Materials Literature
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Stable porphyrin/single-walled nanotube (SWNT) composites were synthesized by condensation of tetraformylporphyrins and diaminopyrenes on SWNTs. The degree of interaction between SWNTs and porphyrin was evaluated by UV−vis and fluorescence spectra, and chemical removal of porphyrin from SWNTs. In the composites, the S…
We consider dislocations in the framework of Eringen's nonlocal elasticity. The fundamental field equations of nonlocal elasticity are presented. Using these equations, the nonlocal force stresses of a straight screw and a straight edge dislocation are given. By the help of these nonlocal stresses, we are able to calc…
Temperature-dependent radiative recombination of free excitons involving one or two LO phonons in GaN is investigated in detail. It is found that both phonon sidebands possess asymmetric lineshape and their energy spacings from the zero phonon line strongly deviate from the characteristic energy of LO phonons as the t…
We report a photoluminescence observation of robust excitonic polarons due to strong coupling of exciton and longitudinal optical (LO) phonon as well as Fano-type interference in high quality ZnO crystal. At low enough temperatures, the strong coupling of excitons and LO phonons leads to not only traditional Stokes li…
Solid solutions of nominal composition [ZnGa 2 O 4 ] 1− x [Fe 3 O 4 ] x , of the semiconducting spinel ZnGa 2 O 4 with the ferrimagnetic spinel Fe 3 O 4 , have been prepared with x = 0.05, 0.10, and 0.15. All samples show evidence for long range magnetic ordering with ferromagnetic hysteresis at low temperatures. The…
Structural characteristics of nanosized ceria-silica, ceria-titania, and ceria-zirconia mixed oxide catalysts have been investigated using X-ray diffraction (XRD), Raman spectroscopy, BET surface area, thermogravimetry, and high-resolution transmission electron microscopy (HREM). The effect of support oxides on the cr…
Measuring, characterizing, and modelling the slow dynamics of glassy soft matter is a great challenge, with an impact that ranges from industrial applications to fundamental issues in modern statistical physics, such as the glass transition and the description of out-of-equilibrium systems. Although our understanding…
The electrochemical performance of supercapacitors made of a carbon material with a moderate amount of nitrogen atoms embedded in a carbon matrix is reported. Melamine was polymerized in the interlayer spaces of mica and afterward carbonized at various temperatures between 650 and 1000 °C. Elemental analysis and an XP…
Silver(I)-imidazole cyclophane gem-diol complex, 3 [Ag2C36 N10(O)4](2+)2(x)-, where x = OH- or CO3(2-), was synthesized and well characterized. The minimum inhibition concentration tests showed that the aqueous form of 3 is 2 times less effective as an antibiotic than 0.5% AgNO3, with about the same amount of silver.…
One of the most fundamental tasks in nanoscience is the accurate determination of particle sizes. Various methods have been developed to elucidate the mean particle diameter and the standard deviation for an ensemble of nanocrystals. However, good agreement between the results from different methods is not always enco…
Multi-walled carbon nanotubes with controllable structures are produced at a low temperature (175 °C) by using CCl4 as the precursor for pyrolytic growth in a supercritical carbon dioxide medium, in the presence of iron catalysts encapsulated in polypropyleneimine dendrimers (see picture). This work may lead to a larg…
Single crystals of the nonlinear optical (NLO) material TmAl 3 (BO 3 ) 4, space group R 32, were grown successfully by the top seeded solution growth (TSSG) method for the first time in our laboratory. Morphology analysis reveals that the crystal is a rhombohedron with nine developed faces with the major forms (12̄10)…
A hybrid rheological approach utilizing thermal analysis, microscopy, and oscillatory viscoelastic measurements is presented here for estimating the interfacial tension, γ 12, of a partially miscible polymer mixture. The mixed composition of each of the bulk phases affects its complex modulus and T g, along with γ 12…
We have investigated the influence of the steric properties of conducting particles in a nonconducting host matrix on the conductivity threshold of the material, i.e., the minimum volume fraction of conducting phase for the whole sample to become conducting. A statistical, numerical method is used in which the particl…
New aliphatic polyester-type dendrimers were synthesized using a new AB2-type building block 3, prepared from benzyl acetoacetate and 2 equiv of tert-butyl acrylate by acetoacetic acid ester synthesis. The reiterative [deprotection by HCO2H, then EDCI/DMAP coupling] sequence using divergent growth method gave [G1]-4tB…
A conventional scanning electron microscope equipped with a LaB6 source has been modified to operate in a scanning transmission mode. Two detection strategies have been considered, one based on the direct collection of transmitted electrons, the other on the collection of secondary electrons resulting from the convers…
Fully enclosed horizontal nanochannels, in a prearranged array on a substrate and with built-in electrical contacts and chemical access regions, were used as growth templates for electrochemical synthesis of conducting polymer nanoribbons. In this "grow-in-place" approach, the nanochannel templates are part of the fin…
The origin of ferromagnetism in cobalt-doped anatase $\mathrm{Ti}{\mathrm{O}}_{2}$ (Co:$\mathrm{Ti}{\mathrm{O}}_{2}$) has been quite controversial due to the possible formation of Co nanoparticles. Recently, Shinde et al. claimed that high-temperature postannealing (i.e., at 900 \ifmmode^\circ\else\textdegree\fi{}C) s…
The density functional computations of MMP are performed at B3LYP/6-31G (d,p) level to derive equilibrium geometry, vibrational wavenumbers and intensities, and first hyperpolarizability. Large NLO efficiency predicted for the first time in this new class of compounds has been confirmed by powder efficiency experiment…
We report here a novel, time-resolved, lanthanide-based energy-transfer assay utilizing nonoverlapping acceptor fluorophores, which have their absorption energetically at a higher level than the emittive transitions of the donor. The technique was studied by comparing a series of nonoverlapping acceptors in a homogene…