Materials Literature
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The angular distribution of photoemission from gold thin films was studied in this paper. A theoretical model of angular distribution was first developed. Experimental measurement was then carried out from a simple set-up. The measured angular distribution was in good agreement with theoretical calculation. It was fou…
We present ambient-pressure luminescence, luminescence excitation spectra, and luminescence decays and high-pressure luminescence of chromium doped $\mathrm{CaO}\ensuremath{-}{\mathrm{Ga}}_{2}{\mathrm{O}}_{3}\ensuremath{-}{\mathrm{GeO}}_{2}$ glass material. The material has been found to be very inhomogeneous with emi…
Spin tunneling is investigated in magnetic molecules that have an easy axis with fourfold symmetry, such as ${\mathrm{Mn}}_{12}$-acetate, with emphasis on understanding the topological quenching of tunneling and the diabolical point locations in the magnetic field space. This is done using a model spin Hamiltonian tha…
An interesting way to obtain compatible blends of poly(ε-caprolactone) (PCL) and polystyrene- b -poly(ethylenepropylene) (PS−PEP) has been achieved. The intrinsically immiscible blends such as PCL/PS and PCL/PEP become compatible while the PS and PEP components form a diblock copolymer to melt blending with PCL. The m…
H 1 nuclear magnetic resonance cryoporometry has been applied to study the low-temperature phase separation of the two components in a binary liquid imbibed in porous glass. The mixture of hexane and nitrobenzene was quenched below both its upper critical temperature and the freezing point of the nitrobenzene. The siz…
BTQBT (bis-(1, 2, 5-thiadiazolo)-p-quinobis(1, 3-dithiole)) films have been prepared as active semiconducting layers of organic field effect transistors (FETs). BTQBT films showed a p-type semiconducting behavior. The hole mobility and on/off ratio of BTQBT films under ultrahigh vacuum conditions reached to 0.2 cm 2 /…
High-quality and large piezoelectric single crystals of Pb[(Zn 1/3 Nb 2/3 ) 0.91 Ti 0.09 ]O 3 (PZNT91/09) fabricated by the Bridgman method were investigated regarding the material constants and their temperature dependence. The single crystals poled along [001] of the original cubic direction possess high piezoelectr…
We apply self-consistent field theory to confined films of symmetric ABC triblock copolymer melts, where the A and C blocks are equal in size and A-B, B-C, and A-C interactions are identical. We focus on the regime where, in bulk systems, B forms the majority domain and the minority A and C domains form cylinders or s…
We investigated the growth of carbon nanotubes (CNT) directly on silicon substrates by nanoparticle-catalyst-assisted chemical vapor deposition. Single-walled CNTs were almost selectively obtained when methane was used in combination with Fe 2 O 3 nanoparticles at the growth temperature of around 950°C. In the growth…
The intrinsic viscosity [η] was determined for 23 samples of atactic oligo- and poly(α-methylstyrene)s (a-PαMS), each with the fraction of racemic diads f r = 0.72, in the range of weight-average molecular weight M w from 4.12 × 10 2 to 5.46 × 10 6 in three good solvents, toluene, 4- tert -butyltoluene, and n -butyl c…
An improvement in the contrast ratio (CR) of transmittance characteristic of polymer dispersed liquid crystal (PDLC) was achieved by doping the polymer matrix with azo-dye and then orienting the dye molecules with the photo pumping technique. The contrast ratio was measured by the light scattering technique. We invest…
Calcium carbonate crystals were grown in a CaCl 2 –Na 2 CO 3 solution containing an amino acid. We have employed 12 different types of amino acids as additives. The concentrations of noncharged-polar amino acids and those of the acidic ones in CaCO 3 precipitates are one or two orders higher than those of all of the o…
The deactivation effects of the lowest excited states of Er3+ and Ho3+ introduced in Er-or Ho-LiYF4 (YLF) crystals, codoped with Nd ions, were observed by the activator’s fluorescence decays. In the case of Er:Nd:YLF, the I13/24→4I15/2 and I11/24→4I13/2 transitions at 1.5 and 2.7 μm, respectively, were analyzed. The I…
We investigated the control of water droplets on super-hydrophobic surfaces using a static electric field. The electric field required for droplet motion was decreased as the droplet size or the height from which the droplets were released increased. The Coulomb force of the electric charge provided to the water from…
A series of natural silica impactite samples from Chicxulub (Mexico) was investigated by Raman microprobe (RMP) analysis. The data yield evidence for high-pressure shock metamorphism in the rock. The impactite contains three polymorphs of silica: the original α -quartz, and two high-pressure varieties – coesite and di…
A thin film of tin oxide (SnO 2 ) was prepared on a plastic substrate by DC magnetron roll sputtering. The deposition thickness of SnO 2 rapidly decreased with the increase of O 2 gas flow rate, even though the refractive index remained almost constant at the level of 2.0 after the flow rate exceeded 40 sccm. The SnO…
A thin film of Sn-doped and GeTe-rich GeTe-Sb<SUB>2</SUB>Te<SUB>3</SUB> shows characteristics that make it suitable for use in rewritable dual-layer optical disks employing a violet laser. By increasing the GeTe component form Ge<SUB>2</SUB>Sb<SUB>2</SUB>Te<SUB>5</SUB> to Ge<SUB>4</SUB>Sb<SUB>2</SUB>Te<SUB>7</SUB>, an…
Resonant two-photon ionization spectroscopy has been used to study the diatomic transition-metal carbide, WC. A low-resolution scan revealed a five-member vibrational progression beginning with the 0-0 band at 17 585 cm−1. Analysis of this progression yielded a vibrational frequency of ωe′(184W12C)=752.6(4.9) cm−1 and…
The kinetics of molecular nitrogen desorption from Rh(111) single-crystal surfaces covered with atomic nitrogen were characterized by both isothermal and temperature-programmed experiments. A complex kinetic behavior was observed for this system not describable by typical Arrhenius expressions even if coverage-depende…
Amorphous Ge2Sb2Te5 films were prepared by rf sputtering from the bulk alloy. Their electrical and optical properties were analyzed using impedance and optical transmission measurements as a function of temperature. From this analysis, it is found that the glass transition temperature of the as-prepared amorphous film…