Materials Literature
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The evolution of globular and dendritic structures in solidification of an Al–7mass%Si alloy has been investigated by a modified cellular automaton model (MCA). Besides retaining the probabilistic aspects of the classical CA model for the heterogeneous nucleation and the preferential growth orientations of the nuclei,…
Saline and sodic soils pose major agronomic problems in arid and semiarid regions. Marsh soils in the Guadalquivir Valley are representative of saline and sodic soils in estuarine environments, and are frequently reclaimed for agricultural use. Flooding affects the nature of P sorbent surfaces in soils; it increases t…
Oligothiophenes coupled to cyclophanes are shown to exhibit interesting optical properties. The molecule shown in the Figure is synthesized by dimerizing a substituted bithiophene using iron trichloride. The materials are thought to have potential in nonlinear optical and light-emitting diode applications.
Abstract The study of the effectiveness of several potential copper corrosion inhibitors in acidic media was studied. The investigated thiazole derivative functional groups contain heterocyclic atoms such as nitrogen, sulfur, and oxygen. Thiazole derivatives, 5-benzylidene-2,4-dioxotetrahydro-1,3-thiazole (BDT) 5-(4¢-…
A simple route to tetraaryltetrabenzoporphyrins (Ar4TBPs) is developed; the procedure allows for the introduction of substituents on both benzo- and phenyl-rings and employs readily available, inexpensive components.
Nanocrystalline ferrite formation by ball milling in pure Fe (0.004 mass% C) has been studied through morphology observation and microhardness measurements. It was found that nano-ferrite first formed at the outer surface area in the powders at the early stage of ball milling, which was attributed to the deformation l…
Two new extended chromophoric systems, in which a 4-aminoazobenzene moiety is linked to a cyclo-bridged hexatriene electron withdrawing group, have been synthesized, and show large optical nonlinearities and unexpected blue-shifted absorption in comparison with shorter chain analogues.
Self-Induced Voltage Oscillations during Anodic Etching of n-InP and Possible Applications for Three-Dimensional Microstructures , Langa, S., Carstensen, J., Tiginyanu, I. M., Christophersen, M., Föll, H.
The preparation of well-size-controlled colloidal gold nanoparticles in organic solvent is presented. After the preparation of well-size-controlled aqueous colloidal gold particles, we changed the solvent to an organic one. This technique is required to enable a chemical reaction between gold particles and hydrophobic…
Photochemical irradiation of porphyrins or phthalocyanines with violet or ultraviolet light absorbed by their second or higher absorption bands populates their higher excited states. These higher excited states generally dissipate very rapidly, but, competing with such rapid deactivation, often show unique behaviour d…
A new porphyrin trimer has been self-assembled by employing the mutually non-interfering coordination properties of the ruthenium(II) and tin(IV) centers to form a multi-metal array. The photo- and electro-chemical properties of this array are also reported.
New liquid crystals based on calixarenes (7 and 8) were prepared by the reaction of calixarene, tert-butylcalix[8]arene and C-methyloctakis(2-hydroxyethyl)calix[4]resorcinarene, and 11-[(4′-cyano-1,1′-biphenyl-4-yl)oxy]undecanoyl chloride in the presence of triethylamine. The structures of 7 and 8 were characterized b…
Photoisomerization of azobenzenes is an active area of researchsince it may play an important role in light-driven molecular systems. Here is described the first example of a chiral azobenzene system where the Z-isomer (see Figure) has greater helical twisting power than the corresponding E-isomer. This is the opposit…
The novel series of monometallic monocations Fc-[n]-Az+ and Fc-[n]-Guaz+ (where Az+ and Guaz+ denote azulenylium and guaiazulenylium cations respectively and n = 0–3), and a bimetallic dicationic complex Fc-[0]-Guaz(RuCp)2+ have been prepared. Single crystal structures of Fc-[0]-Guaz+ and Fc-[0]-Guaz(RuCp)2+ have been…
Copper(II) complexes with three diazamesocyclic ligands based on l,5-diazacyclooctane (DACO) bearing additional imidazole or phenol functional donor groups, 1,5-bis(imidazol-4-ylmethyl)- (L111), 1-(imidazol-4-ylmethyl)- (L222), and 1-(2-hydroxybenzyl)-1,5-diazacyclooctane (HL333), have been newly synthesized and chara…
The structure of a one-dimensional crystal of Sb2O3 encapsulated within a single-walled carbon nanotube and conformation of the latter have been solved simultaneously by high resolution transmission electron microscopy.
The reaction of an aqueous solution of sodium molybdate with cysteine hydrochloride acting as educt and reducing agent at rather low pH values (≈1.5) results in the formation of Na3[Mo154O462H14(H2 O)48(HO2C–(NH3+)HC –CH2–S–S–CH2–CH(NH 3+)–COO−)11] ·x H2O 1 (x ≈250) containing nanosized ring-shaped clusters which capt…
The preparation, crystal structures and variable-temperature magnetic susceptibility data for [Cu2(dpp)(H2O)(dmso)Cl4]·dmso (1a) and [Cu2(dpp)Cl4]n (2) (dpp = 2,3-bis(2-pyridyl)pyrazine, dmso = dimethyl sulfoxide) are reported. 1a consists of dinuclear dpp-bridged molecules with chlorine, water and dmso serving as ter…
The oxygen permeation through a wafer of Y2SiO5 has been measured in the temperature range from 1973 to 2033 K and the oxygen permeability constant of Y2SiO5 has been determined, because Y2SiO5 is favorable for the outer layer of our proposed oxidation protection double layered coating on C/C composites. We presented…
The decrease of the magnetic response under irradiation at very low temperature was interpreted as a new evidence of synergy between magnetic interaction and spin transition in an iron(II) binuclear SC compound.