Materials Literature
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Abstract Organofunctionalized silsesquioxane polymers obtained in a water-soluble form can be used to coat various substrates such as SiO 2 , SiO 2 /Al 2 O 3 , Al 2 O 3 , cellulose/Al 2 O 3 , and graphite or, when obtained in a water-insoluble form, can be used directly. These organofunctionalized silsesquioxanes can…
Photochromism of a symmetric diarylmaleimide derivative, having two thiophene rings (1), and a non-symmetric derivative having a S,S-dioxide thiophene ring and a thiophene ring (2) as the aryl moieties, was studied in various solvents. The photocyclization quantum yield of gradually decreased with increasing the solve…
In this study, the fabrication and characterisation of highly porous yet conductive scaffolds was performed. The conductive component, namely single-walled carbon nanotubes (SWNTs), was incorporated into a chitosan bio-polymeric matrix utilising a dispersion-based freeze dry approach. The electroactive polymer poly(2-…
Polypyrrole nanospheres synthesized by using the ultrasonic method were sulfonated with concentrated H2SO4 at different tempeartues. The catalytic performance of the sulfonated polypyrrole nanospheres in the esterification of methanol with acetic acid was evaluated and compared with that of sulfonated carbonized polyp…
Novel chiral amides (Ia–Ie, II) and azo compounds (III, IV) with a 1,3,4‐thiadiazole unit in the rigid core were synthesized and their liquid crystalline properties investigated by polarizing optical microscopy and differential scanning calorimetry. The amides Ia–Ie contain a chiral alkoxy chain derived from (R)‐2‐oct…
An asymmetric electrochemical capacitor based on polyfluorene/carbon nanocomposite as positive electrode and activated carbon as negative electrode with nonaqueous electrolyte of tetraethylammonium tetrafluoroborate/propylene carbonate was investigated. From a galvanostatic charge–discharge test, the asymmetric capaci…
The effects of hydrogen and prestrain on the tensile properties of a low carbon steel plate JIS-SGP (0.078 C-0.012 Si-0.35 Mn) were investigated. The steel gas pipeline material JIS-SGP, which is one of candidates for hydrogen gas pipelines, is produced from the low carbon steel plate by plastic working and welding. I…
Abstract — Oil-modified alkyd resin was prepared from crude castor oil. The experiment started with investigating the optimum conditions for neutralization of crude castor oil and bleaching of neutralized oil. Then the characteristics (iodine value, viscosity, acid value, refractive index and color) of oils were deter…
Mono and bifunctional zinc oxide catalysts were prepared to study their activity in the catalytic conversion of isobutanol. The prepared catalysts were characterized by X-ray diffraction analysis and nitrogen adsorption measurements. The conversion of isobutanol was taken as a model reaction to measure the catalytic a…
We have developed an efficient method for one-step covalent labeling of cell surface proteins with quantum dots based on enzyme catalyzed site-specific modification of short peptide tags.
A new polyoxovanadate [Zn2(dien)3][[Zn(dien)]2As4V16O42(H2O)] x 3H2O (1, dien = diethylenetriamine) has been hydrothermally synthesized and structurally characterized by EA, IR, TGA, magnetic measurement and single crystal X-ray diffraction. X-Ray diffraction analyses reveal that 1 exhibits the first [As4V16O42(H2O)]-…
Structurally similar bent-core compounds were studied by the X-ray diffraction method. Modulated bilayer structures were observed in lamellar and columnar B1Rev-type phases. Their formation is explained by a general tilt SmCG structure. In the case of the B1Rev-type phases the bilayer modulations were found to be inco…
The electronic structure of group 6-8 transition metal (TM) nitrido derivatives [PW(11)O(39){TM(VI)N}](4-) is studied computationally and the potential reactivity of the polyoxoanions is discussed. The observed electrophilic reactivity for the Ru(VI) nitrido derivative is rationalized from frontier molecular orbital a…
The synthesis and characterisation of a coumarin-dithienylcyclopentene-coumarin symmetric triad (CSC) and a perylene bisimide-dithienylcyclopentene-coumarin asymmetric triad (PSC) are reported. In both triads the switching function of the photochromic dithienylcyclopentene unit is retained. For CSC an overall 50% quen…
Polyelectrolyte complex (PEC) membranes were obtained by mixing solutions of two polymers of opposite charges, chitosan (Chi) and poly(acrylic acid) PAA. Three membranes were obtained: one made of pure chitosan and two membranes with chitosan mixed with PAA at a ratio of 95:5 (one prepared using PAA solution in 3.5% f…
A systematic study on the effect of a catalyst on the aerobic oxidation of cyclohexane was carried out using cobalt isooctanoate, metalloporphyrin p- ClTPPCo and [p- ClTPPFe ] 2 O as catalysts. The results showed that the metalloporphyrin-catalyzed system performed better than the traditional cobalt salt ( Co isooctan…
Hollow rhodium nanotubes with uniform and perfect structures have been successfully synthesized through the replacement reaction between Ag nanowires and RhCl3 in saturated NaI solutions at room temperature, and the main effect of iodide ions is found to reduce the redox potential of Ag species and resolve the formed…
The date pits flour was used as a filling material in composition with high density polyethylene (HDPE). The blending proportions were: (1) 10% date pits, 90% HDPE; (2) 20% date pits, 80% HDPE; (3) 30% date pits, 70% HDPE; and (4) 40% date pits, 60% HDPE. Thermal conductivities, specific heat, and melt flow index of t…
The final properties of composite materials are highly dependent on the residual geometrical parameters (length, diameter, aspect ratio), orientation and distribution of the fibres in the matrix, which in turn are related to the processing conditions. This study analysed the fibre structure variation during the proces…
We report surface patterning on the nanolevel with the “grafting to” approach carried out at relatively low temperatures (40 °C). Low grafting temperatures were achieved viasolvent-assisted grafting and allowed the use of the developed approach for surface templating in a variety of ways. Specifically, two examples of…