Materials Literature
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The transient kinetics of ethylene oxidation by oxygen over a commercial Pt/Rh/CeO 2 /γ-Al 2 O 3 three-way catalyst were modeled. Experiments were carried out in a fixed-bed microreactor with two separate inlets, enabling alternate feeding of ethylene and oxygen with frequencies up to 1 / 4 Hz. The experimental condit…
Mixed-stack structures of monovalent [Ni(dmit)2]- and planar M+(4,13-diaza-18-crown-6) (M+ = K+ or Rb+) supramolecular cation were obtained in the isostructural M+(4,13-diaza-18-crown-6)[Ni(dmit)2] salts. The mixed-stack structure decreases the effective π−π overlap of [Ni(dmit)2]- molecules, which results in the one-…
Combined small and wide angle X‐ray scattering (SAXS and WAXS) analysis was applied to purified biogenic silica of cultured diatom frustules and of natural populations sampled on marine tidal flats. The overall WAXS patterns did not reveal crystalline phases (WAXS domain between 0.07 to 0.5 nm) in this biogenic silica…
The induced-fit mechanism in Enterobacter cloacae MurA has been investigated by kinetic studies and X-ray crystallography. The antibiotic fosfomycin, an irreversible inhibitor of MurA, induced a structural change in UDP-N-acetylglucosamine (UDPGlcNAc)-liganded enzyme with a time dependence similar to that observed for…
Thermogravimetric curves and IR and UV-VIS spectra were measured for 1-butyl-3methylimidazolium based ionic liquids. The solubility of ionic liquids in several organic solvents was determined.
It is pointed out that the variation of the plasmon frequency of metal with temperatures, though generally extending to a very limited amount, could however have significant effects on the recently observed dependence of surface-enhanced Raman scattering (SERS) on substrate temperatures.
A version of a transient method for measuring specific heat, thermal diffusivity and thermal conductivity is presented. The dynamic temperature field is generated by the passage of the electrical current through a planar electrical resistance made of thin metallic foil. The heat is produced in the form of a step-wise…
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” opt…
Heavily Cu + -doped amorphous PbCl 2 has been obtained by quench deposition of the mixture of PbCl 2 and CuCl. Upon crystallization, the large majority of Cu + ions aggregate to form CuCl precipitates embedded in the crystalline PbCl 2 matrix. The present experiment opens up the possibility of producing densely disper…
Tryptophan analogues with unique spectral and photophysical properties offer intrinsic fluorescent probes for studying peptide−protein and protein−protein interactions. Two benzannulated indole derivatives, benz[ f ]indole and 3-methylbenz[ f ]indole, were synthesized and their fluorescence was characterized. The abso…
The effects of a partial substitution of Mo, Ga, Si or Al, respectively, for Fe on the structure and magnetic properties of Nd 8.4 Fe 87.1 B 4.5 alloy prepared by mechanical alloying have been studied in detail. The addition of 1.1 at% Mo, Si or Ga results in the improvement of the intrinsic coercivity of the nanocomp…
N-Benzoyl-L-tyrosyl-p-aminobenzoic acid hydrolase (PPH, human meprin), a zinc-metalloendopeptidase of the astacin family, consists of two similar subunits. As well as in small-intestinal epithelial cells, the enzyme is found in lamina propria leucocytes, human cancer cells and colorectal cancer tissue, making it a pot…
Laser-ablated rhenium, ruthenium, and osmium atoms react with O 2 in excess neon and argon during condensation to form the MO 2 dioxide molecules as major products. The MO 3 trioxides with D 3 h symmetry, the (O 2 )MO 2 dioxide complexes with C 2 v symmetry, and the tetrahedral MO 4 (M = Ru, Os) molecules are formed o…
We study the liquid-glass transition of the Lennard-Jones binary mixture introduced by Kob and Andersen from a thermodynamic point of view. By means of the replica approach, translating the problem in the study of a molecular liquid, we study the phase transition due to the entropy crisis and we find that the Kauzmann…
Molecular structure, morphological characteristics and electrical conduction in syndiotactic polypropylene (sPP) are studied. sPP is found to be highly resistant to thermal oxidation. The crystallinity measured by the x-ray diffraction meter is very low and shows no significant change with annealing, compared with tha…
Irreversible adsorption/deposition processes are defined as processes in which, once adsorbed, the particles can neither desorb from nor diffuse along the surface. These processes are commonly encountered when macromolecules or colloidal particles deposit on solid surfaces. This article presents a general and unified…
Our recent study on the incorporation of Sn in the lattice of MgAl-layered double hydroxides (LDHs) indicated that about 30 atom % of Al 3+ could be isomorphously substituted by Sn 4+ to form a new MgAlSn ternary LDH. In the present study, similar NiAlSn- and CoAlSn-LDHs were synthesized by a coprecipitation method. T…
We studied the dynamics of spontaneously spreading drops of viscous liquids over several decades of time. We show that there exist at least two different time scale behaviors which are compatible with the recently proposed combined theory of spreading dynamics.
Novel bent-core (banana-shaped) liquid crystals without Schiff-base units have been synthesized and investigated by polarized light optical microscopy, differential scanning calorimetry, X-ray scattering, and electrooptical investigations. These molecules are 4-(4-alkylbenzoyloxy)benzoates and 4-(4-alkoxybenzoyloxy)be…
We have combined the original diffusion-limited aggregation model introduced by Witten and Sander with the surface thermodynamics of the growing solid aggregate. The theory is based on the consideration of the surface chemical potential as a thermodynamic function of the temperature and nearest-neighbor configuration.…