Existence for an Allen-Cahn/Cahn-Hilliard system with degenerate mobility
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Contrast Variation Small-Angle Neutron Scattering Study of the Structure of Block Copolymer Micelles in a Slightly Selective Solvent at Semidilute Concentrations
The structure of micelles of an asymmetric polystyrene−polyisoprene (PS−PI) diblock copolymer has been studied in di- n -butyl phthalate (DBP), which is a slightly selective solvent for PS. The polymer has a molecular weight of 11 500 for the fully deuterated d -PS block and 48 500 for the PI block. Contrast variation…
Construction of Artificial Photosynthetic Reaction Centers on a Protein Surface: Vectorial, Multistep, and Proton-Coupled Electron Transfer for Long-Lived Charge Separation
Artificial photosynthetic reaction centers have been constructed on a protein surface by cofactor reconstitution, which mimic the function of photosynthetic organisms to convert light energy to chemical potential in the form of long-lived charge-separated states. They feature a ruthenium tris(2,2‘-bipyridine) moiety a…
Chiral Hyperbranched Dendron Analogues
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTChiral Hyperbranched Dendron AnaloguesAlexander Sunder, Rolf Mülhaupt, Rainer Haag, and Holger FreyView Author Information Freiburger Materialforschungszentrum FMF und Institut für Makromolekulare Chemie der Albert-Ludwigs-Universit…
Synthesis, Morphology, and Mechanical Properties of Poly(methyl methacrylate)-b-poly(n-butyl acrylate)-b-poly(methyl methacrylate) Triblocks. Ligated Anionic Polymerization vs Atom Transfer Radical Polymerization
Poly(methyl methacrylate)- b -poly( n -butyl acrylate)- b -poly(methyl methacrylate) triblock copolymers have been prepared by ligated anionic polymerization (LAP; 8K-50K-8K) and atom transfer radical polymerization (ATRP; 9K-51K-9K). Size exclusion chromatography, nuclear magnetic resonance, and differential scanning…
Large Third-Order Electronic Polarizability of a Conjugated Porphyrin Polymer
Degenerate four-wave mixing measurements, using 45 ps pulses at 1064 nm, have been used to determine the magnitude of the third-order optical susceptibility tensor for thin films of a conjugated porphyrin polymer. The time dependence of the signals indicates that the dominant response is fast relative to the duration…
Silver Growth on TiO2(110) (1 × 1) and (1 × 2)
The growth and interaction of Ag with the TiO 2 (110) (1 × 1) and (1 × 2) surfaces were studied by X-ray photoemission spectroscopy (XPS), low-energy ion scattering (LEIS), low-energy electron diffraction (LEED), and scanning tunneling microscopy (STM). At 300 K, both LEIS and STM data indicate that Ag grows three-dim…
Direct Observation of the “Pac-Man” Effect from Dibenzofuran-Bridged Cofacial Bisporphyrins
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTDirect Observation of the "Pac-Man" Effect from Dibenzofuran-Bridged Cofacial BisporphyrinsYongqi Deng, Christopher J. Chang, and Daniel G. NoceraView Author Information Department of Chemistry, 6-335 Massachusetts Institute of Technology 77 Massachusetts Avenue Cambri…
Microphase Separation and Rheological Properties of Polyurethane Melts. 2. Effect of Block Incompatibility on the Microstructure
This second paper in this series regarding the relationship between structure and viscoelastic properties of multiblock polyurethane elastomers presents the results of varying segmental incompatibility at fixed segment length and composition. Three series of amorphous polyurethanes with pendant trimethylammonium group…
Energy barriers for diffusion on stepped Rh(111) surfaces
Energy barriers for different moves of a single Rh adatom in the vicinity of steps on Rh(111) surface are studied with molecular statics. Interatomic interactions are modeled by the semi-empirical many-body Rosato-Guillope-Legrand potential. We calculate systematically barriers for the descent at straight steps, steps…
DNA-Linked Metal Nanosphere Materials: Structural Basis for the Optical Properties
The structural basis for the aggregation-induced optical properties of colloidal gold nanosphere aggregates is examined by means of electrodynamics calculations. Recently developed methods for calculating the electrodynamic response of aggregates composed of large numbers of small metal nanospheres in a dielectric med…
Biomaterials in Drug Delivery and Tissue Engineering: One Laboratory's Experience
This Account reviews our laboratory's research in biomaterials. In one area, drug delivery, we discuss the development of materials that are capable of releasing macromolecules such as proteins and peptides, intelligent delivery systems based on magnetism or microchip technology, new degradable materials such as polya…
Collective Dynamics of Polymer Brushes
Dynamics of poly(ethylene oxide)−polystyrene (PEO−PS) brushes with shorter anchoring PEO blocks adsorbed on a flat surface are considered theoretically. Three relaxation modes are identified: a fast cooperative (hydrodynamic) mode, a slower drag mode, and the slowest anchor-sliding mode. It is shown that the anchor mo…
A finite-volume method for deformation analysis of woven fabrics
Efficient numerical methods for simulating cloth deformations have been identified as the key to the development of successful Computer-Aided Design systems for clothing products. This paper presents the formulation of a new finite-volume method for the simulation of complex deformations of initially flat woven fabric…
Distribuição espacial e temporal da Biomassa Fitoplanctônica relacionada com Parâmetros Hidrológicos na Bacia do Pina (Recife – PE).
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Color Control in Sulfide Phosphors: Turning up the Light for Electroluminescent Displays
Manipulation of the defect chemistry in ZnS:Mn and SrS:Cu bulk and thin-film phosphors has resulted in specific and controllable emission colors across the entire visible spectrum. Saturated red emission is observed at exceptionally low threshold voltages in ac thin-film electroluminescent devices, while unsurpassed l…
Electrospray ionisation tandem mass spectrometry of poly [(R,S)-3-hydroxybutanoic acid] telechelics containing primary hydroxy end groups
Evaluation of polymer end-capping reactions with the aid of electrospray ionisation tandem mass spectrometry techniques (ESI-MS(n)) allows characterisation of novel poly[(R, S)-3-hydroxybutanoic acid]-(a-PHB) telechelics, containing primary hydroxyl groups at both polymer chain ends. The chemical structures of individ…
Localization of Residual Water in Alkali-Metal Cation-Exchanged X and Y Type Zeolites
The arrangements of residual water and alkali-metal cations in zeolites Y and X have been determined by Rietveld refinement in combination with Fourier analysis of X-ray powder patterns. The sodium forms NaY and NaX as well as partially cation exchanged forms MNaY and MNaX (M = K, Rb, Cs) were studied. It was shown th…
Thermally-Induced Phase Separation Mechanism Study for Membrane Formation
The thermally-induced phase separation mechanism was investigated for the system isotactic polypropylene and diphenyl ether. Droplet growth was monitored by using a thermo-optical microscope. The degree of supercooling for liquid-liquid phase separation affected the size and growth rate of the droplets. Increasing the…
<title>Projecting the performance of erbium-doped fiber devices in a space radiation environment</title>
The optical attenuation induced in two erbium-doped fibers by <SUP>60</SUP>Co (gamma) -ray exposures to 200 krad has been measured at 3 different dose rates, approximately, 35, 1000, and 20,500 rad/min. The growth of the induced loss was measured at 980, 1300, and 1500 nm. In some instances recovery of the loss after…