Materials Literature
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A method of constructing <30-nanometer structures in close proximity with precise spacings is presented that uses the step-by-step application of organic molecules and metal ions as size-controlled resists on predetermined patterns, such as those formed by electron-beam lithography. The organic molecules serve as a ru…
The mechanisms of photo-induced microstructures in an azobenzene polymer film are presented. They are based on the spatial periodic modulation of optical intensity and the photoisomerization of azobenzene molecules with the movement of main chains. Experiment and theory jointly point out the possibility of photo-induc…
The microstructures of Na 2 Si 2 O 5 from room temperature up to 1773 K are studied by high-temperature Raman spectroscopy. Deconvolutions of complex Raman spectra of crystal and amorphous states (glass and melt) are described. The results show that the temperature-dependent Raman spectra clearly indicate phase transi…
ZnS x Se 1- x (0< x <1) nanocrystalline films were deposited onto quartz substrates by a dc magnetron sputtering technique. The optical properties of the films were studied at room temperature (~300 K). The optical absorption was found to be dominated by the combined effects of optical losses due to absorption and sca…
The effects of titanium content on the properties of silica-titania films by the sol-gel method using γ-glycidoxypropyltrimethoxysilane (GLYMO), tetraethoxysilane (TEOS) and tetrapropylorthotitanate (TPOT) as the starting materials have been investigated. Atomic force microscopy (AFM), ellipsometry, thermal gravimetri…
The nonlinear-optical coefficients of R COB ( R = Gd, Y) crystals are measured. The spatial distribution of d eff (effective nonlinear-optical coefficient) is subsequently determined. Our experiments show that the maximum d eff occurs at the second quadrant. The second-harmonic generation efficiency reaches 48% for a…
An attempt has been made to interpret the anomalous properties of supercooled water in a unified way by using Stillinger's postulate that the formation of bulky clathrate-like local structures is the main cause of the anomalous thermodynamic and transport properties exhibited by liquid water at low temperatures. Compa…
The vibrationally resolved 488 nm negative ion photoelectron spectra of V3O, Nb3O, and Ta3O provide measurements of their electron affinities, vibrational frequencies, and low-lying electronic state energies. The electron affinities increase smoothly down the triad with values (eV) of 1.218±0.008 for V3O, 1.393±0.006…
Ultrafast laser spectroscopy has been used to measure the electron–phonon coupling constant in PtAu core–shell bimetallic nanoparticles. A chemical reduction method was used to prepare Pt cores of 12.5 nm diameter and a γ-radiolytic deposition technique was then used to grow Au shells of variable thickness. The result…
Three new di-tert-butylbipyridine (dbbpy) complexes of platinum(II) (1-3) containing 1,1-dithiolate ligands have been synthesized and characterized. The 1,1-dithiolates are 2,2-diacetylethylene-1,1-dithiolate (S(2)C=C(C(O)Me)2) (1), 2-cyano-2-p-bromophenylethylene-1,1-dithiolate (S(2)C=C(CN)(p-C(6)H(4)Br)) (2), and p-…
A CeO 2 film with a thickness of about 80 nm was deposited by a mass-analysed low-energy dual ion beam deposition technique on an Si(111) substrate. Reflection high-energy electron diffraction and x-ray diffraction measurements showed that the film is a single crystal. The tetravalent state of Ce in the film was confi…
We report on self-consistent polymer reference interaction site model (PRISM) calculations as well as molecular dynamics (MD) simulations for several types of polyolefins. For all polymer types one single set of potential parameters was used. In general we find good semi-quantitative agreement between PRISM and MD res…
The dc conductivity of MoO 3 -TeO 2 glasses prepared by melt quenching has been investigated in the temperature range 323-473 K. Seebeck coefficient measurements indicate the glasses to be n-type. The conductivity increases with increase of MoO 3 content and at 418 K varies from about 6 × 10 -6 to 1 × 10 -8 S cm -1 .…
We are studying the phase behavior of a suspension of platelike colloids which has a very broad size distribution, particularly in thickness. This suspension exhibits an isotropic−nematic phase separation over a notably wide range of particle concentrations, displaying a remarkable phenomenon. In part of the coexisten…
The crystal structure and growth kinetics of melt-crystallized poly(butylene succinate-co-14 mol % ethylene succinate) [P(BS-co-14 mol % ES)] copolyester have been investigated at a wide crystallization temperature range of 30 to 90 degrees C. By means of wide-angle X-ray diffraction (WAXD), the copolyester composed o…
We report the results of Hall coefficient R_H and magnetoresistance (MR) measurements on single crystalline samples of Sr3Ru2O7 grown by the floating zone method. R_H was found to be positive over the entire temperature range studied (0.3 - 300K). Its temperature (T) dependence follows closely that of the magnetic sus…
Structural and magnetic properties, especially the magnetocrystalline anisotropy of DyFe 12- x Nb x compounds with x = 0.55-0.85, have been investigated. The easy magnetization directions at room temperature for all the compounds are along the c -axis. With decreasing temperature the magnetocrystalline anisotropy chan…
The influence of the strain state on the thermodynamics of hydrogen in quasi-two-dimensional potentials is reported. The host lattice is V embedded in Fe in the form of a Fe/V(001) superlattice, which represents a strongly confined absorption potential extending over just 13 monolayers. Δ H and Δ H for the continuous…
Structural and magnetic properties of the RFe 11- x Co x Ti compounds with R = Y and Er have been investigated. X-ray diffraction patterns and thermomagnetic curves show that all the synthesized compounds with x ranging from 0 to 11.0 are almost single phase and crystallize in the ThMn 12 -type structure. Substitution…
A few studies of alkali atoms deposition on the (110)-rutile surface have been reported in the last years. The process involves a selective electron transfer from the alkali atoms to the surface penta-fold Ti atoms, and it has been well characterized by both experimental and theoretical techniques. However, the adsorp…