Materials Literature
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Abstract A big challenge in making a composite lies in achieving individual‐nanotube dispersion of carbon nanotubes (CNTs) in a polymer matrix, without aggregation and entanglement and excellent interfacial adhesion between the CNTs and the polymers matrix. In this communication, using polyethylene glycol‐200, we succ…
Magnetic latexes were prepared by the encapsulation of organically capped CoPt 3 nanoparticles via miniemulsion in situ radical polymerization of tert -butyl acrylate ( t BA). This is the first example of a CoPt 3 based polymer nanocomposite showing ferromagnetic behaviour at room temperature. Each nanocomposite parti…
Abstract Two CF 3 ‐terminated polymers were synthesized by polymer analogous reactions in order to study the effect of the terminal CF 3 groups on their surface properties. ESCA and NEXAFS showed that they contain highly ordered side chains oriented perpendicularly to the polymer surface. The CF 3 ‐terminated polymers…
Paradoxically more than 50 years after being used in WWII, polycrystalline PbSe technology has turned today into an emerging technology. Without any doubt one of the main facts responsible for the PbSe resurgence is a new method for processing detectors based on a Vapour Phase Deposition (VPD) technique developed at C…
The materials community realized that zinc sulfide (ZnS) was an important optical material for infrared windows over forty years ago. Chemical vapor deposition (CVD) quickly became the method of choice for producing large ZnS windows and domes. In addition to the development initiated in the United States, several int…
The relaxivity behaviour and the structural characterization of new supramolecular aggregates (bilayer structures and micelles) obtained by combining two different amphiphilic monomers are reported. One monomer, (C18)(2)DTPAGlu-Gd, contains a very stable gadolinium complex, and the other, DSPE-PEG(2000)-CCK8, contains…
This paper presents experimental results on the effect of molecular weight on the surface tension of polystyrene melt in supercritical nitrogen. The surface tension was determined by the axisymmetric drop shape analysis-profile (ADSA-P) method, for which a high-pressure and high-temperature cell was used to form penda…
We perform an ab initio study of the electric field gradient (EFG) at the nucleus of Cd impurities at substitutional Sn sites in crystalline SnO. The full-potential linearized-augmented plane wave and the projector augmented wave methods used here allow us to treat the electronic structure of the doped system and the…
Cholesteric liquid crystal (CLC) cells were fabricated using three kinds of nematic liquid crystal (NLC) materials with different optical birefringent anisotropies Δ n . A larger Δ n of NLCs results in a larger photonic band gap (PBG) width and higher density of states (DOS) at the PBG edge for each CLC cell. We were…
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…