Materials Literature
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Spin-cast PEDOT/PSS film are investigated using scanning probe-based spectroscopic techniques. The films are found to consist of relatively well-conducting islands that are embedded in a less conductive matrix. A scanning-tunneling microscope-based method is developed to obtain three-dimensional conductivity images wi…
meso-Pyridine-appended zinc(II) porphyrins Mn and their meso-meso-linked dimers Dn assemble spontaneously, in noncoordinating solvents such as CHCl3, into tetrameric porphyrin squares Sn and porphyrin boxes Bn, respectively. Interestingly, formation of Bn from Dn proceeds via homochiral self-sorting assembly, which ha…
The dispersion law of transverse spin waves known in the Stoner-Hubbard model of itinerant ferromagnetism corresponds to that is well known in more broder and well controlled approach of Fermi-liquid theory. Making use the quantum-field theoretical approach we derive the dispersion law for the transverse spin waves in…
The mechanical stability of open single wall carbon nanotubes (SWCNT) under axial stress (compression and tension) and twist has been re-examined in a search of specific tube-length and load scaling. SWCNT with different chiralities and lengths have been simulated with a classical molecular dynamics method employing t…
Nanoengineered materials have emerged as efficient thermal interface materials in a variety of thermal management applications. For example, integrated circuits (IC) are subject to tight thermal budgets to maintain acceptable reliability standards. This letter presents thermal contact resistance measurement results an…
Experimental and computational studies were performed to investigate the electronic structure of main group oxides containing edge-sharing octahedra. Compounds belonging to four structure types were investigated: rutile (SnO 2, PbO 2 ), trirutile (MgSb 2 O 6, ZnSb 2 O 6, MgBi 2 O 6, ZnBi 2 O 6 ), PbSb 2 O 6 -type (CdS…
One of the most exciting recent developments concerning molecular architectures is the emerging field of crystalline chalcogenide superlattices that bridges two traditional but distinct areas of research: chalcogenide clusters and porous materials. By combining synthetic and structural concepts in these two areas, man…
An electron paramagnetic resonance (EPR) study of ${\mathrm{Nd}}^{3+}$ ions in single crystals of the low-temperature phase of barium metaborate ($\ensuremath{\beta}\text{\ensuremath{-}}\mathrm{Ba}{\mathrm{B}}_{2}{\mathrm{O}}_{4}$ or BBO) is presented. The EPR spectrum shows the existence of various slightly different…
For the measurement of space charges profiles, various experimental techniques are available, the most known being the thermal and the acoustic methods. The methods we use for the determination of the space charges belong to the group of non-destructive thermal methods, called FLIMM (Focused Laser Intensity Modulation…
The macrophase dispersion is thermodynamically favorable if the free energy change due to dispersion (isolation of n particles with radius r, at sufficiently low interfacial energy σ) is negative, i.e., ΔF = n4πr 2σ − TΔS < 0, where ΔS(C) is the entropy gain and C is the concentration. If there is a factor opposing di…
In Na4/3Ln26/3(SiO4)6(F1/3O2/3)2 (Ln = La, Ce, Gd) apatites, synthesized by hydrothermal and ceramic methods, Na+ and Ce3+ cations are disordered on 4f sites while O2- and F- anions are disordered in the “apatite” channels. The high U33 value of these anions suggests the onset of conductivity at high temperature.
Hydrothermal synthesis in the presence of the cationic polyelectrolyte poly(diallydimethylammonium chloride) produces silicalite nanoparticles with uniform shape and size that spontaneously self-assemble into linear chains co-aligned along the crystallographic [010] direction.
Abstract A model of flavor release from encapsulated flavor particles immersed in water has been developed that correlates well with experimental data. Flavor release from particles was determined by measuring both the quantities released from the particle to water and from water to air in the headspace. The model pre…
The electric properties of an air gap between a hemisphere-rod covered with 3 mm thick silicone rubber and plane metal electrode have been examined. Observation of discharge activity and measurement of the discharge current have been made under impulse voltage stress. When applying an impulse voltage close to the ince…
In view of interest in the emulsion polymerization of octamethylcyclosiloxane, (D4), the stability of droplets of monomer D4 against Ostwald ripening was studied and shown to obey the LSW theory at room temperature. The emulsifier was sodium dodecyl benzylsulfonate and the mixture was initially sonicated for a few min…
Dibenzodioxadiselenafulvalene (DBOSF) was prepared and the cis and trans isomers were separated. X-ray crystallographic analysis revealed the presence of Se- - -H and O- - -H hydrogen bonds in both crystals. The electrochemical properties of cis- and trans-DBOSFs together with dibenzotetraoxafulvalene (DBTOF) and cis-…
Bacterial adhesion is an important initiating step of microbial contamination in the paper and board industry. The adhesion process results from interactions between the cell surface, the liquid, and the fibers. In this context, we determined the cellulose pulp surface energy to better understand these interactions. A…
Since a few decades, the pulsed electro acoustic (PEA) method is used for measuring space charge in insulating materials. Through the years, the PEA method has been mainly applied on flat homogeneous dielectrics. However, this technique has been recently used on multi-layer dielectrics as well. In this case, particula…
Behaviors of insulation system are strongly affected by frequency of the system voltages. In addition to power-frequency voltage, the insulation system could be also exposed to a voltage with frequency on the order of kHz due to application of new HV devices. Insulation failures under HF voltages occur not only becaus…
Abstract Polarized Raman and IR spectra were obtained for NaBi(WO 4 ) 2 crystal at ambient temperature. Assignment of the observed bands to the respective internal and external phonons was proposed on the basis of lattice dynamics calculations. The spectra showed also the appearance of additional Raman and IR bands wh…