Materials Literature
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Aliphatic polypyromellitimides having high crystallinity were synthesized by the high-pressure thermal polycondensation of the nylon-salt-type monomers XPME composed of aliphatic diamines and pyromellitic acid p-diethyl esters. The polymer-forming reactivity of the salt monomers XPME was comparable to that of the pare…
The microscopic a parameter, which alone is needed to describe the surface sensitive dependence of second-harmonic generation from jellium metals, is calculated within a time-dependent local-density-functional approximation for frequencies between zero and twice the bulk plasmon. The calculations incorporate an extrin…
New types of second-order nonlinear optical properties of hexagonal ${\mathrm{YMnO}}_{3}$ have been studied, caused by the coexistence of the noncentrosymmetric ferroelectric ordering of charges and the centrosymmetric spin ordering below its Neel temperature ${T}_{N}.$ Using time-dependent perturbation theory and the…
Compositionally modulated structures consisting of La2/3Ca1/3MnO3 ferromagnetic (FM) layers and La1/3Ca2/3MnO3 antiferromagnetic (AF) layers, with layer thickness 1.5 nm ⩽tFM,tAF⩽6 nm, were grown on (100)LaAlO3 by pulsed laser deposition. Thermomagnetic and isothermal magnetic measurements reveal an exchange-biasing m…
The surface shape and the spatial distribution of strain in GaInAs/InP multilayer gratings is experimentally determined by combining high-resolution x-ray diffraction and grazing-incidence diffraction. Dramatic deformations of the diffraction patterns in the measured reciprocal space maps of such gratings indicate a s…
Electrical resistivity (ρ), magnetoresistance (MR) and magnetization (σ) for Heusler type alloys Fe 2+ x V 1- x Al with -0.10≦ x ≦0.20 were measured. A giant magnetoresistance (GMR) of about 40% was observed for the weakly inhomogeneous ferromagnet Fe 2.1 V 0.9 Al at 4.2 K in 130 kOe. In the ferromagnetic alloys ( x ≧…
Time-resolved light scattering experiments have been performed on the two-step phase separation process for a binary mixture of deuterated polybutadiene and protonated polyisoprene with the critical composition. The first-step phase separation was induced by quenching the system from a temperature T0 in a single-phase…
The dynamic structure factor, S ( Q , E ), of liquid lithium ( T = 475 K) has been remeasured by inelastic X-ray scattering (IXS) in an extended momentum transfer region ( Q = 1.4–110 nm −1 ) and with improved energy resolution (down to 1.5 meV). These new data on such prototypical simple liquid allow to observe the f…
Nonlinear time evolution of phase-separating structures in the two-step phase separation process was investigated for a deuterated polybutadiene–polyisoprene mixture by using a time-resolved light scattering technique. The mixture studied has a lower critical solution temperature type phase diagram with a spinodal tem…
ε-Caprolactone (ε-CL) has been mixed with ZnCl2 at different mol ratios. The resulting complex was characterized through 1H and 13C NMR spectroscopy in bulk and in solutions, differential scanning calorimetry (DSC), wide-angle X-ray diffraction (WAXD), and optical microscopy. Ring-opening polymerization of ε-caprolact…
A poly(isoprene-b-ethyleneoxide) diblock undergoes multiple ordered state transitions: from a crystalline lamellar (L c ), to a hexagonal (Hex) mesophase, to a bicontinuous cubic phase (Gyroid) before disordering (Dis). We have studied the kinetics of the Hex-to-Gyroid, Hex-to-L c and L c -to-Gyroid transitions using…
The growth of narrow single-wall carbon nanotubes through adduction of small carbon clusters is studied using a molecular-dynamics simulation method. Statistical behavior of the growth and defect formation process is analyzed. For ${C}_{2}$ dimer colliding onto the side-wall of narrow single-wall nanotubes, it is very…
Boron carbonitride (BCN) films with various compositions have been prepared by bias-assisted hot filament chemical vapor deposition. The three elements of B, C, and N are chemically bonded with each other and an atomic-level BCN hybrid has been formed in the films. The deposited films are composed of turbostratic stru…
Collagen VI: a beaded filament forming collagen Collagen VII and the formation of anchoring fibrils Collagen VIII Collagen X Collagen IX Collagen XII Collagen XIV Collagen XVI Collagen XIX Bibliography Sequence Alignments
Impulsive stimulated thermal scattering (ISTS) studies are conducted on glycerol in the supercooled liquid range. ISTS is used to measure the Debye–Waller factor, and to characterize the structural relaxation dynamics in the range from a few nanoseconds to hundreds of microseconds. The results are compared to predicti…
Direct pattern transfer onto poly(vinylidene fluoride) was achieved by using x-ray photons from a synchrotron radiation source. Quadrupole mass spectrometry and ultraviolet photoemission spectroscopy, combined with ab initio molecular orbital calculations, were employed to investigate the mechanism of direct photomicr…
The stability of ternary blends of two immiscible homopolymers and a block copolymer compatiblizer depends crucially on the effective interaction between the copolymer monolayers that form between the unlike homopolymer domains. Here, the interaction is calculated for blends involving A and B homopolymers of equal siz…
Pb[Yb 1/2 Nb 1/2 ]O 3 – PbTiO 3 (PYbN-PT)/SrRuO3 (SRO) capacitors with Pt top electrodes were grown by pulsed laser deposition onto (100)pc LaAlO3 (LAO) and (111)c SrTiO3 (STO) substrates (the subscripts pc and c refer here to the pseudocubic and cubic perovskite cells, respectively). Suitable changes in both the subs…
We have systematically studied superconducting instabilities in the repulsive Hubbard model for d-wave and p-wave pairing in various 2D and 3D lattices. Using fluctuation exchange approximation, we consider 3D face centered cubic lattice, 3D body centered cubic lattice, 3D simple cubic lattice, 2D square lattice and 2…
Previous results for surface linear optical response in centrosymmetric para-nitroaniline crystals are combined with literature values for the molecular first hyperpolarizability to calculate the surface-induced quadratic response. The average surface quadratic susceptibilities for incident light at a wavelength of 80…