Anima Bose、Pingang He、Charles Y. Liu 等 6 位作者2001-12-12Journal of the American Chemical Society
The reaction of methylviologen iodide with crystalline V2O5 in the molar ratio of 1 to 3.8 at 100 degrees C in water led to the formation of (MV)0.25V2O5 in quantitative yield. The structure of this organic-inorganic multilayered hybrid compound was determined by single-crystal X-ray crystallography. Strong van der Wa…
Porphyrin and Phthalocyanine ChemistryTransition Metal Oxide NanomaterialsPolyoxometalates: Synthesis and Applications
Yuji Miyazaki、Qi Wang、Akane Sato 等 8 位作者2001-12-12The Journal of Physical Chemistry B
Heat capacity of the halogen-bridged mixed-valence complex Pt 2 (dta) 4 I (dta = CH 3 CS 2 - ) has been measured in the temperature region between 6 and 386 K. The complex exhibited a phase transition of order−disorder type at T trs = 373.4 K, from being arranged in an ordered helical form of four dta ligand planes ar…
Magnetism in coordination complexesSpectroscopy and Quantum Chemical StudiesOrganic and Molecular Conductors Research
Dorian M. Hatch、Harold T. Stokes2001-12-12Physical review. B, Condensed matter
For a given group-subgroup transition, the complete set of order parameters, primary and secondary, describe the distortions that accompany this transition. The task of obtaining all order-parametric distortions for a group-subgroup pair is a long standing problem. An algorithm is presented here which obtains the irre…
Solid-state spectroscopy and crystallographyX-ray Diffraction in CrystallographyOptical and Acousto-Optic Technologies
Yehai Yan、Xianming Shi、Jinge Liu 等 5 位作者2001-12-12Journal of Applied Polymer Science
Abstract A thermosetting resin system for resin‐transfer molding based on novolak and bismaleimide (BMI) was developed. The novolak resin was allylated and BMI was used as the curing agent, and allyl phenyl ether, as the diluent. The viscosity–temperature curve and the viscosity–time curve were used to characterize th…
Epoxy Resin Curing ProcessesFiber-reinforced polymer compositesSynthesis and properties of polymers
Markus Biesalski、J. Rühe2001-12-12Macromolecules
We compare the swelling of surface-attached neutral poly(4-vinylpyridine) (PVP) and charged poly( N -methyl-4-vinylpyridinium iodide) (MePVP) brushes under good solvent conditions using multiple-angle null ellipsometry. The polymer layers were prepared by the “grafting from” technique, where a low molecular mass initi…
Polymer Surface Interaction StudiesMolecular Junctions and NanostructuresForce Microscopy Techniques and Applications
Janhavi P. Joshi、Rajeev Gupta、A. K. Sood 等 6 位作者2001-12-12Physical review. B, Condensed matter
We report electron paramagnetic resonance measurements on single crystalline and powder samples of ${\mathrm{Nd}}_{0.5}{\mathrm{Ca}}_{0.5}{\mathrm{MnO}}_{3}$ across the charge-ordering transition at ${T}_{\mathrm{co}}=240\mathrm{K}$ down to the antiferromagnetic ordering transition at ${T}_{N}=140\mathrm{K}.$ The chan…
Magnetic and transport properties of perovskites and related materialsAdvanced Condensed Matter PhysicsSolid-state spectroscopy and crystallography
Quan Du、Nicolas Carrasco、Marianna Teplova 等 6 位作者2001-12-12Journal of the American Chemical Society
We have developed a route for the synthesis of 2'-selenium uridine analogues and oligonucleotides containing selenium labels, and have demonstrated for the first time a new strategy to covalently derivatize nucleotides with selenium for phase and structure determination in X-ray crystallography.
