Ultrathin layers and supramolecular architecture of isopentylcellulose
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Materials Literature
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Dynamic Light Scattering from Dilute, Semidilute, and Concentrated Block Copolymer Solutions
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDynamic Light Scattering from Dilute, Semidilute, and Concentrated Block Copolymer SolutionsC. Pan, W. Maurer, Z. Liu, T. P. Lodge, P. Stepanek, E. D. von Meerwall, and H. WatanabeCite this: Macromolecules 1995, 28, 5, 1643–1653Publication Date (Print):February 1, 1995Public…
Effects of Shear on the Smectic A Phase of Thermotropic Liquid Crystals
The rheological behaviour of the smectic A phase of the thermotropic liquid crystal 4-cyano-4'-octylbiphenyl (8CB) is examined. X-ray scattering studies under shear flow were performed to probe changes of structures. We found that in a certain range of temperatures two states of orientation of lamellae exist. These tw…
Does Adsorption on the Surface of a Silver Colloid Perturb Drug/DNA Interactions? Comparative SERS, FT-SERS, and Resonance Raman Study of Mitoxantrone and Its Derivatives
International audience
Immittance Response of La0.6Sr0.4Co0.2Fe0.8 O 3 Based Electrochemical Cells
The ac small‐signal response of La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3 (LSCF) is examined via lumped parameter/complex plane analysis (LP/CPA) technique. The ac data, acquired in the frequency range 10 − 1 ≤ f ≤ 10 6 Hz , are used to establish the role of ionic contribution in the LSCF material system using a two‐terminal bl…
Improvement of blood compatibility on cellulose dialysis membrane. III. Synthesis and performance of water‐soluble cellulose grafted with phospholipid polymer as coating material on cellulose dialysis membrane
To improve the surface blood compatibility on a cellulose hemodialysis membrane, a blood compatible polymer with a phospholipid polar group, poly[2-methacryloyloxyethyl phosphorylcholine(MPC)], was immobilized on the surface through the coating of a water-soluble cellulose grafted with poly(MPC) (MPC-grafted cellulose…
Changes in the mechanical properties of dermal sheep collagen during in vitro degradation
The changes in tensile strength, elongation at break, and high strain modulus of dermal sheep collagen (DSC) during in vitro degradation using bacterial collagenase were studied. The changes in mechanical properties were compared with the change in weight of the samples as a function of degradation time. DSC was cross…
Single-Source Precursors of Lead Titanate: Synthesis, Molecular Structure and Reactivity of Pb2Ti2(.mu.4-O)(.mu.3-O-i-Pr)2(.mu.-O-i-Pr)4(O-i-Pr)4
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSingle-Source Precursors of Lead Titanate: Synthesis, Molecular Structure and Reactivity of Pb2Ti2(.mu.4-O)(.mu.3-O-i-Pr)2(.mu.-O-i-Pr)4(O-i-Pr)4Stephane Daniele, Renee Papiernik, Liliane G. Hubert-Pfalzgraf, Susan Jagner, and Mikael HakanssonCite this: Inorg. Chem. 1995, 34…
Diamond single crystals: the ultimate monochromator material for high-power x-ray beams
A review of the performance of diamond single crystals as a high heat load optical component for synchrotron x rays is given. It has been proven experimentally that the bandpass and the angular divergence of the monochromatic beam provided by a relatively thin diamond crystal used in an undulator beam are not degraded…
Human monocyte/macrophage adhesion and cytokine production on surface‐modified poly(tetrafluoroethylene/hexafluoropropylene) polymers with and without protein preadsorption
To study surface property-dependent human monocyte adhesion and cytokine (IL-1 beta, IL-6, TNF-alpha) production, poly(tetrafluoroethylene/hexafluoropropylene) (FEP) polymer was modified to exhibit neutral, anionic, or cationic properties by incorporating amide (CONH2) and/or carboxyl (COOH) or aminoethyl amide [CONH(…
Time-Domain Electron Paramagnetic Resonance as a Probe of Electron-Electron Spin-Spin Interaction in Spin-Labeled Low-Spin Iron Porphyrins
