Materials Literature
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Thermophysical properties of liquid and supercooled nickel were measured using electrostatic levitation. Over the 1420-1850 K temperature range, the density can be expressed as ρ(T )=7.89×103−0.65(T −Tm) (kg · m-3) with melting temperature Tm=1728 K. The isobaric heat capacity was estimated as Cp(T )=36.2+1.9×10-3(T −…
Transient isotopic experiments reveal that the mechanism of N2O formation in the high-temperature NH3 oxidation over Pt-Rh gauze involves the reaction of adsorbed ammonia intermediate species (NHx) and NO.
Polypyrrole(PPy)nanotubes and nanowires were synthesized through electrochemical polymerization method in nanoporous anodisc aluminum oxide(Al2O3)template. The electrolyte consisted of pyrrole monomer, solvent, and ionic liquid dopant such as BMIMBF4(1-butyl-3-methyl imidazolium tetrafluoroborate)or BMIMPF6(1-butyl-3-…
Monazite(LaPO4)-coated alumina-fiber/alumina-matrix composites were fabricated by hot-pressing, and effects of sintering temperature, sintering time, applied load and fiber volume fraction on mechanical properties of composites were examined. Better fiber debonding of coated fiber than that of non-coated fiber in the…
Alkaline-earth substituted lanthanum manganites La1 − xAxMnO3 (A = Ca, Sr; x = 0, 0.4) were synthesized in air by self-propagating high-temperature synthesis (SHS): a combustion process involving the reaction of lanthanum(III) oxide, calcium oxide (or carbonate), strontium peroxide, manganese metal powder and sodium p…
Purification, chemistry and application are three very important aspects of current research on carbon nanotubes (CNTs). In the dissertation, the purification of nitric acid treated single-walled carbon nanotubes (SWNTs), the dissolution and dichlorocarbene addition of SWNTs, and the effects of chemically functionaliz…
This paper concentrates on CAD/CAM for a special yet useful type of 3D cellular woven structure. Mathematical algorithms have been developed for the creation of weave diagrams and lifting plans for the design and manufacture of this type of 3D woven structure. The algorithms are implemented in a newly created CAD/CAM…
Novel liquid crystal compounds having a difluoromethyleneoxy group as a linkage group have been prepared by the new synthetic method using dibromodifluoromethane in good yield. From the results of physical property measurements; i.e., transition temperature, dielectric anisotropy (Δ˜), birefringence (Δn) and viscosity…
The synthesis and the crystal structures of two platinum bis-ethynyl-phenyl-nitronyl-nitroxide complexes are reported and solution EPR investigations evidenced the intramolecular exchange interaction through a diamagnetic transition metal based spacer.
Reactions of [Tp*Rh(coe)(MeCN)](; Tp*= HB(3,5-dimethylpyrazol-1-yl)(3); coe = cyclooctene) with one equiv. of the organic disulfides, PhSSPh, TolSSTol (Tol = 4-MeC(6)H(4)), PySSPy (Py = 2-pyridyl), and tetraethylthiuram disulfide in THF at room temperature afforded the mononuclear Rh(III) complexes [Tp*Rh(SPh)(2)(MeCN…
Molecular dynamics simulations of thermal conduction in nanoporous thin films are performed. Thermal conductivity displays an inverse temperature dependence for films with small pores and a much less pronounced dependence for larger pores. Increasing porosity reduces thermal conductivity, while pore shape has little e…
Abstract In this paper we present a way of modeling crystallization in polymers within the confines of a new general framework that has been developed to describe materials undergoing dissipative processes. Crystallization in polymers is in general an irreversible process, and a characteristic of all such processes is…
Silica mesostructures with well-expressed hexagonal and wormhole framework structures and up to 50% organo-functionalization of the framework silicon sites have been directly assembled from sodium silicate.
The dielectric permittivity, conductivity and loss tangent of water were measured with non-blocking electrodes for different thicknesses of the sample and for various oscillator levels. The measurements were carried out in the 20-90°C temperature range with the 10°C interval. Domain Debye resonances in water, as well…
xi 1 MOTIVATION AND OBJECTIVES 1 1.1 Motivation 1 1.2 Problem Statement 4 1.3 Objectives 6 2 LITERATURE REVIEW FOR THERMAL CONDUCTIVITY 8 2.1 Electronic Structure of Nanotubes 8 2.2 Nanotubes Ropes 13 2.3 Nanotube Thermal Conductivity Temperature Dependence Simulations....... 14 2.4 Temperature Dependence and Chiralit…
A genetic algorithm has been used to generate crystal framework structures, including that of sodalite and chabazite, from the knowledge of only the unit cell dimensions, constituent elements and by defining exclusion zones–regions within the unit cell where the constituent elements are forbidden, as opposed to being…
The present paper presents the results of a thermoanalytical investigation on the kinetics of the aluminothermic reduction of Cr2O3 under non-isothermal conditions. Simultaneous differential thermal analysis (DTA) and thermogravimetry (TG) technique were used. It was determined the minimum molar ratio Cr2O3 : Al for t…
The main disadvantages of thermoplastic starch (TPS) are their retrogradation and unsatisfactory mechanical properties particularly under wet or dry environments.Formamide was used as an individual plasticizer to prepare thermoplastic starch (TPS) to overcome the facile retrogradation of polyols-plasticized TPS with g…
The determination of dislocation distribution parameters is discussed for specimens where both strain broadening caused by dislocations and size broadening occur. If the strain broadening is well described by a model due to Wilkens, several methods are possible for the analysis of the broadening of diffraction lines.…
Polyaniline (PANi) with grafted poly(styrenesulfonic acid) (PSSA) side chains from atom transfer radical polymerization (ATRP), and covalently immobilized on the hydrogen-terminated Si(100) surface (Si–H surface), was prepared via: (i) UV-induced coupling of 4-vinylaniline (VAn) on the Si–H surface (Si–VAn surface), (…