Yong Chun Quan、Jongryang Joo Jongryang Joo、Donggeun Jung1999-03-01Japanese Journal of Applied Physics
Polymer-like organic thin films were deposited by plasma enhanced chemical vapor deposition (PECVD) using the para-xylene precursor. The effect of the plasma power on the dielectric constant and thermal stability was significant. As the plasma power was increased from 5 W to 60 W, the relative dielectric constant incr…
Semiconductor materials and devicesCopper Interconnects and ReliabilitySynthesis and properties of polymers
Jae Ryoun Youn、Hyeog Park1999-03-01Polymer Engineering and Science
Abstract Processing of microcellular foam was studied for polyurethane. Assuming that the bubble growth is controlled by diffusion, theoretical prediction was carried out numerically to understand the bubble growth mechanism in the cavity during mold filling. Final bubble sizes were also predicted by considering the g…
Polymer composites and self-healingEpoxy Resin Curing ProcessesPolymer Foaming and Composites
Sihai Chen、Keisaku Kimura1999-03-01Chemistry Letters
Abstract CdS-Au hybrid nanoparticles are synthesized through electrostatically self-assembling of the pre-formed monodisperse CdS and Au nanoparticles via the interaction between ammonium ions and carboxylate ions which were modified on CdS and Au nanoparticle surface, respectively.
Gold and Silver Nanoparticles Synthesis and ApplicationsLaser-Ablation Synthesis of NanoparticlesNanotechnology research and applications
Sheng‐Huei Hsiao、Liang-Ru Dai1999-03-01Journal of Polymer Science Part A Polymer Chemistry
Four bis(ether anhydride)s, 4,4′-(1,4-phenylenedioxy)diphthalic anhydride (IV), 4,4′-(2,5-tolylenedioxy)-diphthalic anhydride (Me-IV), 4,4′-(2-chloro-1,4-phenylenedioxy)diphthalic anhydride (Cl-IV), and 4,4′-(2,5-biphenylenedioxy)diphthalic anhydride (Ph-IV), were prepared in three steps starting from the nucleophilic…
Epoxy Resin Curing ProcessesSynthesis and properties of polymersSilicone and Siloxane Chemistry
K. J. Koivusaari、J. Levoska、S. Leppävuori1999-03-01Journal of Applied Physics
In the pulsed-laser deposition process, high intensity laser pulses expel material from a solid target and form expanding plasma near the solid surface. The expansion of the plasma produces a forward-directed beam of ionized and neutral species with typical energies of 1–100 eV. In this study, amorphous diamond-like c…
Diamond and Carbon-based Materials ResearchLaser-induced spectroscopy and plasmaIon-surface interactions and analysis
Oksana Y. Mindyuk、Paul A. Heiney1999-03-01Advanced Materials
Langmuir films composed of disc-shaped molecules (rather than traditional amphiphiles) are briefly reviewed. The molecules investigated typically have a flat, conjugated core and flexible side chains, such as the triphenylene derivatives shown in the Figure. Information obtainable from pressure–area isotherms is discu…
Supramolecular Chemistry and ComplexesPorphyrin and Phthalocyanine ChemistrySynthesis and properties of polymers
Xin Wang、Ulf Helmersson、Lynnette D. Madsen 等 8 位作者1999-03-01Journal of Vacuum Science & Technology A Vacuum Surfaces and Films
Epitaxial (001) oriented SrTiO3 films have been deposited on LaAlO3(001) substrates by off-axis radio frequency magnetron sputtering in Ar:O2 gas mixtures at substrate temperatures ranging from 650 to 850 °C. For the deposition conditions used, stoichiometric targets yielded 20% Sr-deficient films, whereas Sr-enriched…
Ferroelectric and Piezoelectric MaterialsSemiconductor materials and devicesElectronic and Structural Properties of Oxides
Satoshi Akanuma、Akihiko Yamagishi、Nobuo Tanaka 等 4 位作者1999-03-01European Journal of Biochemistry
A thermostabilized mutant of Bacillus subtilis 3-isopropylmalate dehydrogenase (IPMDH) obtained in a previous study contained a set of triple amino acid substitutions. To further improve the stability of the mutant, we used a random mutagenesis technique and identified two additional thermostabilizing substitutions, T…
Protein purification and stabilityEnzyme Structure and FunctionBiochemical and Molecular Research
S. Ravi P. Silva、G.A.J. Amaratunga、Ken Okano1999-03-01Journal of Vacuum Science & Technology B Microelectronics and Nanometer Structures Processing Measurement and Phenomena
Electron field emission has been observed from carbon thin films at relatively low electric fields. These films range from amorphous carbon to polycrystalline diamond films. There are many models that attempt to account for the electron field emission process observed in these films. The initial models that were based…
Carbon Nanotubes in CompositesSemiconductor materials and devicesDiamond and Carbon-based Materials Research
Maria Berfeld、David Zbaida、Leslie Leiserowitz 等 4 位作者1999-03-01Advanced Materials
Pure enantiomers are frequently prepared by the technique of resolution by entrainment. However, this does not work if the samples are lamellarly twinned conglomerate crystals, which is often the case for α-amino acid salts, especially amphiphilic ones. A method based on the addition of chiral /6tailor-made′ enantiose…
Calcium Carbonate Crystallization and InhibitionCrystallization and Solubility StudiesSurface Chemistry and Catalysis
Zhongqin Yang、Ling Ye、Xide Xie1999-03-01Physical review. B, Condensed matter
