Materials Literature
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Large ferroelectric single crystals of 0.48 Pb(Fe 1/2 Nb 1/2 )O 3 –0.52 PbTiO 3 solid solution system were first successfully grown using a modified Bridgman technique and their properties were investigated. The obtained crystals were about 25 mm in diameter, 100 mm in length and black in color. The crystal exhibited…
The specific heat measurements by means of the adiabatic calorimetry provided new information concerning the polymorphism of 5*CB. A relatively large enthalpy relaxation was observed in the vicinity of glass transition Temperature dependence of the relaxation time showed that the main contribution to the relaxation is…
In apparel production, many compressive garments such as girdles and corsets are generally made from more than one layer of elastic fabric, the layers sewn together to improve the functionality of the garments. To increase the versatility of the design and production of pressure garments used for burn rehabilitation,…
We have synthesized new high Δ n 3-ring phenylacetylene(3PA) liquid crystals which have substituent groups with core center phenyl ring and investigated the effects of substitution on physical properties. Nematic range and viscosity were improved remarkably with keeping high Δ n by introducing trifluoromrthoxy group.…
Synthetic, polycrystalline samples of alunite [K0.88(H3O)0.12Al2.64(SO4)2(OH)4.92(H2O)1.08] and oxonium-substituted alunite [H3OAl2.87(SO4)2(OH)5.61(H2O)0.39] have been investigated using incoherent, inelastic neutron-scattering (IINS) methods in or-der to determine the nature of the non-OH “H2O”. IINS measurements we…
The corrosion performance of ceramic films of SiO 2 ‐Al 2 O 3 prepared by the sol‐gel processing of organometallic compounds and deposited by dip‐coating technique on 1008 steel foils has been evaluated. Two kinds of procedures were developed to produce the sol‐gel coatings. The influence of the coatings on the chemic…
Thallium(I) complexes of 2,3,7,8,12,13,17,18-octaethylporphyrin and 5,10,15,20-tetraphenylporphyrin are shown to have two thallium(I) ions per porphyrin ligand. Syntheses, spectroscopic characteristics (UV-vis, MS, NMR), chemistry, and an X-ray crystal structure of bis-thallium(I) porphyrins are presented.
In this paper we report photo-alignment using low molecular weight dichroic materials. We produced photo-alignment by exposing thin films of dichroic materials such as methyl red, 4,4′-dihydroxyazobenzene and 4,4′-biphenol to linearly polarized light. The irradiation generates a preferred orientation of liquid crystal…
[No abstract available]
Submicron-sized cylindrical structures were obtained at the surface of silicon single crystal exposed to a compression plasma flow. A periodic structure formed by channels oriented normally to the surface was observed inside the modified surface layer. The period of the structure corresponded to the spacing of the sur…
This work consists of two sequential parts, which review the advances in uncovering the capacity of VLEED, STM and PES in revealing the nature and kinetics of oxidation bonding and its consequences for the behavior of atoms and valence electrons at a surface; and in quantifying the O–Cu(001) bonding kinetics. The firs…
This paper attempts to identify the handle and sensibility of woven silk fabrics for neckties to determine any relationships between them and purchasing preferences. Male and female students evaluate the specimens with a semantic differential scale of handle and sensibility adjectives: twenty-one hand adjectives are g…
Abstract Temperature‐programmed surface reaction (TPSR), temperature‐programmed reaction (TPR) and temperature‐programmed desorption (TPD) were used to study the synthesis of C 2 ‐oxygenates from syngas over Rh–Mn‐based catalysts supported on amorphous silica and mesoporous MCM‐41 supports. Both TPD and TPSR reveal th…
Lipase-catalyzed intermolecular transesterification between two different polyesters has been carried out using in toluene. The transesterification of poly(ε-caprolactone) (PCL) and (1,4-butylene adipate) took place via catalysis of lipase from Candida antarctica to give an ester copolymer. 13C NMR analysis showed tha…
Smectogenic organic compounds are made of rod-like molecules, which often have dipolar groups with lateral components. We argue that since the groups are generally off-axis , the electrostatic contribution to the intermolecular interaction between the neighbours in a smectic layer favours a tilting of the molecules. W…
Samples of Li0.5Fe2.5–xRxO4 (R = Al, Gd, Sm and La; x=0 and 0.1) were prepared by the standard ceramic method. The effect of trivalent ion substitution on the structure and on the magnetic properties of Li-ferrite has been studied. It is found that the Gd ion substitution improves the different magnetic properties of…
The effect of the oxidation state of iron on the phase separation of x Na 2 O·(100 – x )SiO 2 glasses, x = 18.56 and 13, containing 0.5 mol% Fe 2 O 3 was studied. The oxidation state of iron in the glasses was varied by changing the melting conditions, such as melting temperature and melting atmosphere. The oxidation…
[reaction: see text]. A novel convergent approach to fully functionalized ring C allocolchicinoids is developed which is based on the benzannulation reaction of Fischer carbene complexes with alkynes. The efficacy of this strategy was established with the conversion of bromide 1a (R1 = Me, R2 = H) to the biaryl phenol…
This study develops mathematical equations for an important quality of blankets, good handle, based on the compression and surface properties, thickness, weight, and thermal parameters. The handle of blankets is subjectively evaluated by thirty-nine judges. Two methods are investigated for evaluating the quality of bl…
Weld cladding of corrosion resistant materials is an attractive alternative to bulk usage. Such processes are generally associated with potential deterioration of mechanical properties at the clad/metal interface, often attributed to the formation of hard and soft zones which is usually minimised by control of dilutio…