Zur Synthese von kristallinen Metallsilicathydraten mit Schichtstruktur

Schwieger, Wilhelm; Heyer, W. Ronald; Wolf, Friedrich; Bergk, K.‐H.

doi:10.1002/zaac.19875480523

Cited by 29 publications

(9 citation statements)

References 14 publications

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“…The influence of the medium components zinc and magnesium on the Freundlich parameters 1/n and K ads of silicate adsorption was determined. Both zinc and magnesium are able to form a complex with silicate, and zinc has a profound influence on silicate polymerization [7,[20][21][22][23][24]. So it can be expected that both zinc and magnesium will influence the affinity K ads , and that zinc will influence the order of the adsorption reaction 1/n in high-Si media.…”

Section: Interaction Of Metal Ions With Adsorbed Silicatementioning

confidence: 99%

“…This could be due to the focus on biological processes (e.g., in enzymes or binding sites) so far, while the indirect role of silicon via (physical) chemical processes could be far more important [19]. Namely, silicate molecules in solution show a rich chemistry, including adsorption, (de)polymerization reactions and complex formation with metal ions [7,[20][21][22][23][24]. Probably silicate could play a role in organisms by its chemical interactions with metal ions.…”

Section: Introductionmentioning

confidence: 99%

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On the Beneficial Role of Silicon to Organisms: A Case Study on the Importance of Silicon Chemistry to Metal Accumulation in Yeast

Brasser

Krijger

Wolterbeek

2008

Biol Trace Elem Res

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Silicon is involved in numerous important structural and functional roles in a wide range of organisms, including diatoms, plants, and humans, but clear mechanisms have been discovered only in diatoms and sponges. Silicate availability influences metal concentrations within various cell-and tissue-types, but a mechanism has not been discovered so far. In an earlier study on Baker's yeast Saccharomyces cerevisiae it was proposed that a chemical mechanism, rather than a biological one, is important. In the present study, the interaction of silicon with Baker's yeast is further investigated by studying the influence of zinc and magnesium on Si accumulation both at a low and a high silicate concentration in the medium. Si accumulation fitted well with Freundlich adsorption and Si release followed depolymerization kinetics, indicating that silicate adsorbs to the surface of the cell rather than being transported over the cell membrane. Subsequently, adsorbed silicate interacts with metal ions and, therefore, alters the cell's affinity for these ions. Since several metals are nutritional, these Si interactions can significantly change the growth and viability of organisms. In conclusion, the results show that chemistry is important in Si and metal accumulation in Baker's yeast, and suggest that similar mechanisms should be studied in detail in other organisms to unravel essential roles of Si.

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Section: Interaction Of Metal Ions With Adsorbed Silicatementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

On the Beneficial Role of Silicon to Organisms: A Case Study on the Importance of Silicon Chemistry to Metal Accumulation in Yeast

Brasser

Krijger

Wolterbeek

2008

Biol Trace Elem Res

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“…Among the anhydrous alkali silicates only natrosilite, Na 2 [17][18][19][20]. A characteristic property of these silicates is their cation exchange capacity (see Section 1.4.4).…”

Section: Alkali Silicatesmentioning

confidence: 99%

Silicates

Lagaly¹,

Tufar²,

Minihan³

et al. 2000

Ullmann's Encyclopedia of Industrial Chemistry

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The article contains sections titled: 1. Structural Chemistry of Silicates 1.1. Structural Classification 1.2. Oligo‐ and Cyclosilicates 1.3. Polysilicates 1.4. Phyllosilicates 1.4.1. Monophyllosilicates 1.4.2. Diphyllosilicates 1.4.3. Alkali Silicates 1.4.4. Crystalline Silicic Acids 1.4.5. Clay Minerals 1.4.6. Intracrystalline Reactions 1.5. Tectosilicates 2. Natural Silicates 2.1. Feldspar 2.1.1. Structure and Composition 2.1.2. Characterization of Individual Feldspars 2.1.3. Production 2.1.4. Properties 2.1.5. Mineral Deposits and their Extraction 2.1.6. Processing and Quality Requirements 2.1.7. Uses and Economic Aspects 2.2. Nepheline and Related Compounds 2.3. Leucite 2.4. Olivine 2.5. Andalusite 2.6. Kyanite 2.7. Sillimanite 2.8. Mullite 2.9. Vermiculite 2.10. Perlite 2.11. Pumice 2.12. Basalt 2.13. Wollastonite 2.14. Toxicology 3. Alkali Silicates 3.1. Introduction 3.2. Raw Materials 3.3. Amorphous Anhydrous Alkali Silicates (Solid or Lump Glasses) 3.4. Silicate Solutions 3.5. Hydrated Water‐Soluble Silicates 3.6. Crystalline Solids 3.7. Uses and Applications 3.8. Economic Aspects 3.9. Storage, Safety, Labelling and Transportation 3.10. Analysis

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“…Dabei wird die iJberragende F~ihigkeit dieses Metall-silikathydrats zum Ionenaustausch genutzt [17,18]. Berichtet wird auch fiber klassische Einsatzm6glichkeiten als Adsorptionsmittel, Katalysator bzw.…”

Section: Fundortunclassified

Thermoanalytische Untersuchungen an aluminiumfreien Schichtsilikaten

Schwieger

Grabner

Utschick

et al. 1996

Journal of Thermal Analysis

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Aluminium-free layered silieate hydrates (metal silicate hydrates -M-SH) are an interesting supplement to the well-known zeolite-like porous materials, due to their large number of catalytic, adsorptive and ion-exehange properties. By means of a eombination of X-ray diffraction investigations and several thermo-analytic methods ('I"t3, DSC, TMA) it could be shown that the properties of magadiite will be influenced by the cations located in the interlayer and the morphology of the as-synthesized magadiite products. In particular, hydration behaviour and phase transformation behaviour of the magadiite will be affected. Thus, H-and Ce-magadiite are stable up to temperatures of about 800"C, while the as-synthesized Na-forms will loss water irreversible already at about 200"C, will be dehydroxylated, and will be decomposed structurally at about 400~

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Zur Synthese von kristallinen Metallsilicathydraten mit Schichtstruktur

Cited by 29 publications

References 14 publications

On the Beneficial Role of Silicon to Organisms: A Case Study on the Importance of Silicon Chemistry to Metal Accumulation in Yeast

On the Beneficial Role of Silicon to Organisms: A Case Study on the Importance of Silicon Chemistry to Metal Accumulation in Yeast

Silicates

Thermoanalytische Untersuchungen an aluminiumfreien Schichtsilikaten

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