Materials Literature
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The scattering of a diblock copolymer micelle has been simulated using Monte Carlo techniques. The scattering is analyzed using a novel model, where the corona is represented as a dilute/semidilute polymer solution with a radial profile. This approach decouples the scattering due to interaction and connectivity induce…
The phase diagram of coexisting liquid−liquid phase separation (LLPS) and crystallization in nearly isorefractive blends of statistical ethylene/hexane (PEH) and ethylene/butene (PEB) copolymers has been investigated. A variety of techniques that exploit crystallization-induced contrast, such as diffuse light scatteri…
A spontaneous or field induced "hidden" phase transition with antiferromagnetic-to-ferromagnetic reordering is disclosed in multiply frustrated hexagonal ErMnO3. It is revealed by Faraday rotation and second harmonic generation as sublattice-sensitive probes to the Er and Mn systems. The acquired phase diagram in the…
The hydrolysis of magnesium methoxide in methanol or methanol−toluene solvents with a water-to-methoxide molar ratio of 2 has been studied. The gel obtained from the hydrolysis of magnesium methoxide appears to be polymeric based on the mass fractal dimensions and TEM micrographs. The presence of toluene accelerates t…
The CO 2 sorption and the consequent swelling of un-cross-linked poly (dimethylsiloxane) (PDMS) have been measured simultaneously at high pressure using in-situ ATR (Attenuated Total Reflectance)−IR spectroscopy. The absorbance of the ν 3 (2335 cm -1 ) band of CO 2 dissolved in PDMS was used to determine quantitative…
A number of equations for the melting temperature dependence on pressure, ${T}_{m}(P),$ based on the two- and one-phase approaches to melting have been obtained. All melting curves have the form ${T}_{m}=F(P)D(P),$ where $F(P)$ is the Simon (rising) melting equation and $D(P)$ is the damping function, which asymptotic…
The chain length dependence of excitation energies of oilgomers of polyene, p -phenylene, pentafulvene, cyclopentadiene, pyrrole, furan, silole, phosphole, and thiophene was studied employing the time-dependent density functional theory with B3LYP functional. Band gaps and effective conjugation lengths of the correspo…
In this paper, the Curie temperature of ferroelectric films is studied using spin-1/2 transverse Ising model with long-range interaction within the framework of the effective-field theory. The dependence of the Curie temperature on the thickness of the film, the surface interaction and the transverse field were invest…
Nanocrystalline composites are finding applications in high-radiation environments due to their excellent mechanical and electronic properties. We show, however, that at the smallest particle sizes, radiation damage effects can be so strongly enhanced that under the right conditions, materials that have never been mad…
Nanocrystallites of nonstoichiometric copper selenide (Cu(2-x)Se) and stoichiometric copper selenides (beta-CuSe and Cu(3)Se(2)) were synthesized in different solutions via sonochemical irradiation at room temperature. The influence of solvents, surfactants, and ultrasonic irradiation on the morphology and phase of pr…
We report on the electrical modulation of double exchange ferromagnetism at room temperature in hole-doped manganites of a metal oxide $p\ensuremath{-}n$ junction. In this $({\mathrm{La}}_{0.9}{\mathrm{Ba}}_{0.1}){\mathrm{MnO}}_{3}/\mathrm{Nb}$ doped ${\mathrm{SrTiO}}_{3}$ $p\ensuremath{-}n$ junction, the temperature…
The stability and reproducibility of most SERS-active electrode surfaces are far from ideal. We have focused on this problem by developing and characterizing a metal film over nanosphere (MFON) electrode which solves these shortcomings. Atomic force microscopy (AFM), cyclic voltammetry, and surface-enhanced Raman spec…
We propose a new approach for analysis of Auger electron spectra (AES) of polymers by density functional theory (DFT) calculations with the Slater's transition-state concept. Simulated AES and X-ray photoelectron spectra (XPS) of four polymers [(CH2CH2)n (PE), (CH2CH(CH3))n (PP), (CH2CH(OCH3))n (PVME), and (CH2CH(COCH…
In a previous paper [Heremans et al., Phys. Rev. Lett. 86, 2098 (2001)] we reported how the geometry of a sample of lightly p-type InSb can be manipulated to create a very large change of the thermoelectric power with magnetic field. That effect was called the geometrical magnetothermopower (GMT). In this paper, we re…
We study the electronic states of different GaAs-AlAs Fibonacci, Thue-Morse and Rudin-Shapiro quasiperiodic heterostructures grown along the [001] direction. We employ an empirical tight-binding Hamiltonian including spin-orbit coupling together with the surface Green-function matching method. We present results for d…
Abstract A cheap acrylic AB* monomer, 2‐(2‐chloroacetyloxy)‐isopropyl acrylate (CAIPA), was prepared from 2‐hydroxyisopropyl acrylate with chloroacetyl chloride in the presence of triethylamine. The self‐condensing vinyl polymerization by atom transfer radical polymerization (ATRP), a “living”/controlled radical polym…
Investigations of the thermal evolution of the structural and dynamic properties of small cobalt clusters in melt are performed using molecular-dynamics simulations with a Finnis-Sinsclaire potential. The mean square displacements, atomic volume, and internal energy, as well as the pair correlation function and bonded…
Abstract A novel process of surface modification of silica fillers has been performed by coating with an acrylate monomer, trimethylol propane triacrylate (TMPTA) and with a silane coupling agent, triethoxy vinyl silane (TEVS), followed by electron beam irradiation of these coated fillers. The surface‐modified fillers…
Abstract The basic crystallization and melting behavior of three aliphatic polyketones were studied using differential scanning calorimetry (DSC), wide‐angle X‐ray diffraction (WAXD), small‐angle X‐ray scattering (SAXS), and optical microscopy. One resin was a perfectly alternating copolymer of ethylene and carbon mon…
Abstract Thermal degradation of polyphenylene sulfide (PPS) film was investigated in air, nitrogen, helium, and argon with different physical and reactive characteristics from room temperature to 790°C by a high‐resolution thermogravimetry (TG) at a variable heating rate in response to the changes in the sample's weig…