Materials Literature
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The structural and functional properties of ultrathin (<5 nm) poly(aniline) (PANI) films deposited on indium-tin oxide (ITO) have been investigated using electrochemical and attenuated total reflection (ATR) spectroscopy methods. Layer-by-layer (LbL) self-assembly was used to form films composed of one and two bilayer…
We investigate the pressure dependence of the optical properties of CeTe3, which exhibits an incommensurate charge-density-wave (CDW) state already at 300 K. Our data are collected in the midinfrared spectral range at room temperature and at pressures between 0 and 9 GPa. The energy for the single particle excitation…
This paper reports the inhibition efficiency of combinations of amine-terminated polyaminoamide (PAMAM) dendrimers of generation 1 and 2 and anionic polyelectrolytes in colloidal silica particle growth. The polyelectrolytes studied were PAA = polyacrylate (low MW is 2 KDa, high MW is 450 KDa), PAM- co -AA = poly(acryl…
We calculate the density of states of electron-hole excitations in a superconductor--normal-metal--superconductor (SNS) junction in graphene, in the long-junction regime that the superconducting gap ${\ensuremath{\Delta}}_{0}$ is much larger than the Thouless energy ${E}_{T}=\ensuremath{\hbar}v∕d$ (with $v$ the carrie…
We report chemical deposition of metal particles and clusters with various sizes and morphologies on top of the polyaniline (PANI) thin films and porous asymmetry membranes. Immersing the PANI membrane into the PtCl 4 2- gives rise to 3−5 nm Pt nanoparticles spread evenly on the membrane surface, while immersing undop…
The regeneration kinetics of cellulose from cellulose--NaOH--water gels immersed in a nonsolvent bath is studied in detail. Cellulose concentration, bath type, and temperature were varied, and diffusion coefficients were determined. The results were compared with data measured and taken from the literature on the rege…
High-precision powder x-ray diffraction and $^{57}\mathrm{Fe}$ M\"ossbauer studies up to $20\phantom{\rule{0.3em}{0ex}}\mathrm{GPa}$ show that magnetite $({\mathrm{Fe}}_{3}{\mathrm{O}}_{4})$ undergoes a reversible normal$\ensuremath{\leftrightarrow}$inverse transition with increasing pressure or decreasing temperature…
Synthesis of a tetrakis(1-pyrenylethynyl)-substituted rigid hinge-like molecule (1) is described. The intramolecular pi-stacking interaction of the pyrene units is studied by 1H NMR and fluorescence spectroscopy. Due to intramolecular pi-stacking interactions, chemical shifts of the pyrene protons in 1 are highly shie…
Pulsed-laser deposition was employed to grow epitaxial thin films of the oxynitride perovskite BaTaO 2 N on a conducting SrRuO 3 buffer layer deposited on a 100-cut SrTiO 3 single-crystal substrate. Phase purity and epitaxy were optimized at a substrate temperature of 760 °C in a mixed gas atmosphere of 100 mTorr N 2…
Abstract Heteroepitaxial ZnO films are successfully grown on nondoped GaN‐buffered Al 2 O 3 (0001) substrates in water at 90 °C using a two‐step process. In the first step, a discontinuous ZnO thin film (ca. 200 nm in thickness) consisting of hexagonal ZnO crystallites is grown in a solution containing Zn(NO 3 )·6 H 2…
Contrary to ordinary solids, which are normally known to harden by compression, the compressibility of $\mathrm{Si}{\mathrm{O}}_{2}$ (silica) glass has a maximum at about $2--4\phantom{\rule{0.3em}{0ex}}\mathrm{GPa}$ and its mechanical strength shows a minimum around $10\phantom{\rule{0.3em}{0ex}}\mathrm{GPa}$. At thi…
During the potentiodynamic preparation of conducting polymers, cyclic voltammograms of many pi-conjugated monomers and oligomers often show a marked crossing or loop effect. The so-called "nucleation loop" of the first cycle has been ascribed to the nucleation process requiring an activation energy provided by an over…
A tight-binding parametrization for silicon, optimized to correctly reproduce effective masses as well as the reciprocal space positions of the conduction-band minima, is presented. The reliability of the proposed parametrization is assessed by performing systematic comparisons between the descriptions of donor impuri…
In this letter we report observation of room temperature ferromagnetism in bulk Ga$_2$O$_3$ . We also observe large (10-60%) increase/decrease in photoluminescence. In the red(700 nm wavelength)/blue(500 nm), with the application of small magnetic field(0.4 Tesla). We argue, that ferromagnetism occurs entirely due to…
To justify the origin of anomalous Hall effect (AHE), it is highly desirable to have the system parameters tuned continuously. By quantitative calculations, we show that the doping dependent sign reversal in CuCr$_{2}$Se$_{4-x}$Br$_{x}$, observed but not understood, is nothing but direct evidence for the Berry-Phase m…
We have studied the exciton properties of single-wall carbon nanotubes by solving the Bethe-Salpeter equation within tight-binding models. The screening effect of the $\ensuremath{\pi}$ electrons in carbon nanotubes is treated within the random phase and static screened approximations. The exciton wave functions along…
We develop a theory of collective mode dynamics in the helical magnets coupled to electric polarization via spin-orbit interaction. The low-lying modes associated with the ferroelectricity are not the transverse optical phonons, but are the spin waves hybridized with the electric polarization. This hybridization leads…
We report the characterization by Raman spectroscopy of rutile nanocrystals embedded in cluster-assembled $\mathrm{Ti}{\mathrm{O}}_{2}$ films produced by supersonic cluster beam deposition. Thermal annealing of the as-deposited films promotes the growth of rutile and anatase nanoparticles with a dimension distribution…
The present study is concerned with the nanocasting preparation of Co 3 O 4 nanostructures employing two-dimensional (2D) hexagonal SBA-15 and three-dimensional (3D) cubic KIT-6 as hard templates. The influence of framework connectivity of the parent silica and loading of the cobalt source are studied in detail. Struc…
We report the evaluation of cytotoxicity of a new type of engineered nanomaterials, FePt@CoS(2) yolk-shell nanocrystals, synthesized by the mechanism of the Kirkendall effect when FePt nanoparticles serve as the seeds. The cytotoxicity of FePt@CoS(2) yolk-shell nanocrystals, evaluated by MTT assay, shows a much lower…