Materials Literature
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Abstract Bis-dipyrrin-appended porphyrin derivatives, potential building blocks for supramolecular coordination architectures, were synthesized and exhibited complexation at the two dipyrrin sites with BF2 and Rh(CO)2.
OPLS-AA force field and direct integration of intermolecular radial distribution functions (RDF) were employed to calculate absolute binding constants of pyridine molecules to amino group (NH2) and amide group hydrogen atoms in and first generation poly(amidoamine) dendrimers in chloroform. The average errors in the a…
Abstract The serpentine subgroup mineral berthierine was synthesized as a metastable precursor of the chlorite group mineral chamosite in cold seal pressure vessels at 575°C, 0.5 GPa and f O 2 -conditions of the NNO buffer from a glass of almandine bulk composition. The run products were investigated with X-ray powder…
This work reports on the effect of CO2 at subcritical conditions and the gaseous state on the telechelic poly(epsilon-caprolactone) polymers. The tested polymers are semi-crystalline in nature and thus the effect of functional groups and their overall contribution to foaming and formation of microstructures with open-…
Abstract The interaction of the water-soluble 5,10,15,20-tetrakis(l -methyl-4-pyridyl)-21 H ,23 H -porphine (TMPyP) with different 2:1 phyllosilicates was examined by Raman and UV-visible spectroscopies. The clay samples were saturated with the tetracationic porphyrin and isolated from the aqueous suspension. A red sh…
Abstract The island of Lipari (Italy) is characterized by calc-alkaline to potassic volcanism and a Mediterranean-type climate. The mineralogical and chemical features of two different soil profiles with ages of 92,000 and 10,000–40,000 y, respectively, have been investigated. There were no Andisols, but Vitric and Ve…
Spreading of 5-15 microL water drops on self-assembled monolayers of 1-hexadecanethiol and 11-mercapto-1-undecanol, both homogeneous and mixed compositions, formed on gold-coated silicon wafers or glass slides was recorded with a high-speed video camera. The time (t) evolution of the drop base diameter (D) during spre…
Abstract Montmorillonite was equilibrated with high normality Cl − solutions to assess the possible presence of Me Cl + ion pairs in smectite interlayers suggested by chemical modeling of cation exchange experimental studies. Structural modifications induced by the presence of such ion pairs, and more especially those…
The effect of alkyl group substituents on the degradation rate of poly( n -alkyl acrylate) was investigated by studying the ultrasonic degradation of poly(methyl acrylate) (PMA), poly(ethyl acrylate) (PEA), and poly( n -butyl acrylate) (PBA) in o -dichlorobenzene at 30 °C. A continuous-distribution kinetic model with…
The (7,7) and (10,5) carbon nanotubes were studied in the context of the Density Functional Theory (DFT) within a generalized gradient approximation (GGA). The Becke's exchange functional along with the correlation functional of Lee, Yang, and Parr (BLYP) were used with the DZVP basis set aided via auxiliary functions…
Abstract A convenient liquid-phase route was proposed to synthesize well-dispersed CuI nanoparticles from Cu+–DMF solution precursor, which was prepared by dissolving bulk CuI in DMF. When water was gradually added, nanoscaled CuI was produced through the decomposition of the complex formed in this solution. A passiva…
Two chiral bent-core mesogens Pn-O-PIMB(n - 2)* (n = 9 and 10) and their oxygen analogues Pn-O-PIMB(n - 2)*-(n - 4)O (n = 8, 9, and 10) with omega-[(S)-amyloxy]alkoxy terminal groups were prepared, and their phase structures were investigated by means of electro-optic, polarization reversal current and second harmonic…
The adsorption of atomic oxygen and nitrogen on the beta-cristobalite (100) surface is investigated from first principles density functional calculations within the generalized gradient approximation. A periodic SiO2 slab model (6 layers relaxing 4 or 6) ended with a layer of Si or O atoms is employed throughout the s…
A simple method for the construction of a stable, tunable, self-assembled command layer for liquid crystal display purposes is described. A pyridine-functionalized oligosiloxane spontaneously forms an anisotropic, grooved surface on indium-tin-oxide, enabling it to align liquid crystalline molecules. The pyridine func…
Intermolecular proton transfer in solid phase from the hydroxo bridge to a water molecule occurs in a new mu-hydroxo iron(III) compound of formula {EtNH3[Fe2(ox)2Cl2(mu-OH)].2H2O}n leading to a still crystalline compound in which the mu-oxo bridge replaces the mu-hydroxo one. Both three-dimensional compounds exhibit m…
For the first time, polyamide-6 nanoparticles were successfully obtained by anionic polymerization of ε-caprolactam in heterophase using the miniemulsion process. It is shown that stability of the monomeric miniemulsion was obtained by dispersing either molten ε-caprolactam or ε-caprolactam dissolved in a polar solven…
Abstract Layer charge reduction of selected homoionic swelling clay minerals upon heating is reviewed. This phenomenon is known for Li + -montmorillonites as the Hofmann-Klemen effect. Aspects covered in the review include: mechanism of the charge reduction caused by the irreversible migration of small cations into th…
Silica monoliths exhibiting a unique hierarchical network structure with a bimodal pore size distribution and high surface areas were prepared from three different glycol-modified silanes by sol−gel processing. Tetrakis(2-hydroxyethyl)-, tetrakis(2-hydroxypropyl)-, and tetrakis(2,3-dihydroxypropyl)orthosilicate were o…
We report a comparative study of metal-surface-catalyzed ZnO nanowire growth. The growth is initiated on Si and sapphire substrates, which were prepared with thermal vapor deposited thin metallic films. As described earlier for Au films, these films may change morphology at growth temperatures and catalyze ZnO nanowir…
In this Communication is it shown the role of Ca-doping in stabilizing the A-type AFM structure of the optimally doped La1.4Sr1.6Mn2O7 bilayered manganite.