Synthesis of a chiral dendrimer based on polyfunctional amino acids
A chiral, nonracemic dendrimer of generation two based on aromatic bis- and tris-amino acids has been synthesised.
Materials Literature
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The energy-dispersive reflectometer/diffractometer at BESSY-I
We describe the set-up of an energy-dispersive reflectometer installed at the 6 T wavelength shifter (WLS) of the storage ring BESSY-I. It can be used for reflectometry and in-plane diffraction studies of thin films under ambient conditions. Due to the exponential decay of the incident spectrum, the whole useful energ…
Synthesis, X-Ray Structures, and Magnetic Properties of [Cu2(piv)4(Et3N)2] and [Cu6(piv)6(EtO)6] (Hpiv = Pivalic Acid): Role of Base for Dinuclear Adduct and Oligonuclear Formation
Abstract Copper(II) pivalate adduct with triethylamine, [Cu2(piv)4(Et3N)2] (Hpiv = pivalic acid), and cyclic hexanuclear copper(II) complex, [Cu6(piv)6(EtO)6], have been synthesized and characterized by X-ray crystallography and magnetic susceptibility measurement.
Low Temperature Superplasticity in a ZK60 Magnesium Alloy
Low temperature superplastic behavior of a magnesium alloy, ZK60, was investigated at about half the absolute melting point. The grains were equiaxed with an average size of 6.5 μm. The tensile tests revealed that the material exhibited low temperature superplasticity (LTSP) with elongation-to-failure of over 400%. Mi…
An acentric arrangement of p-nitroaniline molecules between the layers of kaolinite†
p-Nitroaniline molecules were intercalated between the layers of kaolinite, and an acentric arrangement of p-nitroaniline induced by the asymmteric environment of the interlayer region was accomplished.
Estimation of contact angles on fibers
A droplet of liquid placed on a flat high-energy solid surface spreads to give a thin film so that no macroscopic droplet shape exists. On a chemically identical solid surface with only the geometry changed to a cylinder, the same droplet can have an equilibrium conformation. When the equilibrium conformation is of a…
Fabrication of Gas Sensors Based on Soluble Phthalocyanines
Gas sensors based on 2,9,16,23-tetra(2,6-dimethylphenoxy)metallophthalocyanine (TDMP- MPc ) films on interlocking silver electrodes were fabricated by solvent casting from chloroform solutions containing 2,9,16,23-tetra(2,6-dimethylphenoxy)copper, cobalt or nickel phthalocyanine ( TDMP - CuPc , TDMP - CoPc or TDMP - N…
Polyelectrolytes bearing azobenzenes for the functionalization of multilayers
Abstract Thin polymeric films are assembled by the alternating adsorption of oppositely charged polyelectrolytes. The polyions are functionalized by azobenzenes, typically carrying donor‐acceptor substituents. The azobenzene chromophores are exploited as versatile analytical tools, to study the assembling process, and…
Dry etching of copper film with hexafluoroacetylacetone via oxidation process
Dry etching of Cu film was achieved via oxidation process using oxidizing agents such as O2 plasma, O3, or O3 plasma, followed by the removal process of the copper oxides (CuOx) by reaction with hexafluoroacetylacetone [H(hfac)] to form volatile copper compound, [bis-hexafluoroacetylacetonate: Cu(hfac)2] and H2O. The…
Hysteresis of the metal-insulator transition of ; evidence of the influence of microscopic texturation
Vanadium dioxide films have been deposited on silicon substrates by reactive RF cathodic sputtering from and targets. The optical measurements show a good contrast at the semiconductor-metal transition, but exhibit two kinds of hysteresis cycle: a narrow and symmetrical one, and a wider and asymmetrical one. We have m…
Preparation, thermal stability and decomposition routes of clay/Triton-X100 composites
The adsorption isotherms for the octylphenol ethoxylate, TX100, onto a range of bentonites and a saponite have been determined and the resulting thermal stability of composites has been studied. In general TX100 exhibited a high affinity for the different clay surfaces although the maximum amount adsorbed varied with…
Competition between the CyanobacteriumLimnothrix redekeiand Some Spring Species of Diatoms under P‐Limitation
Abstract The nutrient saturated growth and the competition between Limnothrix redekei and some spring diatoms for phosphate were studied in semi‐continuous cultures at 10°C with a 6/18 h light/dark cycle and at 15 °C with a 12/12 light/dark cycle. Under these conditions in unialgal cultures, the maximum specific growt…
Temperature Dependence of Vickers Hardness for TeO2-Based and Soda-Lime Silicate Glasses.
The temperature dependence of Vickers hardness (H) of TeO2-Based glasses such as 15Na2O⋅15ZnO⋅70TeO2 as host glasses for rare-earth doped optical amplifier was measured from room temperature to the glass transition region. The following features were found; (1) crack formation under the indenter easily occurs, the Vic…
Materials of Engineering
ents on the Properties of Steel . . . . . . . . . . . . . . . . 6-19 ment of Iron and Steel . . . . . . . . . . . . . . . . . . . . . . . 6-19 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-21 FRANK E. GOODWIN Vice President, Materials Science, ILZRO, Inc. DON GRAHAM Manager, Tur…
Structural and photophysical behaviour of lanthanide complexes with a tetraazacyclododecane featuring carbamoyl pendant arms †
The crystal and molecular structure of 1,4,7,10-tetrakis(N-benzylcarbamoylmethyl)-1,4,7,10-tetraazacyclododecane, L1, revealed an S2-symmetric molecule. One pair of pendant arms is involved in intramolecular hydrogen bonding while the other interacts with two other ligand molecules through strong intermolecular hydrog…
Graph Theory and the Passivity of Iron-Chromium Binary Alloys
Using graph theory, it is shown that the introduction of 70 atom % of into a ‐Cr‐O‐Cr‐ oxide network serves to disjoin the network, or conversely, introduction of 30% atomic concentration of serves to provide a connected ‐Cr‐O‐Cr‐ network. The results of surface analysis show that this concentration of 30 atom % in th…
Chapter 2. Neutron reflection study of globular protein adsorption at planar interfaces
J. R. Lu, Annu. Rep. Prog. Chem., Sect. C: Phys. Chem., 1999, 95, 3 DOI: 10.1039/PC095003
Surface-enhanced Raman detection of chemical vapors with the use of personal dosimeters
This article provides an overview of the development and application of surface-enhanced Raman scattering (SERS) for the detection of vapors of organic chemicals with the use of personal dosimetry. The approach used with this personal dosimeter requires no sample desorption or wet-chemical extraction procedure. The do…
Decapitation of dihydroporphyrazinediol derivatives: synthesis and X-ray structure of a novel seco-porphyrazine
The dihydroporphyrazinediol 8, which was prepared by Linstead macrocyclisation of 2,5-diiminopyrrolidine with 3,4-bis(4-tert-butylphenyl)pyrroline-2,5-diimine, followed by TFA demetallation and OsO4 tetroxide mediated dihydroxylation, underwent reaction with Ni(OAc)2 at 100 °C in the presence of air to give the novel…
A study of the reactions of Fe and FeO with NO2, and the structure and bond energy of FeO2
The reaction Fe+NO2→FeO+NO was studied by the pulsed two-photon dissociation at 248 nm of ferrocene vapour to produce Fe atoms in an excess of NO2 and He bath gas. Atomic Fe was then monitored by time-resolved laser-induced fluorescence spectroscopy at 248.3 nm [Fe(x5F05–a5D4)], yielding k(192<T/K<471)=(4.84-1.10+1.24…