Materials Literature
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We have grown epitaxially orientation-controlled monoclinic VO2 nanowires without employing catalysts by a vapor-phase transport process. Electron microscopy results reveal that single crystalline VO2 nanowires having a [100] growth direction grow laterally on the basal c plane and out of the basal r and a planes of s…
The Seebeck coefficient, electrical conductivity, and thermal conductivity of individual chromium disilicide nanowires were characterized using a suspended microdevice and correlated with the crystal structure and growth direction obtained by transmission electron microscopy on the same nanowires. The obtained thermoe…
The adsorption of dicarboxylic acids by kaolinite and montmorillonite at different pH conditions was investigated using in situ attenuated total reflectance Fourier transform infrared (ATR-FTIR) and ex situ diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy. The sorption capacity of montmorillonite wa…
Ag–Au alloy nanoparticles with tunable size and composition were prepared by a replacement reaction between Ag nanoparticles and HAuCl 4 at elevated temperatures. The formation of homogeneous alloy nanoparticles was confirmed by selected-area energy-dispersive x-ray spectroscopy (SAEDX), UV–visible absorption spectros…
We report a steplike lattice transformation of single crystalline (La$_{0.4}$Pr$_{0.6}$)$_{1.2}$Sr$_{1.8}$Mn$_{2}$O$_{7}$bilayered manganite accompanied by both magnetization and magnetoresistive jumps, and examine the ultrasharp nature of the field-induced first-order transition from a paramagnetic insulator to a fer…
Fridge magnet: A decametallic mixed-valent Mn supertetrahedron (see picture; M purple, O red, N blue, Br brown, C gray) displays dominant ferromagnetic exchange and a spin ground state of S=22. The magnetic behavior of the cluster makes it suitable for use as a low-temperature magnetic refrigerant.
A fluorescent chemosensor to detect saturated nitramine and nitrate ester explosives was devised based on a photochemical reduction reaction. 10-Methyl-9,10-dihydroacridine (AcrH 2 ) was found to transfer a hydride ion equivalent to the high explosives RDX and PETN upon irradiation at 313 nm in degassed acetonitrile s…
Polycrystalline n-ZnO/p-Cu2O heterojunctions have been fabricated by low-temperature eletrodepositions of ZnO and Cu2O layers in aqueous solutions. The condition for forming the Cu2O layer significantly reflected the electrical rectification characteristic and the photovoltaic performance, and the heterojunction fabri…
In the rich and long-standing literature on the flow-induced formation of oriented precursors to polymer crystallization, it is often asserted that the longest, most extended chains are the dominant molecular species in the "shish" of the "shish-kebab" formation. We performed a critical examination of this widely held…
To understand the electronic mechanisms for the electric-field sensitive second-harmonic response of di-8-4-(2-[6-(dioctylamino)-2-naphthalenyl]ethneyl)-1-(3-sulfopropyl) pryridinium inner salt in biological membranes, we have measured its nonlinear optical hyperpolarizability using a combination of hyper-Rayleigh sca…
The Sparkle/PM3 model is extended to praseodymium(III), and ytterbium(III) complexes. The same two sets of 15 complexes used to parameterize Sparkle/AM1, were used as training sets. The validation procedure included additional high quality crystallographic structures for a total of 48 structures of Pr(III) complexes,…
The recently defined Sparkle model for the quantum chemical prediction of geometries of lanthanum(III) and lutetium(III) complexes within AM1 (J. Phys. Chem. A 2006, 110, 5897) has been extended to PM3. As training sets, we used the same two groups, one for each lanthanide, of 15 high-crystallographic-quality (R facto…
Polystyrene / polymethyl methacrylate (PS-PMMA) thin films were analyzed for detecting phase separation as well as probing their electrical responses by XPS. It was also shown that electrical parameters like resistance or capacitance can also be extracted using dynamical XPS measurements. A Kratos ES300 electron spect…
Abstract Polyurethanes (PUs) were prepared from 4,4′‐diphenylmethane diisocyanate and various molecular weights of poly(tetramethylene glycol) and polydimethylsiloxane. The physical properties of these polymers were determined using Fourier transform infrared spectroscopy and through calculation of their swelling rati…
We report a way of obtaining the magnetocaloric effect due to the crystal electrical-field quenching of the total angular momentum in a magnetic system where a strong spin reorientation is present. The theoretical model is applied to $\mathrm{Dy}{\mathrm{Al}}_{2}$ and the results predict a considerable magnetic entrop…
Abstract The densities of two polymer/CO 2 single‐phase solutions, poly(ethylene glycol) (PEG)/CO 2 and polyethylene (PE)/CO 2 , were measured at temperatures higher than melting temperature of the polymer under CO 2 pressures in the range 0–15 MPa using a newly‐proposed gravimetric method. A magnetic suspension balan…
Raman scattering (RS) spectroscopy is a popular measurement technique that uses inelastic scattering of monochromatic light to study vibrational characteristics of a material system. A typical application of RS is for material structure determination. This paper describes the application of RS for the characterization…
The magnetic nature of the spinel antiferromagnet $\mathrm{Li}[{\mathrm{Li}}_{x}{\mathrm{Mn}}_{2\ensuremath{-}x}]{\mathrm{O}}_{4}$ with $x=0--0.15$ has been studied with muon-spin rotation and relaxation $({\ensuremath{\mu}}^{+}\mathrm{SR})$ spectroscopy. Both weak-transverse-field and zero-field ${\ensuremath{\mu}}^{…
Pulsed laser deposited epitaxial ${\mathrm{Pr}}_{x}{\mathrm{Co}}_{100\ensuremath{-}x}$ $(x=8.7--27.6\phantom{\rule{0.3em}{0ex}}\mathrm{at.}\phantom{\rule{0.2em}{0ex}}%)$ thin films were systematically studied as a function of Pr content. Structural and magnetic measurements reveal different phases for specific composi…
Abstract We have prepared new polyesters containing quadratic, nonlinear optical (NLO) active chromophores covalently incorporated into the main chain. In these polymers, the sequence of the chromophore units along the main chain is rigorously head to tail. All the polyesters are processable, both in the melt and in s…