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Nanoporous Organosilicas: Periodic Materials Synthesized with Surfactant Templates in Acidic Media

Mark C. Burleigh、Michael A. Markowitz、Mark S. Spector 等 4 位作者2002-08-30The Journal of Physical Chemistry B

Nanoporous organosilicas have been synthesized by the acid-catalyzed hydrolysis and condensation of bis(triethoxysilyl)ethane (BTSE) using a hydrothermal approach. Cetyltrimethylammonium chloride (CTAC), polyoxyethylene(10) cetyl ether (Brij 56), and polyoxythylene(10) stearyl ether (Brij 76) were employed as structur…

Zeolite Catalysis and SynthesisMesoporous Materials and CatalysisPolyoxometalates: Synthesis and Applications

Determination of the next-nearest neighbor order in β phase in Cu-Al-Ni shape memory alloys

J.I. Pérez-Landazábal、V. Recarte、R. B. Pérez‐Sáez 等 6 位作者2002-08-30Applied Physics Letters

The metastable β phase undergoes two order–disorder transitions during quenching from high temperature in Cu-based shape memory alloys. First, it undergoes a B2 ordering at nearest neighbors and then a second one at next-nearest neighbors that has not been clearly established. Neutron powder diffraction measurements h…

Rare-earth and actinide compoundsShape Memory Alloy TransformationsX-ray Diffraction in Crystallography

Distinct Surface Morphologies of Electropolymerized Polymethylsiloxane Network Polypyrrole and Comonomer Films

Prasad Taranekar、Xiaowu Fan、Rigoberto C. Advíncula2002-08-30Langmuir

The electropolymerization of polysiloxane-functionalized pyrrole or poly(methyl-(undec-pyrrole-1-yl-decyl)-siloxane), to form conjugated network polymer films, is described. The “precursor polypyrrole” was electropolymerized using dynamic cyclic voltammetry (CV) on a flat conducting substrate electrode, resulting in c…

Advanced Sensor and Energy Harvesting MaterialsConducting polymers and applicationsAnalytical Chemistry and Sensors

Polarized ultraviolet Raman spectroscopy of β-Si3N4

Ralf Vogelgesang、M. Grimsditch、J. S. Wallace2002-08-30Journal of Applied Physics

We have studied single crystals of β-Si3N4 with polarization-resolved Raman spectroscopy in order to unambiguously obtain the symmetry character of zone center optical phonon modes. By applying ultraviolet excitation radiation, approaching resonance condition, we have overcome the usual difficulties with overwhelming…

Advanced ceramic materials synthesisSemiconductor materials and devicesGa2O3 and related materials

Polymer depletion interaction between a colloid particle and a wall: A Monte Carlo study

Andrey Milchev、Aniket Bhattacharya2002-08-30The Journal of Chemical Physics

An off-lattice bead–spring model of a polymer solution in a container with impenetrable walls is used to study the depletion interaction of a colloid particle with the planar wall by means of a Monte Carlo simulation. As expected, this interaction is found to depend essentially on the ratio ρ=R/Rg of the particle radi…

Phase Equilibria and ThermodynamicsMaterial Dynamics and PropertiesPickering emulsions and particle stabilization

Dielectric behavior and diffuse phase transition features of rare earth doped Sr0.61Ba0.39Nb2O6 ferroelectric ceramics

I. A. Santos、D. U. Spı́nola、D. Garcia 等 4 位作者2002-08-30Journal of Applied Physics

The dielectric behavior and the main features of the diffuse phase transition of nondoped and rare earth (La, Nd, or Gd) doped Sr0.61Ba0.39Nb2O6 relaxor ferroelectric ceramics were carefully investigated. The dopant incorporation gives rise to one continuous decrease of the temperatures of maximum dielectric permittiv…

Ferroelectric and Piezoelectric MaterialsMicrowave Dielectric Ceramics SynthesisDielectric properties of ceramics

Calculating the discrepancy between the Stokes and anti-Stokes RamanDband of carbon nanotubes using double resonance theory

Viktor Zólyomi、J. Kürti2002-08-30Physical review. B, Condensed matter

The correspondence between the Stokes and anti-Stokes Raman D band of graphitic materials in general, and bundles of single-wall carbon nanotubes (SWCNT's) in particular is investigated using the double resonance theory. The D band of bundles of SWCNT's is determined by the Van Hove singularity enhanced double-resonan…

Carbon Nanotubes in CompositesGraphene research and applicationsDiamond and Carbon-based Materials Research

