Materials Literature
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We investigate the spin species relevant for the spin-dependent recombination used for the electrical readout of coherent spin manipulation in phosphorus-doped silicon. Via a multi-frequency pump-probe experiment in pulsed electrically detected magnetic resonance, we demonstrate that the dominant spin-dependent recomb…
Band gap modification for small-diameter (1 nm) silicon nanowires resulting from the use of different species for surface termination is investigated by density functional theory calculations. Because of quantum confinement, small-diameter wires exhibit a direct band gap that increases as the wire diameter narrows, ir…
We report a memory resistance (memristor) behavior with nonlinear current-voltage characteristics and bipolar hysteretic resistance switching in the nanocolumnar manganite (LSMO) films. The switching from a high (HRS) to a low (LRS) resistance occurs at a bias field ~1 MV/cm. Applied electric field drops mostly at the…
Seven CNT (carbon nanotube) handling workplaces were investigated for exposure assessment. Personal sampling, area sampling, and real-time monitoring using an SMPS (scanning mobility particle sizer), dust monitor, and aethalometer were performed to characterize the mass exposure, particle size distribution, and partic…
Here we report a larger-scale atomic-level molecular dynamics (MD) simulation for the self-assembly of sodium dodecyl sulfate (SDS) surfactant on single-walled carbon nanotube (SWNT) surfaces and the interaction between supramolecular SDS/SWNT aggregates. We make an effort to address several important problems in rega…
We report a simple and efficient synthetic method to prepare gold nanoparticles (AuNPs) in aqueous phase using HAuCl(4) and poly(ethylene glycol) (PEG) ligands appended with bidentate anchoring groups. Our approach provides narrow size distribution nanocrystals over the size range between 1.5 and 18 nm; this range is…
Magnetism in systems that do not contain transition metal or rare earth ions was recently observed or predicted to exist in a wide variety of systems. We summarize both experimental and theoretical results obtained for ideal bulk II-V and II-IV compounds, molecular crystals containing O(2) or N(2) molecules as structu…
Significant conductivity enhancement was observed on transparent and conductive poly(3,4-ethylene dioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) films after a treatment with organic and inorganic acids, including acetic acid, propionic acid, butyric acid, oxalic acid, sulfurous acid, and hydrochloric acid. The co…
Abstract The Ag/graphene heterostructures were synthesized through a simple thermal reduction process. The interaction between Ag nanoparticles and graphene supports along with the surface plasmon resonance properties of Ag nanoparticles on graphene were investigated for the first time.
The effect of linear tension on the structure and properties of metals and alloys is investigated. Technological possibilities to activate the recrystallization process and to prevent the grain growth in order to effectively refine the structure are considered.
采用水/乙醇为反应溶剂，用高碘酸钠氧化海藻酸钠，制备了多醛基海藻酸钠（multi-aldehyde sodium alginate, MASA）。采用费林试剂、盐酸羟胺-NaOH电位滴定法、乌氏粘度计、与明胶的交联反应分别对氧化后的海藻酸钠进行表征。结果发现，氧化的海藻酸钠溶液可与费林试剂反应生成砖红色沉淀；海藻酸钠的氧化度随高碘酸钠用量及反应时间的增加而增加。投料比为80%时，氧化度最高可达约80％，收率约58.7%。MASA的粘度随反应时间、高碘酸钠浓度的增加而急剧下降。氧化度分别为20%、40%、60%的MASA，37℃下可使明胶在5 min内生成凝胶。因此，以水/乙醇作为反应介质、通过控制氧化剂的用量和反应时间，可以得到产…
The dissolution of nickel metal in nitric acid in the presence of the dichromate anion as the oxidizer is reported. The formation of Ni(II) and Cr(III) nitrates takes place in two steps with the intermediate formation of nitrous acid. A new method to synthesize the nickel-chromium oxide catalyst from nickel and chromi…
Component interactions in the iron-molybdenum-samarium system at 773 K were studied by powder X-ray diffraction, microstructure observation, electron probe microanalysis, and hardness and microhardness testing. The formation of a ternary intermetallic compound π with a ThMn 12 structural type was found in this system.…
The application of a multistate Markov chain is considered as a model of electromigration interconnect degradation and eventual failure. Such a model has already been used [Tan et al., J. Appl. Phys. 102, 103703 (2007)], maintaining that, in general, it leads to a failure distribution described by a gamma mixture, and…
Abstract Vermiculites have the potential to serve as effective catalysts if pillared with Al, but their high charge presents an obstacle to the pillaring process. The purpose of this study was to submit natural vermiculite to thermal treatments in the presence of water vapor in order to effect a reduction in the globa…
Solutions of metal salts in liquid polar dielectrics were considered in the approximation of a single ion placed in a system of liquid polar dielectric molecules and a system of interacting charged particles, such as cations, anions, and polarized liquid polar dielectric molecules, arranged around them. The sizes of t…
The emission spectra were measured for the sol-gel glass 5.7Na 2 O · 19B 2 O 3 · 75.35SiO 2 with chemical composition prepared under different experimental conditions, and the characteristic features of emission spectra are discussed. The results show the broad visible (500–750 nm) and IR (850–1350 nm) emission with u…
We report on the camera materials test chamber, a multivessel apparatus that analyzes the outgassing consequences of candidate materials for use in the vacuum cryostat of a new telescope camera. The system measures the outgassing products and rates of samples of materials at different temperatures and collects films o…
Photocurrents in liquid crystal cells of different structures were experimentally studied. The results of the study confirm the photorefractive mechanism of the light beam self-action in nematic liquid crystals, which consists in a decrease in the density of surface charges screening an external electric field upon li…
Bioimaging is an important tool for investigation and visualization of biological phenomena and as diagnostic tool in medicine. In this context upconverting Gd2O3:Er3+, Yb3+nanostructures (nanoparticles, nanorods) have been synthesized and investigated with regard to potential biomedical applications. Besides size and…