Materials Literature
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Nitroxide-mediated radical polymerizations of 4-vinylpyridine and sodium 4-styrenesulfonate were carried out on the surfaces of MWNT to afford poly(4-vinylpyridine)-grafted MWNT (MWNT-P4VP) and poly(sodium 4-styrenesulfonate)-grafted MWNT (MWNT-PSS). The covalent bonding of polymers to the MWNT surface was confirmed b…
Compósitos de polipropileno com 10, 20 e 30% em volume de fibra de coco verde foram obtidos em câmara de mistura Haake, tendo como variáveis a temperatura de processamento e a velocidade de cisalhamento. O módulo de flexão e as características morfológicas dos diferentes compósitos obtidos foram avaliados e comparados…
We report an experimental and theoretical study of the stability and solution structure of lanthanide complexes with two novel ligands containing pyridine units and phosphonate pendant arms on either ethane-1,2-diamine (L2) or cyclohexane-1,2-diamine (L3) backbones. Potentiometric studies have been carried out to dete…
The aim of this work was to study the feasibility of hyperbranched polymers as drug carriers by employing different microparticle formation methods and the influence of loading methods on release kinetics. Commercially available hyperbranched polyester (Perstorp) and three polyesteramides (DSM) were loaded with the ph…
The synthesis of SiC hollow spheres is reported. The shell of the spheres is formed through a solid–gas reaction rather than traditional chemical methods. The sphere size can be modulated from the microscale to the nanoscale, and the shell thickness can be finely tuned by adjusting the experimental parameters. This te…
Phosphorus containing and octyl-terminated silicon nanoparticles (NPs) are generated by a solution reduction route under room temperature conditions for the first time and characterized by TEM, HRTEM, EDX, 1H/13C/31P NMR, EPR, and PL spectroscopy, then annealed to form a thin film with phosphorus doping confirmed by m…
Poly( o -phenylenediamine) (PoPD) has been successfully electropolymerized by cyclic voltammetery on 304 stainless steel from sulfuric acid solution containing o -phenylenediamine monomer. Thin, adherent, and transparent layers of PoPD which have a ladder conductive polymer structure were formed. The layers facilitate…
Polycrystal gadolinium lithium fluorides (GdLiF4=GLF) have been investigated as magnetic materials for an adiabatic demagnetization refrigeration (ADR) system operating at 4 K. Because of difficulties in growing a single crystal of GLF, a polycrystalline sample was fabricated and investigated. The relative density of…
This paper describes the design, modeling, initial build and testing of a novel thermoelectric power generator (TPG), incorporating state of the art material technology with optimized thermal management. A numerical model simulates the operation of the device and facilitates its design. Advanced multi-parameter, gradi…
Abstract The reaction of organoalkoxysilanes with sodium hydroxide was studied in detail. Studies indicate that this reaction involves more than one stage and involves rather complex multistep process, which leads to the formation of both monosodiumoxyorganoalkoxysilanes (MSOAS) and several secondary products. Analysi…
Abstract The use of photoresponsive hexatriene architectures to regulate chemical reactivity is described. The major focus of this report is how the two isomers of dithienylethene derivatives exhibit different steric and electronic properties. The ring-open form is structurally flexible, and the thiophene rings are el…
The synthesis and characterization of six symmetrical mesogenic dimers composed of bent-core molecules containing alkylene spacers are reported. The mesophase was characterized by polarizing optical microscopy, differential scanning calorimetry, X-ray diffraction and electric field experiments. The X-ray diffraction s…
Nanocrystalline niobium with a grain size of the order of magnitude of 100 nm has been produced by the method of severe plastic deformation (high-pressure torsion). The evolution of its structure at various annealing temperatures in the range of 400–800°C has been studied using transmission electron microscopy. It has…
Data on the synthesis and properties of NASICON complex phosphates M x A2(PO4)3 are summarized. The crystal chemistry and homology of these compounds are surveyed. The existence of large channels and numerous voids in the structure and various occupations of these voids by mobile cations generate many valuable physica…
We report a study of the effect of optical absorption on generation of coherent infrared radiation from mid-IR to THz region from GaSe crystal. The infrared-active modes of epsilon-GaSe crystal at 236 cm(-1) and 214 cm(-1) were found to be responsible for the observed optical dispersion and infrared absorption edge. B…
The oxidation of 1-octanethiol to corresponding disulfide as a model reaction for mercaptan sweetening was examined on the bifunctional catalysts prepared by supporting cobalt phthalocyanine tetrasulfonate (CoPcTs) on mixed-oxide solid bases (designated as Mg(Al)O) derived from thermal decomposition of Mg–Al hydrotalc…
A copolymer of diarylethene and trimethylsilyl-substituted p-phenylene vinylene (TPV) was synthesized to achieve photo-induced electrical change in a solid medium. The photo-isomerization of the polymer was induced by incorporating a 2,3-bis(2-methylbenzo[b]thiophen-3-yl)hexafluorocyclopentene (BTF) unit, while TPV un…
Understanding the elastic and plastic deformation properties of nanostructured metals requires the development of in situ testing methods that can follow the footprints of the deformation mechanism(s) during mechanical testing. Here we present an in situ synchrotron x-ray-diffraction technique which allows the measure…
Guest molecules of diethyl ether or methanol are reversibly encapsulated in cavities formed by the 3-dimensional supramolecular framework of heteropolynuclear, luminescent [Eu2Zn4L4(OAc)6(NO3)2(OH)2].2Et2O.
All of the copper in the layered oxysulfides Sr2MnO2Cu1.5S2 and Sr2MnO2CU3.5S3 may be extruded as the element and the copper ions replaced quasi-reversibly by lithium ions in reductive topotactic ion exchange reactions; dramatic changes in magnetic properties result.