Effects of surface treatments on the adhesion of Cu and Cr/Cu metallizations to a multifunctional photoresist

Jun Cong Ge、J.K. Kivilahti2002-08-30Journal of Applied Physics

The effects of chemical, plasma, and reactive ion etching (RIE) treatments on the adhesion of Cu and Cr/Cu to the multifunctional polymer were investigated. The adhesion was measured with the newly developed pull test. The polymer surfaces were characterized by the x-ray photoelectron spectroscopy, atomic force micros…

Semiconductor materials and devicesAdvanced Surface Polishing TechniquesCopper Interconnects and Reliability

Magnetocaloric effect and temperature coefficient of resistance of La2/3(Ca,Pb)1/3MnO3

Young Sun、M. B. Salamon、Seung‐Hyun Chun2002-08-30Journal of Applied Physics

The magnetocaloric effect of a La2/3(Ca,Pb)1/3MnO3 single crystal was examined. From the measurements of isothermal magnetization and heat capacity around the Curie temperature, we have calculated the maximum isothermal magnetic entropy change as ∼7.5 J/kg K and the adiabatic temperature changes as ∼5.6 K, near room t…

Magnetic and transport properties of perovskites and related materialsShape Memory Alloy TransformationsAdvanced Condensed Matter Physics

Thermodynamic Interactions in Organometallic Block Copolymers: Poly(styrene-block-ferrocenyldimethylsilane)

Hany Basam Eitouni、Nitash P. Balsara、Hyeok Hahn 等 5 位作者2002-08-30Macromolecules

The thermodynamic interactions in anionically synthesized poly(styrene- block -ferrocenyldimethylsilane) (SF) copolymers were examined using birefringence, small-angle X-ray and neutron scattering (SAXS and SANS). We show that birefringence detection of the order−disorder transition is possible in colored samples prov…

Fuel Cells and Related MaterialsBlock Copolymer Self-AssemblyMachine Learning in Materials Science

Aromatic polyamides derived from unsymmetrical diamines containing the phthalazinone moiety

Lin Cheng、Xi Gao Jian、Shi Zhen Mao2002-08-30Journal of Polymer Science Part A Polymer Chemistry

Abstract Two unsymmetrical and kink non‐coplanar heterocyclic diamines, 1,2‐dihydro‐2‐(4‐aminophenyl)‐4‐[4‐(4‐aminophenoxy)phenyl](2 H )phthalazin‐1‐one and 1,2‐dihydro‐2‐(4‐aminophenyl)‐4‐[4‐(4‐aminophenoxy)‐3,5‐dimethylphenyl](2 H ) phthalazin‐1‐one, were successfully synthesized by readily available heterocyclic bi…

Chemical Synthesis and AnalysisSynthesis and properties of polymersSynthesis and Characterization of Heterocyclic Compounds

Copolymers of ω-Pentadecalactone and Trimethylene Carbonate from Lipase Catalysis: Influence of Microstructure on Solid-State Properties

Maria Letizia Focarete、Massimo Gazzano、Mariastella Scandola 等 5 位作者2002-08-30Macromolecules

Unusual copolymers were prepared by Candida antarctica Lipase B (Novozyme-435) catalyzed copolymerization of ω-pentadecalactone (PDL) with trimethylene carbonate (TMC). Atypical solid-state properties were revealed by thermogravimetric analysis, differential scanning calorimetry (DSC), and X-ray diffraction analyses.…

Polymer Nanocomposites and Propertiesbiodegradable polymer synthesis and propertiesCarbon dioxide utilization in catalysis

Chain‐growth polycondensation of monomer consisting of two aromatic rings: Synthesis of well‐defined poly(ether sulfone) from 4‐fluoro‐4′‐hydroxydiphenyl sulfone

Tsutomu Yokozawa、Takahisa Taniguchi、Yukimitsu Suzuki 等 4 位作者2002-08-30Journal of Polymer Science Part A Polymer Chemistry

The polycondensation of 1a in the presence of 2 as an initiator and 18-crown-6 proceeded in a chain-polymerization manner in sulfolane at 120 °C to yield poly(ether sulfone) having defined molecular weights and low polydispersities.

