Materials Literature
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The role of flexoelectric properties in arising of the electric field induced periodic deformations of nematic planar layers, known as longitudinal domains, was determined numerically. Rigidly anchored insulating nematic was considered. Both signs of dielectric anisotropy were taken into account. The structure of the…
Understanding physical phenomena often requires a comprehensive imagination of the subject. Visualization software uses two main approaches for presenting three-dimensional (3D) physical systems in two dimensions (2D): 3D virtual simulation (3D view) or 2D cross-sections (2D view). We focused on liquid crystals (LCs)…
Modern life is dependent on computer technology, and because the volume of digital data in the world is increasing rapidly, the importance of data storage devices is also increasing rapidly. Among them, demands for magnetic disk drive well-known as hard disk drives is quite huge and information recording density on th…
In this study we investigate the silylation of OH groups with different silazanes. In particular we use density functional theory and the nudged elastic band method to study the different reaction mechanisms. For the silylation reaction of hexamethyldisilazane and trimethylaminosilane with silanol, the minimum energy…
In this study, catalytic urea hydrolysis for production of ammonia in presence of fly ash, at optimum condition, was investigated in a batch reactor. The single and combined effects of operating parameters such as initial feed concentrations, temperature, fly ash doses, times and stirring speed on the production of am…
In this paper four optically active dopants with high Helical Twisting Power are investigated. Chiral compounds were tested in two kinds of achiral mixtures with broad temperature range of the nematic phase. The mixtures have been chosen considering different kind of polar group substitution in their components molecu…
Abstract Rotaxanes are considered to be prototype molecular machines bearing a rotor and an axis within a molecule. In our study on complex formation of modified α-CDs as host molecules for guest molecules consisting of an alkyl chain with pyridyl end caps, we observed control of complex formation and dissociation by…
Abstract Acyclic anthracene–acetylene trimers consisting of two 1,8-anthrylene units and one 1,5- or 1,8-anthrylene unit were cyclized by Eglinton coupling to form the corresponding cyclic trimer, hexamer, and higher oligomers. The molecular structures of these oligomers were investigated by X-ray analysis and DFT cal…
We study nematic LCs and nematic colloids flowing through microchannels using polarizing transmission microscopy and fluorescence confocal polarizing microscopy. Depending on the channel dimensions, the anchoring conditions on the channel walls, and the flow rate, the formation of different textures and defect structu…
Natural rubber latex (NRL) concentrates are important raw materials which are being used for the manufacture of products such as gloves, condoms, foams, balloons, catheters, baby soothers, dental dams, latex thread or elastic. Creaming is one of the methods for obtaining latex concentrate from field latex. This paper…
Three new antiferroelectric mixtures W-1000, W-1000A and W-1000B and their components W-1, W-2 and B-3 synthesized at Military University of Technology were investigated by dielectric spectroscopy. Typical relaxation modes in smectic phases and one mode in isotropic phase never observed before were detected. Obtained…
Abstract A novel, sensitive, and highly selective fluorescent probe which contains 2-(2-hydroxyphenyl)benzimidazole receptor groups has been prepared for detecting glutathione (GSH) that operates under aqueous conditions. The complex of the fluorescent compound with copper(II) ion was selectively responsive to GSH and…
This article investigates the viscoelastic behavior of poly(acrylonitrile) (PAN) and poly[ N -(4-carboxyphenyl)maleimide] (PMI) solutions in dimethylformamide (DMF) in comparison with PMI/PAN/DMF ternary mixtures. Some rheological characteristics, such as viscosity and relaxation time, were investigated as functions o…
For the purpose of developing novel photovoltaic materials and organic photovoltaic devices with good performance characteristics, 5-cyano-2,2′:5′,2″-terthiophene (3T-CN) and 5-cyano-2,2′:5′,2″:5″,2″′-tetrathiophene (4T-CN) were synthesized. The 3T-CN and 4T-CN were donor–acceptor oligothiophene derivatives possessing…
We created a free-standing membrane as a novel bioscaffold through the assembly of polymer-coated liposomes. Polyarginine (P(Arg)) possessing a cell-penetrating activity was used to form the polymer layer onto a negatively charged liposome (lipo-P(Arg)). The capsule wall of P(Arg) over liposomes made it possible to im…
Photolysis of 2,6-bis(4'-azidophenyl)-4-phenylpyridine in 2-methyltetrahydrofuran (2MTHF) glass at 7 K leads to quintet 2,6-bis(4'-nitrenophenyl)-4-phenylpyridine as a mixture of rotational isomers. The electron spin resonance (ESR) spectrum of this mixture of rotamers shows a considerable broadening of many transitio…
Nanoparticle dispersion plays a crucial role in the mechanical properties of polymer nanocomposites. Transmission Electron Microscope/Scanning Electron Microscope (TEM/SEM) images are commonly used to represent nanoparticle dispersion without further quantifications on its properties. Therefore, there is a strong need…
A method is proposed to study water networks pipe friction parameters (PFPs) identification problem of water networks by solving a PFPs identification equation. The PFPs identification equation corresponding to an actual engineering problem usually has non-unique solutions. To express identification results, a method…
The performance of different sizes of zinc, and aluminium galvanic anodes on the cathodic protection of mild steel in seawater and 0.2 M sulphuric acid was evaluated at ambient temperature. The magnitude of corrosion protection by the galvanic anodes was observed by weight loss method,corrosion rate calculation and po…
Preharvest ComCat® treated tomatoes and untreated controls were evaluated for changes in physiological and microbiological quality characteristics during storage at 13°C and room temperature (16.9 to 25.2°C) and a relative humidity of 34 to 76% after 8, 16, 24 and 30 days. The effectiveness of modified atmosphere pack…