Materials Literature
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This study presents a new innovative method where electrospinning is used to coat single microfibers with nanofibers. The nanofiber-coated microfibers can be formed into scaffolds with the combined benefits of tailored porosity for cellular infiltration and nanostructured surface morphology for cell growth. The nanofi…
This paper investigates the stability and nonfouling properties of poly(poly(ethylene glycol) methacrylate) (PPEGMA) brushes prepared by surface-initiated atom transfer radical polymerization from SiO(x) substrates modified with a trimethoxysilane-based ATRP initiator. At high chain densities, PPEGMA brushes were foun…
To obtain one biodegradable and electroactive polymer as the scaffold for tissue engineering, the multiblock copolymer PLAAP was designed and synthesized with the condensation polymerization of hydroxyl-capped poly( l-lactide) (PLA) and carboxyl-capped aniline pentamer (AP). The PLAAP copolymer exhibited excellent ele…
The feasibility of reinforcing conventional carbon fiber composites by grafting carbon nanotubes (CNTs) onto the fiber surface has been investigated. Carbon nanotubes were grown on carbon fibers using the chemical vapor deposition (CVD) method. Iron was selected as the catalyst and predeposited using the incipient wet…
Processable, single-layered graphene oxide (GO) is an intriguing nanomaterial with tremendous potential for electronic applications. We spin-coated GO thin-films on quartz and characterized their sheet resistance and optical transparency using different reduction treatments. A thermal graphitization procedure was most…
Abstract - This model for voltage V vs. current density i characteristics applies both to the Solid Oxide Fuel Cell (SOFC) and Solid Oxide Electrolysis Cell (SOEC) modes of operation. It is based on reaction rates calculated from a molecular-scale model for the physical and chemical processes involved. An expression i…
We report here the first observation of a pyroelectric effect in a nonpolar semiconductor. This effect originates in the temperature-dependent electric dipole of the PbTe p-n junction. The junction was illuminated by a chopped CO(2) laser beam, and periodic and single-pulse pyroelectric signals were observed and measu…
Impregnation technique has been used to load Ni on to a preformed porous anode matrix. Button cells with YSZ electrolyte and porous anode matrix (YSZ) have been fabricated by tape casting technique. Performance curves for a cell with 4.25 volume % Ni-YSZ anode, showed that power density increased with temperature and…
When an alloy is irradiated, atomic transport can occur through the two types of defects which are created: vacancies and interstitials. Recent developments of the self-consistent mean field (SCMF) kinetic theory could treat within the same formalism diffusion due to vacancies and interstitials in a multi-component al…
Cuprous oxide (Cu2O) is generally a p-type semiconductor material due to the Cu ion vacancies exist in the crystal lattice. The technique of electrodeposition provides the possibility of depositing Cu2O thin films resulting n-type photoresponses in solar cell devices. By maintaining pH values of the depositing aqueous…
DC magnetic susceptibility measurements on CsYbZnSe 3 show a broad magnetic transition at approximately 10 K and pronounced differences between zero-field-cooled and field-cooled data that lead to experimental effective magnetic moments of 4.26(5) BM and 4.39(4) BM, respectively. Specific heat measurements confirm tha…
Inverse magnetic susceptibility χ −1 has been measured as a function of temperature for five alloys in the series (Fe 1− x Co x ) 2 P. Short range magnetic order above the Curie temperature in the studied alloys was observed. Paramagnetic moments have been obtained using χ −1 – T curves. These are much larger than sat…
High-quality epitaxial films of Li 0.93 CoO 2 were successfully grown on the (0001)-face of α-Al 2 O 3 substrates via the topotactic ion exchange of Na 0.8 CoO 2 epitaxial films. The average x -value of the Li x CoO 2 films was controlled from 0.60 to 0.93 by immersing in a K 2 S 2 O 8 aqueous solution. The metal ( x…
Preferential adsorption of poly(2-vinylpyridine)−deuterated polystyrene−poly(2-vinylpyridine) (PVP−dPS−PVP) triblock copolymers from toluene onto silicon leads to the formation of dPS loops tethered by the PVP end blocks. Using neutron reflectometry, we have determined the segment density profiles of these looped poly…
We review recent results obtained by Molecular Dynamics (MD) simulations on the elementary interaction mechanisms between dislocations and irradiation defects, with the aim to obtain a fundamental understanding of plasticity in irradiated metals. The reactions obtained included defect shear, drag and absorption in edg…
We report results on structural and optical spectroscopic properties of Mn-doped YAlO 3 (YAP) ceramics prepared by a solid-state reaction method starting from nanocrystalline oxides. A series of ceramic samples with different Mn concentrations and different Y 2 O 3 –Al 2 O 3 compositions have been studied by means of…
The mechanisms of adsorption and dissociation of CO x ( x = 1, 2) molecules on the W(111) surface have been investigated at the periodic density functional theory (DFT) level in conjunction with the projector- augmented wave (PAW) approach. The molecular structures, vibrational frequencies, and binding energies of W(1…
X-ray absorption near edge structure (XANES) measurements at the Ni $K$ edge of $\mathrm{Pr}\mathrm{Ni}{\mathrm{O}}_{3}$ across the metal insulator transition show that a change in the local lattice structure accompanies such transition. Theoretical calculations of the XANES show that the observed features of the spec…
Polymerization of vinylquinoline monomers onto properly modified single-wall carbon nanotubes (SWNT) using atom transfer radical polymerization (ATRP) conditions resulted in efficient grafting of optically active oligomeric chains onto the nanotubes. Two different carbon nanotube (CNT) modification procedures were use…
Utrasensitive detection of trace analytes by fluorescence benefits forfluorescence amplifying substrates. We review here our recent work concerned withunderstanding of enhancement mechanisms and formation of three such substrates: silverfractals, silver coated gold nanoparticles deposited on glass and fluorescence enh…