Materials Literature
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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…
The application of stress to multiphase solid-liquid systems often results in morphological instabilities. Here we propose a solid-solid phase transformation model for roughening instability in the interface between two porous materials with different porosities under normal compression stresses. This instability is t…
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…
We study magnetic-field-dependent nonresonant microwave absorption and dispersion in thin ${\mathrm{La}}_{0.7}{\mathrm{Sr}}_{0.3}\mathrm{Mn}{\mathrm{O}}_{3}$ films and show that it originates from colossal magnetoresistance. We develop a model for the magnetoresistance of a thin ferromagnetic film in an oblique magnet…
The simulation of field electron emission from arrays of micrometer-long open-ended (5,5) carbon nanotubes is performed in the framework of quantum theory of many electrons. It is found that the applied external field is strongly screened when the spacing distance is shorter than the length of the carbon nanotubes. Th…
We present exact analytical and numerical results for the electronic spectra and the Friedel oscillations around a substitutional impurity atom in a graphene lattice. A chemical dopant in graphene introduces changes in the on-site potential as well as in the hopping amplitude. We employ a T -matrix formalism and find…
It is well-known that block copolymer thin films can be easily prepared on different substrates by spin coating. Here, we show that the cylindrical microdomains of polystyrene- b -poly(4-vinylpyridine) (PS- b -P4VP) copolymers can be oriented normal to the surface over a large area by spin coating in toluene/THF solve…
We model a sheared disordered solid using the theory of shear transformation zones (STZs). In this mean-field continuum model the density of zones is governed by an effective temperature that approaches a steady state value as energy is dissipated. We compare the STZ model to simulations by Shi [Phys. Rev. Lett. 98, 1…
Nearly monodisperse and well-defined one-dimensional (1D) Gd 2 O 3:Eu 3+ nanorods and microrods were successfully prepared through a large-scale and facile hydrothermal method followed by a subsequent heat treatment process, without using any catalyst or template. X-ray diffraction (XRD), thermogravimetric analysis an…
We present theoretical and experimental studies of the optical response of L-shaped silver nanoparticles. The scattering spectrum exhibits several plasmon resonances that depend sensitively on the polarization of the incident electromagnetic field. The physical origin of the resonances is traced to different plasmon p…