Materials Literature
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We have carried out a systematic investigation of the anodization procedure in order to determine the exact chemical mechanism of the dissolution process responsible for pore formation in nanoporous alumina templates. We measured the anodization current as a function of time and compared it with the thickness of porou…
Deep macropores in n-type Si have been completely filled with copper ͑Cu͒.Homogeneous metal deposition inside the deep pores was achieved by means of electroplating using a solution containing only Cu 2 SO 4 mixed with H 2 SO 4 and no additives.Initial nucleation of the Cu deposition was confined to the bottom of the…
A sticky combination: Mesoporous carbon–polymer spheres with adjustable magnetic functionality and chemical specificity are derived from nontoxic materials (see FESEM image). An additional advantage of this method is that the pore-size distribution of the materials can be modulated from monomodal to bimodal, which mak…
The nitrogen-doping induced changes in optical properties and electronic structures of SrTiO3 films have been investigated by using spectroscopic ellipsometry and x-ray photoemission spectroscopy. Combined with the first-principles calculations, it is found that the localized N 2p states above O 2p states are attribut…
By measuring and calculating oblique-incidence transmittance spectra of a negative-index photonic metamaterial layer, the authors infer the in-plane dispersion relation of the magnetization wave. From the geometry and the dispersion shape, the authors conclude that coupling is predominantly via magnetic dipoles for wa…
The authors report ultraviolet electroluminescence from ZnO nanoparticle-based devices prepared by the phase-segregation technique. The conditions for phase segregation are investigated using confocal microscopy. With proper parameters for phase segregation, the ZnO nanoparticles and N,N′-diphenyl-N,N′-bis(3-methylphe…
Ceramics of 0.67Bi(Fe1−xTix)O3+x∕2–0.33PbTiO3 (x=0, 0.005, 0.01, 0.02, 0.04) were prepared by solid state reactions, with a relative density of 94%–97%. The dielectric and ferroelectric properties of the ceramics have been significantly improved by means of aliovalent ionic substitution of Ti4+ for Fe3+, which reduces…
This paper presents a molecular simulation study of the interactions of a protein (lysozyme) with self-assembled monolayers (SAMs) of mannitol and sorbitol terminated alkanethiols in the presence of explicit water molecules and ions. The all-atom simulations were performed to calculate the force generated on the prote…
A novel mutant of the marine oil-degrading bacterium Alcanivorax borkumensis SK2, containing a mini-Tn5 transposon disrupting a "tesB-like" acyl-coenzyme A (CoA) thioesterase gene, was found to hyperproduce polyhydroxyalkanoates (PHA), resulting in the extracellular deposition of this biotechnologically important poly…
A series of orange–red emitting phosphor compositions have been synthesized and characterized by powder X-ray diffraction (XRD) and photoluminescence. XRD results reveal a phase transition from orthorhombic to pseudocubic structure for . All the compositions show broad charge-transfer band absorption in the near-ultra…
The authors report femtosecond dynamics of the coherent optical phonon of single crystal diamond. Sub-10fs, 395nm laser pulses excite 40THz coherent phonons with an extremely small damping rate (0.15ps−1). Linear power dependence of the phonon amplitude under off-resonant excitation condition gives a direct evidence f…
Nanophosphors of (YAG/Ce) were synthesized with a novel salted sol-gel (SSG) method in which a water solution of inorganic salt, yttrium nitrate [ , YNO], was used with a traditional metal alkoxide precursor, aluminum sec-butoxide [ , ASB], in sol-gel synthesis. With the SSG method, a YAG single phase could be obtaine…
The authors studied acetylation of bacterial cellulose (BC) nanofibers to widen the applications of BC nanocomposites in optoelectronic devices. The slight acetylation of BC nanofibers significantly reduces the hygroscopicity of BC nanocomposites, while maintaining their high optical transparency and thermal stability…
Twenty-one hybrid materials incorporating cobalt(III) corrole complexes were synthesized by a sol-gel process or by grafting the metallocorrole onto a mesostructured silica of the SBA-15 type. All the materials show an almost infinite selectivity for carbon monoxide with respect to dinitrogen and dioxygen in the low-p…
In organic field effect transistors (FETs), charges move near the surface of an organic semiconductor, at the interface with a dielectric. In the past, the nature of the microscopic motion of charge carriers -that determines the device performance- has been related to the quality of the organic semiconductor. Recently…
How stable vortex-like magnetization in magnetic nanodisks with small aspect ratio ($L/R<<1$) is affected by two antidots is investigated analytically and by Monte Carlo simulations. For suitable ranges of the physical parameters this vortex presents bistable states when pinned around the antidots. The hysteresis loop…
The electrochemical mechanism leading to the pseudocapacitance of in aqueous electrolyte solutions has been investigated by, in addition to electrochemical characterization, synchrotron X-ray absorption near-edge spectroscopy (XANES) and X-ray diffraction (XRD) analyses using solution as the model electrolyte. The fer…
La 0.827 Al 11.9 O 19.09 : Eu 2 + , Mn 2 + showed three emission bands when excited by ultraviolet light. A blue emission originates from Eu2+, whereas both green and red emissions originate from Mn2+. The luminescent mechanism is explained invoking the energy transfer of Eu2+→Mn2+ and Mn2+(tetrahedralsite)→Mn2+(octah…
Arrays of epitaxial, vertically oriented nanorods of ZnO are grown at low temperature (80°C) on the (0002) plane of GaN single crystals by electrodeposition in an aqueous solution. The freestanding nanocolumns are prepared by a template-free method based on simple solution chemistry. At room temperature, the nanorods…
For the accurate analysis and design of microforming process, proper modeling of material behavior at the micro/mesoscale is necessary by considering the size effects. Two size effects are known to exist in metallic materials. One is the “grain size” effect, and the other is the “feature/specimen size” effect. This st…