Materials Literature
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Recent studies on the physical properties of the triangular system based on the Pd(dmit)2 salts (dmit=1,3-dithiole-2-thione-4,5-dithiolate) are reviewed. Quantum chemical architectures of the Pd(dmit)2 molecule and its dimer are introduced with emphasis on the strong dimerization of a two-level system, which provides…
Tailoring the interaction between surfaces and nanoparticles (NPs) affords great opportunities for a range of applications, including sensors, information storage, medical diagnostics, and filtration membranes. In addition to controlling local ordering and microscale patterning of the NPs, manipulating the temporal fa…
International audience
Research Article| April 01, 2009 Bentonites - Clays for Molecular Engineering Necip Güven Necip Güven *Center for Nanophase Research, IEIS Texas State University, San Marcos, Texas 78666-4616, USA E-mail: ng13@txstate.edu Search for other works by this author on: GSW Google Scholar Elements (2009) 5 (2): 89–92. https:…
New in situ Raman and synchrotron X-ray diffraction data (between 300 and 400 K) in conjunction with separate temperature-dependent Raman data (between 7 and 400 K) are presented. The low-frequency Raman spectra show good agreement with theoretical values obtained previously using periodic DFT calculations. The temper…
Abstract Cubic and octahedral Cu2O nano‐ and microcrystals were selectively synthesized via a simple wet chemical reduction route at room temperature, with CuCl2 and NaOH as starting reactants, and ascorbic acid or hydrazine hydrate as the reducer. Hydrazine hydrate could be preferentially adsorbed on different crysta…
Porphyrins and other pyrrolic macrocycles can participate in a range of pericyclic reactions. This review deals mainly with their use in Diels-Alder reactions (as dienes and dienophiles) and in 1,3-dipolar cycloadditions (as 1,3-dipoles and dipolarophiles)
The influence of branching architecture on the glass transition of hyperbranched polyethers has been investigated. For amorphous samples, the glass transition temperature (T(g)) first increases with the degree of branching (DB), passes through a maximum, and then decreases sharply. An attempt is made to explain this b…
The method of virtual power is generally used to produce balance equations for non-traditional continua such as, for example, continua with various types of microstructure. \n Here I show that the expression of the internal power can be deduced from that of the external power using a general invariance requirement due…
Structural, magnetic, and electrical properties of Bi1−xPbxFeO3 (x=0, 0.1, 0.2, and 0.3) polycrystalline prepared by solid solution route were studied. The crystal structure data obtained from x-ray diffraction indicate that the solid solution Bi1−xPbxFeO3 successively transforms from rhombohedral to pseudocubic symme…
Radiation conditions are described for various space regions, radiation-induced effects in spacecraft materials and equipment components are considered and information on theoretical, computational, and experimental methods for studying radiation effects are presented. The peculiarities of radiation effects on nanostr…
Phosphors with various color mechanoluminescence (ML) europium-activated SrAMgSi 2 O 7 (A=Ca, Sr, Ba) were reported in this paper. The results reveal that the ML emission bands are located at 440, 460, and 499 nm for SrBaMgSi 2 O 7 :Eu, Sr 2 MgSi 2 O 7 :Eu, and SrCaMgSi 2 O 7 :Eu, respectively, which is similar to the…
We report the synthesis of spherical core-shell structures of silicon and silicon oxide by a novel route of forced external oxidation of ball milled silicon. Structural investigations reveal the formation of a crystalline silicon core surrounded by an amorphous oxide shell, with core and shell dimensions varying appro…
Once again the world of condensed matter has been surprised by the discovery of yet another class of high-temperature superconductors. The first reactions would of course be that these iron-pnictide– and iron-chalcogenide–based materials must in some way be related to the copper-oxide–based superconductors for which a…
Abstract A natural sample from the Dragon Mine, Tintic District, Silver City, Utah (USA), has been characterised. It contains a mixture of halloysite and alunite. The former shows the characteristic tubularly shaped particles while the latter is found to crystallise in platy particles. The crystal structure of halloys…
This study investigated the effect of lipid types (oleic acid, palm oil, and margarine) and their concentrations (0, 10, 20, 30, 40, and 50wt%) on the water vapor permeability (WVP), tensile strength (TS), percentage of elongation at break (%E), and structure of emulsified rice starch-chitosan composite film. The infl…
Microbiologically influenced corrosion (MIC) is one of a number of threats to the long-term integrity of nuclear waste containers. As such, the potential for, and extent of, MIC must be assessed and suitable models developed for predicting the long-term behavior of the container. There are two broad approaches to asse…
This paper studies the size effect in the transverse deformation of nanowires or nanoropes subjected to flexural bending. Based on the classic strain-gradient theory, a continuum approach is proposed, in which the strain energy was expressed in terms of the linear strains and strain gradients, and two additional pheno…
Abstract Glauconitic minerals are considered as one of the valuable input parameters in sequence stratigraphic analysis of a basin. In the present study glauconitic minerals are reported from subtidal green shale facies in the lower part of the Late Paleocene-Early Eocene Naredi Formation of western Kutch. On the basi…
The importance and complexity of energy and electron transfer reactions in biological and artificial light energy conversion systems have prompted the preparation and photophysical study of donor-acceptor (D-A) molecular models. This article aims to highlight the efforts of Portuguese and Spanish research groups on th…