Materials Literature
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Our measurements of the surface tension of charge‐stabilized TiO2 and SiO2 dispersions show that the surface tension of the dispersions is a function of the particle concentration. At lower concentrations, the adsorption of particles to the interface decreases the total free energy of the system which causes a decreas…
The structural characterization of a hydrogen-covered diamond(001) surface has been investigated by density-functional theory with the plane-wave pseudopotential method and the generalized gradient approximation. Structures with different hydrogen coverage, from one to two monolayers, are considered. The formation ene…
This study investigated the effect of cationic, anionic (saturated and unsaturated), and nonionic surfactants on the formation, morphology, and surface properties of silica nanoparticles synthesized by the ammonium‐catalyzed hydrolysis of tetraethoxysilane in alcoholic media. Results indicate that at a relatively low…
We report the results of crystallographic analysis of various complex heterophase states that occur around the morphotropic phase boundary in the relaxor-based $(1\ensuremath{-}x)\mathrm{Pb}({\mathrm{Mg}}_{1∕3}{\mathrm{Nb}}_{2∕3}){\mathrm{O}}_{3}\text{\ensuremath{-}}x{\mathrm{PbTiO}}_{3}$ solid solutions at room tempe…
Hybrid polymer−semiconductor nanostructured films were obtained by co-electrodeposition of poly(vinyl acetate- co -crotonic acid) and CdS or CdTe nanoparticles (NPs) stabilized with 1-thioglycerol (TGL) or thioglycolic acid (TGA). Composite films were enriched with negatively charged NPs stabilized with TGA. Relative…
The author employs density functional theory to study colloidal interactions in solution. Hardcore Yukawa potentials with soft tails, either repulsive or attractive, are used to model colloid-solvent and solvent-solvent interactions. We analyze the effect of these interactions on the solvent-mediated potential of mean…
Polycrystalline Sr 2 FeMoO 6 samples are synthesized by an encapsulation technique under very low oxygen partial pressures utilizing the Fe/FeO redox couple as an oxygen getter. A route based on thermal decomposition of metal complexes, using ethylenediaminetetraacetic acid as the complexant, is developed to prepare a…
Oxygen-deficient h-BaTiO3 synthesized by noncontact processing exhibits a dielectric constant higher than 100 000 with a loss component of about 0.1 together with a weak temperature dependence in the range of 100 to 300 K. Dielectric constant dramatically dropped by 2 orders of magnitude below 70 K.
Thermal conductivity of a $(10,10)$ carbon nanotube filled with ${\mathrm{C}}_{60}$ fullerenes (or a peapod) is computed using direct molecular-dynamics simulations with the Tersoff-Brenner potential for $\mathrm{C}\text{\ensuremath{-}}\mathrm{C}$ bonding interactions and the van der Waals potential for nonbonding int…
High-quality epitaxial films of layered cobaltite Na 0.83 CoO 2 were successfully grown on (0001)-oriented α-Al 2 O 3 substrate by reactive solid-phase epitaxy using CoO epitaxial layer and NaHCO 3 powder. First, the thermal oxidation of the CoO film into Co 3 O 4 occurs at a lower temperature (300−500 °C), then a Na…
We report the novel synthesis method of iron nanoparticles that can easily control both position and diameter significantly smaller than the lithography limit, and also demonstrate diameter- and position-controlled carbon nanotube (CNT) growth from the nanoparticles. We patterned iron particles having a 1.7 ±0.6 nm di…
Abstract Real‐time Fourier transform infrared spectroscopy was used to investigate the crystalline transition of even–even polyamide‐10,20. During the crystalline transition, the intensity of the hydrogen bonds became weak, the twisting of the CCO and CN bonds improved, and the gauche conformation of the CH 2 sequen…
Escherichia coli NeuNAc (N-acetylneuraminic acid) synthase catalyses the condensation of PEP (phosphoenolpyruvate) and ManNAc (N-acetylmannosamine) to form NeuNAc and is encoded by the neuB gene. Campylobacter jejuni has three neuB genes, one of which is very similar to the E. coli neuB gene. We have characterized the…
Abstract Fully exfoliated layered silicate epoxy nanocomposites are reported in this article. The processing route that resulted in these fully exfoliated layered silicate epoxies is based on a combination of high‐shear mixing in the presence of acetone and ultrasonication. Homomogeneous and random dispersion of the i…
The synthesis and mesomorphic properties of a number of compounds belonging to different homologous series and derived from 2,7-dihydroxynaphthalene are described. In addition, several compounds derived from 1,3-dihydroxybenzene have also been synthesized for comparison. All these compounds are relatively stable ester…
Utilizing the unique features of photochromic compounds to control aggregation enables the generation of photoresponsive gels. Self-assembly mediated by hydrogen bonding in open and closed dithienylcyclopentene photoswitches carrying chiral amide moieties can be used to reversibly transcribe molecular into supramolecu…
We have used anomalous small-angle X-ray scattering (ASAXS) to investigate the spatial correlation of counterions with a macroion consisting of polyelectrolyte brushes. The spherical polyelectrolyte brush is composed of a solid poly(styrene) core of 68 nm radius with a dense grafting of linear poly(acrylic acid) chain…
The special branch: Tetrapod-branched ZnSe nanorod architectures have been synthesized via a simple Sn-catalyzed thermal evaporation process. Each branch within these architectures has a hexagon-like cross section and well- defined crystallographic facets, thus forming a regular hexagonal prismatic structure. The leng…
A micro tool for evaluating thermoelectric properties of low-dimensional materials is developed. It is expected that a one-dimensional thermoelectric material exhibits superior thermoelectric properties and low thermal conductivity due to its inherent nanoscale structure. By using these superior properties, high effic…
The effect of disorder on the critical properties of the ferromagnetic phase transition in colossal magnetoresistive manganite ${\mathrm{La}}_{0.67}{\mathrm{Ca}}_{0.33}{\mathrm{MnO}}_{3}$ has been studied by substituting $\mathrm{Ga}$ for $\mathrm{Mn}$. It is found that, upon 10% $\mathrm{Ga}$ substitution, the peak i…