John K. Grey、Ian S. Butler、Christian Reber2003-09-06Inorganic Chemistry
The luminescence properties of thiocyanate and selenocyanate platinum(II) and palladium(II) complexes show strong variations with temperature and pressure. The d-d luminescence band maxima for [Pt(SCN)(4)](PPh(4))(2) (1), [Pt(SCN)(4)](n-Bu(4)N)(2) (2), and [Pt(SeCN)(4)](n-Bu(4)N)(2) (4) complexes are centered at ca. 1…
Magnetism in coordination complexesLanthanide and Transition Metal ComplexesOrganic and Molecular Conductors Research
Ettore Fois、Aldo Gamba、Gloria Tabacchi 等 5 位作者2003-09-06The Journal of Physical Chemistry B
Ab initio molecular dynamics simulations on 1-nm thick slabs of amorphous silica have been carried out in order to mimic the local properties of mesoporous materials framework. A number of defects have been considered, both with closed and open shell electronic structure, and their spectroscopic properties analyzed an…
Glass properties and applicationsMesoporous Materials and CatalysisSilicon Nanostructures and Photoluminescence
Jai A. Pathak、Kalman B. Migler2003-09-06Langmuir
We have performed experiments on model emulsions of polyisobutylene (PIB) and poly(dimethylsiloxane) (PDMS) to quantify the effect of confinement on deformation and stability under flow of droplets and strings (threads). It is known from earlier work from our group that, under confinement, droplets in concentrated emu…
Surface Modification and SuperhydrophobicityAdvanced Sensor and Energy Harvesting MaterialsPolymer crystallization and properties
Fiorenzo Vetrone、John‐Christopher Boyer、John A. Capobianco 等 5 位作者2003-09-06The Journal of Physical Chemistry B
The near-infrared to visible upconversion properties of nanocrystalline Gd 3 Ga 5 O 12:Er 3+ (1 and 5%) were studied following excitation of the 4 I 9/2 exited state with 800 nm radiation. Intense green and red emissions were observed from the ( 2 H 11/2, 4 S 3/2 ) → 4 I 15/2 and 4 F 9/2 → 4 I 15/2 transitions, respec…
Luminescence Properties of Advanced MaterialsPerovskite Materials and ApplicationsNuclear materials and radiation effects
Galia Maayan、Richard H. Fish、Ronny Neumann2003-09-06Organic Letters
[reaction: see text] Polyfluorinated quaternary ammonium cations, [CF(3)(CF(2))(7)(CH(2))(3)](3)CH(3)N(+) (R(F)N(+)), were synthesized and used as countercations for the [WZnM(2)(H(2)O)(2)(ZnW(9)O(34))(2)](12)(-) (M = Mn(II), Zn(II)) polyoxometalate. The (R(F)N(+))(12)[WZnM(2)(H(2)O)(2)(ZnW(9)O(34))(2)] compounds were…
Polyoxometalates: Synthesis and ApplicationsChemical Synthesis and ReactionsOxidative Organic Chemistry Reactions
Tetsuo Okutsu、Kazuhiko Nakamura、Hiroshi Haneda 等 4 位作者2003-09-06Crystal Growth & Design
Laser-induced precipitation and crystal growth were observed by an irradiation of benzophenone in an ethanol and water mixed solvent. The crystal was composed of benzopinacol produced from excited benzophenone through a benzophenone ketyl radical. Polyhedral, skeletal, and dendrite morphologies of benzopinacol were co…
Spectroscopy and Quantum Chemical StudiesCrystallization and Solubility Studiesnanoparticles nucleation surface interactions
Guodong Zheng、Harald D. H. Stöver2003-09-06Macromolecules
We report the ring-opening polymerization (ROP) of ε-caprolactone catalyzed by Al(Et) 3 and Al[OCH(CH 3 ) 2 ] 3 from lightly cross-linked poly(DVB80- co -HEMA) microspheres. The resulting poly(ε-caprolactone) grafted particles with active propagating ends were converted to macroinitiators for ATRP and used further to…
Advanced Polymer Synthesis and Characterizationbiodegradable polymer synthesis and propertiesPolymer Surface Interaction Studies
Jean‐Pierre Costes、Françoise Dahan、Franck Nicodème2003-09-06Inorganic Chemistry
The stepwise course of the synthesis of homo- (4f, 4f) and heterodilanthanide (4f, 4f ') complexes has been investigated through structural determination of the intermediate and final products occurring in the process. In the first step, the tripodal ligand H(3)L is reacted with Ln(NO(3))(3) x 5H(2)O to give a complex…
Supramolecular Chemistry and ComplexesMagnetism in coordination complexesLanthanide and Transition Metal Complexes
Dragana Neradovic、Mies J. van Steenbergen、L. Vansteelant 等 6 位作者2003-09-06Macromolecules
Diblock copolymers of poly( N -isopropylacrylamide- co - N -(2-hydroxypropyl)methacrylamide lactate) (poly(NIPAAm- co -HPMAm-lactate)) as a thermosensitive block and poly(ethylene glycol) (PEG) as a hydrophilic block form polymeric micelles above the cloud point (CP) of the temperature-sensitive block. Destabilization…
Hydrogels: synthesis, properties, applicationsAdvanced Polymer Synthesis and Characterizationbiodegradable polymer synthesis and properties
Hiromitsu Maeda、Yuichi Ishikawa、Tomoyuki Matsuda 等 5 位作者2003-09-06Journal of the American Chemical Society
The square-planar structure of a diamagnetic Cu(III) complex of tetrakis(pentafluorophenyl)-substituted N-confused porphyrin was elucidated by X-ray diffraction analysis. The facile interconversion between Cu(II) (1) and Cu(III) (2) complexes was achieved by chemical oxidation/reduction, and the Cu(III)/Cu(II) redox p…
