Materials Literature
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Textured Nb‐doped bismuth titanate ceramics (Bi 4 Ti 3− x /5 ‐ Nb x /5 O 12 , where x = 0.02) were fabricated by templated grain growth. It was found that the use of a fine precursor powder led to enhanced densification of the ceramic, while Nb doping reduced electrical conduction and dielectric loss, which enabled po…
Two new Keggin unit supported transition metal complexes, [Ni(2,2′-bipy)3]1.5[PW12O40Ni(2,2′-bipy)2(H2O)]·0.5H2O 1 and [Co(1,10′-phen)3]1.5[PMo12O40Co(1,10′,-phen)2- (H2O)]·0.5H2O 2, are synthesized by a hydrothermal method; complex 1 is characterized by X-ray crystallography, showing that the [Ni(2,2′-bipy)2(H2O)]2+…
The microstructure and shape-memory properties of norbornyl–POSS hybrid copolymers having either cyclohexyl corner groups (CyPOSS) or cyclopentyl corner groups (CpPOSS) were investigated by transmission electron microscopy and thermomechanical analysis. Here, POSS refers to the polyhedral oligomeric silsesquioxane mac…
Abstract Basic characteristics of heteropolyacids as green catalysts are overviewed, focusing on the various reaction fields in which the heteropolyacid catalysts function as acid and oxidation catalysts, and then two industrial processes which were made very green by the use of heteropolyacid catalysts in liquid biph…
Hollow spheres of zeolite have been fabricated through a layer-by-layer technique using polystyrene spheres as templates and nanozeolites as ‘building blocks’, followed by calcination.
A comprehensive and systematic study on Sm(Co/sub bal/Fe/sub v/Cu/sub y/Zr/sub x/)/sub z/ magnets is made to completely understand the effects of composition and processing on their magnetic properties. These studies include the compositions required for the formation of cellular/lamellar microstructure, the effects o…
A crucial factor in tissue engineering of heart valves is the type of scaffold material. In the following study, we tested three different biodegradable scaffold materials, polyglycolic acid (PGA), polyhydroxyalkanoate (PHA), and poly-4-hydroxybutyrate (P4HB), as scaffolds for tissue engineering of heart valves. We mo…
The optical and electronic properties of the phthalocyanine (Pc) macrocycle make it suitable for a wide range of applications. The enormous diversity of Pc-containing polymers, developed over thirty years of research, offers the prospect of readily processed materials in which covalent linkages can be used to control…
Several kinds of bromo substituted organic conjugation compounds including chalcones, α-cinnamylideneacetophenones, benzophenones, stilbenes and diphenylacetylenes have been synthesized, and their powder second harmonic generation (SHG) efficiency, cut-off wavelength λcut-off and thermal stability have been studied. T…
Block copolymers are well-known for their large number of microphase morphologies on mesoscopic length scales. After a short review of the different morphologies observed in binary block copolymers and ternary triblock copolymers, the self-assembling in blends of different block copolymers into common superlattices is…
The crystal chemistry of Fe in four nontronites (Garfield, Panamint Valley, SWa-1, and NG-1) was investigated by chemical analysis, X-ray goniometry, X-ray absorption pre-edge spectroscopy, powder and polarized extended X-ray absorption fine structure (EXAFS, P-EXAFS) spectroscopy, and X-ray diffraction. The four refe…
Microporosity within the pore walls of ordered mesoporous silica SBA-15 was confirmed by physisorption; the micropore volume could be systematically controlled by varying the synthesis temperature and the TEOS/surfactant ratio.
Current understanding of the mechanism of sonodynamic action (i.e. the ultrasound-dependent enhancement of the cytotoxic action of certain drugs--sonosensitizers) with potential applications for cancer therapy is presented. The experimental evidence suggests that sonosensitization is due to the chemical activation of…
This short review focuses on recent advances in controlled polymerization and macromolecular architectonics by means of a variety of organized media with constrained geometries.
The overwhelming basicity of all analysed surfaces strongly dependent on the choice of liquid triplet used for contact angle measurements and the negative values sometimes obtained for the square roots of the acid-base parameters can be summarized as the main problems arising from the application of the Good-van Oss-C…
Novel polymer biomaterials, which can be used in contact with blood, are prepared with strong inspiration from the surface structure of biomembrane. That is, the polymers with a phospholipid polar group in the side chain, 2-methacrylooyloxyethyl phosphorylcholine (MPC) polymers were synthesized. The MPC polymers can i…
We present a comprehensive theory of the magnetization relaxation in a ${\mathrm{Mn}}_{12}$-acetate crystal in the high-temperature regime $(T\ensuremath{\gtrsim}1 \mathrm{K}),$ which is based on phonon-assisted spin tunneling induced by quartic magnetic anisotropy and weak transverse magnetic fields. The overall rela…
A commercially important synthetic approach to highly ordered mesoporous silica materials (SBA-family) with 2-D hexagonal (P6mm), 3-D hexagonal (P63/mmc) and cubic (Im3m and Pm3m) structures, using sodium silicate as the silica source and amphiphilic block copolymers as the structure-directing agents is demonstrated.
For the latter half of the ‘Solid State 20th Century’ materials science has been the engine that propelled technology. As we enter the ‘Materials 21st Century’ it is abundantly clear that the insatiable demand for new materials for emerging technologies is driving materials synthesis and change. Materials chemistry wi…
Although nitinol is one of most popular materials of intravascular stents, there are still few confirmative biocompatibility data available, especially in vascular smooth muscle cells. In this report, the nitinol wires were corroded in Dulbecco's modified Eagle's medium with constant electrochemical breakdown voltage…