scholarly journals Ion Exchange and Application of Layered Silicate

10.5772/51564 ◽  
2012 ◽  
Author(s):  
Kyeong-Won Park
Keyword(s):  
Ion Exchange ◽  
Layered Silicate

Structural and Antibacterial Properties of HyZnxNa2−xSi14O29 nH2O Layered Silicate Compounds, Prepared by Ion-Exchange Reaction

2018 ◽  
Vol 29 (3) ◽  
pp. 1029-1038 ◽  
Author(s):  
Adel Mokhtar ◽  
Amal Djelad ◽  
Abdelkader Bengueddach ◽  
Mohamed Sassi
Keyword(s):  
Ion Exchange ◽  
Exchange Reaction ◽  
Antibacterial Properties ◽  
Layered Silicate ◽  
Ion Exchange Reaction

Effect of Surface Modification on Strain Rate Sensitivity of Polypropylene/Muscovite Layered Silicate Composites

2014 ◽  
Vol 803 ◽  
pp. 343-347
Author(s):  
M.F. Omar ◽  
Nur Suhaili Abd Wahab ◽  
Hazizan Md Akil ◽  
Zainal Arifin Ahmad ◽  
Mohd Fadli Ahmad Rasyid ◽  
...  
Keyword(s):  
Surface Modification ◽  
Ion Exchange ◽  
Strain Rate ◽  
Strain Rate Sensitivity ◽  
Split Hopkinson Pressure Bar ◽  
Layered Silicate ◽  
Rate Sensitivity ◽  
Hopkinson Pressure Bar ◽  
Split Hopkinson ◽  
Pressure Bar

Surface modification is one of the treatment methods that can be implemented to improve the strain rate sensitivity of composite materials. In this study, both untreated and treated polypropylene/muscovite layered silicate composites were tested under static and dynamic loading up to 1100 s-1 using the universal testing machine and the split Hopkinson pressure bar apparatus, respectively. Muscovite particles were treated with lithium nitrate and cetyltrimethylammonium bromide as a surfactant through ion exchange treatment. Results show that the treated polypropylene/muscovite specimens with fine state of dispersion level shows better rate of sensitivity as compared to untreated polypropylene/muscovite specimens under a wide range of strain rate investigated. Apart from that, the rate of sensitivity of both tested polypropylene/muscovite layered silicate composites also show great dependency on the strain rate sensitivity was steadily increased with increasing strain rate. Unfortunately, the thermal activation values show contrary trend. Key words: Ion exchange treatment; Strain rate sensitivity; Muscovite particles; Split Hopkinson pressure bar apparatus; Strain rates

Layered silicate RUB-15 for efficient removal of UO22+ and heavy metal ions by ion-exchange

2017 ◽  
Vol 4 (9) ◽  
pp. 1851-1858 ◽  
Author(s):  
Zhe Chen ◽  
Yu Liang ◽  
Dashuang Jia ◽  
Wanying Chen ◽  
Zhimin Cui ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Ion Exchange ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Layered Silicate ◽  
High Adsorption ◽  
Efficient Removal

Layered silicate RUB-15 exhibited high adsorption abilities for not only UO22+ but also heavy metal ions through ion-exchange.

Effect of ion exchange treatment on dynamic compression properties of polypropylene/muscovite-layered silicate composites

2014 ◽  
Vol 29 (6) ◽  
pp. 867-889 ◽  
Author(s):  
Mohd Firdaus Omar ◽  
Hazizan Md Akil ◽  
Zainal Arifin Ahmad ◽  
Mohd Fadli Ahmad Rasyid ◽  
NZ Noriman
Keyword(s):  
Ion Exchange ◽  
Dynamic Compression ◽  
Layered Silicate ◽  
Compression Properties

scholarly journals Layered Silicate-Alginate Composite Particles for the pH-Mediated Release of Theophylline

2020 ◽  
Vol 13 (8) ◽  
pp. 182
Author(s):  
Uttom Nandi ◽  
Vivek Trivedi ◽  
Dennis Douroumis ◽  
Andrew P. Mendham ◽  
Nichola J. Coleman
Keyword(s):  
Ion Exchange ◽  
Sustained Release ◽  
Layered Silicate ◽  
Drug Carriers ◽  
Gastric Fluid ◽  
Simulated Gastric Fluid ◽  
Basal Spacing ◽  
Composite Particles ◽  
Simulated Intestinal Fluid ◽  
Synthetic Clay

