Materials Literature
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Polarization and morphological characteristics of thin ZnO films deposited on tin‐coated glass electrodes are presented. The films were obtained at a low temperature by an electrolytic process, where the cathode potential is an important control variable. The process is also promising as an electrochemical doping tech…
Regioregular poly(3-alkoxy-4-methylthiophene)s bearing crown ethers of different sizes (12-crown-4), PT12C4; and (15-crown-5) PT15C5) have been synthesized and their thermochromic and ionochromic behaviors investigated. These polythiophene derivatives exhibit a highly conjugated form in the solid state at room tempera…
Template directed reaction of dialdehydes and (R,R)- or (S,S)-1,2-diaminocyclohexane affords a practical route to chiral, metal-free macrocyclic salen dimers which have a novel calixarene-like structure and show catalytic activity for enantioselective epoxidation of unfunctionalized alkenes in the presence of MnIII–Na…
The infrared reflectivity of a ${\mathrm{La}}_{0.67}{\mathrm{Ca}}_{0.33}{\mathrm{MnO}}_{3}$ single crystal is studied over a broad range of temperatures (78--340 K), magnetic fields (0--16 T), and wave numbers $(20--9000{\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}).$ The optical conductivity gradually changes from a Drude…
On the origin of the non-exponential behaviour of the -relaxation in glass-forming polymers: incoherent neutron scattering and dielectric relaxation results , J Colmenero, A Arbe, A Alegría, M Monkenbusch, D Richter
Nanoscale materials created from boron nitride (BN) by arc discharge between ZrB 2 electrodes in an N 2 atmosphere have been investigated by electron microscopy. BN nanotubes were formed together with Zr-compound nanoparticles encapsulated in BN cages. Most of the tubes were multilayered and had diameters from 3 to 40…
Monodisperse oligo(para-phenyleneethynylene)s (oligoPPEs) were synthesized by a divergent-convergent synthesis starting from 1,4-dihexyl-2-(3-hydroxyprop-1-ynyl)-5-[2-(triisopropylsilyl)ethynyl]benzene and using the Pd/Cu-catalyzed alkyne-aryl coupling. The groups hydroxymethyl (HOM) and triisopropylsilyl (TIPS) funct…
Dimethyldodecylammonium chloride functionalized poly(propylene imine) generation 3 dendrimers have been synthesized and proven to have strong antibacterial properties.
The first synthesis and Z-scan measurements of an octupolar polymer with off-resonant third order nonlinear optical properties are discussed; two other new molecular thiophene-based octupoles with similar nonlinearities are also reported.
The current provisions for determination of the upward temperature shift of the lower-bound static fracture toughness curve due to irradiation of reactor pressure vessel steels are based on the assumption that they are the same as the Charpy 41-J shifts as a consequence of irradiation. The objective of this paper is t…
Urea-functionalized dendrimers are prepared which show very efficient phase transfer, in particular of the diagnostically relevant anions pertechnetate, perrhenate and ATP; the extractability rates are evaluated quantitatively by tracer methods; their pH dependancy allows controlled release of guest molecules from the…
The synthesis, characterisation (XRD, DTA, IR, UV-Vis) and magnetic properties of the layered compound Co 5 (OH) 8 (O 2 CC 4 H 8 CO 2 )·5H 2 O are reported. It is characterised by a triangular magnetic lattice with a metal–metal distance of 3.1 Å and an interlayer distance of 14.3 Å. The layers are bridged through the…
The synthesis and characterization of a series of p-phenyleneethynylene oligomers that contain the 2,2′-bipyridine-5,5′-diyl moiety is reported; metallation of the oligomers with ReI(CO)5Cl and Ru(bpy)2Cl2 yields the corresponding (L)Re(CO)3Cl and (L)Ru(bpy)22+ complexes.
The reaction between yttrium nitrate pentahydrate and the sodium salt of allyl acetatoacetate afforded nonanuclear cluster anions [Y9(µ4-O)2(µ3-OH)8{MeC(O)CHC(O)Z}16]–, the functional group Z being the initial allyl one OCH2CHCH2 or an ethoxide depending on the experimental conditions.
The non-crystallographic symmetry of d-dimensional (dD) quasiperiodic structures is incompatible with lattice periodicity in dD physical space. However, dD quasiperiodic structures can be described as irrational sections of nD (n > d) periodic hypercrystal structures. By appropriate oblique projection of particular hy…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTComment on "Direct Observation of a Metastable Solid Phase of Mg/Al/CO3-Layered Double Hydroxide by Means of High-Temperature in Situ Powder XRD and DTA/TG"1Vicente RivesView Author Information Departamento de Química Inorgánica Universidad de Salamanca, Salamanca, Spain Cite t…
A nanostructure has been fabricated by photoelectrochemical etching (photoetching). The photoetching created a "nanohoneycomb" pattern made up of quadrangle cells, which were a few hundred nanometers wide and several micrometers deep. These cells were regularly ordered depending upon the crystallographic orientation.…
Electrostatic interactions are often critical for determining the specificity of protein-protein complexes. To study the role of electrostatic interactions for assembly of helical bundles, we previously designed a thermostable, heterotrimeric coiled coil, ABC, in which charged residues were employed to drive preferent…
A novel technique of adsorption porometry has been developed which allows us to measure pore size distribution of a thin porous film directly on a solid substrate in a simple way. The most important principle of this technique is the use of in situ ellipsometry to determine the amount of adsorbed/condensed in the film…
Nanoparticles of poly(lactic acid) (PLA) and of blends of PLA and monomethoxypoly(ethylene oxyde) (MPEO-PLA) were prepared by the double emulsion method. Sucrose was added to overcome nanoparticle aggregation with freeze-drying. Whereas PLA nanoparticles rapidly are phagocytosed by the mononuclear phagocyte system cel…