Materials Literature
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Zigzag graphene nanoribbons with saturated edges are investigated by first principles calculations. In these structures edge carbons have either two H or two F atoms, and are of sp(3) type. Compared to the previously studied ribbons with all carbons of sp(2) type, several similarities and differences are found. Specif…
The effect of side chain to charge ratio on the frictional properties of adsorbed layers formed by bottle-brush polyelectrolytes with poly(ethylene oxide) side chains has been investigated. The brush polyelectrolytes were preadsorbed from 0.1 mM NaNO(3) solutions onto mica and silica surfaces; the interfacial friction…
Single-phase bimetallic AuPt nanoparticles with controlled composition in single particles can be prepared by the coreduction method in DMF. The prepared AuPt particles show a narrow size distribution from 3.0 to 4.8 nm (see picture).
The crystal structure, lattice dynamics, and local metal-hydrogen bonding of the perovskite hydride NaMgH 3 were investigated using combined neutron powder diffraction, neutron vibrational spectroscopy, and first-principles calculations. NaMgH 3 crystallizes in the orthorhombic GdFeO 3 -type perovskite structure ( Pnm…
Polyethyleneimine (PEI) and Microfibrillated cellulose (MFC) have been used to buildup polyelectrolyte multilayers (PEM) on silicone oxide and silicone oxynitride surfaces at different pH values and with different electrolyte and polyelectrolyte/colloid concentrations of the components. Consecutive adsorption on these…
In this paper, we fabricate ZnO nanofibers and nanoparticles through electrospinning precursor solution zinc acetate(ZnAc)/cellulose acetate(CA) in mixed‐solvent N , N ‐dimethylformamide/acetone. Depending on the posttreatment of precursor ZnAc/CA composite nanofibers, both ZnO nanofibers and nanoparticles were synthe…
Using a peptide amphiphile having a bulky photolabile 2-nitrobenzyl group between the alkyl chain and the peptide segment, we demonstrated quadruple helical fiber formation and its dissociation into single fibrils in response to light. Putting the bulky group close to the core of a fibril is thought to induce a distor…
Thermophysical properties were investigated for zirconium diboride (ZrB 2 ) and ZrB 2 –30 vol% silicon carbide (SiC) ceramics. Thermal conductivities were calculated from measured thermal diffusivities, heat capacities, and densities. The thermal conductivity of ZrB 2 increased from 56 W (m K) −1 at room temperature t…
An analysis of squareness in demagnetization curve of Nd–Fe–B fine-grained alloys prepared by the hydrogenation-disproportionation-desorption-recombination (HDDR) process was carried out in reference to the melt-spun and sintered magnets by measurements of their recoil curves. The recoil curves of the HDDR magnet and…
The interfacial interaction strength and transition properties in a reverse selective thin film nanocomposite system, silica-poly[(trimethylsilyl)propyne] (SiO(x)-PTMSP), are investigated locally by heated tip atomic force microscopy. SiO(x)-PTMSP has recently been introduced as a new class of reverse selective membra…
Systematic investigations were performed concerning the crystal structure and excitonic-related transitions of Zn1−xCoxO layers. The substitution of Co atoms for Zn sites was initially identified from the intra-emissions originating from the 3d levels of the Co2+ ions. Microresonant Raman scattering (μ-RRS) revealed t…
Dilute frozen solutions of the single molecule magnet Ni(4) (S=4) have been studied using 130 GHz electron paramagnetic resonance (EPR). Despite the random orientation of the molecules, well defined EPR absorption peaks are observed due to the strong variation of the splittings between the different spin states on mag…
Structure and magnetic properties of both melt-spun and hot deformed bulk Sm–Co type nanocomposite magnets have been investigated with various metal additions, including Zr, Cu, and Nb. The Zr and Nb additions play important roles in constraining grain growth, resulting in an increase of coercivity Hc. The Cu addition…
Abstract Organophilic montmorillonite was prepared using ion‐exchange method between sodium ions in clay layers and four kind of quaternary ammonium salt. The montmorillonite has the largest d 001 ‐spacing, as determined by X‐ray diffraction in modified by di(hydrogenated tallowalkyl) dimethyl ammonium chloride. Polys…
The Nd49Al13Ni38 amorphous alloy has been prepared by melt-spinning in the form of ribbons. Its magnetic properties have been investigated via superconducting quantum interference device magnetometry and its magnetic phase diagram was established. Hysteresis and temperature-dependent magnetization measurements show th…
Coprecipitation of urea-melt modified carbon nanotubes and calcium carbonate from an aqueous solution by two methods yielded microcrystalline composite particles. Powders obtained by colloidal crystallization from a supersaturated solution that were isolated and dried soon after precipitation were a mixture of raspber…
The low temperature antiferromagnetic-antiferromagnetic phase transition in polycrystalline ${\mathrm{YBaCo}}_{2}{\mathrm{O}}_{5.5}$ cobaltite was studied by neutron powder diffraction. On the basis of symmetry arguments in combination with Rietveld refinement, the coexistence of two phases with different type of spin…
Contrast variation small-angle neutron scattering (SANS) has been employed to study complex fluids comprising model microemulsions and polymers. The systems are water-in-oil microemulsions with added non-adsorbing polymer, under good polymer solvency conditions and semidilute polymer concentrations. The polymer/colloi…
We studied the electronic structure of the ${\mathrm{V}}_{2}{\mathrm{O}}_{5}$ compound using cluster model calculations. The calculation included the reduced ${\mathrm{V}}^{5+}$ symmetry and the strong $\mathrm{V}\phantom{\rule{0.2em}{0ex}}3d--\mathrm{O}\phantom{\rule{0.2em}{0ex}}2p$ covalence effects. The many-body e…
Electrical resistivity, dc magnetization, ac susceptibility, thermopower, and magnetoresistance measurements have been carried out on Ni-substituted $\mathrm{Gd}\mathrm{Ba}{\mathrm{Co}}_{2}{\mathrm{O}}_{5+\ensuremath{\delta}}$. Structural characterization of the samples was done by x-ray diffraction and results show a…