Materials Literature
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A novel series of liquid crystalline compounds, N-(2-hydroxy-4-n-alkoxy-benzaldehydeimino)-2-benzamidoethanamide (habbe) (alkyl = octyl, nonyl and decyl), derived from (N-benzoyl)glycylhydrazide, have been synthesized and characterized. Trivalent rare earth metal complexes of the type [Ln(habbe)2Cl2)Cl·2H2O] (where Ln…
We have developed a liquid crystal (LC) device that is totally controlled using light. The initial alignment is made by optically buffing the azopolymer film with two coherent argon laser beams. Surface relief gratings have been optically induced on an assembled cell filled with LC. A single linearly polarized argon l…
We apply a film thickness-independent technique to measure the index of refraction n=n+ik for amorphous thin films of molybdenum trioxide. The films were grown by thermal evaporation and then colored by light irradiation for different exposure times. Data for the reflectivity and differential reflectivity yield n and…
A novel theoretical approach is suggested for the description of phase transitions and structures observed in antiferroelectric smectic liquid crystals. Allowance is made for two possible types of ordering: short-pitch and long-pitch helical modes. The thermodynamic behavior of the material is treated as a result of t…
Structural and compositional changes of Co phthalocyanine (CoPc) films irradiated by ultraviolet (UV) light of 7.21 eV using an excimer lamp and the corresponding photo-oxidation process have been investigated. Optical absorption and X-ray photoelectron spectroscopy (XPS) measurements showed that the CoPc molecules in…
We have studied the optical transmission of one-dimensional Fibonacci-class quasiperiodic multilayers, which possess a mirror symmetry. We find that the transmission coefficient is unity for all studied sequences at the central wavelength λ = λ 0 , where λ 0 = (1/4) n A(B) d A(B) with n A(B) and d A(B) being the index…
Infrared and FT-Raman spectra have been obtained on pyridine adsorbed within two siliceous materials, silicalite and MCM-41. Both spectroscopic techniques detect the presence of weak physisorbed pyridine and stronger hydrogen-bonded pyridine. In particular, the FT-Raman spectra are well resolved and can be used to mea…
Abstract A series of push-pull type 4-phenylaminoazobenzene derivatives bearing an electron-withdrawing 4′-substituent were probed by electronic spectra in solution. The visible absorption maxima of these azobenzenes were correlated with the solvent parameters through the McRae theory as well as the solvent donor numb…
Thin films of MgFe 2 O 4 spinel on a (001) substrate of MgO have been heated to elevated temperatures in an applied electric field. The externally applied electric field produces a large driving force that influences the kinetic behavior of the spinel film and results in the formation of an MgO layer at the cathode du…
The crystal structure of the synthetic Ge-modification of the mineral natisite, Na 2 { TiOGeO 4 }, has been refined by X-ray diffraction method (a four-circle diffractometer, 2θ/θ scanning, Mo K α -radiation, θ max = 50°: a = 6.658(1), c = 5.161(1) Å, sp. gr. P 4/ nmm , Z = 2, ρ calcd = 3.58 g/cm 3 , R 1 = 0.030, s =…
The effect of heavy boron doping on local lattice strain around platelet oxide precipitates in Czochralski silicon wafers was investigated quantitatively by convergent beam electron diffraction (CBED). Lightly boron doped (p−) polished wafers, including platelet precipitates with density of about 5×109/cm3 and with an…
This work characterizes influence of moisture absorption on damping of tennis rackets. Three thermoset and one thermoplastic matrix composites were used for making the rackets. The first is a carbon/epoxy system, and the second is similar except that the epoxy is a polyurethane-modified type. The third is an interleav…
Ba(Ti1-xZrx)O3 (x = 0.15 and 0.2) single crystal fibers were grown by the laser heated pedestal growth (LHPG) technique. The XRD results show that the grown crystals are of single phase. Temperature dependence of dielectric permittivity, room temperature hysteresis loops and strain were measured. A broad permittivity…
Transmission electron diffraction patterns from ultra-thin aromatic and aliphatic organic films at beam energies of 200 eV-1 keV have been recorded in a custom low energy electron transmission (LEET) chamber. A significant reduction of the molecular damage cross-section, measured by fading of diffraction spots, was fo…
Die Entwicklung von Kunststoffen hat der Welt äußerst haltbare und vielfältig einsetzbare Materialien geliefert. Durch die rasante Anwendung ,besonders als Einwegverpackungen,sind Kunststoffe jedoch längst zu einem Müllproblem geworden. Neue Polymere,die gezielt durch Mikroorganismen abgebaut werden können,sollen helf…
An accurate analysis of short circuit electromagnetic forces in a three-phase enclosure-type gas insulated bus (GIB) has been performed. The analysis clarified the effects of the eddy currents (skin effect) and the nonlinear permeability on the materials. The calculated magnetic fields agree with the measured fields.…
Localized corrosion, such as pitting and crevice/underdeposit corrosion, is responsible for the majority of plant equipment corrosion failures. However, the assessment of localized corrosion in plant operating conditions is often overlooked, partly because none of the techniques commonly used today can provide realist…
There is currently great interest in the use of lyotropic liquid crystals as templates for the production of mesoporous inorganic or metallic materials having uniform pore sizes in the range 20-100 Å or greater. Such materials have potential applications as catalysts, molecular sieves or electrodes, and can accommodat…
We describe a distinct nematic liquid crystal with ferroelectric ordering which is formed from the polar rod-like aromatic polyester. The nematic liquid crystal is biaxial and the polarity appears along both axes as determined by measurements of the second harmonic generation. The strong dipole-dipole interaction betw…
Nonlinear optical measurements are performed with a ferrolyotropic calamitic nematic mesophase with different relative concentrations of the mixture compounds. The frontiers of the nematic domain are determined using optical microscopy and x-ray scattering techniques. The thermal lens model is used to obtain the therm…