Materials Literature
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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…
Reduction of losses of Mn-Zn ferrites is of great importance to develop power supplies reduced in size and weight.For this requirement many attempts to study loss characteristics have been carried out, however, all contributions of each loss factor have not been made clear yet. In this study the eddy current losses ar…
Powder XRD defined α-AlF3 has been investigated by XPS and XAES using the Au 4f7/2 orbital for static charge referencing. This feature originates from well-defined and chemically inert 20 nm gold particles deposited in a highly dispersed pattern on the sample surface. The particles, with a sharp particle size distribu…
We have studied the electron emission characteristics of Mo field emitter arrays (FEAs) using a diamond-like carbon (DLC) film deposited by a layer-by-layer technique using plasma enhanced chemical vapor deposition. The turn-on voltage was lowered from 55 to 30 V by a 20 nm thick hydrogen-free DLC coating and maximum…
We have followed the evolution of the superconductingTc on intercalation of Li in ZrSe2 by means of magnetization studies at very low temperatures. To interpret the electronic structure and instabilities, we present the results of extensive LMTO-ASA band structure calculations on ZrSe2 and the idealized compound LiZrS…
The formation of spontaneous gratings in thin waveguide AgClAg photosensitive films was studied under elliptically polarized laser radiation. New peculiarities of the gratings growth were found (i) a deviation in angular position of the wave vectors of the most probable microgratings from π / 2 about the major axis o…
Abstract A method for enhanced nucleation of diamond growth on non‐diamond substrates is introduced via the results obtained in a wide variety of applications. The exact details of the method are still proprietary, but the outcome, as demonstrated in this paper, is unique and promises to be of great practical use. The…