Materials Literature
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Third-order optical nonlinearities of several polymer films doped with naphthalocyanine derivatives have been measured under resonant conditions by femtosecond degenerate four-wave mixing (DFWM). The metal substitution and the peripheral groups influence both the magnitude and the response of the third-order optical n…
On the Ag(111)-p(4x4)-O surface SO2(g) reacts with oxygen according to SO2(g)+O(a)-->SO3(a). Sulfite forms in a (2 radical3x2 radical3)R30 degrees structure. The restructuring of the surface atoms during sulfite formation is indicative of the deconstruction of the p(4x4)-O structure. Heating the sulfite-covered surfac…
An effective method, i.e., the solid atom method, is suggested to obtain the Coulomb interaction parameter, U, and the Hund exchange coupling constant, J, for use in the LDA+U calculation. The par~meters are obtained self-consistently during the LDA+U calculation. The method is applied to typical transition metal oxid…
High-energy electrons may be elastically and inelastically scattered by a solid. To a good approximation the effect of inelastic scattering on the elastically scattered electrons may be taken into account using the concept of the complex optical potential. The optical potential may be calculated using electron atomic…
Abstract Low‐molecular‐weight organic acids with one or more carboxylic groups are ubiquitous. In soils, they can originate from leaching of plants, litter decomposition, plant‐roots exudation, and microbial activity. Their presence in the soil may favor the formation of soluble organo‐metallic complexes that improve…
The fairly recent discovery of "quasi-crystals", whose X-ray diffraction patterns reveal certain peculiar features which do not conform with spatial periodicity, has motivated studies of the wave-dynamical implications of "aperiodic order". Within the context of the radiation properties of antenna arrays, an instructi…
Poly(o-anisidine) (POA) coatings were synthesised on low carbon steel substrates by electrochemical polymerisation of o-anisidine under cyclic voltammetric conditions from an aqueous solution of sodium tartrate. The resulting POA coatings were uniform and strongly adherent to the substrates. The coatings were characte…
This paper presents laboratory results of titanium passivated and chromium passivated tinplate specimens lacquered in industrial lines. The lacquered materials were characterised and evaluated in terms of the chemical characteristics of the lacquer; its degree of curing; adhesion; porosity; corrosion resistance in syn…
The orthoconic antiferroelectric Sm C* A phase is of high potential for electro-optic applications. Therefore, mixtures of calamitic molecules possessing the Sm C* phase with high tilt angle (Θ ≈ 45°) and bent core compounds have been prepared. The induction of an antiferroelectric phase has been found even at low con…
Creep behaviour of a SiC f ‐SiBC composite has been investigated in tension at high temperature under an oxidative environment. A multiscale and multitechnique approach has permitted to understand the creep mechanism of this material and particularly the influence of oxidation on the behaviour. A creep mechanism has t…
Abstract The electrical conductivity and thermal expansion of La 2 Mo 2 O 9 under low oxygen partial pressure were studied with the help of thermoelectric power and dilatometric measurements, respectively. The ionic conduction of La 2 Mo 2 O 9 was predominant with the electronic transference number less than 0.05 abov…
New spiropyrans of indoline and benzoxazinone series were synthesized. Photochromic properties of this compounds in thin solid films have been investigated.
Epitaxial La0.8Ag0.1MnO3+δ film with variant structure on ZrO2(Y2O3) substrate was grown for the first time, and the optical, magnetooptical, and transport properties of this film were studied in order to elucidate special features in the mechanism of conductivity and magnetoresistance (MR) in this film. An original m…
We report the synthesis and evaluation of thermal behaviour of two novel series of chalcone-based liquid-crystalline compounds. The flexibility in these systems is provided by attaching straight alkoxy chain at one end. All the mesogens have been characterized by spectroscopic methods such as 1H-NMR, FTIR, mass spectr…
We experimentally investigate the coupling rules between molecules and optical fields in the all-optical poling scheme. The efficiency and symmetry of the photoinduced quadratic nonlinearity is shown to be dependent on tensorial selection rules connecting the symmetries of the optical poling fields and the molecular t…
Stabilization of electroluminescence from nanocrystalline porous silicon diodes has been achieved by replacing silicon-hydrogen bonds terminating the surface of nanocrystalline silicon with more stable silicon-carbon (Si-C) bonds. Hydrosilylation of the surface of partially and anodically oxidized porous silicon sampl…
Members of the solid-solution series between erythrite [CO (ASO)2•8HO] and annabergite [Ni (AsO)2•8HO] were synthesized and studied by a combination of X-ray diffraction, scanning electron microscopy, and Raman and infrared spectroscopy. The solid solution is complete, with the space group C2/m (monoclinic) being reta…
While electrochemical etching of small samples in the 1 cm region is relatively easy, this is not true for large areas, i.e. standard wafer sizes up to 300 mm. The paper outlines the specific demands and difficulties in some detail, discusses large area etching strategies and systems, in particular for very deep macro…
This paper reports observations of significant synergistic effects between dielectric barrier discharge (DBD) plasmas and Cu-ZSM-5 catalysts for C2H4 selective reduction of NOx at 250℃ in the presence of excess oxygen by using a one-stage plasma-over-catalyst (POC) reactor. With the reactant gas mixture of 530ppm NO,…
Carbon nanotubes (CNTs) are excellent multifunctional materials in terms of mechanical robustness, thermal, and electrical conductivities. These multifunctional properties, as well as the small size of the structures, make CNTs ideal building blocks in developing nanocomposites. However, the matrix materials and the f…