Advanced Polymer Synthesis and CharacterizationDendrimers and Hyperbranched PolymersSynthesis and properties of polymers

Behavior of the shape memory alloy NiTi during one-dimensional shock loading

J. C. F. Millett、N. K. Bourne、G. T. Gray2002-08-30Journal of Applied Physics

The response of alloys based on the intermetallic compound NiTi to high-strain-rate and shock loading conditions has recently attracted attention. In particular, similarities between it, and other shape memory materials such as the alloy U–6%Nb in the propagation of the plastic wave in Taylor cylinders are of signific…

High-pressure geophysics and materialsShape Memory Alloy TransformationsHigh-Velocity Impact and Material Behavior

A Light Scattering Study of the Self-Assembly of Dendron Rod−Coil Molecules

Bérenger Gans、Simone Wiegand、Eugene R. Zubarev 等 4 位作者2002-08-30The Journal of Physical Chemistry B

Dendron rod−coil molecules are a novel supramolecular building block, comprising a dendritic unit, a rodlike unit, and a coil unit ( J. Am. Chem. Soc. 2001, 123, 4105). It was proposed that in solution these molecules assemble into ribbonlike aggregates of high aspect ratio. We report here on the self-assembly of DRC-…

Chemical Synthesis and AnalysisSupramolecular Self-Assembly in MaterialsDendrimers and Hyperbranched Polymers

Thermodynamics and Phase Behavior of Block Copolymer/Homopolymer Blends with Attractive and Repulsive Interactions

Joon‐Hyung Lee、Nitash P. Balsara、Arup K. Chakraborty 等 5 位作者2002-08-30Macromolecules

Small-angle neutron scattering (SANS) experiments were conducted on a 25 vol % blend of a poly(ethylene- block -head-to-head propylene) copolymer (PE−PP) in polyisobutylene (PIB). PE/PIB and PE/PP chains are incompatible (the Flory−Huggins interaction parameter χ > 0), while PIB and PP are compatible (χ < 0) at low te…

Advanced Polymer Synthesis and CharacterizationRheology and Fluid Dynamics StudiesBlock Copolymer Self-Assembly

Preparation of Multilayers Containing Conjugated Thiophene-Based Polyelectrolytes. Layer-by-Layer Assembly and Viscoelastic Properties

Jukka Lukkari、Mikko Salomäki、Timo Ääritalo 等 6 位作者2002-08-30Langmuir

We study the layer-by-layer assembly and properties of polyelectrolyte multilayers containing anionic and cationic poly(alkoxythiophene) derivatives, poly(3-(3‘-thienyloxy)propanesulfonate) (P3TOPS) and poly(3-(3‘-thienyloxy)propyltriethylammonium) (P3TOPA), together with poly(diallyldimethylammonium chloride) (PDADMA…

Polymer Surface Interaction StudiesMolecular Junctions and NanostructuresDendrimers and Hyperbranched Polymers

Nonorthogonal tight-binding model for germanium

Noam Bernstein、Michael J. Mehl、D. A. Papaconstantopoulos2002-08-30Physical review. B, Condensed matter

We present a pair of nonorthogonal tight-binding (TB) models for germanium within the NRL-TB approach. One uses an ${\mathrm{sp}}^{3}$ basis, and is optimized for total-energy calculations by fitting to the total energy and band structures of several high-symmetry lattice structures. The other uses an ${\mathrm{sp}}^{…

Boron and Carbon Nanomaterials ResearchSuperconductivity in MgB2 and AlloysElectronic and Structural Properties of Oxides

Influence of Molecular Organization of Asymmetrically Substituted Porphyrins on Their Response to NO2 Gas

José M. Pedrosa、Colin M. Dooling、T. Richardson 等 7 位作者2002-08-30Langmuir

Two asymmetrically substituted porphyrins (5,15-bis(4-nitrophenyl)-10,20-bis(3,4-bis(2-ethylhexyloxy)phenyl)-21 H,23 H -porphine, CAH3; 5,15-bis(4-aminophenyl)-10,20-bis(3,4-bis(2-ethylhexyloxy)phenyl)-21 H,23 H -porphine, CAH4) have been used in this work. Good Langmuir monolayers of these compounds have been prepare…

Lipid Membrane Structure and BehaviorPorphyrin and Phthalocyanine ChemistryLuminescence and Fluorescent Materials

Predicting water’s phase diagram and liquid-state anomalies

Thomas M. Truskett、Ken A. Dill2002-08-30The Journal of Chemical Physics

Water expands upon freezing, has minima in its volume, heat capacity, and isothermal compressibility with temperature, and shows signs of a first-order phase transition when supercooled. We present an analytical molecular theory that can account for these behaviors. It suggests that local network formation and hydroge…

Phase Equilibria and ThermodynamicsMaterial Dynamics and PropertiesSpectroscopy and Quantum Chemical Studies