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71.
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Landau A. Zaban A. Lapides I. Yariv S. 《Journal of Thermal Analysis and Calorimetry》2002,70(1):103-113
The mechanochemical solid-state adsorption of the cationic dye rhodamine-6G (R6G) by montmorillonite was investigated by XRD
and simultaneous DTA-TG. Five different mixtures of R6G and montmorillonite were investigated. They contained 10, 20, 35,
50 and 100 mmol R6G per 100 g clay. The solid R6G was ground with the clay for five minutes. Mixtures were ground both in
the absence of water (dry grinding) and with the adding of drops of water periodically, (wet grinding). There were no differences
between samples obtained by wet or dry grinding. X-ray and DTA data were compared with those of R6G-montmorillonite obtained
from aqueous suspensions. The mechanochemical products were different from those obtained from aqueous suspensions. The X-ray
and DTA studies suggest that the mechanochemical adsorption of organic cations takes place on the external surfaces of the
clay whereas in suspensions the adsorption takes place into the interlayer space. In the latter case the final stages of oxidation
occur in temperatures higher than those of the neat dye whereas in the former they occur at lower temperatures.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
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Edmund Landau 《Mathematische Zeitschrift》1929,30(1):635-638
Ohne Zusammenfassung 相似文献
76.
Stimuli‐Responsive Lipidic Cubic Phase: Triggered Release and Sequestration of Guest Molecules
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Dr. Nelli Rahanyan‐Kägi Dr. Simone Aleandri Chiara Speziale Prof. Raffaele Mezzenga Prof. Ehud M. Landau 《Chemistry (Weinheim an der Bergstrasse, Germany)》2015,21(5):1873-1877
New stimuli‐responsive nanomaterials, made up of host–guest lipidic cubic phases (LCPs) are presented. These biocompatible, stable, transparent and water‐insoluble LCPs are composed of monoolein (MO) as a neutral host, and small amounts of one of three judiciously designed and synthesized designer lipids as guest that preserve the structure and stability of LCPs, but render them specific functionalities. Efficient pH‐ and light‐induced binding, release and sequestration of hydrophilic dyes are demonstrated. Significantly, these processes can be performed sequentially, thereby achieving both temporal and dosage control, opening up the possibility of using such LCPs as effective carriers to be used in drug delivery applications. Specifically, because of the inherent optical transparency and molecular isotropy of LCPs they can be envisaged as light‐induced drug carriers in ophthalmology. The results presented here demonstrate the potential of molecular design in creating new functional materials with predicted operating mode. 相似文献
77.
Edmund Landau 《Mathematische Annalen》1906,63(2):145-204
Ohne Zusammenfassung 相似文献
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This paper describes an edge‐based implementation of the generalized residual minimum (GMRES) solver for the fully coupled solution of non‐linear systems arising from finite element discretization of shallow water equations (SWEs). The gain in terms of memory, floating point operations and indirect addressing is quantified for semi‐discrete and space–time analyses. Stabilized formulations, including Petrov–Galerkin models and discontinuity‐capturing operators, are also discussed for both types of discretization. Results illustrating the quality of the stabilized solutions and the advantages of using the edge‐based approach are presented at the end of the paper. Copyright © 2001 John Wiley & Sons, Ltd. 相似文献
80.
Using the mathematical structure of riggedHilbert spaces, for both in and out Fock spaces of asimple cosmological model, we verify the tworequirements for classicality: decoherence andcorrelations. 相似文献