Beat M. Bachmann、Dieter Seebàch1999-02-24Macromolecules
So far, it is known that various poly(3-hydroxybutanoate), PHB, depolymerases are able to degrade all -( R ) chains, cyclic ( R ) oligomers, oligolides, and polymers composed of rac -hydroxybutanoate, HB, but not all -( S ) or syndiotactic ( R, S ) chains. We have now studied the ability for configurational recognitio…
Enzyme Catalysis and Immobilizationbiodegradable polymer synthesis and propertiesEnzyme Structure and Function
Robert D. Deegan、Robert L. Leheny、Narayanan Menon 等 5 位作者1999-02-24The Journal of Physical Chemistry B
We have measured the shear modulus and viscosity of two supercooled liquids: tricresyl phosphate and squalane. In both cases we find that the width of the peak in the imaginary part of the shear modulus narrows as the temperature is lowered toward the glass transition temperature. For tricresyl phosphate, we find no e…
Liquid Crystal Research AdvancementsMaterial Dynamics and PropertiesThermodynamic properties of mixtures
Jerzy Lisowski、Przemysław Starynowicz1999-02-24Inorganic Chemistry
The macrocyclic [LnNiL]Cl3 complexes (Ln = LaIII, CeIII, PrIII, NdIII, SmIII, EuIII) contain both lanthanide and transition metal ions. The crystal structure of [LaNiL]Cl3 reveals a square planar environment of Ni(II) ion and an 8-coordinate, irregular coordination sphere of La(III) ion. The 1H and 13C NMR spectra of…
Organometallic Complex Synthesis and CatalysisMagnetism in coordination complexesLanthanide and Transition Metal Complexes
Hua‐Zhong Yu、Nan Xia、Zhongfan Liu1999-02-24Analytical Chemistry
Determination of the surface pK(a) of self-assembled monolayers (SAMs) at aqueous buffer/gold interfaces using surface-enhanced Raman scattering (SERS) measurements, namely, SERS titration, is reported for the first time. From the analysis of pH-dependent SERS spectra of 4-mercaptopyridine monolayers on gold, the pK(1…
Gold and Silver Nanoparticles Synthesis and ApplicationsQuantum Dots Synthesis And PropertiesElectrochemical Analysis and Applications
Jon D. Reuter、Andrzej Myc、Michael M. Hayes 等 11 位作者1999-02-24Bioconjugate Chemistry
Multiple sialic acid (SA) residues conjugated to a linear polyacrylamide backbone are more effective than monomeric SA at inhibiting influenza-induced agglutination of red blood cells. However, "polymeric inhibitors" based on polyacrylamide backbones are cytotoxic. Dendritic polymers offer a nontoxic alternative to po…
Immunotherapy and Immune ResponsesRNA Interference and Gene DeliveryDendrimers and Hyperbranched Polymers
Mitsutoshi Jikei、Sung-Hyun Chon、Masa‐aki Kakimoto 等 6 位作者1999-02-24Macromolecules
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTSynthesis of Hyperbranched Aromatic Polyamide from Aromatic Diamines and Trimesic AcidMitsutoshi Jikei, Sung-Hyun Chon, Masa-aki Kakimoto, Susumu Kawauchi, Tatsuya Imase, and Junji WatanebeView Author Information Department of Organ…
Chemical Synthesis and AnalysisDendrimers and Hyperbranched PolymersSynthesis and properties of polymers
Sophie Demoustier‐Champagne、Pierre-Yves Stavaux1999-02-24OpenAlex
Polypyrrole (PPy) with four different counterions was electrochemically synthesized in homemade polycarbonate particle track-etched membranes with different pore sizes. A dependence of the PPy growing rate on the pore size and on the electrolyte nature and concentration has been observed. The morphology of the differe…
Supercapacitor Materials and FabricationConducting polymers and applicationsSmart Materials for Construction
Christophe Petit、Abdelhafed Taleb、M. P. Piléni1999-02-24OpenAlex
Colloidal assemblies are used to synthesize FCC cobalt nanoparticles. The particles are coated, extracted from micelles, and characterized by transmission electron microscopy, small angle X-ray scattering, and electron and X-ray diffraction spectroscopy. These cobalt metal particles are stable in air, have a narrow si…
Gold and Silver Nanoparticles Synthesis and ApplicationsQuantum Dots Synthesis And Propertiesnanoparticles nucleation surface interactions
Mustapha Kaci、Sossio Cimmino、Maria Laura Di Lorenzo 等 5 位作者1999-02-23Journal of Macromolecular Science Part A
The aging of unstabilized low density polyethylene (LDPE) films and those stabilized with hindered amine light stabilizers (HALS) was studied as a function of the exposure time to thermo-oxidation at 90°C and to natural weathering. The HALS tested was Tinuvin 783 from Ciba-Geigy and added to the polymer in the concent…
Polymer crystallization and propertiesPolymer Nanocomposites and PropertiesPolymer Science and PVC
Núria López、Francesc Illas、Gianfranco Pacchioni1999-02-23The Journal of Physical Chemistry B
The nucleation of small Cu clusters at the surface of SiO 2 has been investigated by means of ab initio quantum chemical calculations using cluster models. The interaction of Cu n clusters ( n =1−5) with a nonbridging oxygen, NBO, a paramagnetic point defect of silica, has been studied by means of DFT calculations usi…
Advanced Chemical Physics StudiesCatalytic Processes in Materials ScienceCopper-based nanomaterials and applications
