Materials Literature
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We synthesized the block copolymer of poly(norbornene-dicarboxcylic acid) and poly(norbornene) at room temperature, using ring opening metathesis polymerization. We then templated the CoFe/sub 2/O/sub 4/ nanoparticles within the polymer matrix, utilizing the self-assembled nature of the block copolymer. We used transm…
Complex impedance analysis at cryogenic temperatures has revealed that the bulk and grain boundary properties of BaTiO 3 polycrystals are very sensitive to the oxygen partial pressure during sintering. Polycrystals sintered at P O2 as low as 10 −15 atm were already electrically heterogeneous. The activation energy of…
Abstract The degree of molecular alignment averaged over meso‐length scale areas within thermotropic liquid crystalline polymer (LCP) fibers has been intensely studied over recent years. In this work, the degree of molecular orientation is found from spatially‐resolved electron diffraction of areas as small as 100 nm…
A stress and temperature sensor based on changes in the higher order harmonics of a magnetically soft magnetoelastic sensor is reported. When excited by a low-frequency ac magnetic field, the nonlinear permeability of the ferromagnetic sensor causes the emission of higher order magnetic induction that can be detected…
Thin rhenium buffer layers deposited on c-sapphire surfaces were studied as potential substrates for the heteroepitaxial deposition of (111)-oriented diamond films. The Re layers were prepared by e-beam evaporation. They formed very flat epitaxial films with mosaicity values below 0.2°. Application of the bias enhance…
To determine the optimum drafting conditions of twin spun yam spinning, the drafting force must be investigated. In this work, we conduct a drafting force experiment based on Lyocell twin roving of to investigate the influence of the roller gauge, draft ratio, and roving spacing. The experimental results show that the…
We have investigated sensation responses to fabric frictional sounds according to fiber type, subject's nationality, age, gender, and acoustic sensitivity. Twenty-six American and thirty- two Korean adults participated in this study, and answered questions on seventeen adjectives describing sensations upon hearing the…
The evolution of nanoscale science and technology has dramatically expanded the classes of materials being explored and even implemented in device applications. This article summarizes advancements in making low dimensional structures from inorganic and organic compounds, determining the resulting, and necessarily loc…
Abstract The spreading of polymer nanodroplets upon a sudden change from partial to complete wetting on an ideally flat and structureless solid substrate has been studied by molecular dynamic simulations using a coarse‐grained bead‐spring model of flexible macromolecules. Tanner's law for the growth of the lateral dro…
The phases and magnetic properties of Co-Zr melt-spun ribbons were studied to investigate the origin of the hard magnetic phase in Co-Zr system alloys. The Co-Zr melt-spun ribbons with coercivities of 1.5-2.7 kOe consisted of a metastable Co/sub 5/Zr phase together with fcc-Co and Co/sub 23/Zr/sub 6/ phases. Annealing…
Abstract Estolides are a group of FA polyesters resulting from ester bond formation between a hydroxyl or olefinic group of one FA and the terminal carboxyl group of a second FA. These products are commonly found in trace amounts, forming tetraglycerides in several oil seed plants, and have been produced by acid clay…
The electronic properties of hydrogen and oxygen terminated surfaces of polycrystalline diamond films are investigated in the dark and under illumination by temperature dependent surface conductivity, field dependence of photocurrent and spectrally resolved photoelectron yield measurements. The as grown characteristic…
Helium desorption from Fe-based model alloys irradiated by energetic helium ions was measured during post-irradiation annealing to investigate the energetics and kinetics of formation and annihilation of helium-related defects. Desorption temperatures were observed to be widely ranged from 450 to 1500 K, indicating th…
Differential electrochemical mass spectrometry (DEMS) and Fourier transform infrared spectroscopy (FTIRS) are used to provide evidence of the existence of a free metal surface under electrodeposited polyaniline (PANI) films. With this purpose, both methanol oxidation and CO adsorption are studied on Pt electrodes modi…
Samples of Sr 2 Fe 2− x Mo x O 6 were prepared by solid‐state reaction in air and 5%H 2 –95%N 2 . X‐ray diffractometry was used to identify the phases and evaluate the lattice parameters. It is found that molybdenum ions can dissolve in the SrFeO 3 even if the sample is heated in air but the solubility is limited. The…
A new continuum model for directional tensile failure has been developed that can simulate weakening and void formation due to directional tensile failure. The model is developed within the context of a properly invariant nonlinear thermomechanical theory. A second order damage tensor is introduced which allows simula…
Simple and understandable activities involving the manufacturing of hamburgers can be used as an analogy for stoichiometric concepts and calculations.
New aromatic silicon-containing poly(imide-amide)s have been synthesized by solution polycondensation of various aromatic diamines having ether bridges between phenylene rings with a diacid chloride containing silicon. These polymers are easily soluble in polar amidic solvents such as N-methyl-pyrrolidinone or dimethy…
In the present paper we report the simultaneous synthesis of single-walled carbon nanotubes (SWCNTs) and multi-walled carbon nanotubes (MWCNTs) by spray-pyrolysis, a type of chemical vapour deposition (CVD) method. The technical characteristics of the home-made experimental set-up are given. The synthesis involves the…
6,7-dimethyl-8-ribityllumazine synthase (lumazine synthase) catalyzes the condensation of 5-amino-6-ribitylamino-2,4(1H,3H)-pyrimidinedione and 3,4-dihydroxy-2-butanone 4-phosphate. Presteady state kinetic experiments using the enzyme from the hyperthermophilic bacterium Aquifex aeolicus were monitored by multiwavelen…