Materials Literature
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The selective oxidation of sulfides with hydrogen peroxide to give sulfoxides was carried out in aqueous solution by water-soluble manganese porphyrin as mimics of cytochrome P450-like catalyst. Different factors that influencing the selective oxidation of sulfides, for example, catalyst, amount of catalyst, solvent a…
Space group symmetry is exploited and implemented in density functional calculations of extended systems with periodic boundary conditions. Our scheme for reducing the number of two-electron integrals employs the entire set of operations of the space group, including glide plains and screw axes. Speedups observed for…
An urgent demand remains in astronomy for high-reflectivity silver mirrors that can withstand years of exposure in observatory environments. The University of California Observatories Astronomical Coatings Lab has undertaken development of protected silver coatings suitable for telescope mirrors that maintain high ref…
Motivated by possible applications in optoelectronics, we consider nonlinear optical rectification (NOR) in two planar hexagonal lattice structures with broken space inversion symmetry—namely, in graphene epitaxially grown on a SiC substrate and in boronitrene (a monolayer of BN). For both structures, we calculate the…
RTI has demonstrated a novel photodiode technology based on IR-absorbing solution-processed PbS colloidal quantum dots (CQD) that can overcome the high cost, limited spectral response, and challenges in the reduction in pixel size associated with InGaAs focal plane arrays. The most significant advantage of the CQD tec…
Polypyrrole (PPy) nanocomposites with iron nanoparticles attached to 2‐acrylamido‐2‐methyl‐1‐propanesulfonic acid (AMP) were chemically prepared by varying the concentration of AMP using ammonium persulfate as an oxidant. The synthesized composites were characterized by using Fourier transform infrared (FTIR) spectros…
Frequency- and temperature-dependent dielectric and switching parameters of a room temperature tri-component antiferroelectric liquid crystal mixture W-287 have been determined. Dielectric, optical texture and thermodynamic studies show wide room temperature range antiferroelectric SmC*a (˜91.1°C to <–25°C) phase in a…
We propose an experimental approach to extract separately the surface and interface phase shift of standing waves in metallic quantum well (QW) structures composed of isostructural perovskite oxides. The ``asymmetric'' vacuum/SrVO${}_{3}$/SrTiO${}_{3}$ and ``symmetric'' SrTiO${}_{3}$/SrVO${}_{3}$/SrTiO${}_{3}$ QW stru…
The surface‐enhanced Raman scattering substrate of Ag–Ag nanocap arrays are prepared by depositing Ag film onto two‐dimensional (2D) polystyrene colloidal nanosphere templates. When the original colloidal arrays are used as the substrate for Ag deposition, surface‐enhanced Raman scattering (SERS) enhancements show the…
Hydrogels are widely used as scaffolds in tissue engineering because they can provide excellent environments for bioactive components including growth factors and cells. We reported in this study on a physical hydrogel formed by a specific protein-peptide interaction, which could be used for the three dimensional (3D)…
Proceedings of the National Academy of Sciences (PNAS), a peer reviewed journal of the National Academy of Sciences (NAS) - an authoritative source of high-impact, original research that broadly spans the biological, physical, and social sciences.
Abstract Biomolecule adsorption is the first stage of biofouling. The aim of this work was to reduce the adsorption of proteins on stainless steel (SS) and titanium surfaces by modifying them with a poly(ethylene oxide) (PEO)-poly(propylene oxide) (PPO)-PEO triblock copolymer. Anchoring of the central PPO block of the…
A reactive extrusion process is developed for the modification of the rheological properties of a high density polyethylene (HDPE) by inducing long chain branching (LCB) using a photoinitiator and ultraviolet (UV) light. A central composite response surface design is selected to design the experimental runs at differe…
Ion dynamics in lithium bismuth borate conducting glasses have been reported in wide composition and temperature ranges. The activation energy for the dc conduction has been analysed using Anderson-Stuart model and a correlation between the dc conductivity and the doorway radius has been predicted. The characteristic…
The purpose of this research is to develop and evaluate Pluronic P123 (P123)-docetaxel (DTX) conjugate that could form core-shell-type micelles in aqueous solution. DTX was covalently conjugated to P123 via ester bond after the activation of DTX by succinic anhydride. The structure of P123-DTX conjugate was confirmed…
Amorphous nanostructure silicon carbide (a-SiC) recently received great attention for its use as protective coating for metallic substrates due to its good mechanical properties and corrosion resistance. In this article, a-SiC thin films were deposited on AISI 304 stainless steel substrates at room temperature for dep…
Spectroscopic ellipsometry and atomic force microscope techniques were employed to analyze optical properties, microstructure and thickness of cobalt oxide thin films deposited on metal substrates by the sol-gel dipping method. The ellipsometric data were conveniently fitted, assuming a stratified structure for the de…
Abstract The reaction of Co(NO 3 ) 2 · 6H 2 O with N , N ‐diethanolamine (H 2 L1 ) in the presence of sodium acetate, using triethylamine as a base, leads to a tridecanuclear mixed‐valent cobalt cluster [Co II 9 Co III 4 (OH) 6 (H 2 O) 2 ( L1 ) 8 (OAc) 4 ](NO 3 ) 4 · 24H 2 O ( 1 ). Similar reaction with a newly design…
A comprehensive study of GeTe-based materials where Ge is replaced by 2 at.% Ag, 2 at.% Sb, and additionally by 1 or 2 at.% Dy (Ag2Sb2Ge46 − xDyxTe50 alloys) has been conducted using Seebeck coefficient, electrical resistivity, and thermal conductivity measurements in the temperature range of 300–750 K, and X-ray diff…
Stockmayer fluids are a prototype model system for dipolar fluids. We have computed the freezing temperatures of Stockmayer fluids at zero pressure using three different molecular-dynamics simulation methods, namely, the superheating-undercooling method, the constant-pressure and constant-temperature two-phase coexist…