Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Abstract We investigate the effect of oxygen molecule adsorption on the photoluminescence of porous silicon films of different porosity. The experimental results are explained by the photosensitization of singlet oxygen generation due to the energy transfer from excitons confined in Si nanocrystals to O 2 molecules ad…
This presentation is a survey of results of a long-term research at the laboratory of photoinduced processes at CREOL/UCF. A highly homogeneous and transparent sodium-zinc-aluminum-silicate glass doped with fluorine and bromine was developed. Glass is transparent from 220 to 2700 nm. It is a crown-type optical glass h…
A facile biomolecule-assisted approach has been developed to prepare porous network-like metastable γ-MnS nanostructures through hydrothermal treatment of a homogeneous system of MnCl2 and L-cysteine. The morphology and phase of the MnS products can be controlled by adjusting the reaction temperature and molar ratio o…
A model on the basis of transformation kinetics is developed in this paper in which magnetic-field-induced stress is introduced and the equivalence principle is employed for mechanical and magnetoelastic deformation. An exponential expression is given to describe the field dependence of magnetization for martensitic v…
Paper presented to the 3rd Annual Symposium on Graduate Research and Scholarly Projects (GRASP) held at the Hughes Metropolitan Complex, Wichita State University, April 27, 2007.
Abstract Thin film epitaxial silicon solar cells are considered a near future alternative to bulk silicon solar cells. However due to the limited thickness of the active layer they require efficient light trapping. Therefore we propose the development and implementation of such light confinement by means of a porous s…
Abstract In this paper, we discuss the acoustic properties of porous silicon and outline the differences and similarities of the behaviour of elastic and light waves in mesoporous porous silicon etched in p + ‐type silicon wafers. We then investigate the expected acoustic characteristics of distributed Bragg mirrors a…
Bifunctionalized hexagonal mesoporous silicas, CoPh-HMS, were designed and successfully synthesized by a one-step co-condensation route at ambient temperature. This new material possesses the typical wormhole structure of HMS material. Co 2+ ions were incorporated into the frameworks in tetrahedral coordination along…
Based on the modified Heisenberg model we analyse the influence of size and anisotropy effects on static and dynamic properties of ferromagnetic nanoparticles. A Green’s function technique in real space enables us to calculate the excitation energy and its damping as well as the magnetization depending on the temperat…
Abstract The parameters affecting the grafting reaction and side reactions in free‐radical melt grafting of maleic anhydride (MA) onto high‐density polyethylene with the aid of 2,5‐dimethyl‐2,5‐di( t ‐butyl peroxy)hexane peroxide(DTBPH) have been studied using an internal mixer. MA grafting degree of the maleated samp…
A 9,10-diarylanthracene derivative having two terminal trimethoxysilyl groups has been synthesized and used in combination with tetraethyl orthosilicate as a silicon source for the preparation of two periodic mesoporous silicas with MCM-41 and SBA-15 structures having about 15 wt % of the organic component. The result…
The thermal degradation of high-density polyethylene (HDPE) in decalin has been investigated as a method for the feedstock recycling of plastic wastes. The study is focused on the effects of the reaction time and temperature. The solvent increased the HDPE conversion and had a significant effect on the product distrib…
Silica-supported Co catalysts were prepared by using microemulsion. The structure and state of the Co species in the catalysts were characterized by TEM, XRD, Co K-edge XANES/EXAFS, and diffuse reflectance UV−vis spectroscopy. Co species in the catalysts prepared using microemulsion were atomically dispersed as Co 2+…
Organoclays were obtained by the cationic exchange of mono-, di-, and trialkyl chain surfactants (hexadecyltrimethylammonium bromide, dimethyldioctadecylammonium bromide, methyltrioctadecylammonium bromide) for sodium ions in an aqueous solution with Na−montmorillonite (Na−Mt). The characterization of organoclays with…
We have investigated the luminescence property of anodic alumina membranes (AAM) with ordered nanopore arrays prepared by electrochemically anodizing aluminium in oxalic acid, sulfuric acid and phosphoric acid solutions. The photoluminescence (PL) intensity of AAM prepared in C 2 H 2 O 4 is much higher than that of AA…
Using the usual melt-quenching technique, glasses with composition Ge14Se86−xTlx (x = 20%, 22%, 23.5%, 25%, 26.5% and 28%) have been obtained to prepare thin films with different thicknesses (d = 15, 30, 60, 90, 120 and 180 nm) using electron-beam evaporation. The optical gap Eg was found to decrease with increasing t…
Direct synthesis of H 2 O 2 from H 2 and O 2 is a reaction of commercial interest. In addition, this reaction is likely to occur in situ during gas-phase propylene epoxidation using H 2 and O 2 on Au/Ti-based catalysts. To consider the effect of alloying on H 2 O 2 formation on Au-containing clusters, we have performe…
Two dipyrromethane + dipyrromethanedicarbinol routes to a meso-substituted phlorin bearing electron-withdrawing pentafluorophenyl substituents (TpFPPhl) were investigated in an attempt to obtain a phlorin with enhanced stability toward light and air and to explore the application of dipyrromethanecarbinol chemistry to…
The ligand field molecular mechanics (LFMM) model has been applied to the oxidized Type 1 copper center. In conjunction with the AMBER94 force field implemented in DommiMOE, the ligand field extension of the molecular operating environment (MOE), LFMM parameters for Cu-N(imidazole), Cu-S(thiolate), Cu-S(thioether), an…
We have built a velocity imaging (VMI) spectrometer optimized for angle-resolved photoionization experiments with synchrotron radiation (SR) in the VUV and soft X-tay range. The spectrometer is equiped with four electrostatic lenses that focus the charged photoionization products onto a position-sensitive multi-hit de…