Materials Literature
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The reaction of 1,2-dihydroxy-benzene (pyrocatechol) (C6H6O2) with iron oxide (Fe2O3) and sodium thiosulfate (Na2S2O3) in aqueous medium (pH 7) was investigated. Pyrocatechol suffers autoxidation and coordinates with Fe3+ in solution. The presence of S2O3(2-) in solution was fundamental to generate and stabilize the p…
In a recent study, the transition metal complex, cis-dichlorobis(2-,2'-dipyridyl)ruthenium (II) (Ru(bpy)2Cl2), and the macrocycle Ru(TPP)CO (TPP:- tetraphenylporphine) were bound to pyridine terminated self-assembled monolayers on quartz. Following modification of the quartz surface with metal complexes, the conductin…
We present dynamic Monte Carlo lattice simulations of the coil to globule collapse of single chains of a copolymer comprising monomer units, m and c, wherein there is a net attractive interaction between c- units. As the copolymer is cooled, the solvent quality becomes poorer, and the size of the chain decreases, driv…
Superconducting power cables with so-called "cold dielectric" insulation system normally use tape dielectrics impregnated with pressurized liquid nitrogen (LN2). The AC and lightning impulse (LI) dielectric strength of four commercially available dielectrics have been measured under nitrogen pressures in the range 0.1…
Investigations on the excited state absorption signal of 5,10,15,20-tetra(4-pyridyl)-21H,23H-porphyrin, modified by either changing the central ion or adding peripheral groups, were performed using 5 ns laser pulses at 532 nm, in association with linear absorbance and fluorescence decay time measurements. The reverse…
The reaction of 2,5-dimethylthiophen-3-ylacetic acid with 2,5-dimethylthiophen-3-ylacetyl chloride gave 3,4-bis(2,5-dimethylthiophen-3-yl)furan-2(5 H )-one which was converted into a series of 5-methylidene and 5-arylmethylidene derivatives.
Abstract The surface crystallization of three different polyhydroxy alkanoates (PHAs), poly(3-hydroxybutyrate) (PHB), PHB-co-5 weight percent 3-hydroxyvalerate (PHBV5), and PHB-co-12 weight percent 3- hydroxyvalerate (PHBV12), under different processing conditions is analyzed with depth profiling attenuated total refl…
Magnetoelectric (ME) antiferromagnetic Cr2O3, being exchange coupled to a ferromagnetic multilayer (Pt/Co/Pt)n, n ≥ 1, is treated as a multiphase multiferroic material with sophisticated multifunctional properties. It is shown that the exchange bias (EB) of the ferromagnetic hysteresis loop cannot only be controlled b…
The refractive indices, birefringence, and linear electro-optic (EO) effect of 0.62Pb(Mg1∕3Nb2∕3)O3–0.38PbTiO3 single crystals have been characterized as a function of wavelength. The dispersions of refractive indices for both ordinary and extraordinary rays were accurately described by a two-term Sellmeier dispersion…
The composition modulated Sb–Te binary thin films deposited by a RF sputtering method on SiO 2 /Si substrates annealed through a rapid thermal annealing process and conducted a high-resolution transmission electron microscopy (HR-TEM) study in order to investigate the atomic arrangement of the δ-phase Sb–Te binary all…
Severe accidents in PWRs are characterized by a continuously changing geometry of the core due to chemical reactions, melting and mechanical failure of the rods and other structures. These local variations of the porosity and other parameters lead to multi-dimensionnal flows and heat transfers. In this paper, a compre…
Abstract Using Mie theory and a T‐matrix method, we have studied the interaction of light with a micron‐size glass sphere and a dimer of silver nanoparticles in order to assess the feasibility of surface‐enhanced Raman scattering (SERS) that combined dielectric hot spots with plasmon excitation. We show that when ligh…
Abstract The Eindhoven group on emulsion polymerization has contributed to the field of encapsulation of many types of particles like pigments, fillers and clay particles, preparation of hollow multicompartment particles and encapsulation of nanotubes with latex particles. All these developments are very relevant for…
Attenuated total reflection Fourier transform infrared (ATR-FT-IR) spectroscopy has been advantageously used to carry out a simultaneous study of the effect of temperature on sorption, diffusion, swelling rate, and swelling rate factor of ethylene-vinyl alcohol (EVOH) cast films with three different ethylene contents…
Understanding the effect of an external stretching force on the electromechanical response of a strip of free-standing conducting polymer is crucial for developing devices (actuators) based on these polymers. This work deals with the electromechanical characterization of a free-standing polypyrrole strip submitted to…
We obtain evidence that the dynamics of glassy systems below the glass transition is characterized by self-organized criticality. Using molecular-dynamics simulations of a model glass-former we identify clusters of cooperatively jumping particles. We find string-like clusters whose size is power-law-distributed not on…
Abstract Since the mid‐1990s good quality surface‐enhanced Raman spectra have been obtained from many transition metal (TM) electrodes. It has been observed quite often that SERS band intensities, i.e., the relative intensities of different vibrational modes, of the adsorbate are very sensitive to the nature of the me…
A POLYION-1M automated setup for production of nanodimensional coatings by the polyelectrolyte self-assembly method is described. The design, the scheme of connection with a computer, and software of the setup are described. The results of comparison of the parameters of the setup developed and its foreign analog are…
The present study was focused on the investigation of effect of defects on the CNT thermal performance. In order to investigate effect of defects on the material properties of the CNT, MD models were built using the Materials studio software (Accelrys, Inc). In this study, a series of MD models were built to simulate…
In 1994 the first ultrathin Langmuir-Blodgett (LB) ferroelectric films were prepared from ferroelectric vinylidene fluoride and trifluoroethylene copolymer P(VDF-TrFE) [1 Palto, S., Blinov, L., Bune, A., Dubovik, E., Fridkin, V., Petukhova, N., Verkhovskaya, K. and Yudin, S. 1995. Ferroelectric Letters, 19: 65 [CSA][T…