Materials Literature
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Abstract The physicochemical properties of clays can be modified by acid treatment with inorganic acids. This treatment is usually referred to as ‘acid activation’, because it increases the specific surface area and the number of active sites of the solids. In the present study, the acid activation of saponite from Ce…
Zirconia coatings were produced by reactive dc magnetron sputter deposition, using a system with multiple sputter sources and a biased substrate stage. Tetragonal zirconia with either a random orientation or a highly (111) preferred orientation was formed by applying a substrate bias. Coating grown with no substrate b…
(La,Sr)MnO 3 (LSMO) thin films were fabricated on (100)SrTiO 3 single crystal substrates by the chemical solution deposition (CSD) process and their properties were evaluated at room temperature. All the films sintered at the temperatures ranging from 600 to 900°C were crystallized into perovskite single-phase LSMO wi…
Summary We have examined the way that the metallic ion Cr(III) is held by Na‐montmorillonite and alumina pillared clay. We used several physico‐chemical methods of analysis (X‐ray powder diffraction, infrared absorption spectrometry, thermal analysis and chemical composition) to determine the structural formula of the…
Abstract Ethyl cinnamate/montmorillonite intercalation complexes were obtained by gaseous adsorption of the drug on the clay surface. They were characterized by powder X-ray diffraction, differential thermal and thermogravimetric analyses and by visible-UV and IR spectroscopies. It was found that after 1 day of adsorp…
Abstract Described are the physical and chemical properties of the methyl esters of two uncommon fatty acids: vernolic acid, containing an epoxy group, and crepenynic acid, containing a triple bond. The incorporation of an epoxy or alkyne group into the fatty acid structure is shown to greatly affect the properties co…
Abstract Nanolayer and microlayer coextrusion is a method for combining two or three polymers as hundreds or thousands of alternating layers with individual layers as thin as tens of nanometers. The possibility for utilizing microlayer coextrusion as a tool for creating microplatelets of high aspect ration was explore…
Abstract The atomic economic reaction of acetic acid formation from methane and carbon dioxide via dielectric-barrier discharges at ambient conditions was investigated in this work. A significantly high selectivity of acetic acid (up to 5.3%) has been achieved with high conversions of methane (more than 54.1%) and car…
Abstract Reactions of 2,3,5,6‐tetra(2‐pyridyl) pyrazine (tppz) with [ML 6 ][X] 2 (L = CH 3 CN, H 2 O;X = [BF 4 ] − , [ClO 4 ] − , [NO 3 ] − [BArF] − (BArF ‐ B[3,5‐C 6 H 3 (CF 3 ) 2 ] 4 ) lead to the high‐yield formation of mononuclear [M(tppz) 2 ] 2+ , (M = Mn II , Fe II , Co II , and Ni II ) and dinuclear [Ni 2 (tppz…
The interaction of electrons with acoustic phonons is considered in a nanotube with chiral symmetry placed in a magnetic field parallel to the nanotube axis. It is shown that in such a system, the electronic energy spectrum is not invariant under electron wavevector reversal and, therefore, the electron-phonon interac…
In this study, a novel sol−gel method is used to synthesize amorphous silica−alumina materials with a narrow mesoporous distribution and various Si/Al molar ratios without using any templates and pore-regulating agents. During the preparation procedure, only inexpensive inorganic salts were used as raw materials, inst…
Abstract The interfacial adhesion between four different forms of jute fibers (sliver, bleached, mercerized and untreated) and polyolefinic matrices (LDPE and PP) was studied, as a critical factor affecting the mechanical behavior of these composites. The fiber‐matrix adhesion was estimated by means of the critical fi…
A new denitrifying chemoorganotrophic bacterium capable of aerobic and anaerobic degradation of poly(3-hydroxybutyrate) (PHB) and poly(3-hydroxybutyrate-co-hydroxyvalerate) (PHBV) was isolated from activated sludge. A phylogenetic analysis based on 16S rDNA sequences indicated that the new isolate is a member of the b…
Molecular dynamics simulations of two series of single copolymer chain models with precisely controlled methyl branching and with branches of different lengths are performed. For the models with precisely controlled methyl branching, the collapse process and the morphology of the lamellar structure are similar to thos…
Abstract Nacrite and dickite are found in two localities in northern Taiwan. One, containing nacrite and dickite, is associated with a gold-enargite deposit as a vug-filling clay in the Chinkushih (CKS) mine district near the northern coast. The other is the occurrence of dickite in the interstices of a Miocene coarse…
Multi-domain homeotropic liquid crystal alignment has been recognized as an alignment method to achieve wide viewing angle for thin-film-transistor liquid crystal displays (TFT-LCDs). In the past decade, several types of multi-domain homeotropic TFT-LCDs have been well studied. In all these LCDs, a homeotropic polyimi…
The kinetics of the reactions of the flavylium ion 1a and the 4′-methoxyflavylium ion 1b with various π-nucleophiles and tributylstannane were investigated photometrically in dichloromethane. Electrophilicity parameters E(1a) = −3.46 and E(1b) = −4.96 were derived from the equation log k (20 °C) = s(E + N); these allo…
Naturally colored camel brown and olive green cottons are cultivated and their physical properties studied. The ash content of these cottons is higher than for J-34 white cotton, due to the presence of more heavy metals. The limited oxygen index value of naturally colored cottons is also higher than for white cotton,…
Three derivatives of 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetrakis(methylene phosphonic acid) (DOTP) containing a hydrophobic substituent on one side chain were prepared and their lanthanide complexes examined by NMR. The new ligands include 1-(1-octyl-methyl-phosphonic acid)-4,7,10-tris(methylene phosphonic acid)-…
We successfully synthesized carbon nanotubes with very small diameters (5–10 nm) at room temperature by using high energy laser pulses (193 nm, 5 J/cm 2 and 20 ns duration time) to re-excite the carbon species contained in the laser ejected plume. The carbon nanotubes, which presumably formed in gas phase, were prefer…