Jongsub Moon、Gilju Yi、Chil Hwan Oh 等 6 位作者2002-02-06Physiological Measurement
The evaluation of skin surface contours can be carried out by various techniques, including the use of a stylus profilometer, a laserprofilometer and a conventional optical profilometer (COP). But these methods have some drawbacks because their data are basically obtained from two-dimensional algorithms. So a new tech…
Skin Protection and AgingTextile materials and evaluationsColor Science and Applications
E. Mulazzi、A. Ripamonti、Laurence Athouël 等 5 位作者2002-02-06Physical review. B, Condensed matter
We present an experimental and theoretical investigation of the optical absorption and Raman spectra of electropolymerized poly(para-phenylene) (PPP) and related oligomers. Experimental data include also the photoluminescence spectra of all these polymeric compounds. Theoretical calculations of the band shapes of both…
Organic Electronics and PhotovoltaicsConducting polymers and applicationsAnalytical Chemistry and Sensors
Luis A. Pérez‐Maqueda、J. M. Criado、F.J. Gotor2002-02-06International Journal of Chemical Kinetics
Abstract A quadrupole mass spectrometer coupled to a thermobalance has been used to develop a controlled rate thermal analysis (CRTA) equipment. This instrument maintains constant the partial pressure of the gas generated in a solid–gas reaction during the entire process while recording the weight loss along the proce…
Energetic Materials and CombustionThermal and Kinetic AnalysisChemical Thermodynamics and Molecular Structure
N. Gabriel Lemcoff、Benzion Fuchs2002-02-06Organic Letters
[structure: see text] A new approach to polyacetal systems using sequential transacetalation and protection-deprotection techniques was developed for the preparation of macromolecular polyacetals and applied to secure new dendrimers with 2,4,8,10-tetraoxaspiro[5,5]undecane dendrons from pentaerythritol and polyaldehyd…
Advanced Polymer Synthesis and CharacterizationChemical Synthesis and AnalysisDendrimers and Hyperbranched Polymers
Jean‐Jacques Gaumet、Gregory A. Khitrov、Geoffrey F. Strouse2002-02-06Nano Letters
Electrospray ionization (ESI) mass spectrometry is a soft-ionization technique that allows analysis of exact structure, composition, and stability of solution phase materials by a gas-phase technique. We describe the application of ESI techniques for the analysis of a nanoscale material, [Cd 32 S 14 (SC 6 H 5 ) 36 ·DM…
Quantum Dots Synthesis And PropertiesChalcogenide Semiconductor Thin FilmsNanocluster Synthesis and Applications
D. F. de Sousa、Ronan Lebullenger、Antônio Carlos Hernandes 等 4 位作者2002-02-06Physical review. B, Condensed matter
The energy migration ${}^{3}{\mathrm{H}}_{4}{,}^{3}{\mathrm{H}}_{6}\ensuremath{\rightarrow}{\mathrm{H}}_{4}{,}^{3}{\mathrm{H}}_{6}$ and the cross relaxation ${}^{3}{\mathrm{H}}_{4}{,}^{3}{\stackrel{\ensuremath{\rightarrow}}{{\mathrm{H}}_{6}}}^{3}{\mathrm{F}}_{4}{,}^{3}{\mathrm{F}}_{4}$ between ${\mathrm{Tm}}^{3+}$ ion…
Luminescence Properties of Advanced MaterialsGlass properties and applicationsLanthanide and Transition Metal Complexes
Önder Pekcan、N. Adiyaman、Ş. Uğur2002-02-06Journal of Applied Polymer Science
Abstract Nonradiative energy transfer method was used to study latex film formation induced by organic solvent vapor. Seven different films with the same latex content were prepared separately from poly(methyl methacrylate) (PMMA) particles and exposed to ethyl benzene, toluene, chloroform, dichloromethane, tetrahydro…
Polymer crystallization and propertiesRheology and Fluid Dynamics StudiesPolymer Science and PVC
Amit K. Naskar、Anil K. Bhowmick、S. K. De2002-02-06Journal of Applied Polymer Science
Abstract Chlorinated ground rubber tire (Cl‐GRT) particles were used as filler in a plasticized polyvinylchloride (PVC) to develop a melt‐processable rubber composition. Physical properties of the Cl‐GRT‐filled PVC compound showed improvement compared to the nonchlorinated counterpart. Interaction between Cl‐GRT and P…
Polymer crystallization and propertiesPolymer Nanocomposites and PropertiesPolymer Science and PVC
Daniel Wolfgang Wyrwa、Norbert Beyer、Günter Schmid2002-02-06Nano Letters
A promising route to strictly one-dimensional arrangements of Au 55 (PPh 3 ) 12 Cl 6 clusters is described. On the basis of the successful generation of ordered two-dimensional cluster architectures by self-assembly processes at the phase boundary between water and dichloromethane, the formation of single cluster rows…
Gold and Silver Nanoparticles Synthesis and ApplicationsNanocluster Synthesis and ApplicationsAdvanced Nanomaterials in Catalysis
Luís Ibarra、M. Alzorriz2002-02-06Journal of Applied Polymer Science
Abstract The properties of ionic elastomers formed in the crosslinking with zinc peroxide are studied in compounds with varying proportions of carboxylic groups in the elastomeric matrix. At the temperature used, 150°C, preferentially ionic bonds were formed. The crosslinking densities and, correspondingly, the physic…
Polymer Nanocomposites and Propertiesbiodegradable polymer synthesis and propertiesDielectric materials and actuators
