Materials Literature
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We developed a consistent mathematical model for isotropic crystal growth on a substrate covered by the mask material with a periodic series of parallel long trenches where the substrate is exposed to the vapor phase. Surface diffusion and the flux of particles from vapor are assumed to be the main mechanisms of growt…
Magnetic susceptibility $χ$ of pristine and brominated arc-produced sample of multiwall carbon nanotubes was measured from 4.2 to 400 K. An additional contribution $Δχ(T)$ to diamagnetic susceptibility $χ(T)$ of carbon nanotubes was found at T $<$ 50 K for both samples. It is shown that $Δχ(T)$ are dominated by quantu…
This paper concerns optical properties of the isotropic phase above the isotropic-cholesteric transition and of the blue phase BP III. We introduce an effective index, which describes spatial dispersion effects such as optical rotation, circular dichroism, and the modification of the average index due to the fluctuati…
Abstract The bulk magnetic susceptibility (BMS) shifts of 1 H NMR resonance signals for inert reference compounds caused by the addition of paramagnetic lanthanide(III) compounds were exploited in order to determine lanthanide(III) concentrations in solution. The BMS shifts of an inert reference compound in the sample…
The population of valence-band electronic states of single-walled carbon nanotubes (SWCNTs) was tuned electrochemically in acetonitrile electrolyte solution. In dry and oxygen-free solution, the electrochemistry of SWCNTs is controlled by capacitive charging. Reversible changes of intensity and frequency of the Raman…
A Fourier analysis of the de Haas--van Alphen (dHvA) oscillations in a two-dimensional (2D) electron system with background (magnetically unperturbed) reservoir states is presented. The method is exploited in a systematic study of the various wave forms of the oscillations observed in dHvA and Shubnikov--de Hass measu…
Metalorganic-decomposition-derived SrBi2Ta2O9 (SBT) ferroelectric thin films, sandwiched between Pt electrodes, were imprinted by heat treatment at 130 °C in air. The aging behavior at room temperature of these imprinted SBT capacitors was observed. The voltage shifts of imprinted P–V hysteresis loops increased with t…
A “grafting” method for creating new polymer/V2O5/carbon structures with nanodimensions results in materials that are chemically tailored to exhibit fast ion/electron transport. The rate responses are high enough to be of interest in applications such as lithium batteries and supercapacitors, and the concept is applic…
We describe and characterize a simple process for the fabrication of patterned materials on polychloromethylstyrene thin film surfaces under ambient conditions. Patterned deep UV exposure (approximately 60 mJcm(-2), 193 nm) efficiently oxidizes the surface C-Cl bonds of the polymer film, producing an aldehyde species…
The adsorption and chemical transformation of iodoethane were studied on a Si(100)-2×1 surface using multiple-internal reflection Fourier-transform infrared spectroscopy (MIR-FTIR). The C–H and Si–H stretch vibrations served as fingerprints of all surface transformations. Although ethyl groups are stable on the Si(100…
Polyelectrolytes functionalized with photoisomerizable azobenzene chromophores were multi-layered onto inorganic and metal surfaces, by the repeated adsorption from dilute aqueous solution, alternating between oppositely charged polymers. These layer-by-layer ionically self-assembled thin films were investigated for t…
We have studied the growth and the properties of (t)a-C:F films prepared by the deposition of mass separated 12C+ and 19F+ ions as a function of the F concentration. The films are always strongly F deficient due to the formation of volatile F2 and CFx molecules during the deposition process. A maximum F content of abo…
Porosity and acidity of molecular sieve Al-MCM-41 (ca. 30 A pore diameter) plays a crucial role in the synthesis of novel calix(4)pyrroles; for the first time, Al-MCM-41 has been used as a solid acid catalyst to produce a number of calix(4)pyrroles with good selectivity ad yields where zeolite HY (ca. 7.6 A pore diame…
Electrochemical evidence of H. produced by cavitation as the result of ultrasonic irradiation of an aqueous solution is presented.
An insulated nanotube wire is formed by the binary phase of layered tungsten disulphide and carbon nanotubes (shown in the HRTEM image) generated by the sulphidization of tungsten oxide coated multiwalled carbon nanotubes at 900 °C. Thermogravimetric analysis shows that the tungsten disulphide coat acts as an antioxid…
To gain insight into the molecular aspects of unfolding/refolding of enzymes from extremophilic organisms, we have used xylanase from an alkalophilic thermophilic Bacillus as the model system. Kinetics of denaturation/renaturation were monitored using intrinsic fluorescence studies. The protein fluorescence measuremen…
Structural and electronic properties of semiconductor binary microclusters ${A}_{m}{B}_{n}$ $(A,B=\mathrm{S}\mathrm{i},\mathrm{G}\mathrm{e},\mathrm{C})$ have been investigated using the B3LYP-DFT method in the range $s=m+n<~10.$ Full structural optimization and frequency analyses are performed with the basis of $6\…
A laterally segregated diffusion barrier was investigated for Cu metallization. In this scheme, the intended final structure is composed of two different barrier materials; one is the parent barrier layer (TiN, in our case) and the other (Al2O3, in this case) is segregated laterally along the grain boundaries of the p…
A polyimide that is designed to produce homeotropic liquid-crystal orientation is baked at high temperature and rubbed with a cotton cloth. It is found that the resulting pretilt angle of the liquid-crystal pentylcyanobiphenyl is continuously controllable from 0° to nearly 40°.
We present the model of a cylindrical pore with chains tethered by one end to its inner surface. The conformational and “quasistatic” (under low and medium shear rates) hydrodynamic properties of the system are studied. Since it was shown by other researchers that the density profile of the polymer layer is only sligh…