Numerous natural and synthetic clay minerals have proven to be excellent drug carriers for high drug-loaded and sustained release formulations due to their considerable ion exchange, adsorption, and swelling capacities. Moreover, the synthetic smectite clays have added advantages in terms of compositional purity and controlled cation exchange capacity in comparison to natural clays. This study involves the intercalation of theophylline (TP) in a synthetic clay, Laponite® (LP), followed by the inclusion of the resulting intercalates into sodium alginate (SA) beads to achieve pH-controlled drug release. Maximum intercalated drug incorporation of 68 mg/g was obtained by ion exchange at pH 1.2 and confirmed by an increase in basal spacing of the clay from 12.9 to 15.5 Å. TP release from the binary LP-TP intercalates in simulated gastric fluid (SGF) and simulated intestinal fluid (SIF) was found to be 40% and 70%, respectively. LP-TP particles were also incorporated in an SA matrix via polymer crosslinking using CaCl2(aq) to improve the pH selective release. The ternary polymer-clay-drug composite particles effectively prevented the release of TP at low pH in SGF and resulted in sustained release in SIF, with 40% dissolution within 120 min.

Layered Silicate/ATBN Nanocomposite

1994 ◽  
Vol 351 ◽  
Author(s):  
A. Moet ◽  
A. Akelah ◽  
N. Salahuddin ◽  
A. Hiltner ◽  
E. Baer
Keyword(s):  
Ion Exchange ◽  
Layered Silicate ◽  
Domain Size ◽  
Binary Solvent ◽  
Polymer Molecules ◽  
Onium Salt ◽  
Average Domain Size ◽  
Average Size ◽  
Average Domain

ABSTRACTComposites of amine terminated butadieneacrylonitrile (ATBN) and montmorillonite (MMT) were prepared by ion exchange between the onium salt of the polymer and the interlamellar cation of the mineral following two different preparation approaches. The first carried out the ion exchange in situ and used dioxane, a better solvent for the polymer, and the second administered the onium salt to MMT using dimethylsulfoxide (DMSO). Elemental analysis and IR spectroscopy indicated that all the ionic sites of the mineral have been occupied by polymer end groups. The d (001) spacing and the span between the internal lamelar surface were only expanded to about 14 Å and 5 Å, respectively, suggesting horizontal packing of the polymer molecules. TEM of microtome sections prepared from compression molded composites revealed that the lamellae, laminated with polymers assembled into multiplets of about 5 nm for both preparations. The multiplets clustered into mineral rich domains whose average size was 250 nm for the DMSO preparation. Finer clusters (70 nm) were obtained by the first method. This three fold decrease in the average domain size was attributed to the strong solvation power of dioxane in the binary solvent and to the locale of ion exchange.

Embedding Procedure for Water Swollen Samples

1970 ◽  
Vol 28 ◽  
pp. 504-505
Author(s):  
Ann M. Thomas ◽  
Virginia Shemeley
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Ion Exchange ◽  
Structural Changes ◽  
Cross Linking ◽  
Ion Exchange Resins ◽  
Transmission Electron ◽  
First Pass ◽  
Exchange Resins

Those samples which swell rapidly when exposed to water are, at best, difficult to section for transmission electron microscopy. Some materials literally burst out of the embedding block with the first pass by the knife, and even the most rapid cutting cycle produces sections of limited value. Many ion exchange resins swell in water; some undergo irreversible structural changes when dried. We developed our embedding procedure to handle this type of sample, but it should be applicable to many materials that present similar sectioning difficulties.The purpose of our embedding procedure is to build up a cross-linking network throughout the sample, while it is in a water swollen state. Our procedure was suggested to us by the work of Rosenberg, where he mentioned the formation of a tridimensional structure by the polymerization of the GMA biproduct, triglycol dimethacrylate.

Ion-exchange separation of titanium from steels and its determination with hydrogen peroxide

1960 ◽  
Vol 23 ◽  
pp. 438-440 ◽  
Author(s):  
V ATHAVALE ◽  
M NAPKARNI ◽  
C VENKATESWARLU
Keyword(s):  
Hydrogen Peroxide ◽  
Ion Exchange ◽  
Ion Exchange Separation

Studies on ion-exchange membranes.Part 1. Effect of humidity on the conductivity of Nafion®

1996 ◽  
Vol 414 (2) ◽  
pp. 115-120 ◽  
Author(s):  
A.V. Anantaraman ◽  
C.L. Gardner
Keyword(s):  
Ion Exchange
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