Xiaolin Wang、M. R. James、J. Horvat 等 4 位作者2002-02-06Superconductor Science and Technology
La2CoMnO6 perovskite manganite was synthesized by solid-state reaction. Rietveld refinement of powder x-ray diffraction data indicated that this compound crystallized with an orthorhombic structure containing distorted (Co/Mn)O6 octahedra (Pnma; a = 5.5 A; b = 7.2 A; c = 5.4 A. The dc magnetization and real part (x')…
Magnetic and transport properties of perovskites and related materialsMultiferroics and related materialsAdvanced Condensed Matter Physics
Ornulf Rexin、Rolf Mülhaupt2002-02-06Journal of Polymer Science Part A Polymer Chemistry
Abstract Anionic ring‐opening polymerization of propylene oxide in the presence of potassium alcoholate initiator was accelerated by addition of the bulky phosphonium salt tetrakis[cyclohexyl(methyl)amino]phosphonium‐tetrafluoroborate. Dipropylene glycol (DPG) was partially deprotonated (5%) and used as an initiator f…
biodegradable polymer synthesis and propertiesFlame retardant materials and propertiesCarbon dioxide utilization in catalysis
Carme Rovira、Juan J. Novoa、José-Luís Mozos 等 5 位作者2002-02-06Physical review. B, Condensed matter
The electronic structure of the molecular solid $\mathrm{Ni}(\mathrm{tmdt}{)}_{2},$ the only well characterized neutral molecular metal to date, has been studied by means of first-principles density functional calculations. It is shown that these calculations correctly describe the metallic vs semiconducting behavior…
Magnetism in coordination complexesMolecular Junctions and NanostructuresOrganic and Molecular Conductors Research
J. Ern、Arthur Thomas Bens、Hans‐Dieter Martin 等 6 位作者2002-02-06The Journal of Physical Chemistry A
The influence of a bulky, strongly coupled substituent (benzoyl−phenyl−ethenyl, BPE) on the dynamics of the photoinduced ring-closure and ring-opening reactions of 1,2-bis[[2−methyl−thien−3−yl]]perfluorocyclopentene (BMTFP) in solution was investigated. UV/vis absorption spectroscopy in combination with chemical actin…
Photochromic and Fluorescence ChemistryPhotoreceptor and optogenetics researchOrganic Chemistry Cycloaddition Reactions
Jian Feng Jin、Yong Ling Chen、De Ning Wang 等 7 位作者2002-02-06Journal of Applied Polymer Science
Abstract Rosin‐based polyester polyols were synthesized from a rosin–maleic anhydride adduct, diethylene glycol, and ethylene glycol with and without adding adipic acid and phthelic anhydride, in the presence of catalyst. Rigid polyurethane (PU) foams were prepared with these rosin‐based polyols and compared with foam…
Polymer composites and self-healingCarbon dioxide utilization in catalysisThermal and Kinetic Analysis
Gerdenis Kodis、Paul A. Liddell、Linda de la Garza 等 8 位作者2002-02-06The Journal of Physical Chemistry A
A highly efficient functional mimic of a photosynthetic antenna−reaction center complex has been designed, synthesized, and studied spectroscopically. The antenna, consisting of four covalently linked zinc tetraarylporphyrins, (P ZP ) 3 −P ZC, has been coupled to a free-base porphyrin−fullerene artificial photosynthet…
Photosynthetic Processes and MechanismsPorphyrin and Phthalocyanine ChemistryPhotochemistry and Electron Transfer Studies
Fabiana R. Gonçalves e Silva、Oscar L. Malta、Christine Reinhard 等 7 位作者2002-02-06The Journal of Physical Chemistry A
The photophysical properties of the triple-stranded dimetallic helicates [Ln 2 (L C −2H) 3 ]·H 2 O (Ln = Nd, Sm, Dy, Yb) are determined in water and D 2 O solutions, and energy transfer processes are modeled for Sm III . The luminescence of Nd III, Sm III, and Yb III is sensitized by (L C −2H) 2-, but the energy trans…
Luminescence Properties of Advanced MaterialsMagnetism in coordination complexesLanthanide and Transition Metal Complexes
Matthew Myers、Eric F. Connor、Thierry Glauser 等 6 位作者2002-02-06Journal of Polymer Science Part A Polymer Chemistry
Abstract A new metal‐free synthetic approach to the controlled ring‐opening polymerization (ROP) of lactide with nucleophilic phosphines as transesterification catalysts is described. P(Bu) 3 , PhPMe 2 , Ph 2 PMe, PPh 3 , and related phosphines are commercially available, inexpensive catalysts that generate narrowly d…
Organometallic Complex Synthesis and Catalysisbiodegradable polymer synthesis and propertiesCarbon dioxide utilization in catalysis
Yan Hu、Yun Gao、De Ning Wang 等 7 位作者2002-02-06Journal of Applied Polymer Science
Abstract A new kind of polyol based on rape seed oil for use in rigid polyurethane foam was synthesized and characterized. The synthesis of such a polyol was divided into two steps. The first step was the hydroxylation of the double bonds existing in the long chains of the unsaturated aliphatic hydrocarbon of rape see…
Polymer composites and self-healing
O. Chubykalo、R. Smirnov-Rueda、M. A. Wongsam 等 6 位作者2002-02-06arXiv
The question how to introduce thermal fluctuations in the equation of motion of a magnetic system is addressed. Using the approach of the fluctuation-dissipation theorem we calculate the properties of the noise for both, the fluctuating field and fluctuating torque (force) representation. In contrast to earlier calcul…
Materials Sciencecond-mat.stat-mech