Materials Literature
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Employing a time dependent Ginzburg-Landau type model for nematic liquid crystals in two dimensions, we study the kinetics of nematic ordering in a porous medium following a zero temperature quench from the isotropic phase. We consider various geometrical properties of computer generated model porous media, and comput…
Abstract In conventional sintering, high heating rates are often used to enhance densification and reduce grain growth. The essence of this concept is to use fast heating rates to favor densification instead of grain growth, if the activation energy for densification is greater than that for grain growth. At low tempe…
We have determined the initial cleavage rate of the cyclobutane ring of poly[4,4′-oxydiphenylene-1,2,3,4-cyclobutanetetracarboximide] (CBDA-ODA) for linearly polarized ultraviolet light (LPUVL). The initial cleavage rates β// and β/ for LPUVL polarized parallel and perpendicular to the polyimide backbone direction, re…
Abstract The traditional application of titanium dioxide was as a white pigment; later, it was discovered their photocatalytic properties as an anode for the photo-oxidation of water. Furthermore, titanium dioxide films are now widely used in catalysis and photocatalysis because of low cost and other advantageous prop…
This paper describes the effect of terminal substituent on the mesomorphic properties in 3-and 4-(4-alkoxyphenoxycarbonyl)phenyl 3- and 4-R-benzoate and 4-(4-alkoxybenzoyloxy)phenyl 2-, 3-, and 4-R-benzoates (R = CF3, OCF3, OCF2H). The meta-trifluoromethoxy and para-difluoromethoxy compounds tend to show a smectic C p…
Phase chirality in disk-like lyotropic cholesteric phases (ChD) was investigated, which were induced by center and axial chiral dopants to achiral lyotropic nematic host phases (ND). In a lyotropic nematic matrix of the ND phase in the ternary system hexadecyldimethylethylammoniumbromid (C16Me2EABr)/water/n-decanol, a…
The only two series of carboxylic acids, 3-nitro- or 3-cyano-4-alkoxybiphenyl-4′-carboxylic acid, are known to exhibit the optically isotropic phase (SD). Now we synthesised 4-(branched alkoxy)-anilinebenzylidene-4′-carboxylic acid series, all being racemic, and investigated their mesophase properties by means of DSC,…
The development of new methods for obtaining materials with predetermined operational properties that ensure the durability and the wear resistance of friction units is an urgent problem in modern material science. The article considers the effect of ultrasonic pressing modes with simultaneously superimposed low-frequ…
The problem of determining the drive waveform that produces a desired output from a hysteretic, saturating material is considered both theoretically and experimentally. The specific problem of interest is the production of a high-amplitude, but monofrequency, sinusoidal polarization response. (The techniques presented…
Poly(butylene terephthalate)/polyarylate (PBT/PAr) blends of various compositions were subjected to a series of thermal and mechanical treatments. The evolution of the structure together with the static mechanical properties of produced fibers were investigated. It was found that zone drawing-zone annealing at 140 and…
Das Verhalten verschiedener Halbzeugformen aus sechs austenitischen Sonderedelstählen und Nickelbasislegierungen im Lieferzustand wurde in einigen Standardkorrosionstests geprüft. Dabei wurde die Beständigkeit gegenüber interkristalliner Korrosion an den Halbzeugformen Blech, Band, nahtloses und Längsnaht-geschweißtes…
Protein Science, the flagship journal of The Protein Society, serves an international forum for publishing original reports on all scientific aspects of protein molecules. The Journal publishes papers by leading scientists from all over the world that report on advances in the understanding of proteins in the broadest…
We have investigated the deposition conditions for a SiO 2 insulation layer, such as the substrate-target length, Ar pressure and applied RF power density, using both RF magnetron facing target sputtering and the conventional RF sputtering techniques. We have fabricated an SiO 2 layer having with a good surface smooth…
The application of thermal barrier coatings (TBC) is increasing in aeroengines. Surface temperatures up to 1450°C require the application of ceramic TBCs because the temperature capability of metallic substrate materials is not high enough. The service life of turbine components could be improved by the use of yttria…
In India, many vegetable fibres, having good potentiality, are not being properly exploited. If these fibres are put to proper use, the rural economy of the country cou Id be improved significantly. One of these is the wildly grown fibre crop(Leptadenia pyrotechnic), belonging to the family 'Asclepiadaceae' and is pop…
A new class of biodegradable polyampholytes, poly[(aspartic acid)-co-lysine], were synthesized by thermal polycondensation of aspartic acid and lysine under reduced pressure and subsequent hydrolysis. Polymerization conditions were optimized to yield maximal water-soluble poly(succinimide-co-lysine) with high molecula…
Tin oxide films were grown by Chemical Vapor Deposition (CVD) on glass and Si substrates at atmospheric pressure (AP) and temperatures varying between 430 and 580 degreesC in a cold wall orizontal reactor, radiatevelly heated, by oxidation of SnCl4 vapors with O-2. The structure of SnO2 thin films has been studied by…
Physical properties, i.e. phase transition temperatures, response times, Ps values, tilt angles, helical twisting powers and helical twisting senses of a series of novel ferroelectric liquid crystalline compounds with non-substituted and halogen-substituted dispiro[2.0.2.1]heptyl moieties in their side chains have bee…
Polynaphtylmethacrylates (PNMA) are considered as a new class of liquid crystal (LC) photoaligning polymers. The films of PNMA irradiated with polarized UV light provide high quality LC alignment with the easy axis oriented perpendicularly to polarization direction of the exciting light. A maximal value of the azimuth…
The temperature behavior of the low-frequency Raman spectra of vitreous and supercooled liquid benzophenones is investigated experimentally. The structural phase transformations are studied by differential scanning calorimetry. The results obtained suggest that the structure of glasses involves nanometer-sized fragmen…