Materials Literature
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The influence of Co2+ ions on the homogeneous nucleation of ZnO is examined. Using electronic absorption spectroscopy as a dopant-specific in-situ spectroscopic probe, Co2+ ions are found to be quantitatively excluded from the ZnO critical nuclei but incorporated nearly statistically in the subsequent growth layers, r…
Phthalocyanine−perylene derivative blends present a homogeneous columnar hexagonal mesophase in a wide temperature range. This mesophase is highly stabilized and ordered compared to the one of pure phthalocyanine.
The origin of the insulating ground states and the charge disproportionation in the two Fe-based perovskite oxides, viz., $\mathrm{Ca}\mathrm{Fe}{\mathrm{O}}_{3}$ and ${\mathrm{La}}_{1∕3}{\mathrm{Sr}}_{2∕3}\mathrm{Fe}{\mathrm{O}}_{3}$, are examined from ab initio electronic structure calculations based on the density-…
Aluminum titanate (Al 2 TiO 5 ) is a promising engineering material because of its low thermal expansion coefficient, excellent thermal shock resistance, good refractoriness, and nonwetting with most metals. However, it is susceptible to thermal dissociation in the temperature range of 800°–1280°C, which degrades its…
We report on a new synthetic method for mesoporous titania/silica (MTS), which is framed by titania-coated silica nanospheres. The MTS has extremely high thermal stability (stable up to 1000 °C), a high surface area (690−480 m 2 /g), a high pore volume (0.65−2.16 cm 3 /g), and a narrow pore size distribution. The anat…
Layered thin films composed of avidin and 2-iminobiotin-labeled poly(ethyleneimine) (ib-PEI) were prepared by a layer-by-layer deposition of avidin and ib-PEI on a solid surface, and the disintegration induced by changing environmental pH and adding biotin in the solution was studied. The avidin/ib-PEI layered film co…
Diarylethene derivatives having imino nitroxide and nitronyl nitroxide have been prepared to examine the effect of the radical substituents on the photochromic reactivity of 1,2-bis(2-methyl-1-benzothiophen-3-yl)perfluorocyclopentene. These radical substituents reduce the quantum yields of both cyclization and cyclore…
A photoinduced transition in an azobenzene-containing liquid crystal leads to a phase that does not exist in the thermal cycle. The smectic A phase is induced and stabilized only in the presence of UV light, producing fan-shaped focal conic textures typical of the SmA phase, as observed by polarized-light microscopy (…
Abstract A series of water‐based polyurethane dispersions were synthesized by the polyaddition of isophorone diisocyanate, poly(oxytetramethylene) glycol, and dimethylol propionic acid as prepolymers, which were end‐capped and crosslinked with 3‐aminopropyl trimethoxysilane (APTMS) to produce silylated polyurethane di…
CuO powders with a high specific surface area are shown to be able to produce H(2)O(2) in aqueous solution under simulated light irradiation. The highest rate of peroxide production was observed under mild experimental conditions using O(2) and a large surface area photocatalyst CuO irradiated with a solar simulator h…
Abstract Samples of polyurethane nanocomposites were synthesized using diphenylmethane diisocyanate, poly(ε‐caprolactone) diol, di(ethylene glycol), and a clay functionalized by hydroxyl groups. The inorganic content in the hybrids was 2 wt %, 4 wt %, and 8 wt %. The X‐ray analysis showed that exfoliation occurred for…
A multistate chiroptical macromolecular switch based on the redox behavior of tetrathiafulvalene (TTF) units has been prepared from a chiral TTF functionalized with an isocyanide group. Polymerization takes place diastereoselectively due to an unusually long-range chiral induction, yielding a helical backbone with org…
Abstract As‐received and washed jute fabrics were used as reinforcement for a thermoset resin. The mild treatments performed on the jute fabrics did not significantly affect their physical and thermal behaviors. The washed fibers absorbed less water than the unmodified (as received) ones, indicating that the coating u…
Recent work has shown that atom motion in liquids is not completely homogeneous, but that stringlike cooperative motion can be used to explain several properties of liquids. We now show that with increasing concentration the properties of interstitial atoms in crystalline materials smoothly approach and eventually com…
We demonstrate a method for embossing titania sol--gel precursor with poly(methyl methacrylate) (PMMA) molds to make thin films of titania that have dense arrays of 35--65 nm diameter pores, whose features are 1 order of magnitude smaller than those previously demonstrated for sol--gel molding. We show that the high m…
Two cyano-bridged tetranuclear complexes composed of Mn(III) salen (salen = N,N'-ethylene bis(salicylideneiminate)) and hexacyanometalate(III) (M = Fe, Cr) in a stoichiometry of 3:1 have been selectively synthesized using {NH2(n-C12H25)2}3[M(III)(CN)6] (M(III) = Fe, Cr) starting materials: [{Mn(salen)(EtOH)}3{M(CN)6}]…
A series of TPU nanocomposites were prepared by incorporating organically modified layered silicates with controlled particle size. To our knowledge, this is the first study into the effects of layered silicate diameter in polymer nanocomposites utilizing the same mineral for each size fraction. The tensile properties…
One-dimensional pure cubic Y(2)O(3)/Eu(3+) nanocrystals (NCs) were synthesized by a hydrothermal method at various temperatures. The NCs prepared at 130 degrees C yielded nanotubes (NTs) with wall thickness of 5-10 nm and outer diameter of 20-40 nm. The NCs prepared at 170 and 180 degrees C yielded nanowires (NWs) wit…
Luminescent Mn-doped II-VI semiconductor nanocrystals have been intensively investigated over the last ten years. Several semiconductor host materials such as ZnS, CdS, and ZnSe have been used for Mn-doped nanocrystals with different synthetic routes and surface passivation. Beyond studies of their fundamental propert…
Abstract The effect of different concentrations of single‐walled carbon nanotubes (SWNTs) on the nonisothermal crystallization kinetics, morphology, and mechanical properties of polypropylene (PP) matrix composites obtained by melt compounding was investigated by means of X‐ray diffraction, differential scanning calor…