Materials Literature
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This work deals with the investigation of the thermal and flammability characteristics of tanned leather based products. The materials testing under extreme conditions has been defined. It has been shown that semi-finished tanned products are slow burning materials. Moreover the burning process was dependent on the ta…
Acidification of K10A-alpha-[SiW9O34] in aqueous solution leads to the formation of alpha-[Si2W18O66]16-, built up from two A-alpha-[SiW9O34] subunits, which reacts with metal cations to form potassium and mixed potassium-transition metal complexes.
The symmetry constraints imposing on the quantum states of a dot with 13 electrons has been investigated. Based on this study, the favorable structures (FSs) of each state has been identified. Numerical calculations have been performed to inspect the role played by the FSs. It was found that, if a first-state has a re…
The number and the geometric distribution of solvent molecules around a metal ion in solution are an important factor in the structural and chemical behavior of cation.1-8 Indeed, such information has been utilized to design novel ionophores and receptors.9-14 However, there have been few studies of hydration structur…
Viscoelastic simulations of bubble growth in Polypropylene physical extrusion foaming were performed. A multi mode PTT model was used for analyzing the dynamic growth behavior of spherically symmetric bubbles with consideration of diffusion of foaming agent. Changes in dissolved foaming agent concentration in polymer…
The utility of electronegativity and the extended electronegativity function in describing the charge distribution in simple coordination compounds of both the representative and transition metals has been explored. The extended electronegativity function has been shown to yield excellent atomic charges and charging e…
We have investigated the surfaces of rubbed polystyrene (PS) films in detail using atomic force microscopy and have discovered a previously unknown surface feature: submicroscale meandering groove-like structures composed of gravel-like grooves in tens of nanometers are present, oriented perpendicular to the rubbing d…
Biodegradable polyure-thanes may be able to replace nondegradable polymers suchas polyethylene and polypropylene in fabrication ofpackaging films in near future as long as their mechanicalproperties are comparable to those of the common film-forming materials. Polyurethanes containing poly(ethylene glycol) (PEG) arein…
Glasses belonging to the x Fe 2 O 3 ·(100-x)[3 B 2 O 3 · BaO ] system, with 0≤x≤50 mol% were prepared and characterized by IR spectroscopy in order to obtain information about the influence of Fe 2 O 3 on the local structure in the 3 B 2 O 3 · BaO glass matrix. The mode in which both Fe 2 O 3 and BaO influences the st…
We investigated the variation of the emission properties of tetramethylammonium ion-containing faujasite zeolite treated with bis-(perfluoromethylsulfonyl)amide (PMS) as a function of the Nd(III)-loading level. The emission intensity increased with the Nd(III)-loading level. The emission decays did not follow simple f…
A theory for paramagnetic relaxation enhancement (PRE) in systems with S> 1 at low magnetic field is developed for the case when the fluctuations of zero-field splitting (ZFS) in the molecular frame are larger than the averaged ZFS. The validity limits of the new theory are discussed, and its performance is evaluated…
[reaction: see text] Acid-catalyzed reactions of 5-(2',3',4',5',6'-pentafluorophenyl)dipyrromethane with aryl aldehydes and of 5-(aryl)dipyrromethanes with 2,3,4,5,6-pentafluorobenzaldehyde allowed the preparation of a variety of meso-aryl [26]hexaphyrins.
The largest pi-conjugated dendrimers containing up to nine 10,15-dihydro-5H-diindeno[1,2-alpha;1',2';-c]fluorene (truxene) moieties have been prepared with good yields by repetitive Friedel-Crafts acetylation and acid-promoted cyclotrimerization reactions. An alternative approach to the convergent synthesis of desired…
We report the realization of a new multi-band-gap semiconductor. The highly mismatched alloy Zn1-yMnyOxTe1-x has been synthesized using the combination of oxygen ion implantation and pulsed laser melting. Incorporation of small quantities of isovalent oxygen leads to the formation of a narrow, oxygen-derived band of e…
We have used field-effect transistor (FET) devices with semiconducting single-walled carbon nanotubes (SWNTs) as the conducting channels to study interactions of aromatic compounds with SWNTs. Electronic detection occurs through charge-transfer effects, monitored as the change of the gate voltage ( V g ) dependence of…
A three-step seed-mediated growth method was used to make gold nanoparticles. Different surfactants, alkyltrimethylammonium bromides (C n TAB, n = 10, 12, 14, 16, and 18) and cetylpyridinium chloride (C 16 PC), were chosen as stabilizers. In general, it was found that as the length of the surfactant chain increased, t…
New electrooptical effect which is realized in nematic liquid crystal with high-density of defects is proposed. The electrooptical characteristics of electrooptical effect in high-defect nematic material is studied. The light modulator based on considered effect is elaborated and studied.
Abstract Crosslinked styrene‐butadiene and butadiene rubbers can efficiently be analyzed by liquid chromatography and FT‐IR spectroscopy. In a first step the vulcanizate is pyrolyzed under mild conditions. The resulting high molar mass fragments are extracted from the bulk material and analyzed by size exclusion chrom…
The reactivity of the cation radicals formed by oxidation of four 3,4-alkylenedioxypyrrole and 3,4-alkylenedioxythiophene monomers has been investigated by fast scan cyclic voltammetry, from the V/s to the kV/s range. The results show that all cation radicals react quickly as desired for electropolymerization and elec…
Triplet phases recorded from insulin crystals were used to measure the improvement of phases during model refinement and to quantify the contribution made by each step in the refinement. Conventional amplitude data were recorded to 1.5 A resolution from rhombohedral pig insulin crystals using 1.54 A Cu Kalpha radiatio…