Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMesopore-Modified Zeolites: Preparation, Characterization, and ApplicationsYousheng Tao, Hirofumi Kanoh, Lloyd Abrams, and Katsumi KanekoView Author Information Department of Chemistry, Faculty of Science, Chiba University, Chiba 263, Japan, and DuPont Company, CR&D/CCAS, Ex…
By using bifunctional surface modifiers (SH-R-COOH), CdSe quantum dots (QDs) have been assembled onto mesoscopic TiO(2) films. Upon visible light excitation, CdSe QDs inject electrons into TiO(2) nanocrystallites. Femtosecond transient absorption as well as emission quenching experiments confirm the injection from the…
Abstract Copper acetylacetonate reacted with N , N ‐diethylmethylamine and 4,4′‐thiobis(6‐ t ‐butyl‐ o ‐cresol) in the presence of self‐assembled fluorinated oligmeric aggregates formed by fluoroalkyl end‐capped 2‐[3‐(2H‐benzotriazol‐2‐yl)‐4‐hydroxyphenyl]ethyl methacrylate– N , N ‐dimethylacrylamide cooligomer [R F –…
NiTi-wire shape memory alloy (SMA) dampers, that utilize NiTi SMA wires to simultaneously damp tension, compression and torsion, was developed for structural control implementation in this study. First, eight reduced-scale NiTi-wire SMA dampers were constructed. Then tension, compression and torsion experiments using…
Abstract The temperature–conductivity characteristics of poly(3‐hexylthiophene) (P3HT) composites filled with P3HT‐grafted indium tin oxide (ITO) particles were investigated in this work. The ITO particles were first treated with a silane coupling reagent of 3‐aminopropyltriethoxysilane (APS), and then thiophene rings…
Abstract Two kinds of monomers, 1,3‐bis[4‐(4′‐amino‐Phenoxy)cumyl]benzene (BACB) and pyromellitic dianhydride were used to synthesize the Liquid Crystalline Polyamic acid—a precursor (LCPAA) of Liquid Crystalline Polyimide (LCPi). The nanohybrid films were successfully prepared by the sol–gel reaction. Tetraethoxysila…
Abstract A two‐step procedure was used to synthesize the cellulose acetate butyrate and poly(ethylene glycol) graft copolymer (CAB‐ g ‐PEG). By choosing the appropriate composition, the crosslinked graft copolymer or not could be obtained. Then, the CAB‐ g ‐PEG copolymer was blended with poly(3‐hydroxybutyrate) (PHB),…
Abstract Subsequent melting behavior after isothermal crystallization at different temperatures from the isotropic melt and nonisothermal crystallization kinetics and morphology of partially melting sPB were carried out by differential scanning calorimetry (DSC), polarized light microscopy (POM), respectively. Triple…
Hexagonal wurtzite structure Tb(OH)(3) nanowires with a uniform diameter of about 70-80 nm and lengths of up to several micrometres have been synthesized on a large scale via a hydrothermal treatment based on the use of an anodic aluminium membrane as the template. Aligned Tb(OH)(3) nanowire arrays can be obtained by…
Abstract The influence of drawing on the limiting draw ratio upon formation of the morphological structure of fibers spun from binary polypropylene (PP) blends was studied. Fibers were spun from a fiber‐grade CR‐polymer and from the blends of a fiber‐grade CR‐polymer with a molding‐grade polymer in the composition ran…
Detailed density functional theory calculations were carried out to investigate the adsorption and dissociation of CO and H2O on Pd(111). The bonding of CO on the surface is found to be stronger that H2O. This finding does not support the previous suggestion that the stronger poisoning effect displayed by H2O on a Pd…
The contact resistance (Rcont) between nanotube and metal electrodes was directly measured in a four-terminal configuration of field-effect transistors for individual single-walled carbon nanotube (SWNT) bundles and a multiwalled carbon nanotube (MWNT). Both Rcont and the nanotube resistance (RNT) in a semiconducting…
The upconversion luminescence and dynamics in Er 3+ /Yb 3+ codoped nanocrystalline yttria (7–65 nm) are studied under 980-nm pulsed laser excitation. It is found that the red emission of 4 F 9/2 – 4 I 15/2 and the green emission of 2 H 11/2 / 4 S 3/2 in nanoparticles with lower concentration of Yb 3+ result from a two…
Uniform and step-shaped Bi nanowire (NW) arrays have been synthesized by electrochemical deposition inside the uniform and step-shaped nanochannels of an anodic aluminium oxide template. These Bi NWs are highly oriented and single crystalline. The current-voltage characteristics of the parallel uniform Bi nanowires sh…
Abstract An experimental study on batch cooling crystallization is presented here using four different materials, different seeding techniques, and different cooling profiles. The experimental results are analyzed with the aim of extracting some general rules for the dependence of seeding procedures on material proper…
Abstract The purification that can be attained via crystallization is on the one hand governed by kinetic factors, such as the growth rate, and can on the other hand be limited by thermodynamic factors, such as the formation of a solid solution of the impurity with the product. For organic substances, these solid solu…
Abstract Taking advantage of a melt polycondensation process, a series of copolyesters composed of pure terephthalate acid (PTA), ethylene glycol (EG), and 1,3‐propanediol (1,3‐PDO) were synthesized. The component, molecular weight, molecular weight distribution, and thermal properties of the copolymers were character…
Abstract Photo‐induced trans–cis isomerization of trans‐4‐methacryloyloxyazobenzene and its copolymer with methylmethacrylate, synthesized in this work, were investigated in a polar protic (CDCl 3 ) and a polar aprotic (DMSO‐ d 6 ) solvent, using 1 H‐NMR . The results were cross‐correlated with trans–cis isomerization…
We report a novel approach to grow highly oriented, freestanding and structured carbon nanotubes (CNTs) between two substrates, using microwave plasma chemical vapour deposition. Sandwiched, multi-layered catalyst structures are employed to generate such structures. The as-grown CNTs adhere well to both the substrate…
Abstract Crystals of lead sulfate were precipitated in solutions of various polyelectrolyte polymers (acidic, neutral, and basic polymers) using a double‐jet crystallizer. Polyetyleneimine (PEI) basic polymer controlled both the nucleation rate and crystal growth rate, and enabled the production of fine monodispersed…