Lia Addadi、Merav Geva2003-05-14CrystEngComm
An intimate historical and conceptual association exists between crystals and chirality. Yet the relationships between crystal symmetry and crystal morphology are not fully understood. In biological environments, molecular recognition between biological macromolecules and crystal surfaces can affect crystal morphologi…
Glycosylation and Glycoproteins ResearchEnzyme Structure and FunctionCrystallization and Solubility Studies
Hiroyuki Furuta、K. Youfu、Hiromitsu Maeda 等 4 位作者2003-05-14Angewandte Chemie International Edition
Confusion but no doubt: Two types of PtII dimer complexes of N-confused porphyrin (depicted) were synthesized and the structures were unequivocally elucidated by X-ray crystal analyses. Both complexes contain a metallocycle that binds to a Pt center by an outer-nitrogen atom of the confused porphyrin, and by an ortho-…
Metal complexes synthesis and propertiesMagnetism in coordination complexesPorphyrin and Phthalocyanine Chemistry
Shigeki Onoda、Naoto Nagaosa2003-05-14Physical Review Letters
The anomalous Hall effect due to the spin chirality order and fluctuation is studied theoretically in a Kondo lattice model without the relativistic spin-orbit interaction. Even without the correlations of the localized spins, ${\ensuremath{\sigma}}_{xy}$ can emerge depending on the lattice structure and the spin anis…
Magnetic properties of thin filmsMagnetic and transport properties of perovskites and related materialsAdvanced Condensed Matter Physics
Emmanuel Cadot、Marie‐Anne Pilette、Jérôme Marrot 等 4 位作者2003-05-14Angewandte Chemie International Edition
Fours for thought: The title compound was prepared by condensation of the preformed unit {Mo2O2S2}2+ as a linker on to the trivacant anion [α-P2W15O5]12−. The self-assembled structure exhibits a modular arrangement (see structure). 31P and 183W NMR spectroscopy revealed that the structure of the supramolecular tetra-u…
Metal-Organic Frameworks: Synthesis and ApplicationsPolyoxometalates: Synthesis and ApplicationsChemical Synthesis and Reactions
Yoshiaki Iizuka、M. Surianarayanan2003-05-14Industrial & Engineering Chemistry Research
This is the first comprehensive study on the kinetic modeling of adiabatic decomposition of di- tert -butyl peroxide (DTBP) and its solvent mixtures. The adiabatic thermal decomposition of DTBP and its solvent mixtures was examined using an accelerating rate calorimeter under varying thermal inertia. The decomposition…
Thermal and Kinetic AnalysisChemical Thermodynamics and Molecular StructureChemistry and Chemical Engineering
Sung In Moon、Thomas J. McCarthy2003-05-14Macromolecules
4253-4255
Polymer Surface Interaction StudiesAnodic Oxide Films and NanostructuresElectrophoretic Deposition in Materials Science
Sumit Banerjee、Ashwin Santhanam、Aruna Dhathathreyan 等 4 位作者2003-05-14Langmuir
An ordered hexagonal mesoporous nickel oxide was prepared for the first time using sodium dodecyl sulfate as the surfactant and urea as the hydrolyzing agent. The resulting oxide showed mesoporous structure with pore size ranging from 4 to 7 nm. Calcination at different temperatures was carried out, and the mesoporosi…
Metal-Organic Frameworks: Synthesis and ApplicationsMesoporous Materials and CatalysisPolyoxometalates: Synthesis and Applications
Makoto Kamo、Akihiko Tsuda、Yasuyuki Nakamura 等 7 位作者2003-05-14Organic Letters
[reaction: see text] Regioselectivity of the oxidative coupling of 5,10,15-triarylporphyrin metal complexes with DDQ-Sc(OTf)(3) was dependent on the central metal and meso-aryl substituent. Oxo-quinoidal porphyrin was obtained from Ni(II) porphyrin under the same conditions.
