Results 171 to 180 of about 6,629 (204)

Mössbauer Studies of Palygorskite and Some Aspects of Palygorskite Mineralogy

Clays and Clay Minerals, 1981
AbstractFe3+ ions in palygorskite occupy sites at the edges and in the interior of the alumino-silicate chains. The Mössbauer parameters of the doublets associated with Fe3+ ions in edge sites indicate that the sites have a regular 6 coordination. Fe3+ ions in the interior of the chains occupy M(1) sites in three of the samples examined and M(2) sites ...
L. Heller-Kallai, I. Rozenson
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Synthesis, Characterization and Swelling Behaviour of Poly(sodium acrylate)/Palygorskite Superabsorbent Composites based on Palygorskite and Organo-palygorskite

Journal of Polymer Engineering, 2009
Novel superabsorbent composites based on partially neutralized acrylic acid (SA) and palygorskite (PLG) were synthesized by aqueous solution polymerization. The effects of PLG, organo-PLG (O-PLG) and the content of PLG in the copolymeric gels on the water sorption and the initial swelling rate in deionized water and saline solution (0.2 wt% NaCl (aq) )
F. Santiago, A.E. Mucientes, B. Talavera
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Structure defects in palygorskite

Clay Minerals, 1984
It is well established that palygorskite has an amphibole-like, double-chain structure. The linked tetrahedral groups forming continuous sheets are divided into ribbons of various widths due to alternation of the direction of tetrahedra which run parallel to the fibre axis (Brindley, 1980).
S. Lokanatha, S. Bhattacherjee
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Dehydration Transformation in Palygorskite

Transactions of the Indian Ceramic Society, 1984
Structural changes accompanying dehydration and thermal transformations in palygorskite have been critically reviewed. Salient features of the dehydration mechanisms proposed by various authors have been discussed. Results of some X-ray and electron microscopic studies made by the authors on this problem, clarifying some points in greater detail, have ...
S. Bhattacherjee, S. Lokanatha
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Thermal analysis of palygorskite

Thermochimica Acta, 1975
Abstract Slickensides and fissures in a fresh outcrop of silicified limestones at the Burgenstock (Switzerland) contained palygorskite. According to TG, DTA and heating X-ray experiments, dehydration of the palygorskite took place in four steps. Each step clearly showed an alteration in the unit cell dimensions.
W. Hirsiger, M. Müller-Vonmoos, H.G. Wiedemann   +2 more
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Sepiolite–Palygorskite Occurrences in Turkey

2011
Abstract Sepiolite–palygorskite occurrences and deposits in Turkey can be classified as sedimentary (marine and lacustrine), hydrothermal and pedogenic types based on their geological settings and mineralogical features. Marine types are formed within the evaporative clayey–sandy-carbonate rocks of Upper Cretaceous–Lower Miocene in the shallow ...
Yalcin, Huseyin, Bozkaya, Omer
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Enhancing mechanical properties of palygorskite/styrene–butadiene rubber nanocomposites via regulating palygorskite structure

Journal of Alloys and Compounds, 2017
Abstract In this work, the effects of the rotating speed, the ball to material ratio and ball-milling time on the mechanical performance of palygorskite filled styrene butadiene rubber composites were intensively investigated through orthogonal experiments, using modified palygorskite powders of different structures and morphologies as reinforcement ...
Qingguo Tang, Fei Wang, Yang Yang, Mengran Tang, Zhaogang Zeng, Jinsheng Liang   +5 more
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Sonochemical preparation of palygorskite nanoparticles

Applied Clay Science, 2011
Palygorskite nanoparticles were prepared by sonochemical reaction. The products were characterized by X-ray fluorescence analysis (XRF), X-ray powder diffraction (XRD), thermal gravimetry analysis (TGA), differential thermal analysis (DTA) and infrared spectroscopy.
Zahra Darvishi, Ali Morsali
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Palygorskite organophilic for dermopharmaceutical application

Journal of Thermal Analysis and Calorimetry, 2013
Due to the growing interest of the population in natural treatments, the clays represent a good alternative to the treatment of wounds. Its modification by organophilization happens when the same inorganic cations are exchanged for organic cations of the surfactant used in the process.
Mirna Luciano de Gois da Silva, Amanda Campos Fortes, Marília Evelyn Rodrigues Oliveira, Rivelilson Mendes de Freitas, Edson C. da Silva Filho, Monica Felts de La Roca Soares, José Lamartine Soares-Sobrinho, Cleide Maria da Silva Leite   +7 more
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Silanized palygorskite for lipase immobilization

Journal of Molecular Catalysis B: Enzymatic, 2009
Abstract Lipase from Candida lipolytica has been immobilized on 3-aminopropyltriethoxysilane-modified palygorskite support. Scanning electron micrographs proved the covalently immobilization of C. lipolytica lipase on the palygorskite support through glutaraldehyde.
Jianhua Huang, Yuanfa Liu, Xingguo Wang
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