Materials Literature
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The objective of this study is to compare the reactivity of two polymorphs of flufenamic acid with ammonia and relate it to crystal packing. Forms I and III of flufenamic acid were exposed to dry ammonia vapor. Optical microscopy, microscopic Raman, and XRPD were used to characterize the possible changes. The differen…
A reverse approach to designing as-built transformers is presented in this paper. The physical characteristics and dimensions of the windings and core are the specifications. By manipulating the amount and type of material actually to be used in the construction of the transformer, its performance can be determined. S…
Differently from magnetoelectric (ME) crystal families (e.g., Cr 2 O 3 and phosphates) to which the ME effect is intrinsic, multiferroic composites such as ferrite/piezoelectric ceramic composites exhibit extrinsic ME effect which is known as a "product property" resulted from the interaction between the ferrite and p…
We present an effective Ginzburg-Landau theory for ferromagnetic cubic Ni-Mn-Ga in which structural and magnetic phase transitions take place. The general problem of a cubic ferromagnet is taken into account by fitting the parameters of the Ginzburg-Landau functional to experimental data. This enables us to obtain a r…
The reaction of boron with products of the thermal decomposition of hydrazine and the crystallization of boron nitride from BN solutions in supercritical N–H fluid have been studies in situ at pressures up to 5.2 GPa and temperatures up to 1600 K using angle- and energy-dispersive X-ray diffraction with synchrotron ra…
Our recent research interest has focussed on rare earth phenanthroline complexes, which are obviously of significant value for modern coordination chemistry. As a continuing part of a systematic investigation of ternary rare earth phenanthroline nitrato complexes [Y.Q. Zheng, L.-X. Zhou, J.L. Lin and S.-W. Zhang (2000…
Multi-wall carbon nanotubes (MWNTs) have been grown from simple pyrolysis of camphor, a botanical hydrocarbon, at 900°C for 15 min in argon atmosphere at ambient pressure using ferrocene as a catalyst. The nanotube diameter is fairly uniform (20-40 nm) and the yield is extremely high (∼90%). Structural characterizatio…
The purpose of the project was to develop an x-ray photoelectron spectroscopic technique to quantify film-tablet interfacial thickness. Tablets containing 99% dibasic calcium phosphate were coated with an acrylic polymer containing chlorine (Eudragit RL 30 D). The film-tablet interface was defined as the region where…
The hydrogen-bonded complex of 4-hexyloxybenzoic acid and 4,4'-bipyridine (HOBA-BPy) was selected as an example to study the dynamic behavior of the hydrogen-bonded mesogens in liquid crystalline state by using temperature-variable FTIR (TV-FTIR). We found that there exist two dynamic equilibria of hydrogen bonding di…
In a nonionic inverse microemulsion system, surfactant (C12-18EO9)/cyclohexane/water, heteropolyanions [PMo12O40]3- react with K+ to form K3[PMo12O40].nH2O nanorods and assemble as three-dimensional starlike nanostructures.
Zirconium alloys containing about 0.5% tin, which are classified as dilute tin alloys, possess excellent uniform waterside corrosion resistance necessary for the PWR fuel applications. Mechanical and irradiation growth properties of the dilute alloys can be adjusted for specific component application by controlling th…
It has been observed that hydrogen either in solid solution or precipitated under the form of hydrides has an impact on the viscoplasticity of CWSR Zircaloy-4 cladding tubes, increasing significantly the creep resistance. The use of TEM on the structurally complex CWSR material being unlikely to identify the deformati…
Metals are the most thoroughly studied group among the many diverse substances that are the subject matter of Materials Science. They therefore make good paradigms, and furnish invaluable benchmarks, for guiding scientists in deciding how other materials should best be studied in order to reveal most clearly the inter…
The new frontier of oil and gas exploration will be with deep wells, particularly in deepwater. Most of the “easy-to-pick” fruit have been taken with shallow field development. Compared to shallow wells, deep wells generally require more high-performance, nickel-base alloys. Wells are categorized as being either “swee…
The enzymatic mode of action in paper fibre upgrading is still uncertain. In an attempt to clarify how enzymes modify pulp and paper properties, several parameters were analysed in the present work: (i) thermal analysis of the water-solid surface interactions; (ii) fibre cake permeability; (iii) particle size analysis…
In order to be able to simulate long time and large space scale properties of polymer melts one has to resort to coarse grained models, for example by subdividing all polymers into parts and restricting attention to the center of mass positions and velocities of these parts. The dynamics of these variables is governed…
Microstructure evolution during the rapid solidification of Fe-C and Fe-C-P alloys is simulated using the phase-field model for alloys with thin interface limit parameters. Heat transfer equation is solved simultaneously to study the heat flow and the effect of latent heat generation on the microstructure. The calcula…
The barrier effect for copper diffusion and the adhesion properties of copper seed layers were studied for sputtered TaSiN layers. The diffusion depth of copper following 400°C annealing is as deep as 25 nm using conventional tantalum nitride (TaN) barrier layers. With the doping of Si in this layer to form TaSiN, the…
Tensile properties of vascular smooth muscle cells (VSMCs) of synthetic and contractile phenotypes were determined using a newly developed tensile test system. Synthetic and contractile VSMCs were isolated from the rabbit thoracic aorta with an explant and an enzymatic digestion method, respectively. Each cell floated…
The effect of tautomerism on the aromaticity was studied for the free base triazoleporphyrazine at the Density Functional Theory level, using double-zeta double polarized basis sets. The porphyrazine (1), the three tautomers (2a, 2b and 2c) as well as the Ni complex (3) of triazoleporphyrazine were examined. Two indep…