ChemInform Abstract: CRYSTALLINE SILICIC ACID WITH HIGH INTERCALATION ABILITY

1985 ◽  
Vol 16 (12) ◽  
Author(s):  
K. BENEKE ◽  
H.-H. KRUSE ◽  
G. LAGALY
Keyword(s):  
Silicic Acid ◽  
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.

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

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

Notizen:Kernmagnetische Relaxationszeit-Messungen an OH-Protonen einer kristallinen Kieselsäure/ Nuclear Magnetic Relaxation Measurements on the OH-Protons of a Crystalline Silicic Acid

1975 ◽  
Vol 30 (10) ◽  
pp. 1330-1332 ◽  
Author(s):  
E. K.-H. Wittich ◽  
J. Voitländer ◽  
G. Lagaly
Keyword(s):  
Thermal Decomposition ◽  
Silicic Acid ◽  
Magnetic Relaxation ◽  
Interlayer Space ◽  
Relaxation Times ◽  
Water Molecules ◽  
Relaxation Processes ◽  
Relaxation Measurements ◽  
Silicate Layers ◽  
Crystalline Silicic Acid

Abstract The transversal relaxation times of the OH-protons of a crystalline silicic acid were measured. Two relaxation processes, clearly separated from each other, are related to the OH-protons in the silicate layers and to the OH-protons of water molecules in the interlayer spaces. From the initial magnetizations information is obtained about the water content in the interlayer space which does well agree with results given in thermal decomposition curves.

Characteristics Of The Structure Formation Of Gypsum Binder Modified With Zinc Hydrosilicates

2020 ◽  
pp. 40-46
Keyword(s):  
Synergistic Effect ◽  
Physicochemical Properties ◽  
Structure Formation ◽  
Silicic Acid ◽  
Chemical Properties ◽  
Crystal Formation ◽  
Ability To Act ◽  
Chemical Factors ◽  
Sorption Characteristics

The authors' methodic for assessing the role of chemical and physic-chemical factors during the structure formation of gypsum stone is presented in the article. The methodic is also makes it possible to reveal the synergistic effect and to determine the ranges of variation of controls factors that ensure maximum values of such effect. The effect of a micro-sized modifier based on zinc hydro-silicates on the structure formation of building gypsum is analyzed and corresponding dependencies are found. It is shown that effects of influence of modifier on the properties of gypsum compositions are determined by chemical properties of modifier. Among the mentioned properties are sorption characteristics (which depend on the amount of silicic acid and its state) and physicochemical properties - the ability to act as a substrate during crystal formation. The proposed method can also be extended to other binding substances and materials. This article contributes to the understanding of the processes that occur during the structure formation of composites, which will make it possible to control the structure formation in the future, obtaining materials with a given set of properties.

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