Materials Literature
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We discuss the influence of photoinduced effects (PIEs) on the measurements of nonlinear refractive indices and nonlinear absorption coefficients. A chalcogenide glass film Te20As30Se50 was studied using picosecond laser pulses at 1064 nm. The nonlinear imaging technique with phase object (NIT-PO) and the Z-scan techn…
We present the structure and energetics of surface reduction and NO2 adsorption on the reduced (1 1 1), (1 1 0) and (1 0 0) surfaces of ceria using density functional theory with the generalized gradient approximations (GGA) corrected for on-site Coulomb interactions, GGA+U. Vacancy formation at the surfaces of the ce…
Polycrystalline Bi1∕2Sr1∕2FeO3 was synthesized by solid state reaction method. Powder x-ray diffraction pattern of the sample was fitted using a noncentrosymmetric rhombohedral crystal system of space group R3c. The sample was found to be free from any secondary phases. This single phase material exhibits simultaneous…
The photoluminescence enhancement effect of Li-, Zn-, or Al-doped GdTaO4:Eu3+ is investigated at 20 and 295 K. The underlying reason of luminescence enhancement by ion doping is revealed, and a mechanism of the enhancement based on the temperature effect is proposed. It can be safely concluded that the photoluminescen…
Abstract In this study, we describe a new strategy for producing narrowly dispersed functional colloidal particles stabilized by a nanocomposite with hydrophilic clay faces and hydrophobic polystyrene (PS) brushes on the edges. This method involves preparation of polymer brushes on the edges of clay layers and Pickeri…
Experimental solubilities of four antiepileptic drugs, that is, lamotrigine, diazepam, clonazepam, and phenobarbital in propylene glycol + water mixtures at 298.15 K were reported. The solubility of drugs was increased with the addition of propylene glycol, and the maximum values are observed in neat propylene glycol.…
Poly(methacrylic acid) (PMAA) films were photografted by iniferter-mediated polymerization from self-assembled monolayers (SAMs) of initiator molecules immobilized on Au via disulfide linkages and mixed with disulfide alkanes. The influence of initiator coverage on the growth rates of film thickness, surface morpholog…
Si-based photodetectors for narrow-band ultraviolet light (319 nm) and green light (500 nm) detection are demonstrated using a metal-oxide-semiconductor tunneling structure. By using appropriate selection of gate metal, the metal-oxide-semiconductor tunneling diode can detect specific range of light. Due to the spectr…
Abstract We investigate photoinduced fluorescence enhancement (PFE) and energy transfer effects of surfactant capped Cd/Se core and CdSe/ZnS core/shell quantum dots (QD) that emit at 630‐650 nm adsorbed in and onto porous silicon (PSi) single layer films and microcavity devices. Evidence is presented for fluorescence…
PURPOSE: Aim of this study is to investigate the mechanism of self-emulsification through rheological analysis of intermediate liquid crystalline (LC) phase formed during self-emulsification process. METHODS: Binary system of tween 80 (T80) and imwitor 742 (I742) was used and different SES were prepared with I742 at 1…
The nucleation process of CdSe nanocrystals is studied by fluorescence-detected extended x-ray absorption fine structure (EXAFS) using a microreactor and synchrotron radiation. Detailed analysis of in situ Se K-edge EXAFS data measured along a microreactor channel revealed a strong position-dependence which displays a…
Abstract Aiming at the improvement of mechanical and dielectric properties of poly(vinyl alcohol) (PVA), we prepared composites of PVA and magnesium nitrate hexahydrate. It was found that the composites were very soft and rubber‐like, and the glass transition temperature decreased with increasing the salt concentratio…
IR-transparent beta-GeS(2) crystallized glasses were fabricated by crystallization of the glass with a stoichiometric composition corresponding to target crystal and only beta-GeS(2) crystallites were precipitated. A clear second-harmonic generation was observed in the crystallized glasses by the Maker fringe techniqu…
First principles and tight binding Monte Carlo simulations show that junctions between single-walled carbon nanotubes (SWNTs) and nickel clusters are on the cluster surface, and not at subsurface sites, irrespective of the nanotube chirality, temperature, and whether the docking is gentle or forced. Gentle docking hel…
Vertically aligned ZnO nanotube fabricated on an indium tin oxide substrate is found to exhibit strong persistent photoconductivity (PPC). Excitation wavelength-dependent conductance measurement on individual ZnO nanotube reveals the presence of defect states at 240 meV above the valence band edge, which are directly…
Abstract Polylactide (PLA)/silica composite films were prepared by two methods: blending nanoscale colloidal silica sol and sol–gel. The nano and microscale silica particles, respectively, were well dispersed in PLA when observed using scanning electron microscopy and transmission electron microscope. The mechanical a…
Porous ceramic materials have been thoroughly developed due to the wide number of applications in different areas, such as filters for environmental clean-up and reuse, bioreactors, gas or chemical sensors and support materials for catalysts or absorbents. One of the forming methods that can be selected for these appl…
Abstract Poly(vinyl alcohol) (PVOH) was obtained from the alkaline hydrolysis of poly(vinyl acetate) (PVAc). Nonwoven membranes (mats) of PVOH nanofibers were produced by electrospinning of solutions of PVOH in water with and without aluminum chloride. The concentration of the PVOH/water solution was 12.4% w/v. The mo…
The coordinate transformation method is applied to bounded domains to design metamaterial devices for steering spatially confined electromagnetic fields. Both waveguide and free-space beam applications are considered as these are analogous within the present approach. In particular, we describe devices that bend the p…
We proposed and demonstrated architectural tuning of color chromaticity by controlling photoluminescence decay kinetics through nonradiative Förster resonance energy transfer in the heterostructure of layer-by-layer spaced CdTe nanocrystal (NC) solids. We achieved highly sensitive tuning by precisely adjusting the ene…