Materials Literature
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Abstract In this study, polylactide (PLA)-multi-walled carbon nanotube (MWCNT) nanocomposites were melt-compounded using a twin-screw extruder. Solid and microcellular tensile bar specimens were produced via conventional and microcellular injection molding, respectively. Various characterization techniques were applie…
Use of sol–gel condensation reactions with the proper precursors, in conjunction with electrospinning methods, leads to the facile formation of one-dimensional nanofibers of silicon or germanium dioxide doped with erbium. These nanowires are characterized by a combination of scanning and transmission electron microsco…
Abstract The stability of chitosan with a degree of deacetylation (DD) of 88 and 81% was investigated in solution during storage for 60 days at various temperatures (60, 28, and 5°C) and acid concentrations (0.8 M , 0.2 M , and 0.1 M ). The first‐order rate constant of chain hydrolysis of 88%DD chitosan at 60°C was ab…
ZnO thin films with c -axis orientation have been prepared by a sol–gel method on glass substrates. An ethanol solution mixed with zinc acetate dihydrate and monoethanolamine was used as the precursor for spin-coating. Preferentially oriented ZnO thin films were prepared by preheating the as-deposited films at 300 °C…
An electrogenerated precursor has been developed for green synthesis of highly luminescent aqueous CdTe quantum dots (QDs) with unique quantum yield and strong electrogenerated luminescence, which can access cellular targets via specific binding and have potential application as biolabels in highly sensitive biosensin…
The method of pseudopotentials within the generalized gradient approximation has been employed to calculate the phase stability, electronic structure and elastic constants of β, α'' and ω metastable phases in the Ti–25 at.% Nb alloy. The bulk, shear and Young's moduli of those metastable phases are estimated from the…
We report a previously unknown body-centered-tetragonal structure for ZnO. This structure results from a phase transformation from wurtzite in [0001]-oriented nanorods during uniaxial tensile loading and is the most stable phase for ZnO when stress is above $7\phantom{\rule{0.3em}{0ex}}\mathrm{GPa}$. The stress-induce…
We report density functional studies of the (001) surface of magnetite that account for local Coulomb interactions. Iron cations in the surface layers exhibit charge and ${t}_{2g}$ orbital ordering that is coupled with the lattice strains. Orbital ordering is present for various surface stoichiometries and causes open…
Self-healing via a vascular network is an active research topic, with several recent publications reporting the application and optimization of these systems. This work represents the first consideration of the probable failure modes of a self-healing system as a driver for network design. The critical failure modes o…
The luminescence efficiency of individual single-walled carbon nanotubes was determined by comparing the fluorescence from individual nanotubes to single CdTe/ZnS quantum dots with a well-defined fluorescence quantum yield (QY). The single carbon nanotube QY was determined to be 3 +/- 1%, nearly 100 times greater than…
A dry-jet wet spinning process for making magnetically active cellulose fibers has been developed using the ionic liquid (IL) 1-ethyl-3-methylimidazolium chloride ([C2mim]Cl). Cellulose from different sources with various degrees of polymerization (DP) was used for making fibers by first dissolving the cellulose in th…
CuInSe 2 related materials-based heterojunction diodes have received much attention, owing to their highest power conversion efficiency (19.5%) among all the thin-film solar cell technologies. Important issues on the microstructure and formation mechanism of CuInSe 2 −CdS p-n heterojunction persist due to the complexi…
A novel self-supported nanoporous gold film electrode with ultrahigh surface area shows excellent electrocatalytic activity and stability toward the direct oxidation of methanol in alkaline solution. The activity of NPGF electrode was about 400 times that of the smooth gold electrode and did not decrease after 100 cyc…
Sending signals: The first core-modified, expanded porphyrin with polyaromatic units fused to the pyrrole rings absorbs far into the near-infrared and shows fluorescence that stretches into the second optical window of telecommunication. Doping a polyurethane membrane with the dye yields Hg2+-responsive optical test s…
We calculate the thermopower in ${\mathrm{Na}}_{x}\mathrm{Co}{\mathrm{O}}_{2}$ using the standard Boltzmann transport theory and first principles electronic structures with spin polarization taken into account. The thermopower is found to be smaller when the system is polarized, which thereby provides an alternative r…
Thin films of magnetite (Fe3O4) are grown on single crystal GaAs (100) substrate by pulsed laser deposition. X ray diffraction (XRD) result shows the (111) preferred orientation of the Fe3O4 film and x-ray photoelectron spectroscopy confirm the presence of single phase Fe3O4 in the film. The electrical transport prope…
Square lattice gas models for heteroepitaxial growth are studied by means of kinetic Monte Carlo simulations, in order to find a possible origin of anisotropic island shape observed in growth experiments of long organic molecules. When deposited molecules form clusters irreversibly at their encounter during surface di…
One of the main elements of the self-consistent generalized Langevin equation (SCGLE) theory of colloid dynamics [Phys. Rev. E {\bf 62}, 3382 (2000); ibid {\bf 72}, 031107 (2005)] is the introduction of exact short-time moment conditions in its formulation. The need to previously calculate these exact short-time prope…
We present a shear-transformation-zone (STZ)-based analysis of numerical simulations by Haxton and Liu [Phys. Rev. Lett. 99, 195701 (2007)]. The extensive Haxton and Liu (HL) data sharply test the basic assumptions of the STZ theory, especially the central role played by the effective disorder temperature as a dynamic…
We studied magnetic-field-dependent microwave absorption in epitaxial ${\mathrm{La}}_{0.7}{\mathrm{Sr}}_{0.3}\mathrm{Mn}{\mathrm{O}}_{3}$ films using an $9.5\phantom{\rule{0.3em}{0ex}}\mathrm{GHz}$ Bruker electron-spin-resonance spectrometer. By analyzing the angular and temperature dependence of the ferromagnetic and…