Materials Literature
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Electron paramagnetic resonance of single-walled carbon nanotubes (SWCNTs) has been bedevilled by the presence of paramagnetic impurities. To address this, SWCNTs produced by laser ablation with a nonmagnetic PtRhRe catalyst were purified through a multiple step centrifugation process in order to remove amorphous carb…
LiYP(4)O(12) polyphosphate doped with Ce(3+) ions was prepared by the melt solution technique. The crystal structure, interatomic distances, and atom coordination numbers were determined using x-ray powder diffraction. A study of the spectral-kinetic luminescent properties was performed employing excitation with pulse…
Porous and hollow particles are widely used in pharmaceuticals, as solid phases for chromatography, as catalyst supports, in bioanalytical assays and medical diagnostics, and in many other applications. By controlling size, shape, and chemistry, it is possible to tune the physical and chemical properties of the partic…
We present a study of ultrafast carrier transfer from highly luminescent states inside the core of silicon nanocrystal (due to quasidirect transitions) to states on the nanocrystal-matrix interface. This transfer leads to a sub-picosecond luminescence decay, which is followed by a slower decay component induced by car…
We have characterized the self-association of FtsZ in its GDP-bound state (GDP-FtsZ) and the heteroassociation of FtsZ and a soluble recombinant ZipA (sZipA) lacking the N-terminal transmembrane domain by means of composition gradient-static light scattering (CG-SLS) and by measurement of sedimentation equilibrium. CG…
The potential shape memory alloy Ni(50)Mn(34)In(16) is studied with partial substitution of Mn with Fe and Cr to investigate the effect of such substitution on the martensitic transition in the Ni-Mn-In alloy system. The results of ac susceptibility, magnetization and electrical resistivity measurements show that whil…
Dextrans have long been used in detection and medicine, because of their low toxicity and excellent biocompatibility. Methods for attaching them to a diverse range of recognition and therapeutic molecules have been developed over many years. These properties make them ideal as coating agents for nanoparticles with app…
We present data on the magnetic and magnetoelastic coupling in the hexagonal multiferroic manganite ${\text{LuMnO}}_{3}$ from inelastic neutron scattering, magnetization, and thermal-expansion measurements. We measured the magnon dispersion along the main symmetry directions and used this data to determine the princip…
Azalomycin F(4a) 2-ethylpentyl ester (1) and Azalomycin F(5a) 2-ethylpentyl ester (2), two new macrocyclic lactones, along with three known compounds of Azalomycins F(3a) (3), F(4a) (4) and F(5a) (5), were identified from metabolites of Streptomyces sp. 211726 isolated from mangrove rhizosphere soil. The complete (1)H…
The light-induced insulator-to-metal phase transition was investigated by femtosecond pump-probe techniques in nanocrystalline ${\text{VO}}_{2}$ films. The size of ${\text{VO}}_{2}$ nanoparticles and the ${\text{VO}}_{2}$ film morphology were found to be critical for the ultrafast light-induced phase-transition dynami…
A variety of N-fused porphyrin derivatives were prepared and their photophysical properties were investigated. Although intact N-fused tetraarylporphyrins showed almost no emission, introduction of electron-withdrawing groups such as a nitro group and a cyano group on the macrocycles caused significant refinements in…
The Verwey transition in magnetite (Fe 3 O 4 ) has been studied extensively with a wide assortment of experimental techniques to investigate the effects of impurities, oxygen stoichiometry, and crystal quality; however, no studies have tested the effects of crystal size on the Verwey transition. In this study, the hea…
A new technique for the measurement of dielectric constants of nematic liquid-crystal (LC) materials at millimeter-wave frequencies is presented. The proposed method utilizes an electric field to align the LC molecules, therefore offering safety and enormous size reduction over the method using the magnetic field to a…
We present a quantitative design methodology for optimizing insulator gap width, gap resistivity, and collector to needle height for the alignment of sub-100 nm electrospun nanofibers at insulator gaps of metal collectors. Enhancement of the spatial extent of alignment forces at insulator gaps, due to the concerted ac…
Posterior cingulate/retrosplenial cortex (PCC) hypometabolism is a common feature in amnestic mild cognitive impairment and Alzheimer's disease. In rats, PCC hypometabolism induced by mitochondrial dysfunction induces oxidative damage, neurodegeneration and memory deficits. USP methylene blue (MB) is a diaminophenothi…
The mechanisms involved in the thermal reduction of graphite oxide (GO) are not yet clear. In the present study, the thermal reduction of GO, obtained by a Brodie-based method, is monitored by means of time- and temperature-resolved X-ray diffraction (XRD), thermogravimetric analysis (TGA), and TGA/mass spectrometry (…
Size does matter: The nonporous tetra-n-butylammonium salt of silicodecatungstate, synthesized through a bottom-up approach, heterogeneously catalyzes the size-selective oxidation of various organic compounds, including olefins, sulfides, and organosilanes, with aqueous H2O2 in ethyl acetate. The catalyst can be easil…
We report surprisingly soft covalent bond-deformation paths in recently discovered superhard γ-boron. First-principles calculations reveal an intriguing mechanism for bond transformation mediated by three-center bonding, which reduces considerably the rigidity and directionality of the two-center covalent bonds in γ-b…
Poly(2-(dimethylamino)ethyl methacrylate) (PDMAEMA) was synthesized and subsequently neutralized with various acids to form PDMAEMA·HCl, PDMAEMA·HBF 4, and PDMAEMA·HOTf polyelectrolytes. In addition, ion exchange of the chloride anion provided polyelectrolytes with NO 3 −, N(CN) 2 −, PF 6 −, and Tf 2 N − anions. The g…
Synchrotron x-ray diffraction and high-resolution electron microscopy revealed the origin of different strain hardening behaviors (and dissimilar tensile ductility) in nanocrystalline Ni and nanocrystalline Co. Planar defect accumulations and texture evolution were observed in Co but not in Ni, suggesting that interfa…