Materials Literature
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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…
Abnormal salt content dependence of conductivity is observed in solid electrolytes exclusively composed of small molecules of 3-hydroxypropionitrile (HPN) and lithium iodide (LiI) induced by reinforced hydrogen bonding and formation of ionic clusters at high salt content.
Powdered [Cu(L2NH2)2][ClO4]2 (1; L2NH2 = 2,6-bis{hydrazonomethyl}pyridine) and [Cu(L2OH)2][ClO4]2 (2; L2OH = 2,6-bis{oximomethyl}pyridine) exhibit EPR spectra that are consistent with {dz2}1 Cu(II) centres at 295 K. These slowly transform upon cooling to 5 K, to show g-values that more closely resemble {dy2−z2}1, pseu…
The nature of intrinsic emission bands of yttrium orthoaluminate in the UV spectral region at max=220 nm (5.63 eV) and 330 nm (4.13 eV) is studied on the basis of the luminescence of single crystals and single-crystal films of YAlO3 and Ce: YAlO3 excited by synchrotron radiation sources with an energy of 3–25 eV at 9…
Abstract A novel water swellable rubber (WSR) was prepared by blending chlorohydrin rubber (CHR) with crosslinked polyacrylate (CPA), poly(vinyl alcohol)‐g‐poly(butyl acrylate) (PVA‐g‐PBA), precipitated silica (PSA), and poly(ethylene glycol) (PEG). The amphiphilic graft copolymer PVA‐g‐PBA was incorporated as the com…
In previous study, the extremely high reaction rate obtained by the mechanical milling has been reported. It was found that the phenomena were quite complicated and the many factors were affected on the reactivity. Among these factors, the crystal state of hematite and atmosphere (air and argon) during the milling wer…