Materials Literature
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The hydrogen bonds in films of the polyurethane and the core-shell type polyacrylate-polyurethane microemulsions have been studied by FTIR spectroscopy in the regions of NH absorption and CO absorption. The effects on hydrogen bonds of the composition, the core-shell ratio were revealed. At the same time, the relati…
The surface structure of the ring-banded spherulites in polymer blends PCL/SAN (90/10) was studied by optical microscopy, SEM, and TEM, respectively. It is interesting to find that the surface structure of the ring-banded spherulites in polymer blends PCL/SAN (90/10) is made up of the convex bands. The landscape of th…
We present ab initio total energy calculations of the adsorption energy of one Pd monolayer on ${\mathrm{MoS}}_{2}(1000).$ We consider four different adsorption sites: the Pd atoms on top of Mo, on top of the hole site, on top of the surface S, and on the bridge position halfway between two adjacent S atoms. The large…
We have developed a new scaling property of the conductivity spectra of fluoride glasses. This property predicts the existence of a universal ionic relaxation in these glasses. The relaxation process in fluoride glasses is observed to be independent of temperature as well as the nature and concentration of the ionic c…
Semiconducting films of CdS grown by a modified close-spaced vapor transport hot-wall technique were studied by photoluminescence (PL) in the range of 10–300 K. The films were grown with an Ar pressure of 100 mTorr, the substrate temperature (Tsu) varied between 500 and 700 °C, while the source temperature (Tso) was k…
A binuclear Cu(II) complex of [(Cu(2)(HAP)(2)IPA)(OH)(H(2)O)](ClO(4))(2).H(2)O (HAP = 3-amino-1-propanol; IPA = 2-hydroxy-5-methylisophthalaldehyde) has been synthesized and characterized by X-ray crystallography, by solid state magnetic susceptibility, and in solution by (1)H NMR studies. The binuclear copper(II) com…
In this article, we report on spectroscopic studies of Pr3+:Yb3+ codoped lead fluoroindogallate glasses. By pumping with a diode laser in 0.98 μm, it was verified that the intensity of infrared luminescence at 1.3 μm of Pr3+ (1G4→3H5) is highly increased (approximately 40 times) by the presence of Yb3+. Anti-Stokes lu…
Deuterium solid-state NMR was used to study the dynamics and molecular structure of the serine (Ser) side chains in silk fibroin from Bombyx mori and from Samia cynthia ricini . Samples were selectively labeled with [3,3- 2 H 2 ]Ser, and the 2 H NMR powder spectra were analyzed by line shape simulation. Two types of m…
Spin susceptibility $\ensuremath{\chi}$ obtained by electron spin resonance in quasi-one-dimensional halogen-bridged mixed metal complexes ${\mathrm{Ni}}_{1\ensuremath{-}x}{\mathrm{Pd}}_{x}(\mathrm{cyclohexandiamine}{)}_{2}{\mathrm{Br}}_{3}$ $(0<~x<~1)$ shows a crossover from Curie-like to weakly temperature-dep…
The metastable dicarbon center $({\mathrm{C}}_{s}--{\mathrm{C}}_{i})$ in silicon has been studied by infrared absorption spectroscopy. After electron irradiation of carbon-doped silicon, new infrared absorption lines at 540.4, 543.3, 579.8, 640.6, 730.4, and $842.4 {\mathrm{cm}}^{\ensuremath{-}1}$ are observed. The li…
Infection of implanted cardiovascular biomaterials still occurs despite inherent host defense mechanisms. Using a rotating disk system, we investigated Staphylococcus epidermidis and polymorphonuclear leukocyte (PMN) adhesion to a polyetherurethane urea (PEUU-A') under shear stress (0-17.5 dynes/cm2) for time periods…
Simulation results of the thermal conductivity ℒ of the Dissipative Particle Dynamics model with Energy Conservation (DPDE) are reported. We also present an analysis of the transport equations and the transport coefficients for DPDE based on a local equilibrium approximation. This approach is valid when the particle–p…
Aliphatic polyimides containing adamantyl units (APIs) were prepared by the poly(addition/condensation) of a dianhydride bicyclo[2.2.2]octane-2,3,5,6-tetracarboxylic 2,3 : 5,6-dianhydride with a rigid diamine, 1,3-diaminoadamantane or 3,3′-diamino-1,1′-biadamantyl, and a flexible diamine, 4,4′-methylenebis(cyclohexyla…
Various physical properties of Y 2- x Bi x Ru 2 O 7 have been studied. The critical temperature T G of a spin-glass transition observed in the system decreases with x and goes to zero at x = x c in the region of the insulator-metal phase boundary. The low temperature specific heat coefficient γ increases with decreasi…
Fully atomistic molecular modeling is performed on an electric field poled guest-host nonlinear optical polymer system at two different densities. The higher density (HD) represents a sub-Tg system, while the lower density (LD) corresponds to a system above Tg. The electric field alignment of dopants was studied by ca…
The magnetic properties of double perovskite oxide Sr 2 FeWO 6 have been reported. The magnetic susceptibility and Mössbauer effect of 57 Fe show that this compound is an antiferromagnet with T N =37 K. The Mössbauer parameters below ∼20 K are the center shift of +1.2 mm/s relative to metallic iron, the quadrupole spl…
An interatomic potential model has been developed for molecular-dynamics simulations of TiO2 (rutile) based on the formalism of Streitz and Mintmire [J. Adhes. Sci. Technol. 8, 853 (1994)], in which atomic charges vary dynamically according to the generalized electronegativity equalization principle. The present model…
We performed a photoemission investigation of the electronic structure of ${\mathrm{PrNiO}}_{3}$ and ${\mathrm{NdNiO}}_{3}$ through the first order (paramagnetic) metal to (antiferromagnetic) insulator transition. Surprisingly, the data reveal a temperature-dependent loss of spectral weight near the chemical potential…
Acetyl-coenzyme A (acetyl-CoA) synthetase (ADP forming) represents a novel enzyme in archaea of acetate formation and energy conservation (acetyl-CoA + ADP + P(i) --> acetate + ATP + CoA). Two isoforms of the enzyme have been purified from the hyperthermophile Pyrococcus furiosus. Isoform I is a heterotetramer (alpha(…
Heat dissipation becomes an important issue for highly compacted integrated circuit chips because of device performance and reliability concerns. Thermoelectric cooling has been considered as one of the possible solutions for cooling high density, locally heated integrated circuits. It excels in scalability and reliab…