Structure and properties of porous hypercrosslinked polystyrene sorbents Styrosorb
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Icosahedral, Decagonal and Amorphous Phases in Al–Cu–M (M=Transition Metal) Systems
Rapidly solidified phases in Al–Cu–M ternary alloys ranging from 15 to 20 at%Cu and 10 to 20%M were found to change, with the group number of transition metal M, in the sequence of an amorphous phase for Y, La, Ti, Hf or V, followed by an icosahedral (I) phase for Cr, Mn, Fe, Ru or Os, a decagonal (D) phase for Co or…
Centrosymmetric crystals as host matrices for second-order optical nonlinear effects
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCentrosymmetric crystals as host matrices for second-order optical nonlinear effectsI. Weissbuch, M. Lahav, L. Leiserowitz, G. R. Meredith, and H. VanherzeeleCite this: Chem. Mater. 1989, 1, 1, 114–118Publication Date (Print):January 1, 1989Publication History Published onli…
Polydispersity in liquid crystal systems
Here we discuss the statistical mechanics of polydisperse liquid crystal systems. Three different kinds of liquid crystal systems are treated: nematic order in thermotropic Maier-Saupe-like systems and in lyotropic Onsager-like rod systems, and smectic order in a perfectly aligned hard rod fluid. In the first two case…
Metallotexaphyrins: a new family of photosensitisers for efficient generation of singlet oxygen
The photophysical properties of a new series of tripyrroledimethine-derived ‘expanded porphyrins’(‘texaphyrins’) are reported; these compounds show strong low energy optical absorptions in the 730–770 nm spectral range as well as a high triplet quantum yield, and act as efficient photosensitizers for the production of…
Charge transfer in conducting polymers. Striving toward intrinsic properties
A principal goal of the field of conducting polymers is to strive for advances in materials quality that will enable the exploration of the intrinsic electrical properties. In this context, we summarize the requirements for achieving high performance conducting polymers with electrical conductivities greater than that…
Synthesis of substituted pyrroles via zirconocene complexes of imines
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of substituted pyrroles via zirconocene complexes of iminesStephen L. Buchwald, M. Woods Wannamaker, and Brett T. WatsonCite this: J. Am. Chem. Soc. 1989, 111, 2, 776–777Publication Date (Print):January 1, 1989Publication History Published online1 May 2002Published…
The effect of incorporated negative fixed charges on the membrane properties of polypyrrole films
Polypyrrole (PPy) and poly-N-methylpyrrole (PMPy) films have been prepared on electrodes in NaCl, polystyrenesulphonate (PSS), and dodecylsulphate (ROSO3–) electrolytes. The redox-switching of these coatings has been studied, mainly in NaCl electrolytes. At various electrode potentials the coated electrodes were withd…
Synthesis of Bis(ethylenedithio)tetrathiafulvalene (BEDT-TTF)
All articles of this category 2-Oxo-5,6-dihydro-1,3-dithiolo[4,5- b ][1,4]dithiin ( 4 ) was prepared in four steps from cheap starting materials in high overall yield. Coupling of 4 with trimethyl phosphite in toluene gave bis(ethylenedithio)tetrathiafulvalene ( 5 ; BEDT-TTF; 2,2′-bi-5,6-dihydro-1,3-dithiolo[4.5- b ][…
Voltammetric studies of the redox behaviour of various multivalent ions in soda-lime-silica glass melts
Etude de la voltametrie a onde carree et comparaison de cette technique a la voltametrie cyclique. Application a plusieurs elements a valence multiple et determination de leurs potentiels normaux en fonction de la temperature
Poly-(R)-3-hydroxybutyrate (PHB) biosynthesis: mechanistic studies on the biological Claisen condensation catalyzed by β-ketoacyl thiolase
Abstract
Structural and Stereochemical Relations Between Acidic Macromolecules of Organic Matrices and Crystals
Detailed studies of the molecular organization of various mineralized tissues highlight the role played by acidic glycoproteins in controlling crystal formation. In vitro experiments show that these macromolecules are able to interact with specific faces of different crystals, influencing both nucleation and crystal g…
Backscatter Kikuchi diffraction in the SEM for identification of crystallographic point groups
Abstract A preliminary account is given of the application of backscatter Kikuchi diffraction patterns (BKP) to point group determination in the SEM. Studies carried out on bulk specimens selected from the 32‐point groups indicate that 27 of the 32‐point groups can be determined unambiguously using BKPs, though distin…
The New Physical Optics Notebook: Tutorials in Fourier Optics
Approaches the topic of physical optics with examples drawn from the physical processes described. Includes chapters on Fourier transforms, image formation, optical coherence, diffraction, interference, holography, interferometry, analog optical computing, synthetic aperture imaging, and others. Contains more than 600…
Invited Lecture. New results on the electrohydrodynamic instability in nematics
We present theoretical results on the threshold and near-threshold behaviour of electrohydrodynamic convection of planarly aligned nematics under D.C. and A.C. driving. We use the general three dimensional description and include the flexoelectric effect. The experimentally established threshold behaviour is captured…
Picosecond time-resolved measurements of crystallization in noble metals
Crystallization rates in pure metals have been measured by monitoring changes in reflectivity on a picosecond time scale during pulsed laser quenching. Multilayered films were used to establish that the transient decreases in reflectivity correspond to melting. Depth profiling with Auger electron spectroscopy on laser…
Broadband dielectric spectroscopy on side group liquid crystal polymers
Dielectric studies on three liquid-crystalline side group polymers were performed in the temperature range from 100 K to 450 K and in the frequency range from 10−1 Hz to 107 Hz. All samples exhibit an α relaxation with a WLF dependence of the activation energy as well as a β relaxation, which are comparable in the gla…
Surface molecular mobility and platelet reactivity of segmented poly(etherurethaneureas) with hydrophilic and hydrophobic soft segment components
Segmented poly(etherurethaneureas) (SPUUs) with hydrophilic and hydrophobic polyether components were prepared. The surface chemical composition of SPUUs in various environments was investigated by means of X-ray photoelectron spectroscopic and dynamic contact angle measurements. These measurements revealed that in a…
Cross-Linking and Stereospecific Structure of Collagen in Mineralized and Nonmineralized Skeletal Tissues
Molecular distributions of the intermolecular cross-links in fetal bovine bone type I collagen fibrils were quantitatively determined and compared with those of periodontal ligament. Results indicated that Hyl and Lys residues in the COOH-terminal nonhelical peptide portions (residues 16C) of both alpha 1 chains were…
Frustration and helicity in the ordered phases of a discotic compound
We have used X-ray diffraction to study the discotic mesophases D hd and Dho and the low temperature crystalline K phase of hexa(hexylthio)triphenylene. The high-temperature liquid crystalline Dhd phase is composed of a two-dimensional triangular array of columns, with short range intracolumn order. The intermediate-t…