Author
A.S. Medina
Bio: A.S. Medina is an academic researcher from Ohio University. The author has contributed to research in topics: Ion exchange & Zirconium phosphate. The author has an hindex of 4, co-authored 4 publications receiving 271 citations.
Topics: Ion exchange, Zirconium phosphate, Zirconium, Phosphate, Potassium
Papers
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184 citations
TL;DR: In this paper, the ion exchange behavior of α-zirconium phosphate crystals titrated with potassium ion and the behavior of the potassium-exchanged forms with HCl has been examined.
50 citations
TL;DR: This article showed that α-Zirconium phosphate (α-ZrP) for long periods of time leads to the formation of two new phases ζ-ZRP and η-ZρP.
36 citations
TL;DR: The isotherms for Na+/K+ exchange on crystalline α-zirconium phosphate have been determined at several pH values as mentioned in this paper, and the isotherm at pH 9 exhibits a more pronounced hysterisis and this is attributed to the uptake of some hydrogen ion by the exchanger.
8 citations
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TL;DR: A review of the state-of-the-art in the field of starch-based nano-biocomposites can be found in this article, where various types of nanofillers that have been used with plasticised starch are discussed such as phyllosilicates, hectorite, sepiolite, etc.
444 citations
TL;DR: In this article, the authors discuss the preparation and use of synthetic clays in polymeric nanocomposites (PNCs), i.e., in the polymeric matrix.
Abstract: Thisreviewdiscusses preparationanduseofthesyntheticlayerednanoparticlesinpolymermatrices, i.e., in the polymeric nanocomposites (PNCs). Several types of synthetic or semi-synthetic layered materials are considered, namely the phyllosilicates (clays), silicic acid (magadiite), layered double hydroxides (LDHs), zirconium phosphates (ZrPs), and di-chalcogenides. The main advantage of synthetic clays is their chemical purity (e.g. absence of amorphous and gritty contaminants, as well as arsenic, iron, and other heavy metals), white to transparent color that assures reproducibly of brightly colored products, as well as a wide range of aspect ratios, p ¼ 20 to £6000. Several large scale production facilities have been established. The synthetic clay and LDH industries are oriented toward big volume markets: catalysis, foodstuff, cosmetics, pharmaceuticals, toiletry, etc. The use of these materials in PNCs is limited to synthetic clays and LDHs, mainly for reinforcement, permeability control, reduction of flammability, and stabilization, e.g. during dehydrohalogenation of chlorinated macromolecules. The use of lamellar ZrPs and di-chalcogenides is at the laboratory stage of functional polymeric systems development, e.g. for electrically conductive materials, catalysts or support for catalysts, in photochemistry, molecular and chiral recognition, or in fuel cell technologies, etc. Copyright # 2007 John Wiley & Sons, Ltd.
389 citations
TL;DR: Die Ubersicht schliesst die Herstellung, Eigenschaften, Anwendbarkeit and Theorie of diesen Substanzen ein.
354 citations
347 citations
TL;DR: In this article, the properties of both amorphous and crystalline salts of tetravalent metals are reviewed, with special emphasis on the much studied salt of zirconium phosphate.
Abstract: Properties of both amorphous and crystalline salts of tetravalent metals are reviewed, with special emphasis on the much studied salt of zirconium phosphate. The discussion includes: (1) method of preparation, (2) interlayered crystal structure, (3) effect of counter ions on interlayer distance and steric hindrance, (4) mechanism of ion exchange, and (5) the interaction of polar molecules. Other insoluble acid salts with a layered structure include the phosphates of titanium, hafnium, germanium, tin, lead, and the arsenates of titanium, zirconium, and tin. Fibrous precipitates of the insoluble acid salts of cesium and thorium phosphate are mentioned briefly. Under appropriate experimental conditions, insoluble acid of unknown structure can be obtained. Investigations of their crystalline structure may be highly desirable. The ion exchange capacities of many of these substances are evaluated. 80 references, 3 tables, 4 figures.
243 citations