Materials Literature
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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), (…
We have devised a new technique for producing and studying giant pendant colloidosomes based on transferring particle-coated pendant water drops in oil through a planar oil–water interface.
Ga2(NMe2)6 is transformed into highly porous GaN based materials via ammonolysis in solution and subsequent pyrolysis at 673 K in an ammonia stream. The addition of long chain aliphatic amines (n-C6H13NH2-n-C12H25NH2) in solution allows the condensation reaction to be directed and results in microporous GaN based mate…
We have investigated the induction of ferroelectric SmC* liquid crystals using an atropisomeric biphenyl dopant (R)-1 in binary SmC host mixtures consisting of a 2-phenylpyrimidine host, either 2-PhP1 or 2-PhP2, and one of three structurally similar smectic components (co-hosts). The co-hosts include two 5-phenylpyrim…
We report the crystal structure and phase transitions of Mo2P4O15 which, despite a simple chemical formula, has 441 crystallographically unique atoms in its asymmetric unit and thus has the most complex structure of any extended oxide reported to date.
Polymer impregnation and pyrolysis (PIP) is one of the most attractive fabrication processes for silicon carbide (SiC) composites due to the shape flexibility, mass production and relatively low cost. In particular, advanced PIP SiC/SiC composite with high-crystallinity and near-stoichiometric composition is expected…
The present paper describes the grain size refinements of Mg alloys (AZ61, AZ91, ZK60) by HDDR treatment. As a result of the HDDR treatment at 350°C under a hydrogen pressure of 7 MPa for 24 h, following by evacuation at 350°C for 3 h, the grain size of AZ61 alloys was reduced from 10∼20 μm to 100∼200 nm. At the hydro…