamellar Silicic Acid H-Magadiite and Its Trimethylsilyl Derivative.

ChemInform ◽  
1987 ◽  
Vol 18 (7) ◽  
Author(s):  
J. M. ROJO ◽  
J. SANZ ◽  
E. RUIZ-HITZKY ◽  
J. M. SERRATOSA
Keyword(s):  
Silicic Acid ◽  
Nmr Spectra ◽  
Mas Nmr ◽  
Trimethylsilyl Derivative ◽  
29Si Mas Nmr

Über eine neue kristalline Kieselsäure der Zusammensetzung H2Si14O29 · 5 H2O mit Schichtstruktur und Befähigung zur Bildung von Intercalationsverbindungen / A Crystalline Silicic Acid H2Si14O29 · 5 H2O with Layer Structure and Capability of Formation of Intercalation Compounds

1973 ◽  
Vol 28 (5-6) ◽  
pp. 234-238 ◽  
Author(s):  
Gerhard Lagaly ◽  
Klaus Beneke ◽  
Armin Weiss
Keyword(s):  
Sodium Silicate ◽  
Silicic Acid ◽  
Layer Structure ◽  
Intercalation Compounds ◽  
Two Dimensional ◽  
Topochemical Reaction ◽  
Crystalline Silicic Acid

A crystalline silicic acid H2Si14O29 · 5H2O has been prepared by topochemical reaction of sodium silicate Na2Si14O29·12H2O with acids. The compound has a layer structure with silicate sheets of about 11.2 Å thickness. The layer structure is clearly established by two dimensional reactions, mainly the formation of intercalation compounds with X-oxides (dimethylsulfoxide, pyridine-N-oxides etc.), acid amides, urea and its derivatives and bases such as hydrazine and pyridine. Typical exemples are 2 (CH3)2SO · H2Si14O29, 2C5H5NO · H2Si14O29, 2, 7 HCONHCH3 · H2Si14O29; 2, 3 HCON (CH3)2 · H2Si14O29; 1, 6 HCONHC2H5 · H2Si14O29; 1, 6 HCON (C2H5)2 · H2Si14O29.

Gas adsorption by a crystalline silicic acid

1989 ◽  
Vol 267 (9) ◽  
pp. 844-852 ◽  
Author(s):  
H. -H. Kruse ◽  
K. Beneke ◽  
G. Lagaly
Keyword(s):  
Silicic Acid ◽  
Gas Adsorption ◽  
Crystalline Silicic Acid

scholarly journals Preparation and constitution of the Crystalline Silicic Acid Trimethylsilyl Ester [(CH3)3Si]6Si6O15

1987 ◽  
Vol 552 (9) ◽  
pp. 236-240 ◽  
Author(s):  
D. Hoebbel ◽  
G. Engelhardt ◽  
A. Samoson ◽  
K. �jsz�szy ◽  
Yu. I. Smolin
Keyword(s):  
Silicic Acid ◽  
Trimethylsilyl Ester ◽  
Crystalline Silicic Acid

Adsorption of alkylamines by a crystalline silicic acid

Clay Minerals ◽  
1993 ◽  
Vol 28 (1) ◽  
pp. 39-48 ◽  
Author(s):  
J. Döring ◽  
G. Lagaly
Keyword(s):  
Silicic Acid ◽  
Adsorption Isotherms ◽  
Equilibrium Solution ◽  
Molar Fraction ◽  
Basal Spacing ◽  
Surface Excess ◽  
Adsorption Phase ◽  
Interlamellar Space ◽  
Crystalline Silicic Acid ◽  
Reduced Surface

AbstractAmines are strongly adsorbed by the crystalline silica H4Si20O42·4H2O and are intercalated into the interlayer spaces. The adsorption of butyl-, hexyl-, octyl-, and decylamine from alcoholic solutions (ethanol, butanol…decanol) is competitive as both types of molecules, amines and alcohols, are adsorbed in the interlamellar space. The adsorption isotherms are presented as composite isotherms showing the specific reduced surface excess of amine, n°(n)/m, as a function of the molar fraction of amine in the equilibrium solution. These isotherms increase to a plateau-like section (n°(n)/m≈1·4 mmol/g) when the interlamellar adsorption is restricted to formation of monolayers of flat-lying molecules (in water, ethanol and butanol). In the presence of longer chain alcohols, the isotherms increase stepwise to a second "plateau" (at n1°(n)/m = 2·2-2·7 mmol/g) which corresponds to paraffin-type bilayers of amine and alcohol molecules. The composition of the adsorption phase is estimated from the specific reduced surface excess of amine on the basis of the interlamellar structure derived from basal spacing measurements.

ChemInform Abstract: Preparation and Constitution of the Crystalline Silicic Acid Trimethylsilyl Ester ((CH3)3Si)6Si6O15.

ChemInform ◽  
1988 ◽  
Vol 19 (9) ◽  
Author(s):  
D. HOEBBEL ◽  
G. ENGELHARDT ◽  
A. SAMOSON ◽  
K. UJSZASZY ◽  
YU. I. SMOLIN
Keyword(s):  
Silicic Acid ◽  
Trimethylsilyl Ester ◽  
Crystalline Silicic Acid
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