Photosynthetic Processes and MechanismsPorphyrin and Phthalocyanine ChemistrySurface Chemistry and Catalysis
Yasutomo Noishiki、Hiroko Takami、Yoshiharu Nishiyama 等 6 位作者2003-05-14Biomacromolecules
Crystal conversion of beta-chitin to alpha-chitin by aq. NaOH treatment was studied for a highly crystalline beta-chitin sample from diatom spine. The minimum NaOH concentration to cause swelling was between 25% and 30% w/w. The alkali-swollen material was poorly crystalline and was regenerated as alpha-chitin on wash…
Nanocomposite Films for Food PackagingPolysaccharides and Plant Cell WallsStudies on Chitinases and Chitosanases
Mary Christine Brick、Harvey J. Palmer、Thomas H. Whitesides2003-05-14Langmuir
This paper describes the preparation of colloidal dispersions of water-insoluble organic materials by a “solvent-shifting” procedure, in which a concentrated solution of an organic solute in a water-miscible organic solvent is dispersed into a large volume of aqueous (nonsolvent) bulk solution containing colloidal sta…
Material Dynamics and PropertiesSurfactants and Colloidal Systemsnanoparticles nucleation surface interactions
Jun Chen、Zhanliang Tao、Suo‐Long Li2003-05-14Angewandte Chemie International Edition
Filling the gaps: A low-temperature solution route was employed to successfully prepare multiwalled TiS2 nanotubes with open-ended tips (see HRTEM image). The as-prepared nanotubes could be intercalated with lithium atoms by treating a solution of the TiS2 nanotubes with nBuLi. The resulting homogeneous intercalated p…
Advancements in Battery Materials2D Materials and ApplicationsMXene and MAX Phase Materials
Jun Shan、Markus Nuopponen、Hua Jiang 等 5 位作者2003-05-14Macromolecules
The preparation of poly( N -isopropylacrylamide)-monolayer-protected clusters (PNIPAM-MPC) of gold nanoparticles was carried out in a homogeneous phase using three methods, in which three types of PNIPAM ligands were employed. The first type was comprised of PNIPAMs with narrow molar mass distributions, synthesized by…
Gold and Silver Nanoparticles Synthesis and ApplicationsPolymer Surface Interaction StudiesNanocluster Synthesis and Applications
Elizabeth A. Whitsitt、Andrew R. Barron2003-05-14Nano Letters
Single walled carbon nanotubes (SWNTs) have been coated with silica by the addition of a silica/H 2 SiF 6 solution to a surfactant-stabilized solution of SWNTs. The thickness of the coating is controlled by reaction time, while the coating of individual SWNTs versus small ropes is controlled by the choice of surfactan…
Carbon Nanotubes in CompositesGraphene research and applicationsSilicon Nanostructures and Photoluminescence
Eytan Katzav2003-05-14arXiv
I analyze the Nonlocal Conserved Kardar-Parisi-Zhang (NCKPZ) equation with spatially correlated noise. This equation is also known as the Nonlocal Molecular Beam Epitaxy (NMBE) equation andv was originally suggested to study the effect of the long-range nature of interactions coupled with spatially correlated noise on…
Materials Sciencecond-mat.stat-mech
I. Kaelin、Ch. Helm、G. Blatter2003-05-14arXiv
We study the effect of spatial dispersion of crystal modes on optical properties such as the reflectivity $R$. As an example for isotropic media, we investigate the simplest model for phonons in ionic crystals and compare with previous results for highly anisotropic plasmons, which are now understood from a more gener…
Materials Sciencephysics.optics
Sven P. Rudin、M. D. Jones、R. C. Albers2003-05-14arXiv
We have used a tight-binding model that is fit to first-principles electronic-structure calculations for titanium to calculate quasi-harmonic phonons and the Gibbs free energy of the hexagonal close-packed (hcp) and omega crystal structures. We show that the true zero-temperature ground-state is the omega structure, a…
Materials Science
Fabien Picaud、Alexander Smogunov、Andrea Dal Corso 等 4 位作者2003-05-14arXiv
The complex band structure of an isolated polyethylene chain is calculated within Density Functional Theory (DFT). A plane wave basis and ultrasoft pseudopotentials are used. The results are compared with those obtained via a local basis set. We obtain a gap between the highest occupied molecular orbilar (HOMO) and th…
Materials Science
G. De Marzi、H. J. Trodahl、J. Bok 等 5 位作者2003-05-14arXiv
We report on the first Raman data of Cu substituted La(1-y)Sr(y)Mn(1-x)Cu(x)O3 (0 < x < 0.10 and 0.17 < y < 0.3, accordingly in order to have the same Mn(4+)/[Mn(4+)+Mn(3+)] ratio), collected in the frequency range 100-900 cm-1 and at room temperature, with parallel and crossed polarizations of the incident and scatte…
Materials Science
T. Jarlborg2003-05-14arXiv
The T-dependence of magnetic moments in SrB_6 is studied through spin-polarized band calculations for a supercell of Sr_{27}B_{156} containing a B_6 vacancy. The magnetic moment decays rather quickly with T despite the fact that only electronic Fermi-Dirac effects are included. This result and the T-dependence of mome…
Materials Science
Shunai Che、Kristina Lund、Takashi Tatsumi 等 7 位作者2003-05-14Angewandte Chemie International Edition
No metal jacket required: The surface structures of mesoporous materials were accurately determined by using electron-microscopy techniques—without the need for metal plating. The effectiveness of these techniques was demonstrated with SBA-15 mesoporous silica (see image) and its CMK-5 carbon replica, for which high-r…
Catalytic Processes in Materials ScienceMesoporous Materials and CatalysisAerogels and thermal insulation