D. Das、S. Doniach1999-02-23arXiv
This paper aims to justify, at a microscopic level, the existence of a two-dimensional Bose metal, i.e. a metallic phase made out of Cooper pairs at T=0. To this end, we consider the physics of quantum phase fluctuations in (granular) superconductors in the absence of disorder and emphasise the role of two order param…
cond-mat.dis-nnMesoscale and Nanoscale PhysicsMaterials Sciencecond-mat.stat-mechStrongly Correlated Electrons
C. Thirstrup、M. Sakurai、T. Nakayama 等 4 位作者1999-02-23arXiv
The temperature dependence of hydrogen (H) desorption from Si(100) H-terminated surfaces by a scanning tunneling microscope (STM) is reported for negative sample bias. It is found that the STM induced H desorption rate ($R$) decreases several orders of magnitude when the substrate temperature is increased from 300 K t…
Materials Science
Prince Antony、S. K. De1999-02-22Journal of Applied Polymer Science
Ionomeric polyblends based on zinc salt of maleated EPDM rubber, abbreviated as Zn-mEPDM and zinc salt of poly(ethylene-co-acrylic acid), abbreviated as Zn-PEA in the compositions of 90/10, 80/20, 70/30, 60/40, and 50/50, parts by weight, behave as ionic thermoplastic elastomers. The ionomeric polyblends show synergis…
Polymer crystallization and propertiesPolymer Nanocomposites and Propertiesbiodegradable polymer synthesis and properties
Paul W. R. Bessonette、Mary Anne White1999-02-22The Journal of Chemical Physics
Although NaOH and NaOD exhibit parallel polymorphism at high temperatures, NaOD exhibits a low-temperature phase transition to a hydrogen-bonded antiferroelectric phase and no comparable transition has been found in NaOH. Measurements of NaOH by dielectric relaxation and adiabatic calorimetry were undertaken to determ…
Crystal Structures and PropertiesSpectroscopy and Quantum Chemical StudiesSolid-state spectroscopy and crystallography
L. Kielhorn、M. Muthukumar1999-02-22The Journal of Chemical Physics
We have derived a mean field Landau–Ginzburg free energy expression for a ternary symmetric homopolymer/diblock copolymer system from a microscopic Edwards Hamiltonian. We then used the time-dependent Landau–Ginzburg equation to model the time evolution of the order parameters after a critical quench into the region o…
Theoretical and Computational PhysicsRheology and Fluid Dynamics StudiesBlock Copolymer Self-Assembly
Shiming Geng、Jörg Friedrich、J. G�hde 等 4 位作者1999-02-22Journal of Applied Polymer Science
A thin film (<10 nm) of fine metal clusters (silver or gold) with an island form was deposited on a CaF2 salt plate by slow vacuum thermal evaporation. Molecular layers of stearic acid, p-nitrobenzoic acid, and m-nitrobenzoic acid (p- and m-NBA) were prepared on the thin metal film. The system was then examined by inf…
Gold and Silver Nanoparticles Synthesis and ApplicationsSurface Modification and SuperhydrophobicityIon-surface interactions and analysis
J. Im、Orlando Auciello、A.R. Krauss 等 7 位作者1999-02-22Applied Physics Letters
It is known that the forming gas (N2–H2 mixture) annealing process required for microcircuit fabrication results in an unacceptable electrical degradation of SrBi2Ta2O9 (SBT) ferroelectric capacitors due mainly to the interaction of H2 with the ferroelectric layer of the capacitor. We have found a strong relationship…
Ferroelectric and Piezoelectric MaterialsAcoustic Wave Resonator TechnologiesElectronic and Structural Properties of Oxides
Friedrich Esch、Alessandro Baraldi、C. Comelli 等 7 位作者1999-02-22The Journal of Chemical Physics
The interaction of NO with a flat and two stepped Rh(111) surfaces was studied at different temperatures by monitoring in situ the evolution of the O 1s and N 1s spectra during NO exposure using fast high resolution x-ray photoelectron spectroscopy. The O 1s and N 1s intensities and binding energies were used to finge…
Advanced Chemical Physics StudiesCatalytic Processes in Materials ScienceElectron and X-Ray Spectroscopy Techniques
Jaroslaw Knap、K. Sieradzki1999-02-22Physical Review Letters
We present results of molecular dynamic simulations aimed at examining crack tip dislocation emission in fcc solids. The results are analyzed in terms of recent continuum formulations of this problem. In mode II, Au, Pd, and Pt displayed a new unanticipated mechanism of crack tip dislocation emission involving the cre…
Advanced ceramic materials synthesisMicrostructure and mechanical propertiesElectronic Packaging and Soldering Technologies
A. Kanapitsas、P. Pissis、José Luís Gómez Ribelles 等 6 位作者1999-02-22Journal of Applied Polymer Science
The molecular mobility and hydration properties of model segmented polyurethanes from either poly(propylene glycol) (PPG) or poly(butylene adipate) (PBAD), both of molecular weight 2000 (soft segments), and three different diisocyanates (all-trans 4,4′-dicyclohexylmethane diisocyanate, 100% t,t HMDI; HMDI with 20% of…
Polymer crystallization and propertiesPolymer Nanocomposites and PropertiesPolymer composites and self-healing