Materials Literature
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We report the realization and characterization of independently controllable, fabricated tunnel barriers within a carbon nanotube. The nanotubes are mechanically bent or kinked using an atomic force microscope, and top gates are subsequently placed near each kink. Transport measurements indicate that the kinks form ga…
The chemistry of acetone on the oxidized and reduced surfaces of TiO 2 (110) was examined using temperature-programmed desorption (TPD) and high-resolution electron energy-loss spectroscopy (HREELS). The reduced surface was prepared with about 7% oxygen vacancy sites by annealing in ultrahigh vacuum (UHV) at 850 K, an…
We have studied how different growth conditions, namely, oxygen flow rate, annealing temperature and annealing time affect the diameter, aspect ratio and number density of CuO nanorods using scanning and transmission electron microscopy. CuO nanorods are synthesized by thermal annealing of thin copper foil. It is obse…
The compound Dy7Rh3 ordering antiferromagnetically below (TN=) 59 K has been known to exhibit a temperature (T) dependent electrical resistivity (rho) behavior in the paramagnetic state unusual for intermetallic compounds in the sense that there is a broad peak in rho(T) in the paramagnetic state (around 130 K) as tho…
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-…