Materials Literature
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Abstract The principle of multilayer interphases was proposed earlier for modifying the mechanical properties and UV stability of various multicomponent polymer systems. This paper focuses on the applicability of this principle for improving the performance of intumescent flame‐retardant systems using melamine‐treated…
The first synthesis and characterization of gold−silica core−shell nanoparticles with a mercaptosilane interface between the core and shell is reported. These nanoparticles exploit the strong interaction between thiols and gold to create a well-defined interface of functional group organization between core and shell.…
Crystalline nanobelts of ZnO and SnO2 were prepared from a thermal evaporation of oxide powders inside an alumina tube in the absence of catalysts. Typical dimensions of the nanobelt samples ranged from approximately 10 to 100 microns in length, 30 to 300 nm in width, and 6 to 30 nm in thickness. Room temperature Rama…
In the present study the thermal decomposition of a freeze-dried copper(II) acetate monohydrate powder, (CH3COO)2Cu.H2O, (FDCuAcH2O), was analysed by a combination of high-temperature X-ray diffractometry; differential scanning calorimetry and thermogravimetry, up to 700 °C. The structure and morphology of the calcine…
Cu x S ( x → 2) thin films were obtained by sulfidization of copper thin films previously obtained by spin-coating from a dichloromethane solution of [Cu(II)(2-ethyl hexanoate) 2 (H 2 O) 2 ] deposited on ITO substrate, irradiated with UV light and electrochemically reduced. Through cyclic voltammetry experiences perfo…
Proton-controlled reversible inter-conversion between an achiral CuII molecular square, and a 1D spontaneously resolved chiral interpenetrated double-chain with Cu4 cavities, based on bis(3-propionyloxy)-1,5-diazacyclooctane (H2L), has been successfully achieved.
Survey studies of pressure−temperature-induced transformations of single-wall carbon nanotubes (SWNT) at 1.5, 8.0, and 9.5 GPa and temperatures ranging from 200 to 1500 °C in a piston-cylinder or “Toroid” type high pressure devices have been carried out. It was found that the combined effects of high pressures and hig…
To study structural changes with changing chemical composition in the octahedral sheet of trioctahedral potassium-rich 1M micas, 3 natural and 12 synthetic micas were examined by singlecrystal X-ray diffraction. Samples with Ni 2+ , Mg 2+ , Co 2+ , Fe 2+ , and Al 3+ in the octahedral sheet and with Si 4+ , Al 3+ and o…
The reaction of the (101̄4) calcite surface during dissolution was studied as a function of pH (HCl) by liquid-cell Atomic Force Microscopy (AFM) under ambient conditions of both temperature (22 °C) and partial pressure of carbon dioxide (P CO2 ). A flow through AFM liquid reaction cell was used, and solutions were re…
Based on a biomimetic design, Si 3 N 4 /BN composites with laminated structures have been prepared and investigated through composition control and structure design. To further improve the mechanical properties of the composites, Si 3 N 4 matrix layers were reinforced by SiC whiskers and BN separating layers were modi…
An Anderson-type polyoxometalate, [IVIIMo6O24]5–, has been used as a catalyst for the aerobic oxidation at 80 °C of vicinal diols (glycols). This is the first report on the use of such a polyoxometalate as an oxidation catalyst. Reactivity and selectivity were dependent on the substrate. Thus, aryl-substituted diols y…
The amination of ketoacids to amino acids by pyridoxamine is greatly accelerated when the pyridoxamine is covalently linked to polyethylenimine carrying N-methyl and N-lauryl groups. Michaelis-Menten kinetics is seen with all substrates, from which the effect of the lauryl groups and the methyl groups can be determine…
This paper proposes a model of core-type distribution transformers for electromagnetic (EM) transient studies. The model accurately reproduces not only the impedance characteristics seen from each terminal of a core-type distribution transformer but also the surge-transfer characteristics between the primary and secon…
Breakdown theories yield a specified time to breakdown for fields exceeding a critical value, whereas experiment shows that times-to-breakdown and breakdown fields are different on a sample-to-sample basis. This has forced the use of a statistical approach to failure, often without a clear physical understanding of th…
Itaconate is known as a potent inhibitor of isocitrate lyase. Unexpectedly, itaconate was a strong inhibitor of acetate and propionate assimilation in isocitrate lyase-negative purple non-sulfur bacterium Rhodospirillum rubrum. It was shown that in cell extracts of R. rubrum itaconate inhibited propionyl-CoA carboxyla…
The tetrameric titanium alkoxide (MeC(CH2-μ3-O)(CH2-μ-O)2)2Ti4(O-i-Pr)10 (1) catalyzes the ring-opening polymerization (ROP) of lactide (LA) in toluene solution at various polymerization temperatures, and its bulk ROP at 130°C. Compound 1 facilitated reasonably controlled polymerization characteristics via a coordinat…
Literature data for the electrical resistivity of austenitic and ferritic steels are analyzed in a model that takes into account their composition and microstructure. The resistivity in these systems is so high that one must allow for its saturation. That effect is described with the shunt-resistor model, and saturati…
Nanocrystalline silver particles were prepared via a supercritical fluid processing technique RESOLV (Rapid Expansion of a Supercritical Solution into a Liquid SOLVent) coupled with chemical reduction. The preparation involved the rapid expansion of a supercritical ammonia solution of silver nitrate into an ambient so…
A range of mesogenic molecules varying in both bend angle and strength of lateral dipole were synthesized, and their phase behavior was characterized by polarizing microscopy, thermal analysis, X-ray diffraction, and electrooptical measurements. We find the general destabilization of the liquid crystallinity caused by…
The optical absorption spectra of Ag 0, Ag 2 +, transient oligomers, and stable clusters were studied in deaerated methanol by pulse and γ-radiolysis methods and compared with data obtained from studies using other solvents. From the decay of e - solv at 620 nm, the formation rate constant of Ag 0 was determined to be…