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTime-Domain Electron Paramagnetic Resonance as a Probe of Electron-Electron Spin-Spin Interaction in Spin-Labeled Low-Spin Iron PorphyrinsMargaret H. Rakowsky, Kundalika M. More, Alexander V. Kulikov, Gareth R. Eaton, and Sandra S. EatonCite this: J. Am. Chem. Soc. 1995, 117…
Structure of Adsorbed Polymer Layers: Loops and Tails
The structure of an adsorbed polymer layer in equilibrium with a dilute good solvent is considered theoretically. It is shown that under saturation conditions the tails of the polymer chains give an important contribution to the monomer density profile in the outer layer away from the wall: the tail contribution domin…
Surface Composition of a Series of Dimethylsiloxane Urea Urethane Segmented Copolymers Studied by Electron Spectroscopy for Chemical Analysis
Surface composition of a series of segmented poly(siloxane urea urethane)'s have been determined by angle- and energy-dependent ESCA. The polymers are based on aminopropyl end-capped dimethylsiloxane oligomers, isophorone diisocyanate and 1,4-benzene dimethanol. Effects of segmental length and annealing on the surface…
Scalar Relativistic Effects on 17O NMR Chemical Shifts in Transition-Metal Oxo Complexes. An ab Initio ECP/DFT Study
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTScalar Relativistic Effects on 17O NMR Chemical Shifts in Transition-Metal Oxo Complexes. An ab Initio ECP/DFT StudyMartin Kaupp, Vladimir G. Malkin, Olga L. Malkina, and Dennis R. SalahubCite this: J. Am. Chem. Soc. 1995, 117, 6, 1851–1852Publication Date (Print):February 1…
Strained SrTiO3/BaTiO3 Superlattices Formed by Laser Ablation Technique and Their High Dielectric Properties
Artificial dielectric superlattices of SrTiO 3 /BaTiO 3 (STO/BTO) have been formed by a pulsed laser ablation technique with in situ monitoring of reflection high-energy electron diffraction (RHEED) oscillation. The superlattices with a stacking periodicity of a few unit cells show higher dielectric constant than that…
In-situobservation of dislocation motion in icosahedral Al-Pd-Mn single quasicrystals
The plastic deformation of icosahedral Al-Pd-Mn single quasicrystals has been studied by in situ straining experiments in a high-voltage electron microscope at elevated temperatures. The results provide the first direct evidence for dislocation motion in quasicrystals. The dislocation velocity, for an applied stress o…
Electron and x-ray fluorescence yield measurements of the Cu L2,3-edge x-ray absorption fine structures: A comparative study
The Cu L2,3-edge x-ray absorption fine structures (XAFS) of a series of Cu samples have been recorded at the BL1A beamline of UVSOR using both electron yield and x-ray fluorescence yield techniques. XAFS measurements were simultaneously recorded in three modes: total electron yield (TEY) with specimen current, total e…
Temperature effect on impact fracture toughness and fracture mechanism of phenolphthalein poly(ether ketone)
Abstract Phenolphthalein poly(ether ketone) (PEK‐C) was tested using an instrumented impact tester to determine the temperature effect on the fracture toughness K c and critical strain energy release rate G c . Two different mechanisms, namely the relaxation processes and thermal blunting of the crack tip were used to…
Synthesis, Properties, and Structures of 1,2 : 5,6-Bis(ethylenedithio)pyracylene and Its Radical Cation Salts
Abstract 1,2 : 5,6-Bis(ethylenedithio)pyracylene (2) was synthesized as an example of molecular design for a polyaromatic condensed-type donor with two ethylenedithio groups at the periphery. The redox potential of 2 indicates that this heterocycle is a reversible two-stage redox system with low oxidation potentials,…
High temperature polymer blends: an overview of the literature
Abstract A review of work which has been performed on high temperature polymer blends is presented. The discussion is divided into miscible and immiscible blends. It is pointed out that one problem with miscible polymer blends is that of processing in the miscible state. In the case of immiscible blends, particularly…