Materials Literature
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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…
Alpha(1)-antitrypsin (AT) is the most abundantly circulating human proteinase inhibitor in the serpin family. The polymerization of AT, leading to alpha(1)-antitrypsin deficiency, has been studied extensively in vitro by a variety of ensemble methods. Here we report the use of fluorescence correlation spectroscopy to…
We present electronic band structure calculations and x-ray emission and photoelectron measurements of the recently discovered van der Waals--type layered superconductors ${\mathrm{Nb}}_{2}{\mathrm{S}}_{2}\mathrm{C}$ and ${\mathrm{Cu}}_{2∕3}{\mathrm{Nb}}_{2}{\mathrm{S}}_{2}\mathrm{C}$. Good agreement between our local…
The effective chemical hardness for some triatomic molecules has been studied using the ‘atom in a molecule’ approach (AIM). Molecular chemical hardness values calculated from the effective chemical hardness of individual atoms agree with experimental and theoretically calculated molecular hardness values. Condensed F…
Silicon carbide (SiC) ceramic with YAG (Y3Al5O12) additive added by sol-gel method was liquid-phase sintered at different sintering temperatures, and the sintering mechanism and microstructural characteristics of resulting silicon carbide ceramics were analyzed by X-ray diffraction (XRD), scanning electron microscopy…
Multiwalled-carbon-nanotube (MWNT)-reinforced polymer surfaces were prepared by infiltration and in situ polymerization of excess monomer into aligned MWNT arrays (see SEM image; scale bar=1 μm). The electrical and mechanical properties of the MWNT-reinforced surface were compared with those of the pure polymer surfac…
The atomic structure and electronic effects of the $[1\overline{1}00]∕(1102)$ twin boundary in $\mathrm{ZnO}$ are studied using the combination of high-resolution $Z$-contrast imaging, first-principles density-functional total-energy calculations, and image simulations. The twin boundary is found to have the head-to-t…
Neutral ruthenium(II) complexes [RuLL'(CN)2] (L, L' = bpy, dmb, dbb; bpy = 2,2'-bipyridine, dmb = 4,4'-dimethyl-2,2'-bipyridine, dbb = 4,4'-tert-butyl-2,2'-bipyridine) were prepared, and the luminescence characteristics of the complexes in the solid state were measured. The luminescence was tuned by crystal waters inc…