DNA and Nucleic Acid ChemistryMass Spectrometry Techniques and ApplicationsEnzyme Structure and Function
Cuong Pham‐Huu、Nicolas Keller、Vladimir Roddatis 等 6 位作者2001-12-12Physical Chemistry Chemical Physics
A large scale synthesis of carbon nanofibers with a controlled diameter of about 50 nm has been achieved at relatively low temperatures (550–650 °C) by the decomposition of ethane on a carbon nanotube supported nickel catalyst. The carbon nanofibers can be used as a catalyst or a catalyst support without subsequent pu…
Carbon Nanotubes in CompositesGraphene research and applicationsSupercapacitor Materials and Fabrication
Jyh Ming Hwu、George J. Jiang、Zong Ming Gao 等 5 位作者2001-12-12Journal of Applied Polymer Science
Recently, polymer–clay hybrid materials have received considerable attention from both a fundamental research and application point of view.1–3 This organic–inorganic hybrid, which contains a nanoscale dispersion of the layered silicates, is a material with greatly improved physical and mechanical characteristics. The…
Polymer Nanocomposites and PropertiesConducting polymers and applicationsPolymer Nanocomposite Synthesis and Irradiation
Katsunori M. Shibata、Keishi Muto、Seiya Kobatake 等 4 位作者2001-12-12The Journal of Physical Chemistry A
Photocyclization and photocycloreversion quantum yields of three diarylethene derivatives were determined in the single-crystalline phase. The former yields in the crystalline phase were twice as large as those in solution. This can be attributed to only photoreactive antiparallel conformers being packed in the crysta…
Radical Photochemical ReactionsPhotochromic and Fluorescence ChemistryOrganic Chemistry Cycloaddition Reactions
Christos S. Garoufalis、Aristides D. Zdetsis、Stefan Grimme2001-12-12Physical Review Letters
Using state of the art time-dependent density functional theory and multireference second-order perturbation theory, we have accurately calculated (within 0.3 eV) in real space the optical gap of small silicon quantum dots, with diameters up to 25 A. Our results, which support the quantum confinement hypothesis, are i…
Semiconductor materials and devicesSilicon Nanostructures and PhotoluminescenceNanowire Synthesis and Applications
Dorota A. Pawlak、Masahiko Ito、Masaoki Oku 等 5 位作者2001-12-12The Journal of Physical Chemistry B
Mixed perovskites (AA‘)(BB‘)O 3, where A = La or Nd, A‘ = Sr, B = Al or Ga, and B‘ = Ta or Nb, were investigated by X-ray photoelectron spectroscopy (XPS). The interpretation of XPS O(1s) signals in mixed oxides is discussed. The nonsingular O(1s) peak that occurs in the mixed oxides is due to the polarization of the…
Luminescence Properties of Advanced MaterialsZeolite Catalysis and SynthesisNuclear materials and radiation effects
C. P. Ewels、M. I. Heggie、P. R. Briddon2001-12-12arXiv
We present a new and general mechanism for inter-conversion of carbon structures via a catalytic exchange process, which operates under conditions of Frenkel pair generation. The mechanism typically lowers reaction barriers by a factor of four compared to equivilent uncatalysed reactions. We examine the relevance of t…
Materials Science
A. Korotkov、M. Bowman、H. J. McGuinness 等 4 位作者2001-12-12arXiv
We describe a method for creating atomic-scale electric contacts. A metal source is deposited on two insulating substrates separated by a 70 nm gap. Electric conductance across the gap is monitored, while protrusions from the bulk extend into the gap and reach corresponding protrusions on the other side of the gap. Wh…
Mesoscale and Nanoscale PhysicsMaterials Science
Peter Van2001-12-12arXiv
The variational approach to weakly nonlocal thermodynamic theories is critically revisited in the light of modern nonequilibrium thermodynamics. The example of Ginzburg-Landau equation is investigated in detail.
Materials Sciencecond-mat.stat-mech
Yves Nöel、Claudio M. Zicovich‐Wilson、Bartolomeo Civalleri 等 5 位作者2001-12-12Physical review. B, Condensed matter
The spontaneous polarization and the piezoelectric constants of ZnO and BeO are calculated at an ab initio quantum-mechanical level by using two alternative strategies, namely, through the Berry phase scheme applied to delocalized crystalline orbitals, and through the definition of well-localized Wannier functions. Th…
Advanced Chemical Physics StudiesAcoustic Wave Resonator TechnologiesBoron and Carbon Nanomaterials Research
Moosung Lee、Won Ho Park2001-12-11Journal of Polymer Science Part A Polymer Chemistry
Abstract Poly(3‐hydroxybutyrate) (PHB)/poly(glycidyl methacrylate) (PGMA) blends were prepared by a solution‐precipitation procedure. The compatibility and thermal decomposition behavior of the PHB/PGMA blends was studied with differential scanning calorimetry, thermogravimetric analysis, and differential thermal anal…
Polymer crystallization and propertiesbiodegradable polymer synthesis and propertiesCarbon dioxide utilization in catalysis
Qi Fang Li、Ming Tian、Dong Gil Kim 等 5 位作者2001-12-11Journal of Applied Polymer Science
Abstract Supertough nylon 11 is prepared by using a plasticizer. The influence of plasticizers on the impact property and tensile properties of plasticized nylon 11 were investigated. The results show that the impact strength is improved remarkably by methylbenzene sulfonamide, and the tensile strength is almost the s…
Polymer crystallization and propertiesPolymer Nanocomposites and Propertiesbiodegradable polymer synthesis and properties
Cheng‐Jang Tsai、Yun Chen2001-12-11Journal of Polymer Science Part A Polymer Chemistry
Abstract A novel synthetic procedure for the preparation of poly(oxadiazole)s was developed with nucleophilic substitution of α,ω‐alkanediols with oxadiazole‐activated bisfluoride. Seven poly(oxadiazole)s were successfully prepared by the solution polymerization of 2,5‐bis(4‐fluorophenyl)‐1,3,4‐oxadiazole and various…
Liquid Crystal Research AdvancementsPolymer Nanocomposites and PropertiesSynthesis and Properties of Aromatic Compounds
Hao‐Shiung Chang、Tzi‐Yi Wu、Yun Chen2001-12-11Journal of Applied Polymer Science
Abstract A series of new thermotropic main‐chain liquid crystalline copolyesters were prepared by polycondensation of 2,6‐naphthalenedicarbonyl chloride, 4,4′‐thiodiphenol, and α,ω‐alkanediols ( n = 4–10) in diphenyl ether at 200°C. Thermal transition behaviors of these copolyesters were investigated by differential s…
Liquid Crystal Research AdvancementsSynthesis and Properties of Aromatic CompoundsSynthesis and properties of polymers