Materials Literature
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PhotoDSC has been applied to follow the global kinetics of chain scissions resulting from the UV light irradiation or from the thermal degradation of a high molecular weight PEO (4 x 10(6) g x mol(-1)). Infrared spectroscopy, XRD measurements and rheology experiments were performed to evidence the occurrence of chain…
The rotational power losses measured in the clockwise and anticlockwise directions differ noticeably. There are many factors that contribute to this difference, but these have not previously been explained in the literature. A discussion on the physical phenomena that contribute to the power loss along with the experi…
Internal friction and dynamic shear modulus in an indium–21 at.% thallium alloy were measured as functions of frequency and cooling rate using broadband viscoelastic spectroscopy during the martensitic transformation which occurs in this material occurs around 50°C. Microstructural evolution of martensitic bands was c…
Oxo-acetato-bridged triruthenium cluster complexes ([Ru3(mu3-O)(mu-CH3CO2)6(L1)(L2)2](+/0)) show various color changes with variations of the total charge of the cluster complexes and terminal ligands. After photosensitized electron transfer via the triplet excited state of zinc tetraphenylporphyrin, the change of the…
The nature of low- and high-temperature anomalies in electrical properties of LaSr(Ca)MnO films with clusterized structure is investigated. Results concern the cluster sizes $D=100--150\phantom{\rule{0.3em}{0ex}}\mathrm{\AA{}}$, in which charge quantization is of importance but quantum confinement does not yet have an…
We show using density functional calculations that the small e'g Fermi surfaces in NaxCoO2 are destroyed by Na disorder. This provides a means to resolve the prediction of these sections in band structure calculations with their nonobservation in angle resolved photoemission experiments.
In the present work we report on the most recent development at ENEA on the synthesis and the characterization of Ionic Liquids for use as electrolytes or electrolyte components in lithium metal batteries and hybrid supercapacitors.
The electrochemical impedance diagrams obtained at the corrosion potential for pure Mg or for AZ91 alloy presented the same shape after an immersion time of few days. It was thus assumed that the magnesium matrix of the AZ91 alloy corrodes first. The diagrams are characterized by two capacitive loops and an inductive…
In recent years, there has been an increasing demand for micro-vibration free space from industrial and scientific organizations. In response to this demand, several active micro-vibration control systems utilizing various types of actuators have been developed and applied in various environments and to a number of ma…
It is well known that the rotational power loss differs if the flux vector is rotated in either a clockwise or an anticlockwise rotation direction. An analysis is presented that shows that averaging the clockwise and anticlockwise values introduces an additive error that is dependent on the angular misalignment betwee…
The synthesis and spectroscopic characterizations of size-controlled Cu nanoparticles forming self-assembled 2D superlattices with hexagonal packing are described. The scanning electron microscopy (SEM), nuclear magnetic resonance (NMR), thermal gravimetric analysis (TGA), and electron spectroscopy for chemical analys…
Phosphorous nitrogen compounds, so-called phosphazene, act as a novel flame-retardant additive for the electrolytes of lithium ion (Li-ion) batteries without hampering electrochemical performances. In particular partially fluorinated phosphazene compounds show excellent ability for safety usage of the Li-ion battery.
Density functional theory (DFT) calculations are used to investigate dimerization, by acid condensation, between Lindvist and Keggin cluster anions. When specific addendum atoms are present (notably, Ti, V, Nb, and Cr), these clusters dimerize in the presence of acid via the formation of mu-O linkages. These processes…
[reaction: see text] We have synthesized novel spiro-bridged chromophores incorporating a 4,5-diazafluorene unit as the electron acceptor (A) and aryl amino groups as donor (D) moieties. The orthogonal D-A configuration limits ground-state D-A interactions but allows efficient PET reactions. The PET efficiency was mod…
Two reaction schemes were developed to covalently graft poly(ethylene glycol) (PEG) chains on poly(ethylene-co-acrylic acid) (EAA) surfaces. The schemes involved surface grafting of linker molecules L-lysine or polypropyleneamine dendrimer (AM64), with subsequent covalent bonding of PEG chains to the linker molecules.…
Detailed microscopic study of the crystal field strength $10Dq$ and lowest charge transfer (CT) energies for different interionic distances in ${\mathrm{Cs}}_{2}\mathrm{NaY}{X}_{6}:{\mathrm{Cr}}^{3+}\phantom{\rule{0.3em}{0ex}}(X=\mathrm{F},\phantom{\rule{0.3em}{0ex}}\mathrm{Cl},\phantom{\rule{0.3em}{0ex}}\mathrm{Br})$…
The dynamic internal variables which control plastic flow can only be assessed by dynamic materials testing at any given instance. The testing method championned by our studies has been precision strain rate sensitivity (PSRS) whereby the change in flow stress due to a set change in strain rate is taken to be an opera…
New organic materials for the purpose of high speed capacitor applications are discussed. The effect of the microcrystalline size dependence of different polyaniline polymeric systems on the dielectric constant is investigated. Two different methods are described for the preparation of the polyaniline dielectric mater…
Electrical and morphological properties of poly(3,4-ethylenedioxythiophene) (PEDOT) thin films electrodeposited on gold-on-silicon electrodes by galvanostatic, potentiostatic, and potentiodynamic methods have been determined using current sensing atomic force microscopic experiments. Surface morphologies and vertical…
The electronic structures of four members of the electron-transfer series [Fe2(1L)4]n (n = 2-, 1-, 0, 1+) have been elucidated in some detail by electronic absorption, IR, X-band electron paramagnetic resonance (EPR), and Mössbauer spectroscopies where (1L)(2-) represents the ligand 1,2-bis(4-tert-butylphenyl)-1,2-eth…