Materials Literature
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Abstract 4,4′‐Oxydiphthalic anhydride (1) was reacted with L ‐leucine (2) in acetic acid and the resulting N , N ′‐(4,4′‐oxydiphthaloyl)‐bis‐ L ‐leucine diacid (4) was obtained in high yield. The direct polycondensation reaction of this diacid with several aromatic diols such as bisphenol A (5a), phenolphthalein (5b),…
Achnanthes was described by Bory to include three species, A. adnata, A. dubia and A. baccillarioides, formerly included under Echinella stipitata Lyngbye. Boyer typified the genus Achnanthes using A. adnata and this typification has been accepted by subsequent authors. However no extant material of A. adnata is known…
Abstract Ring‐opening polymerization (ROP) in supercritical carbon dioxide (scCO 2 ) has been the subject of much recent interest, although few publications describe the development of stabilizers to produce biodegradable particles of poly( L ‐lactide) (PLLA) and polyglycolide (PGA). Here we describe the synthesis of…
An approach for the entrapment of a polyanion by polyelectrolyte microcapsules is reported. It is based on a reversal changing of microcapsule wall permeability from neutral to basic pH. Polyelectrolyte microcapsules were templated on latex (polystyrene) particles by the layer-by-layer adsorption of oppositely charged…
We prepared several triblock copolymers of the A‒B‒C and A–C–B types composed of hydrophobic polystyrene (A), hydrophobic/lipophobic fluorinated polystyrene (B), and hydrophilic PEG-modified polystyrene (C) blocks with greatly varied degrees of polymerization. The resulting surface structure and organization of the po…
Shape memory alloys (SMA) have demonstrated their potential use in various smart structural applications. SMA undergo a reversible phase transformation from martensite to austenite as temperature increases. This transformation leads to shape recovery and to the associated recovery strains. SMA can also be used to enha…
The kinetics of the Fe-Mg intracrystalline exchange reaction in P2 1 /c pigeonite (Wo 10 En 47 Fs 43 ) free of exsolved augite, from the Paraná rhyodacite sample BTS308, was studied by single-crystal X-ray diffraction (XRD). Isothermal disordering annealing experiments, with oxygen fugacity controlled at the IW buffer…
The molecular weight, thermal stability, and conductivity of chemically synthesized, self-doped poly(anilineboronic acid) have been determined. Gel permeation chromatography results indicate a number-average molecular weight of 1 676 000 g mol -1, a weight-average molecular weight of 1 760 000 g mol -1, and a polydisp…
A preparation in the Ehrenberg Collection was designated as lectotype of Ceratoneis closterium Ehrenb., the type of the name of the genus Ceratoneis. The lectotype specimen was studied using the light microscopy and found to agree morphologically with recently studied material of taxa of the genus Cylindrotheca Rabenh…
The formation of micelles in a solvent that is selective for one of the blocks is one of the most important and useful properties of block copolymers. Recently, we have synthesized copolymers of polyethylene glycol and various dimethyl esters, which self‐assemble into nano micellar aggregates in aqueous media. These n…
The combined analysis of the space charge and electroluminescence (EL) in insulating polymers provides useful information on charge transport and energy dissipation. We are particularly interested in defining critical transport regimes leading to energy releases potentially harmful for the material. These critical reg…
Abstract The crystal structure, electronic states and VUV spectroscopic behaviour of Cs 2 KYF 6 doped with Pr 3+ ions have been investigated both by experimental and theoretical methods. Cs 2 KYF 6 ( ${\rm F}m{\bar 3}m$ , Z = 4, a = 945.5(3) pm, R1 all = 0.0297) crystallizes with the cubic elpasolite type of structure…
In the present study we have attempted to verify a theoretical model of grab versus strip strengths of fabrics [ Textile Research Journal, 2003, 73(2), 165–171] through experimental investigation. Five different fabrics were included in this study, and three related parameters were investigated including the modulus r…
RF diamond transistors have been developed on a hydrogen-terminated surface conductive layer. f T and f max of 23 and 25 GHz, respectively, have been achieved in a diamond MISFET with a 0.2 µm gate length. Utilizing de-embedding and small-signal equivalent circuit analysis, parasitic components are extracted. The intr…
Electrospray ionisation mass spectrometry (ESI-MS), electrospray ionisation tandem mass spectrometry (ESI-MS/MS) and Ultraviolet-visible (UV-vis) spectroscopy were used to investigate the non-covalent interactions between small oligonucleotide duplexes with the GC motif and a group of cationic meso(N-methylpyridynium-…
Abstract Summary: In this paper, we review recent studies on the morphology and molecular structure of some polysaccharide crystals from amylose, cellulose, and mannan. The data were recorded using combinations of imaging, diffraction, and spectroscopic techniques: scanning and transmission electron microscopy, electr…
The electronic structure of α, γ, and β phases of MgH2 is studied using the state of the art all-electron projector-augmented-wave GW approximation. Both the ground-state and the high-pressure transformations are considered in this investigation. We have found an indirect (direct) band gap of 5.58eV (6.52eV) for α-MgH…
Effects of low-acceleration-voltage (20 kV) electron irradiation damage in single-walled carbon nanotubes (SWNTs) were studied by in-situ electric measurements. The irradiation drastically decreased the conductivity for both metallic and semiconducting nanotubes due to the irradiation-induced damage. Intensive electro…
Our investigation of diamondlike-carbon (DLC) nanosprings with a 130-nm spring section diameter, which were fabricated by focused-ion-beam chemical vapor deposition (FIB-CVD), showed for the first time that nanosprings can be stretched. We observed large displacements of the FIB-CVD nanosprings in situ optical microsc…
Macroscopically oriented bulk organic−inorganic hybrid materials were cast from solutions subjected to hydrodynamic flow by utilizing a simple flow device. The hybrids were prepared from an amphiphilic diblock copolymer, poly(isoprene- block -ethylene oxide) (PI- b -PEO), used as a structure directing agent for organi…