Materials Literature
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Shape memory polymers (SMPs) have a number of advantages as compared with their metal counterpart, namely shape memory alloys (SMAs), in particular for some particular medical applications. The recent finding of the influence of moisture on the glass transition temperature of polyurethane SMPs, which are typically the…
Recent research [Mills et al. Chemosphere 2006, 64, 1032−1035; Lee and Choi J. Phys. Chem. B 2002, 106, 11818−11822] has demonstrated photocatalytic oxidation of “soot” by titanium dioxide thin films. However, little attention has been paid to developing kinetic models of photocatalyzed soot destruction. We develop he…
Thermally enhanced photoinduced reorientation in a photo-cross-linkable liquid crystalline polymethacrylate comprised of 4-(ω-cinnamoyloxyalkyloxy)biphenyl side groups is investigated by irradiating with linearly polarized ultraviolet (LPUV) light and subsequent annealing at elevated temperatures. An odd−even effect o…
The viscosity and self-diffusion constant of a mesoscale hydrodynamic method, dissipative particle dynamics (DPD), are investigated. The viscosity of DPD with finite time step, including the Lowe-Anderson thermostat, is derived analytically for the ideal-gas equation of state and phenomenologically for systems with so…
The reactions of the nitrogen Lewis bases (B) 1-methylimidazole (1-MeIm), pyridine (Py), and NH3 as gases with sublimed layers containing the 5-coordinate nitrito iron(III)-porphyrinato complexes Fe(Por)(eta1-ONO) (1) are described (Por = meso-tetraphenyl-porphyrinato or meso-tetra-p-tolyl-porphyrinato dianions). In s…
Abstract In this paper, the mechanical response and deformation behavior of anodic aluminum oxide (AAO) were investigated using experimental nanoindentation and Vickers hardness tests. The results showed the contact angle for the nanoporous AAO specimen was 105° and the specimen exhibited hydrophobic behavior. The har…
In the course of our studies on the isolation of bioactive compounds from the roots of Coleus forskohlii, a traditional herb in India, rare 13-epi-sclareol has been isolated, and its structure determined by extensive 2D NMR. This is the first report of isolation from this plant. The isolated compound showed antiprolif…
We have presented here results of a low temperature transport study of polypyrrole nanowires having low electron densities, which shows characteristics of charge density waves observed in structurally ordered materials. The current-voltage characteristics of all these nanowires show a power-law dependence on voltage a…
High-density, ultralong SiO 2 nanotubes were successfully synthesized by a one-step thermal evaporation process using CdSe nanocrystals as the seeds. The as-synthesized products were characterized using X-ray diffraction, scanning electron microscopy, transmission electron microscopy, energy-dispersive X-ray spectrome…
Smooth (Ra approximately 0.1 nm) and rough (Ra approximately 20 nm) coatings of 1H,1H,2H,2H-perfluorodecyltrimethoxysilane (FAS-17) were prepared by controlling process conditions. The water contact angles for the smooth and rough coatings were similar (107 degrees and 110 degrees, respectively), but their sliding ang…
Abstract An electroactive triblock copolymer of poly(ethylene glycol) (PEG) and aniline pentamer (AP), PEG‐ block ‐AP‐ block ‐PEG (PAP), was synthesized via polycondensation in the presence of N , N' ‐dicyclohexylcarbodiimide (DCC). The UV‐vis spectra and cyclic‐voltammograms (CV) spectra exhibited an excellent electr…
Abstract Water‐soluble single‐ and multi‐walled carbon nanotubes (CNTs) were prepared by grafting polyacrylamide chains from the graphitic surface via ceric ion‐induced redox radical polymerization. The reducing functionalities were covalently attached to the tubes by peroxide‐assisted radical reaction. The results sh…
A new family of silsesquioxane-based nanoparticles was synthesized by hydrolytic condensation of a triethoxysilane precursor, R-Si(OCH2CH3)3, R = -CH2CH2CH2N(CH2CH2COOCH2CH2OH)2, derived from 2-hydroxyethyl acrylate. Condensation of the triethoxysilane precursor proceeded as a homogeneous system in methanol in the pre…
We report on the (sub)picosecond relaxation processes in PbSe quantum dots of different sizes, measured by a near-infrared photoluminescence upconversion technique. The early-time spectra are characterized by emission from several low-lying excited states. The direct measurement of the Huang-Rhys factors of the lowest…
A novel honeycomb liquid-crystalline (LC) phase with triangular cells is found for a new compound composed of three incompatible molecular parts, namely, a rigid terphenyl core, two different nonpolar alkyl chains in the terminal 4- and 4‘ ‘-positions, and a polar flexible oligo(oxyethylene)chain terminated by a COOH…
Ag films were grown by pulsed laser deposition on insulating $\mathrm{Si}{\mathrm{O}}_{2}$ and mica substrates and exhibited a morphological progression beginning with nucleation of three-dimensional islands and culminating in a continuous, electrically conducting film. The rate of advancement through this progression…
In this work we present the results on formation of ZnO nanorods prepared by spray of aqueous solutions containing ZnCl2and thiocarbamide (tu) at different molar ratios. It has been observed that addition of thiocarbamide into the spray solution has great impact on the size, shape and phase composition of the ZnO crys…
Abstract Poly(ethylene terephthalate) (PET) based nanocomposites containing 3 wt % of different nanoparticles (MontMorilloniTe–MMT; titanium dioxide–TiO 2 ; and silica dioxide–SiO 2 ) were prepared via two independent procedures: mechanical mixing with subsequent direct injection molding (DIM) and mechanical mixing, f…
Noble metals supported on metal oxide surfaces have broad applications in catalysis, microelectronics and sensing. In most applications it is critical to control the dispersion and morphology of the noble metals to achieve either a smooth, continuous film or isolated particles of controlled size. Here we examine the a…
The dimension- and size-dependent ground-state properties of ZnO systems are investigated through first-principles density-functional theory calculations. It is found that the effective elastic constants ${C}_{33}$ of polar surface terminated ZnO nanofilms and [0001] oriented ZnO nanowires increase with structural siz…