Molecular Sensors and Ion DetectionSupramolecular Chemistry and ComplexesPorphyrin and Phthalocyanine Chemistry
R. G. Hennig、D. R. Trinkle、J. Bouchet 等 6 位作者2003-09-06arXiv
The onset and kinetics of martensitic transformations are controlled by impurities trapped during the transformation. For the alpha to omega transformation in Ti, ab initio methods yield the changes in both the relative stability of and energy barrier between the phases. Using the recently discovered transformation pa…
Materials Science
Dongho Kim、Atsuhiro Osuka2003-09-06The Journal of Physical Chemistry A
A variety of porphyrin arrays connected by diverse linkers have been envisaged and prepared for the applications in molecular photonics and electronics. From a viewpoint of operational requirements, the porphyrin arrays should have the very regular pigment arrangements which allow a facile light energy or charge flow…
Organic Electronics and PhotovoltaicsPorphyrin and Phthalocyanine ChemistryMolecular Junctions and Nanostructures
Larken E. Euliss、Stephanie G. Grancharov、Stephen O’Brien 等 7 位作者2003-09-06OpenAlex
We demonstrate that highly crystalline, monodisperse maghemite (γ-Fe 2 O 3 ) nanoparticles, synthesized in organic solvents, can be effectively transferred into an aqueous medium using an ammonium salt and stabilized at neutral pH. The nanoparticles remain monodisperse, as characterized by TEM and XRD, as well as supe…
Nanoparticle-Based Drug DeliverySurfactants and Colloidal SystemsPolymer Surface Interaction Studies
Darrin J. Pochan、Joel P. Schneider、Juliana K. Kretsinger 等 6 位作者2003-09-06OpenAlex
A small de novo designed peptide (MAX3) is described that exhibits complete thermoreversible self-assembly into a hydrogel network. Importantly, a prerequisite to hydrogelation is that the peptide must first fold into a conformation conducive to self-assembly. At ambient temperature, MAX3 is unfolded, resulting in a l…
Glycosylation and Glycoproteins ResearchChemical Synthesis and AnalysisSupramolecular Self-Assembly in Materials
David L. Tomasko、Hongbo Li、Dehua Liu 等 7 位作者2003-09-06OpenAlex
The use of supercritical carbon dioxide as a processing solvent for the physical processing of polymeric materials is reviewed. Fundamental properties of CO 2 /polymer systems are discussed with an emphasis on available data and measurement techniques, the development of theory or models for a particular property, and…
Phase Equilibria and ThermodynamicsInjection Molding Process and PropertiesPolymer Foaming and Composites
Atsushi Shimojima、Kazuyuki Kuroda2003-09-05Angewandte Chemie
Hybride auf Kieselgelbasis mit lamellaren oder hexagonalen Strukturen entstehen direkt aus neuartigen Alkylsiloxan-Oligomeren 1. Diese Selbstorganisations-Strategie öffnet einen Zugang zu geordnetem mikroporösem Kieselgel und mesostrukturierten kieselgelbasierten Hybridmaterialien (siehe Schema: 1. Hydrolyse und Polyk…
Mesoporous Materials and CatalysisPolyoxometalates: Synthesis and ApplicationsSilicone and Siloxane Chemistry
C. Cashell、David Sutton、D. Corcoran 等 4 位作者2003-09-05Crystal Growth & Design
We have used a variety of microscopy and spectroscopy techniques to study the crystal interior of l -glutamic acid ( l -Glu) during a solvent-mediated polymorphic transformation process. Remarkably, we have found the encapsulation of the stable form of l -Glu within the metastable form. In particular, we have verified…
Enzyme Structure and FunctionCrystallization and Solubility StudiesFood Chemistry and Fat Analysis
Simon Petrie、Robert Stranger、W. W. Duley2003-09-05The Astrophysical Journal
We report B-LYP/6-31G* and B3-LYP/6-31G* density functional theory calculations on a set of polycyclic hydrocarbons, ranging in size from C 19 H 22 to C 36 H 32 , combining aromatic (unsaturated) and aliphatic (saturated, sp 3 -hybridized carbon) ring systems. These locally aromatic polycyclic hydrocarbons (LAPHs), ge…
Astrophysics and Star Formation StudiesDiamond and Carbon-based Materials ResearchFullerene Chemistry and Applications
Ayumi Minoguchi、Kei Kitai、Ryusuke Nozaki2003-09-05Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics
Complex permittivity measurements were performed on sorbitol, xylitol, and sorbitol-xylitol mixture in the supercooled liquid state in an extremely wide frequency range from 10 microHz to 500 MHz at temperatures near and above the glass transition temperature. We determined detailed behavior of the relaxation paramete…
Liquid Crystal Research AdvancementsMaterial Dynamics and PropertiesThermodynamic properties of mixtures
Changwook Kim、Kwanyong Seo、Bongsoo Kim 等 7 位作者2003-09-05Physical review. B, Condensed matter
We investigated the electronic structures of chemically modified carbon nanotube tips under electric fields using density functional calculations. Hydrogen, oxygen, and hydroxyl group-terminated nanotubes have been considered as field emitters or probe tips. In the case of the open-ended tubes, the field emission orig…
Carbon Nanotubes in CompositesForce Microscopy Techniques and ApplicationsMechanical and Optical Resonators