Materials Literature
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Single-crystalline silver nanobelts larger than 10 μm in length, 60−100 nm in width, and 30−40 nm in thickness were synthesized facilely in aqueous solutions under the direction of poly(acrylic acid) at 4 °C. With the addition of acetic acid to the solution, unique hierarchical silver nanocolumns consisting of stacked…
Abstract Precursor of polyimide, polyamic acid has been prepared sucessfully. Acid‐modified carbon nanotube (MWCNT) was grafted with soluble polyimide then was added to the polyamic acid and heated to 300 °C to form polyimide/carbon nanotube composite via imidation. Morphology, mechanical properties and electrical res…
A comparison study has been conducted on the formation of catalyst nanoparticles on a high surface tension metal and low surface tension oxide for carbon nanotube (CNT) growth via catalytic chemical vapor deposition (CCVD). Silicon dioxide (SiO2) and tantalum have been deposited as supporting layers before deposition…
Raman spectra of ZnO powders and thin films obtained during exposure to hydrogen at different concentrations, temperatures, and electrochemical conditions indicated two distinct effects of hydrogen on the defect structure of the oxide. At lower concentrations of hydrogen in a gaseous environment at approximately 400°C…
CdSe nanocrystals (NCs) were obtained from cadmium sulfate and sodium selenosulfate in aqueous gelatin solutions. A near-bandgap emission of CdSe NCs was noticeably enhanced after passivation with CdS or ZnS. Resonant Raman scattering spectra of the passivated NCs revealed new peaks attributed to the formation of the…
Magnetic and structural characteristics of ErFeO3, TmFeO3, and YbFeO3 single crystals were studied over a wide temperature range. Magnetic measurements found that the spin-rotation transitions in all crystals are well described by the earlier proposed theory with no fitting parameters. Additionally, they have shown th…
The structure and stability of repeat proteins has been little studied in comparison to the properties of the more familiar globular proteins. Here, the structure and stability of designed tetratricopeptide-repeat (TPR) proteins is described. The TPR is a 34-amino-acid motif which adopts a helix-turn-helix structure a…
We report the results of molecular dynamics simulations of melting and premelting of single-walled carbon nanotubes (SWNTs). We found that the traditional critical Lindemann parameter for the melting of bulk crystals is not valid for SWNTs. Using the much smaller critical Lindemann parameter for the melting of nanopar…
A method is proposed to search for topological relations between periodic nets. The method is based on a sequence of steps of decreasing the node degree and symmetry of the initial net (supernet) and, as a result, gives all its subnets. It is implemented into the program package TOPOS which automatically constructs th…
We systematically investigated the structure, electronic properties, zone-center phonon modes, and structure instability of four cubic perovskite $\mathrm{Bi}M{\mathrm{O}}_{3}$ compounds, with three of the $M$ ions being IIIB metals (Al, Ga, and In) and one IIIA transition-metal Sc, using first-principles density-func…
Systematic generation of face-transitive tilings by size of Delaney-Dress symbol has recovered by dualization all the edge-transitive nets previously described and has led to the discovery of six new binodal edge-transitive nets which are described and illustrated.
Cylinder-forming polystyrene- block -poly(methyl methacrylate) (PS- b -PMMA) thin films were directed to assemble on chemically nanopatterned surfaces consisting of a square array of spots with varying diameters of lattice spacing and spot size. In all cases the patterned spots were preferentially wet by the PMMA bloc…
We report on the first, to the best of our knowledge, studies of photorefraction in nematic liquid crystal (LC) doped with nanoferroelectric particles. We found the strong enhancement of two-beam coupling in the colloid of ferroelectric nanoparticles in LC. The effect originated from an increased birefringence of the…
Raman scattering is used to investigate the room temperature phonons of tetragonal (I4∕m) Sr2CoWO6 and monoclinic (P21∕n) Ca2CoWO6, Sr2CoTeO6, and Ca2CoTeO6 double perovskites. Both tetragonal and monoclinic structures result from small distortions of the Fm3¯m cubic lattice. Therefore, phonons were assigned according…
Coupled electron spins in semiconductor double quantum dots hold promise as the basis for solid-state qubits. To date, most experiments have used III-V materials, in which coherence is limited by hyperfine interactions. Ge/Si heterostructure nanowires seem ideally suited to overcome this limitation: the predominance o…
While measurements of the polar dependence of the surface free energy are easily available, measurements of the whole polar dependence of the surface stress of a crystal do not exist. In this paper is presented a new procedure that allows, for the first time, the experimental determination of the surface stress polar…
A simple and general method for the preparation of ultrathin, large-area, free-standing films of nanofibrous composite materials was developed. First, positively charged cadmium hydroxide nanostrands of 1.9 nm in diameter and micrometers in length were prepared by mixing dilute aqueous solutions of cadmium chloride an…
The uptake of carbon dioxide was studied in porous organic solid, p-tert-butylcalix[4]dihydroquinone, in which all calixarenes are self-assembled in a tubular fashion via strong hydrogen bonds. the BET surface area of porous material was found to be 230 m2/g. This represents another rare example in which purely organi…
This paper investigates faceting mechanisms induced by electromigration in the regime where atomic steps are transparent. For this purpose we study several vicinal orientations by means of in-situ (optical diffraction, electronic microscopy) as well as ex-situ (AFM, microprofilometry) visualization techniques. The dat…
Under hydrothermal conditions, we have prepared boehmite (γ-AlOOH) with two distinct nanostructures—2D nanoplatelets and 1D nanowires (or nanowire bundles)—simply by manipulating the acidity of the reaction solution without adding any templates or seeds. The 2D nanoplatelets with a thickness of ~20 nm and the 1D nanow…