Materials Literature
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The development of second-generation photosensitizers to improve photodynamic therapy (PDT) is an area of extensive research. Three such compounds that have been synthesized in our group are polysubstituted Zn(II) phthalocyanines that differ in their overall net charge (one cationic, one anionic and one neutral). The…
An investigation of the primary Bjerknes force acting on a bubble in a strong acoustic field is presented. The approach takes into account the nonlinear resonancelike response of small bubbles to strong acoustic pressure amplitudes. It is shown that for high pressure amplitudes even very small bubbles are repelled fro…
The monoclinic‐to‐tetragonal phase transformation in LaNbO 4 has been investigated by X‐ray diffraction and dilatometry. Based on the experimental results and theoretical concerns (Landau theory and thermodynamics), it is suggested that this transformation is second order in nature.
This article tries to provide some direct evidence about the relationship between the intramolecular hydrogen bonds in cellulose and their corresponding effect on physical properties. The formation of intramolecular hydrogen bonds has been proved to contribute directly to certain physical properties of cellulose, such…
Simple expressions are given for the Newtonian viscosity ${\mathrm{\ensuremath{\eta}}}_{\mathrm{N}}$(\ensuremath{\varphi}) as well as the viscoelastic behavior of the viscosity \ensuremath{\eta}(\ensuremath{\varphi},\ensuremath{\omega}) of neutral monodisperse hard-sphere colloidal suspensions as a function of volume…
The synthesis of amphiphilic AB block copolymers, having 1,4-polydiene or corresponding hydrogenated aliphatic polyolefin blocks and poly(ethylene oxide) (PEO) blocks, is described. The materials are obtained in a two-step process. In the first step isoprene is polymerized anionically in a hydrocarbon solvent with sec…
A photoisomerizable nitrospiropyran monolayer assembled on a Au electrode provides a functionalized interface for the photochemical, pH, and thermal control of electrochemical processes of charged electroactive redox probes. (Mercaptobutyl)nitrospiropyran 1 was assembled as a monolayer on a Au electrode. The monolayer…
This review focuses on the use of heterogeneous catalysts in the production of fine and speciality chemicals. The major emphasis is on those systems which have been commercialised already and those which are close to commercialisation. These include the use of TS-1 for oxidation reactions including the production of h…
Several edible films based on methylcellulose and polyethylene glycol 400 (PEG400) were prepared and stored until equilibration at different relative humidities. Tensile stress−strain curves show very different behaviors as a function of PEG400 and relative humidity. Tensile strength strongly depends on relative humid…
The present analysis provides Tb(0.27−0.30)Dy(0.73−0.70)Fe(1.9−2.0) magnetization and magnetostriction states during applied magnetic field and stress processes by minimizing the total magnetic free energy in the presence of a parameter selected inverse exponential magnetic free energy distribution. A comparison betwe…
The entropic depletion force, in colloids, arises when large particles are placed in a solution of smaller ones, and sterically constrained to avoid them. In this paper, we consider a system of two parallel plates suspended in a semidilute solution of long thin rods of length L and diameter D. By numerically solving a…
Zinc oxide-silicon heterojunctions were fabricated using both n- and p-type silicon. The zinc oxide films were deposited by the magnetron sputtering process at various substrate temperatures to form these devices. The electrical properties of these devices were measured and the work function of the zinc oxide was eval…
A highly pure mixture of carbon and silica was obtained on pyrolysis rice husk leached with acid at high temperature in a nonoxidizing atmosphere. The product was suitable for use as a starting material in the the manufacture of silicon nitride powder. The effect of treatment including the kind and concentration of ac…
PROBLEM: Heart valve replacement with either a nonliving xenograft or a mechanical prosthesis is an effective therapy for valvular heart disease. Both of these approaches have limitations, including their inability to grow, repair, and remodel. In addition, a mechanical prosthesis requires long-term anticoagulation th…
The entropically based nonlinear Adam-Gibbs equation is discussed in the context of phenomenologies for nonlinear enthalpy relaxation within the glass transition temperature range. In many materials for which adequate data are available, the nonlinear Adam-Gibbs parameters are physically reasonable and agree with thos…
The phase stability of the subsolidus region in the composition regime SrO–SrTiO3 has been studied using a combination of atomistic computer simulation techniques and high-resolution electron microscopy (HREM). Both predictions from atomistic calculations and HREM observations suggest that at low concentrations (less…
A new nanofabrication procedure has been developed for making thermocouple probes for high-resolution scanning thermal microscopy. Thermocouple junctions were placed at the end of SiNx cantilever probe tips and were typically 100–500 nm in diameter. Cantilever bending due to thermal expansion mismatch was minimized fo…
An extensive photoelectron spectroscopic study on the CuO x - ( x = 0−6) species is presented. The photoelectron spectra of these species are obtained at four detachment photon energies: 2.33, 3.49, 4.66, and 6.42 eV. The spectra of the copper atom are included to show the dependence of the detachment cross sections o…
This paper presents a detailed study of boron nitride modifications at hydrostatic pressures. Cohesive properties of zinc blende (c-BN), wurtzite (w-BN), hexagonal (h-BN), rhombohedral (r-BN), and rocksalt structure are calculated by systematic optimization of unit cell parameters and atomic positions using total-ener…
Bulk, single crystal, and metal-organic chemical-vapor deposition thin-film samples of ${\mathrm{Gd}}_{0.67}$ ${\mathrm{Ca}}_{0.33}$ ${\mathrm{MnO}}_{3}$ were prepared and examined for their electrical, magnetic, and structural properties. ${\mathrm{Gd}}_{0.67}$ ${\mathrm{Ca}}_{0.33}$ ${\mathrm{MnO}}_{3}$ is ferrimagn…