Materials Literature
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We report the morphology and phase behaviors of binary blends of polystyrene- block -polyisoprene (SI) copolymers, which were studied by a small-angle X-ray scattering (SAXS) technique. The neat SI copolymers employed in this study have almost the same molecular weights but different volume fractions of polystyrene bl…
A mesoporous MCM-48 membrane with high thermal stability has been synthesized on a porous stainless steel support by hydrothermal treatment.
The new precursors [Ti(OPri)3(OCH2CH2NMe2)] 1 and [Ti(OPri)2(OCH2CH2NMe2)2] 2 have been prepared and characterised. Compound 1 exists in solution at room temperature as a mixture of monomer and dimer(s), however at elevated temperatures the monomer predominates. Compound 2 exists in solution predominantly as a monomer…
We present ${}^{139}\mathrm{La}$ NMR experiments on five powder samples of lanthanum manganites, with a ${\mathrm{Mn}}^{4+}$ concentration ranging from the antiferromagnetic-insulator (AFM) to the ferromagnetic-conducting (FM) region of the phase diagram. We measure a positive hyperfine coupling $\mathcal{C}=0.13 \mat…
Bis- and tris(aminoxyl) radicals and di(4-pyridyl)diazomethane form crystalline complexes with extended structures upon reaction with [M(hfac)2] (M=MnII or CuII, and hfac=hexafluoroacetylacetonate). Organic 2p and metal 3d spins in these complexes order at 3.4–46 K depending on the dimensions of the extended structure…
In the presence of templating anions, 2:3 molar mixtures of triphos and silver(I) cations unexpectedly give novel hexanuclear cages, which result from an unusual ‘endo-methyl’ geometry of the triphos ligands.
Pure silica MCM-48 is prepared by a novel synthesis method, using the [C 18 H 37 N + (CH 3 ) 2 −(CH 2 ) 12 −N + (CH 3 ) 2 C 18 H 37 ]·2Br - surfactant, abbreviated as GEMINI 18-12-18. The MCM-48, obtained after careful calcination, is a highly crystalline, mesoporous material with the characteristics of the Ia 3 d cub…
We report the incorporation of a new trifunctionalized disperse red-type chromophore into a polyurethane thermosetting system. Six polymers with different chromophore loading and NCO/OH ratios were synthesized. This system exhibited very good poling efficiencies, and the optimum chromophore loading density ranged from…
A new route for the synthesis of Si- and Si-Ti-MCM-48 has been developed which allows these materials to be obtained without using polar organic additives and alkali metal ions; this procedure not only produces more active and selective Ti-MCM-48 oxidation catalysts than those reported before, but also permits the syn…
Three 1-O-methyl-4, 6-O-benzylidene derivatives of monosaccharides (D-glucose, D-galactose and D-mannose) were synthesised: they acted as versatile gelators of various organic fluids, indicating that saccharides are useful as potential building-blocks for molecular design of chiral gelators.
A potentially more cost‐efficient method of growing single‐crystal relaxor‐based ferroelectric materials has been investigated. Seed single crystals of Pb(Mg 1/3 Nb 2/3 )O 3 (PMN)—;35 mol% PbTiO 3 (PT) were embedded within polycrystalline powders and annealed at temperatures from 900° to 1200°C. The boundary of the si…
Ring-opening polymerization inside the channels of mesoporous silica is reported for the first time. A composite material consisting of mesoporous silica and the [1]silaferrocenophane shown in the Figure has been examined by solid-state NMR and powder X-ray diffractometry. It is demonstrated that the products of the p…
Mn[N(CN)2]2(pyz) (pyz = pyrazine) orders antiferromagnetically at low temperature and possesses intralayer µ-NCNCN and interlayer µ-pyz ligands that form a pseudo-ReO3 interpenetrating network structure.
Chiral complexes selectively soluble in perfluorocarbons have been synthesized for the first time and tested as catalysts for the epoxidation of alkenes under fluorous biphasic conditions.
Samples of the Sm2Fe17 alloy were exposed to hydrogen or nitrogen gas compressed to pressures between 1. 0 and 1. 5 GPa. Sample hydrogenated at 1000C and 1. 12 GPa (H2) pulverized completely but the crystalline structure did not differ from that obtained during hydrogenation at 1 MPa where pulverization does not occur…
Proceeding from the symmetry principles of crystal physics and thermodynamics we analyze parametrical optical phenomena induced by external fields of different kind and structural phase transitions in ferroelectrics and ferroelastics. Special attention is paid to the phenomena of spatial dispersion (electro-and piezog…
Most of the large-scale integrated circuits (LSIs), indispensable at present day, are made from Si wafers grown by Czochralski (CZ) method. The size of LSIs continues to grow with the integration of more devices. The diameter of Si crystal has also been increasing to enable the production of large-size LSIs with pract…
Abstract Small ether polycarboxylate and acetal polycarboxylate builders are reviewed with respect to their synthesis, calcium and magnesium sequestration, and biodegradation.
This paper attempts to clarify the mechanism of pitting fatigue, one of the contact rolling fatigue failures at tooth faces in a gear. Carburized and carbonitrided JIS-SCr420 steels with as-heat treated surface were tested by geared roller tester with a contact stress of 3.68 GPa and a slip ratio of - 40%. At the surf…
ABSTRACT On 13 June 1996 a Midwest Oil Company's pipeline carrying crude oil ruptured, releasing an estimated 360 m3 (95 300 gal) into a farmer's field in central Indiana. The accident site was approximately 0.4 km (0.25 mile) south of a small rural community. Actions were taken to immediately contain and remove the o…