Materials Literature
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Using first-principles calculations, we investigate the structural stability and electronic properties of the smallest (2,2) carbon nanotube as the inner wall of the double-walled carbon nanotubes. The results indicate that an isolated (2,2) carbon nanotube is unstable upon unrolling in free space, while it can exist…
Optical devices based on polymer-dispersed liquid crystal (PDLC) thin films derive their functional properties from the electric-field-induced reorientation of (sub)micrometer-sized polymer-dispersed liquid crystal (LC) droplets. In these materials, the LC reorientation dynamics are strongly dependent on droplet size…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTNovel Inorganic−Organic Hybrid Block Copolymers as Pore Generators for Nanoporous Ultralow-Dielectric-Constant FilmsHyun Wook Ro, Kook Ji Kim, Patrick Theato, David W. Gidley, and Do Y. YoonView Author Information School of Chemistry, Seoul National University, Seoul 151-747, K…
The switching of extended ${\mathrm{Ni}}_{81}{\mathrm{Fe}}_{19}$ thin film elements with a thickness of $50\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$ and various shapes (squared, rectangular, pointed) has been studied by time-resolved stroboscopic Kerr microscopy based on a conventional wide-field optical polarization mi…
We report the observation of unusually strong and systematic changes in the electron transport in metallic single-walled carbon nanotubes that are undergoing collisions with inert gas atoms or small molecules. At fixed gas temperature and pressure, changes in the resistance and thermopower of thin films are observed t…
The instrument VOLPE (volume photoemission from solids) is an experimental setup dedicated to high energy photoemission (PE) experiments. The instrument is equipped with an electrostatic hemispherical spectrometer especially designed to analyze high energy electrons (up to 10 keV) with high resolving power. In order t…
The physical and electric properties of several silver pastes, Pb-Sn solder, and indium were systematically investigated as potential binders for attaching electrodes to bismuth-based bulk or nanowire array thermoelectric elements. Scanning electron microscopy observations and x-ray diffraction surface measurements of…
The orf6 gene from the clavulanic acid biosynthesis gene cluster encodes an OAT (ornithine acetyltransferase). Similar to other OATs the enzyme has been shown to catalyse the reversible transfer of an acetyl group from N-acetylornithine to glutamate. OATs are Ntn (N-terminal nucleophile) enzymes, but are distinct from…
Abstract Unsaturated polyester (UP) systems give rise to numerous possible approaches in synthesizing nanocomposites. A simultaneous mixing method was used to synthesize UP‐resin/organo‐clay nanocomposites. The effects of various mixing processes, using several organically‐modified clay types, were investigated. The i…
The electronic structure of the tin oxides SnO and $\mathrm{Sn}{\mathrm{O}}_{2}$ is studied using the fine structure of the $\mathrm{Sn}\text{--}{M}_{4,5}$ and oxygen $K$-edges measured by electron energy loss spectroscopy (EELS). The experimental results are compared with real-space multiple scattering calculations.…
High-density Zn0.85In0.15O and Zn0.75In0.25O nanowires were synthesized by thermal evaporation method. They consist of single-crystalline wurtzite ZnO structure with uniform [010] growth direction. X-ray diffraction (XRD) reveals the structural defects caused by the In incorporation. X-ray photoelectron spectrum (XPS)…
A single gold nanoparticle is attached to the end of a chemically etched fiber axicon microlens tip by modifying the tip surface with linker molecules. The high collection efficiency of the fiber axicon microlens allows plasmon scattering of a single nanoparticle to be measured directly through the optical fiber. The…
In situ monitoring parameters are indispensable for thin film fabrication. Among them, thickness and deposition rate control are often the most important in achieving the reproducibility necessary for technological exploitation of physical phenomena dependent on film microstructure. This review describes the types of…
Following our former study of the $\mathrm{C}\mathrm{O}∕\mathrm{Ni}\mathrm{O}(100)$ system [Phys. Rev. B 69, 075413 (2004)], we have investigated the geometrical, electronic, and magnetic properties of NO adsorbed on NiO(100) to further elucidate the role of strong electron correlations in the substrate on the chemiso…
Highly delaminated clay/poly(dicyclopentadiene) nanocomposites were prepared by in-situ, ring-opening metathesis polymerization of presonicated mixtures of the liquid dicyclopentadiene (DCPD) and organically modified Montmorillonite clays. Three nanocomposite series (using Montmorillonites: I-28, I-44pa) of increasing…
Abstract An attempt has been made to investigate the effect of the block length of hydrophilic segments on the structure and mass transfer properties of segmented polyurethane (HSPU). Three different block lengths of hydrophilic poly(ethylene glycol) (PEG) segments were used, namely PEG‐200, PEG‐2000 and PEG‐3400, whe…
The contribution of plastic strain evolution of mobile and forest dislocation densities to the thermal and athermal components of polycrystalline metals flow stress is investigated in this work. The thermomechanical response is characterized here for body centered cubic (bcc), face centered cubic (fcc) and hexagonal c…
Vascular smooth muscle cell (SMC) migration is a hallmark of intimal hyperplasia (IH), the progression of which is affected by hemodynamic conditions at the diseased site. The realization that SMCs are exposed to blood flow in both denuded vessels (direct blood flow) and intact vessels (interstitial blood flow) motiva…
Flowerlike cupped-end ZnO microrod bundles have been hydrothermally synthesized from precursor ZnCl2(N2H4)2 in sheet shape at 140 degrees C for 12 h; under the same conditions using the same precursor in rod shape, uniform ZnO nanorods were obtained. XRD pattern indicated the sample is ZnO with hexagonal cell contants…
The transcription factor Ets-1 is regulated by the allosteric coupling of DNA binding with the unfolding of an alpha-helix (HI-1) within an autoinhibitory module. To understand the structural and dynamic basis for this autoinhibition, we have used NMR spectroscopy to characterize Ets-1DeltaN301, a partially inhibited…