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排序方式: 共有61条查询结果,搜索用时 15 毫秒
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The orienting action of three types of layers on liquid crystal is investigated. Homogeneous orientation of the liquid crystal layer is obtained under the action of a transparent conductive SnO2 film and carbon film. Such an orientation is achieved with gelatin films as well. Homeotropic orientation of the liquid crystal can be also obtained by exposing the latter to ion bombardment with Ar ions. 相似文献
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Ivan N. Bardasov Anastasiya U. Alekseeva Denis L. Mihailov Oleg V. Ershov Oleg E. Nasakin Viktor A. Tafeenko 《Tetrahedron letters》2014
The synthesis of 2-(dicyanomethylene)-1,2-dihydropyridine derivatives from the reactions of arylmethylidene derivatives of malononitrile dimers with 1,3-dicarbonyl compounds is described. 相似文献
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RITVA LINDBERG GORAN SUNDHOLM JOHAN SJö BLOM PETRI AHONEN ESKO I. KAUPPINEN 《Journal of Dispersion Science and Technology》2013,34(1-2):715-722
The zeta-potentials of silica, copper, platinum and gold particles have been measured as a function of pH. The isoelectric points were found to be at pH 3.0, 5.8, 3.0 and 3.5, respectively. In the pH range 3.0 to 5.8 copper and silica particles are oppositely charged and accordingly the coating of silica with copper particles could be demonstrated. In the case of gold and platinum the sign of the charge is such that direct adhesion to silica particles cannot be expected and this was also demonstrated in the case of platinum. 相似文献
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Mihailov SJ Smelser CW Lu P Walker RB Grobnic D Ding H Henderson G Unruh J 《Optics letters》2003,28(12):995-997
High-quality retroreflecting fiber Bragg gratings were written in standard Ge-doped telecom fiber (Corning SMF-28) after a few minutes exposure with pulsed 800-nm, 120-fs laser radiation by use of a deep-etch silica zero-order nulled phase mask optimized for 800 nm. Induced index modulations of 1.9 x 10(-3) were achieved with peak power intensities of 1.2 x 10(13) W/cm2 without any fiber sensitization. The fiber gratings are stable and did not erase after 2 weeks at 300 degrees C. The primary mechanism of induced index change results from a structural modification to the fiber core. 相似文献
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van Enk SJ 《Physical review letters》2000,84(4):789; author reply 790
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Systems of water and polyoxyethylene with different molecular weights were studied calorimetrically. The enthalpies of melting of the eutectic phases, and the concentrations of bound water and polyoxyethylene were determined, depending on the composition and the POE sample.
Zusammenfassung Systeme von Wasser und Polyoxyethylenen unterschiedlichen Molekulargewichts wurden untersucht. Die Schmelzenthalpien der eutektischen Phasen und die Konzentrationen von gebundenem Wasser und Polyoxyethylen wurden bestimmt.
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The kinetics of nonisothermal crystallization and melting of blends of ultra-high molecular weight polyethylene (UHMWPE) and polyethylene high density with normal molecular weight (NMWPE) are investigated by means of differential scanning calorimetry (DSC). Mixing the components at a temperature below the flow temperature of UHMWPE (215 °C) results in increased crystallization/melting rates of the individual components in the blends above the corresponding additive values. The morphological observations of the blends, carried out by means of polarization microscopy, show that a strong boundary of both types of structures (UHMWPE non-flowing aggregates and NMWPE spherulite structures) does not exist. The NMWPE spherulites' dimensions decrease on increasing the UHMWPE concentration in the blends, but their number increases. The facilitation of the crystallization/melting of the components in the blends is explained in terms of mutual influence exhibited by the components with respect to each other. It is due to the inner stresses in nonflowing UHMWPE characterized with a lot of entangled tie molecules and to the partial co-crystallization of NMWPE molecules with the flowing part of UHMWPE. At mixing temperatures above 215 °C the melting/crystallization integral kinetic curves have only one linear part in contrast to these of the same blend (11 ratio of components), prepared at 190 °C. The rates of melting/crystallization remain almost constant with the increase of the mixing temperatures. 相似文献