The electronic structures of the doped perovskite oxides, ${\mathrm{LaMn}}_{1\ensuremath{-}x}{\mathrm{Co}}_{x}{\mathrm{O}}_{3} (x=0.0,$ 0.25, 0.5, 0.75, 1.0), are studied using density-functional methods. In the 0.25- and 0.75-doped system, metallic property is found, while for the 0.5-doped compound with both orthorh…
Magnetic and transport properties of perovskites and related materialsAdvanced Condensed Matter PhysicsThermal Expansion and Ionic Conductivity
Takashi Kato、Takahiro Amamiya1999-03-01Chemistry Letters
Abstract Thin film coating of CaCO3 crystals on a chitin fiber from CaCO3 solution in the presence of an acid-rich macromolecule leads to the fabrication of a novel type of organic/inorganic composites. Molecular interactions between functional groups of these organic matrices play a key role for this control of inorg…
Corrosion Behavior and InhibitionCalcium Carbonate Crystallization and InhibitionCephalopods and Marine Biology
Christophe Léger、Cécile Tessier、Michel Ménétrier 等 5 位作者1999-03-01Journal of The Electrochemical Society
The galvanostatic reduction of the nickel hydroxide electrode is known to proceed at two successive potentials without this phenomenon being well understood. In this paper we prove that this second discharge plateau is unrelated to oxygen reduction and that it can be observed in the absence of the γ‐NiOOH hydrated pha…
Corrosion Behavior and InhibitionTransition Metal Oxide NanomaterialsAnalytical Chemistry and Sensors
V. Kiryukhin、Y. J. Wang、F. C. Chou 等 5 位作者1999-03-01Physical review. B, Condensed matter
We report a synchrotron x-ray-scattering study of the magnetoresistive manganite ${\mathrm{La}}_{0.875}{\mathrm{Sr}}_{0.125}{\mathrm{MnO}}_{3}.$ At low temperatures, this material undergoes an x-ray-induced structural transition at which charge ordering of ${\mathrm{Mn}}^{3+}$ and ${\mathrm{Mn}}^{4+}$ ions characteris…
Magnetic and transport properties of perovskites and related materialsRare-earth and actinide compoundsAdvanced Condensed Matter Physics
R.Q. Long、Ralph T. Yang1999-03-01The Journal of Physical Chemistry B
Rh-exchanged Al−MCM-41 is studied for selective catalytic reduction (SCR) of NO by C 3 H 6 in the presence of excess oxygen. It shows a high activity in converting NO to N 2 and N 2 O at low temperatures. In situ FT-IR studies indicate that Rh−NO + species (1910−1898 cm -1 ) is formed on the Rh−Al−MCM-41 catalyst in f…
Catalytic Processes in Materials ScienceMesoporous Materials and CatalysisAmmonia Synthesis and Nitrogen Reduction
C. Laurent1999-03-01IEEE Electrical Insulation Magazine
There is a need to better understand electrical ageing of solid insulating materials in dry environment and discharge-free conditions. Photons emitted by a stressed material give evidence of the generation of highly reactive molecular states that could control degradation reaction.
High voltage insulation and dielectric phenomenaPower Transformer Diagnostics and InsulationElectrostatic Discharge in Electronics
Sayed Mehdi Ghoreishi、Y. Li、J. F. Holzwarth 等 7 位作者1999-03-01Langmuir
The interaction between the dendrimers poly(1,4-diaminobutane) DAB n ( n = 8, 16, 32, 64) and poly(pyrrolidone-1,4-diaminobutane) DAB n Py ( n = 8, 16, 32) with the surfactants sodium dodecyl sulfate (SDS), tetradecyltrimethylammonium bromide (TTAB), and hexaethyleneglycol monododecyl ether (C 12 EO 6 ) have been stud…
RNA Interference and Gene DeliveryLuminescence and Fluorescent MaterialsDendrimers and Hyperbranched Polymers
Richard J. Kurtz、R.G. Hoagland、J. P. Hirth1999-03-01Philosophical magazine. A/Philosophical magazine. A. Physics of condensed matter. Structure, defects and mechanical properties
A computer simulation was performed to examine the role of extrinsic grain-boundary (GB) defects in the sliding of the {11, (101){131} symmetric tilt boundary in aluminium by means of an embedded-atom method potential. The sliding resistance of the equilibrium GB was determined from a computation of the dependence of…
Microstructure and mechanical propertiesMicrostructure and Mechanical Properties of SteelsHydrogen embrittlement and corrosion behaviors in metals
Yuxian An、Lixia Li、Lisong Dong 等 5 位作者1999-03-01Journal of Polymer Science Part B Polymer Physics
Nonisothermal crystallization and melting behavior of poly(β-hydroxybutyrate) (PHB)–poly(vinyl acetate) (PVAc) blends from the melt were investigated by differential scanning calorimetry using various cooling rates. The results show that crystallization of PHB from the melt in the PHB–PVAc blends depends greatly upon…
Polymer crystallization and propertiesPolymer Nanocomposites and Propertiesbiodegradable polymer synthesis and properties
Pierre-Cyrille Dugal、Michael A. Huels、Léon Sanche 等 4 位作者1999-03-01Radiation Research
Radiation-induced damage to homo-oligonucleotides is investigated by electron-stimulated desorption of neutral fragments from chemisorbed organic films. Six and 12 mers of cytidine phosphate (poly dCs) and thymidine phosphate (poly dTs) are chemisorbed from various solutions onto a crystalline gold substrate by a thio…
Advanced biosensing and bioanalysis techniquesMolecular Junctions and NanostructuresElectron and X-Ray Spectroscopy Techniques