Materials Literature
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A model describing phonon heat conduction in silicon nanowires formed by interconnected nanoparticles is developed from basic principles of the elementary kinetic theory of gases. The thermal transport in a network of the interconnected nanoparticles forming a nanowire is found to be mainly controlled by the interconn…
We report low-temperature near-field spectroscopy of isolated ZnO∕ZnMgO single-quantum-well structures (SQWs) on the end of ZnO nanorod to define their potential for nanophotonics. First, absorption spectra of isolated ZnO∕ZnMgO nanorod SQWs with the Stokes shift as small as 3meV and very sharp photoluminescent peaks…
Abstract Carbosilane fine particles were synthesized by core‐crosslinking of carbosilane block copolymer micelles and they were pyrolytically transformed into silica nanoparticles. The carbosilane block copolymer, poly(1‐(3‐butenyl)‐1‐methylsilacyclobutane)‐ block ‐polystyrene, (polyBMSB‐ b ‐polySt), [( m , n ) = (31,…
Current–voltage measurements were used to study the electrical and hydrogen sensing characteristics of Pd Schottky contacts fabricated on ZnO. The ZnO films were grown on doped GaAs by MOCVD. By utilizing the GaAs substrate as a low resistance contact to the ZnO film, a remarkably low series resistance of the diodes w…
The specific heat of multiwalled titanium dioxide (anatase phase) nanotubes has been measured between 1.5 and 95K. Bulk anatase and rutile were also measured. The nanotube specific heat approaches that of bulk anatase at high temperatures. Below about 50K the nanotube specific heat begins to show large enhancements co…
Abstract A selection of new acetylenic building blocks has been prepared and employed for construction of extended tetrathiafulvalenes (TTFs) and novel donor–acceptor molecules based on either diethynylethene (DEE), triethynylethene (TriEE), or tetraethynylethene (TEE) cores. The novel chromophores were studied for th…
Abstract A series of polyacrylate monomers with F ‐alkylalkyl [F(CF 2 ) n (CH 2 ) n ′ ] side groups were prepared by free‐radical polymerization. The effect of the chemical structure on the surface properties of poly(ethylene terephthalate)s was evaluated by variations in the relative length of the fluorocarbon and hy…
Abstract A novel dispersion copolymerization of maleic anhydride (MAn) and vinyl acetate (VAc) without adding stabilizer is developed, which gives uniform copolymer microspheres with tunable sizes. Some principal factors affecting the microspheres, such as reaction time, monomer concentration and feed ratio, reaction…
A crossover from negative to positive magnetoresistance (MR) is observed in the heterojunction composed of a La0.7Ce0.3MnO3 film and a 0.5wt.% Nb-doped SrTiO3 substrate. The temperature and bias current dependences of MR sign in the junction are investigated carefully. It is found that the positive MR occurs when temp…
Reverser Spin-Crossover (RSCO), der reversible Spinübergang vom High- zum Low-Spin-Zustand beim Erhitzen, tritt in den Verbindungen [Co(Cn-terpy)2](BF4)2 auf, in denen Cn-terpy ein Terpyridinligand mit einer langen Alkoxykette (AC, n=14 oder 16 Methyleneinheiten; siehe Bild) ist. Die breite thermische Hysterese des RS…
Ethylenediamine (EDA)-core poly(amidoamine) (PAMAM) succinamic acid dendrimers (Ex.SAH, where x refers to the generation) were synthesized and analyzed by polyacrylamide gel electrophoresis (PAGE), size-exclusion chromatography (SEC), potentiometric acid-base titration, and capillary zone electrophoresis (CZE). Variou…
Nine phenyl glucoside or galactoside amphiphiles possessing a saturated or unsaturated long alkyl-chain group as the self-assembling unit of a highly organized molecular architecture were synthesized. Their self-assembly properties were investigated by using energy-filtering TEM (EF-TEM), SEM, CD, XRD, and FT-IR techn…
We have fabricated metals (Au/Pt/Ti) Ohmic contacts on mesa structures of boron-doped homoepitaxial diamond films by metal deposition followed by various thermal annealing processes. Specific contact resistance was determined by characterizing the current?voltage relations from transmission line model (TLM) measuremen…
The distance dependence of the localized surface plasmon (SP) extinction of discontinuous gold films is a crucial issue in the application of transmission surface plasmon resonance (T-SPR) spectroscopy to chemical and biological sensing. This derives from the usual sensing configuration, whereby an analyte binds to a…
Graphite is the most stable form of carbon under room temperature and atmospheric pressure, and consists of two-dimensional honeycomb lattices with intralayer $s{p}^{2}$ bonding and rather weak van der Waals like interlayer interaction. When we supply gaseous small carbonic molecules such as methane to a patch of grap…
In this investigation, we studied electronic properties of the CdS∕Zn1−xMgxO (x=0,0.15) interface using photoelectron spectroscopy. ZnO and (Zn,Mg)O films were deposited by magnetron sputtering from ceramic targets on thermally evaporated CdS. Valence-band offsets of ΔEV=1.2±0.1eV are determined for both interfaces. T…
Indium tin oxide (ITO) is widely utilized in numerous industrial applications due to its unique combined properties of transparency to visible light and electrical conductivity. ITO films were deposited on glass substrates by an electron beam evaporation technique at room temperature from bulk samples, with different…
Superparamagnetic polymer nanofibers intended for drug delivery and therapy are considered here. Magnetite (Fe3O4) nanoparticles in the diameter range of 5-10 nm were synthesized in aqueous solution. Polymer nanofibers containing magnetite nanoparticles were prepared from commercially available poly(hydroxyethyl metha…
A wide variety of well-defined multivalent peptides and proteins can be made by conjugating synthetic peptides and recombinantly expressed proteins to cysteine-functionalized dendrimers using native chemical ligation (see picture). This modular approach provides access to dendrimers that are attractive both for unders…
The interaction of a lithotripter shock wave (LSW) with laser-generated single vapor bubbles in water is investigated using high-speed photography and pressure measurement via a fiber-optic probe hydrophone. The interaction leads to nonspherical collapse of the bubble with secondary shock wave emission and microjet fo…