Materials Literature
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We report the results of a first principles study on the clean and the reduced CrO2(100) surface. It is shown that both surfaces retain the half-metallicity because they share a common feature: the surface Cr atom also behaves like an isolated ion. Thus, the half-metallicity of the CrO2 surfaces can be qualitatively u…
In-vessel mirrors are necessary for optical and laser diagnostics of plasmas in next-step fusion devices; however obtaining mirror materials that will maintain their performance in the harsh fusion environment remains problematic. At present, mirrors are fabricated from polycrystals or monocrystals, and metal films on…
Scattering of $s$-polarized plane waves by finite-thickness periodic structures is studied, which contain components made of ultralow-permittivity metamaterial (ULPM), and therefore exhibit intermediate properties between those made of pure metals and of pure dielectrics. The numerical results presented demonstrate ba…
Abstract The interactions between hydroxypropylmethylcellulose (HPMC) and poly(acrylic acid) (PAA) as well as poly(methacrylic acid) (PMAA) resulting in formation of hydrophobic interpolymer complexes (IPC) via hydrogen bonding have been studied in aqueous solutions in acidic medium. The formation of IPC of two differ…
The dielectric relaxation due to interfacial charges in metal particle-filled composites occurs in the optical (high frequency) regime. However, many applications would benefit from a shift of the relaxation to a much lower frequency regime (e.g. radio or microwave range). This could be achieved by using a filler with…
The magnetic moment induced by an external magnetic field of 5.8 T on the Co 3+ ions in LaCoO 3 has been measured by polarized neutron diffraction. Measurements were made at 100 K, near to the susceptibility maximum usually associated with a gradual spin-state transition, as well as at 1.5 and at 285 K. The data give…
In present day fusion devices optimization of the performance and experimental freedom motivates the use of low- Z plasma facing materials (PFMs). However, in a future fusion reactor, for economic reasons, a sufficient lifetime of the first wall components is essential. Additionally, tritium retention has to be small…
We have made epitaxial and polycrystalline thin films of multiferroic ${\mathrm{BiFeO}}_{3}$ on different substrates [(001) and (111) ${\mathrm{SrTiO}}_{3}$, (001) and (111) ${\mathrm{LaAlO}}_{3}$, (001) $\mathrm{MgO}$, and (0001) sapphire] by pulsed-laser deposition. We investigated the second harmonic generation (SH…
In this paper, the influence of carbon and silica particle slurry concentration up to 20 g/l (4 vol%) on regime transition, gas hold-up, and volumetric mass transfer coefficient is studied in a 2-dimensional slurry bubble column. From high speed video image analysis, the average large bubble diameter, the frequency of…
We report first-principles total-energy calculations that provide energetics and electronic structures of adsorbed carbon nanotubes (CNTs) on stepped Si(001) surfaces. We find that adsorption energies strongly depend on the directions of CNTs, and that there are several metastable adsorption sites both on terraces and…
Novel aliphatic poly(ester−amide)s with a periodic sequential structure consisting of ester and amide groups were synthesized by two-step polycondensation reactions using adipate, butane-1,4-diamine, and linear diols with different chain lengths, ranging from 3 to 6 methylene groups. Effects of the monomeric structure…
Ti ∕ Au Ohmic contacts on heavily Al-doped (n∼1019cm−3) n-ZnO produce low specific contact resistivity of 2.4×10−7Ωcm2 in the as-deposited condition and extremely low minimum values of 6×10−8Ωcm2 after annealing at 300°C.The contact resistance is independent of measurement temperature after low temperature anneals, su…
Molecular beam techniques are used to grow water films on Pt(111) with incident collision energies from 5 to 205 kJ/mole. The effect of the incident collision energy on the phase of vapor deposited water films and their subsequent crystallization kinetics are studied using temperature programmed desorption and infrare…
The dynamics of exciton decay and spin dephasing in an ensemble of CdSe quantum dots grown in a glass matrix has been investigated by studying the polarized time-integrated four-wave mixing signal at $10\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. Quantum dots of equal size, but with different growth conditions, have been…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTTrilayer Crystalline Lamellar Morphology under ConfinementTsai-Ming Chung, Rong-Ming Ho, Jing-Chung Kuo, Jing-Cherng Tsai, Benjamin S. Hsiao, and Igors SicsView Author Information Department of Chemical Engineering, National Tsing H…
We present an unexpected product of the HAuCl4–Na2S reaction, gold tabular nanostructures, which have a surface plasmon resonance peak in near infrared region.
We have measured the M\"ossbauer spectra of magnetite $({\mathrm{Fe}}_{3}{\mathrm{O}}_{4})$ under a pressure of up to $18\phantom{\rule{0.3em}{0ex}}\mathrm{GPa}$ at room temperature using nonenriched high-quality samples. An analysis of the observed M\"ossbauer spectra confirms that ${\mathrm{Fe}}_{3}{\mathrm{O}}_{4}$…
Liquid and supercritical carbon dioxide-in-water (C/W) and water-in-carbon dioxide (W/C) macroemulsions (Pickering emulsions) stabilized by fine particles were created in a high-pressure batch reactor. C/W macroemulsions form when hydrophilic particles, such as pulverized limestone, sand, flyash, shale, and lizardite,…
This paper presents a top-level review of global, regional and local (UK) research into dielectrics, as materials, and into related dielectric phenomena, measurements, technologies and applications. The review focuses on three questions: 'Is dielectrics research in growth or decline?', 'How is dielectrics research dif…
The relationships between the viscoelastic and structural properties of glass-forming materials with polysiloxane bonds, which serve as network formers, and phenyl groups, which act as network terminators, are examined based on shear viscoelasticity, (29)Si MAS NMR, and GPC measurements during the early stages of the…