Materials Literature
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First-order, rhombohedral to orthorhombic, stress-induced phase transitions have been evidenced by bulk charge-stress measurements and X-ray diffraction derived lattice strain measurements in [001]c-poled PZN-4.5PT. The transitions are induced by uniaxial, compressive loads applied either along or perpendicular to the…
The defining attribute of a diluted magnetic semiconductor (DMS) is the existence of dopant-carrier magnetic exchange interactions. In this letter, we report the first direct observation of such exchange interactions in colloidal doped CdSe nanocrystals. Doped CdSe quantum dots were synthesized by thermal decompositio…
AIMS: The lack of specificity of chemotherapeutic agents to cancer tissue commonly leads to dose-limiting side effects and poor therapeutic results. Drug delivery systems promise to improve the deficiencies of chemotherapeutic treatment by modifying the biodistribution and pharmacokinetics of the drug in vivo. Here, w…
The optical response from metal nanoparticles and nanostructures is dominated by surface plasmon generation and is critically dependent on the local structure and geometry. Electron energy-loss spectroscopy (EELS), combined with recent developments in spectrum imaging and data processing, has been used to observe the…
Semiconductorlike CaCu3Ti4O12 ceramic powders are filled into a poly(vinylidene fluoride-trifluoroethylene) copolymer matrix to form a flexible composite. The dielectric constant of the composites at 100 Hz reaches more than 600 at room temperature and 1200 at 70 °C, as shown in the figure. The contribution of the het…
A series of hypercrosslinked polymer networks has been synthesized by the self-condensation of bischloromethyl monomers such as dichloroxylene (DCX), 4,4‘-bis(chloromethyl)-1,1‘-biphenyl (BCMBP), and 9,10-bis(chloromethyl)anthracene (BCMA). These materials are predominantly microporous and exhibit Brunauer−Emmett−Tell…
Abstract Many of the recent advances in enhancing the thermoelectric figure of merit are linked to nanoscale phenomena found both in bulk samples containing nanoscale constituents and in nanoscale samples themselves. Prior theoretical and experimental proof‐of‐principle studies on quantum‐well superlattice and quantum…
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Abstract One new and three already described azobased methacrylate monomers with methoxy and nitro end groups and spacer length 2 and 6 were synthesized. These monomers were copolymerized with methyl methacrylate and the monomers as well as copolymers were characterized by classical spectroscopy techniques (FTIR, NMR,…
The approach based on the incubation time concept is used to analyze experimental data on acoustic cavitation in degassed water and in sea water. Earlier, a similar approach proved to be effective in analyzing the cavitation due to pulse loading and in studying the dynamic strength of solids. The proposed criterion ta…
Abstract Thermal degradation of the glycolide/trimethylene carbonate copolymer used for bioabsorbable surgical sutures (Maxon™) has been studied by isothermal and nonisothermal methods. Thermal decomposition always follows a single mechanism, although some differences have been found between the two performed analyses…
The preparation of Si1-xGex alloy nanocrystals via the simultaneous thermally induced disproportionation of hydrogen silsesquioxane and germanium diiodide is reported. The presented method affords oxide encapsulated nanocrystals that are readily liberated upon hydrofluoric acid etching to yield freestanding hydride su…
Abstract A novel hybrid film composed of copolyimide with hydroxyl group, silica and γ‐glycidyloxypropyltrimethoxysilane (CPI‐OH/SiO 2 /GOTMS) was prepared by the sol–gel process based on hydrolyzed tetraethoxysilane (TEOS) under acidic condition. GOTMS, as the coupling agent, and hydroxyl group in PI chain were used…
Iron is essential for the survival of almost all organisms, although excess iron can result in the generation of free radicals which are toxic to cells. To avoid the toxic effects of free radicals, the concentration of intracellular iron is generally regulated by the ferric uptake regulator Fur in bacteria. The 150 aa…
Composites consisting of magnetic shape memory (MSM) particles embedded in a polyester matrix were prepared. Single-crystalline MSM particles were obtained by mortar grinding of melt-extracted and subsequently annealed Ni50.9Mn27.1Ga22.0 (at. %) fibers. The crystal structure of the martensite is tetragonal (5M) with c…
The dehydratation process of layered lanthanide silicates K3[LnSi3O8(OH)2], Ln = Y, Eu, Tb, and Er, and the structural characterization of the obtained small-pore framework K3LnSi3O9, Ln = Y, Eu, Tb, and Er solids, named AV-23, have been reported. The structure of AV-23 has been solved by single-crystal X-ray diffract…
Oriented lamellar structures were developed in a blend of poly(1,4-butylene succinate) (PBSU) and poly(vinylidene fluoride) (PVDF), a miscible crystalline/crystalline polymer blend, by uniaxial compression flow using a pair of channel plates. The temperatures of the compression flow were varied in the range 140−163 °C…
In this paper, we present a new approach based on crystallization onto self-assembled multilayers (SAMs) for the control of polymorphism. To demonstrate our approach, we studied the crystallization of l -glutamic acid on a self-assembled multilayer of a phenyalanine derivative. It is shown that crystallization of l -g…
Received 16 March 2007DOI:https://doi.org/10.1103/PhysRevLett.98.129903©2007 American Physical Society
Abstract Polyaniline–polypyrrole (PANI‐PPy) composite was prepared by in situ polymerization of pyrrole in PANI dispersion using FeCl 3 ·6H 2 O as oxidant and sodium dodecyl benzene sulfonate (SDBS) as surfactant. Different synthesis conditions of PANI dispersion including the relative concentration of aniline and SDB…