Materials Literature
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Liquid crystals composed of photoactive groups, such as azobenzene, are promising materials for optical switching and image storage applications. On exposure to light LC materials commonly undergo an order-to disorder transition. Here, an unusual disorder-to-order transition is presented (the Figure shows a photo-indu…
A novel and simple synthetic method for the preparation of aragonite whiskers has been developed, whereby aqueous solutions of CaCl2 and Na2CO3 are combined in the presence of a suitable surfactant, poly(ethylene glycol)-20 000 (abbreviated as PEG), under ambient reaction conditions. The whiskers have high aspect rati…
Crosslinked samples of cis-1,4-polybutadiene (BR) were crystallized at low temperatures and then slowly melted. From volume changes and differential scanning calorimetry measurements, the degree of crystallization in the unstrained state was estimated to be about 20%, much lower than for natural rubber (NR). Crystalli…
A series of Gd-DO3A derivatives (8a–d) mimicking phospholipids have been prepared. Two of the complexes, Gd-HADB-DO3A (8a) and Gd-HADO-DO3A (8b), have been evaluated as pH responsive MRI contrast agents in vitro. The T1-relaxivity (r1) of Gd-HADO-DO3A (8b) increased 142% on changing the pH from 6 to 8. The pH dependen…
A magnetic suspension balance was used to measure solubility of CO 2 in PMMA in the temperature range 0 to 167 ° C and at pressures to 61.2 atm. CO 2 dissolves to considerable extent in PMMA, reaching a value of about 30 wt% at 0 ° C and 34 atm. Diffusion coefficients, derived from the sorption kinetics, were analyzed…
The properties of CdO films formed by low-pressure chemical vapor deposition were investigated as a function of deposition temperatures from 150-450°C. Atomic force microscopy, X-ray diffraction, and transmission electron microscopy revealed that the grain size, bulk crystallinity, and intragrain quality all improved…
The structures of Sr2FeO3F, Sr2FeO3Cl and Sr2FeO3Br have been investigated using powder neutron diffraction (PND). All three ferrates crystallise in the primitive tetragonal space group P4/nmm and the anions are fully ordered giving iron oxygen square pyramids separated by rock salt type layers of strontium halide. 57…
In this study, dual compatibilizers composed of the commercially available maleic anhydride-grafted polypropylene (PP–MA) and a multifunctional epoxy resin were demonstrated to effectively compatibilize the immiscible and incompatible blends of PP and poly(butylene terephthalate) (PBT). The PP–MA with a low MA content…
An azobenzene-containing gelator can gel the nematic liquid crystal BL006 through self-assembly of hydrogen-bonded aggregates. Due to the high nematic–isotropic transition temperature of BL006, the gelation occurs either in the isotropic or the nematic phase depending on the concentration of the gelator. Prior to the…
This paper describes the implementation of real-space torsion-angle refinement as a tool for model (re)building. The algorithmic details and parameterization for a number of different protocols are presented, as well as the handling of special conditions. Examples illustrating the use of the algorithms show that these…
The preparation and characterizations of new hybrid organic–inorganic nanocomposites consisting of acrylonitrile–butadiene–styrene terpolymer and a Na+-exchanged montmorillonite (MMT) are described by direct intercalation through one-step emulsion polymerization. Those products were purified by successive hot acetone…
A new magnesium alloy strengthened by icosahedral quasicrystalline particles and precipitates was developed by thermomechanical processes for an as-cast Mg-rich Mg95Zn4.3Y0.7 alloy. Quasicrystalline particles of 0.5–2 \\micron in size were distributed in the α-Mg matrix by the hot-rolling process, and nanoscale quasic…
We applied dynamic light scattering technique on the model system of hen egg lysozyme in salt-free aqueous ethanol solution to study the mechanism of denaturation and aggregation of protein. At low ethanol concentration [0-63% (v/v)], the fast relaxation mode was observed, which was caused by lysozyme molecules in the…
This work describes a new strategy for the preparation of hyperbranched polymers from commercially available A2 and BB′2 type monomers without any catalysts; the rapid reaction of A groups with B groups results in the formation of dimers that can be regarded as a new sort of AB′2 type monomer; further polymerization o…
The absorption and scattering of light by silver and gold nanoparticles and their aggregates provides a powerful mechanism for detecting important molecules in a variety of applications. The authors describe recent advances in determining nanoparticle optical properties using computational electromagnetics.
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Efficient syntheses are reported for tetraiodotetrathiafulvalene 2, 4-iodo-5-methyl-4′,5′-bis(methylsulfanyl)TTF 3, and 4-iodo-4′,5′-bis(methylsulfanyl)TTF 4 by iodination, using perfluorohexyl iodide, of lithiated derivatives of the corresponding TTF system. Bromination and chlorination of lithiotrimethylTTF using 1,…
This paper presents a generalized 2-D tensor finite element model, which can be used to evaluate force components in electromagnetic devices including those due to the magnetostrictive phenomenon. Magnetostriction is a property of ferrous alloys in which the material will exhibit strain in the presence of magnetic fie…
Corrosion products formed on copper plates exposed in urban, rural/coastal, and hot spring areas in Japan were characterized by X-ray photoelectron spectroscopy, X-ray diffraction (XRD), and coulometric reduction. The exposure tests were carried out for a month in summer. XRD patterns showed that hydrated copper sulfa…
Poly[(3,4-ethylenedioxy)pyrrole-2,5-diyl] (PEDOP) and poly[(3,4-propylenedioxy)pyrrole-2,5-diyl] (PProDOP) were synthesized by in situ chemical polymerization yielding highly transmissive, conductive and electroactive thin films. PProDOP coatings exhibit a surface resistivity of 16 kΩ □−1 at 60% and 58 kΩ □−1 at 99.9%…