Materials Literature
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We provide the first evidence that the size (diameter) of carbon nanotubes (CNTs) is a key factor governing their antibacterial effects and that the likely main CNT-cytotoxicity mechanism is cell membrane damage by direct contact with CNTs. Experiments with well-characterized single-walled carbon nanotubes (SWNTs) and…
This paper investigates the electronic properties of single-walled carbon nanotube field-effect transistors (SWCNT-FETs) in which the SWCNT element is coated with a charged dielectric. The presence of remote charge on the surface of the dielectric is considered to effect carrier transport in the nanotube as a result o…
The molecular dynamics of discotic liquid crystalline hexa-peri-hexabenzocoronenes (HBC-C 10,6 and HBC-C 14,10 ) with long alkyl side chains branched in close vicinity to the HBC aromatic core were studied by dielectric spectroscopy. The two compounds display a weak dipolar relaxation (a-process) manifested by a Vogel…
Results are given of an experimental study of the temperature dependence of isobaric heat capacity of E635 alloy in the temperature range from 320 to 1170 K. Special features characteristic of the realization of the method of adiabatic calorimetry are described. It is demonstrated that the monotonicity of the temperat…
Abstract In der Natur konnte Chitosan bisher nur in den Zellwänden weniger Pilze (z. B. Mucorales) gefunden werden. Auf Grund struktureller Eigenschaften, der geringen Toxizität, Biokompatibilität und biologischen Abbaubarkeit besitzt Chitosan ein breites Anwendungspotenzial. Wegen entfallender Entsorgungs‐ und Umwelt…
The principal aim of this work is a comprehensive analysis of the phase diagram of water via the van der Waals like equations of state (EoSs) which are considered as superpositions of repulsive and attractive forces. We test more extensively the modified van der Waals EoS (MVDW) proposed by Skibinski et al (2004 Phys.…
The crystal structure of the low-temperature forms of the Cs 3 PO 4 and Rb 3 PO 4 orthophosphates has been determined for the first time by neutron diffraction using the Rietveld method. Cs 3 PO 4 and Rb 3 PO 4 are shown to be isostructural with K 3 PO 4 : orthorhombic cell (sp. gr. Pnma, Z = 4); lattice parameters a…
Silica-filled epoxy composites represent an important class of electronic packaging materials. In this paper, a series of semi-empirical equations are proposed for estimating the density, temperature-dependant modulus, expansion coefficient and Poisson's ratio of silica-filled epoxy composites as a function of the sil…
It is well known in the literature that carbon nanotubes (CNTs) interact weakly with many gas molecules like${\rm H}_{2}{\rm O}$,${\rm O}_{2}$, CO,${\rm NH}_{3}$,${\rm H}_{2}$, and${\rm NO}_{2}$, to name a few. Exposure to${\rm NO}_{2}$,${\rm O}_{2}$, and${\rm NH}_{3}$significantly affects the electrical conductance o…
A realistic single-wall carbon nanotube (SWCN)-metal contact configuration is obtained using a tight-binding molecular dynamics method incorporating full consideration of s, p, and d basis sets for carbon and metal atoms. The full structural relaxation of the combined SWCN and metal system is found to be essential for…
Three novel tri-dimensional phthalocyanine polymers, with lanthanum (LaPPc), gadolinium (GdPPc) and ytterbium (YbPPc) as centric atoms, have been synthesized from a tetranuclear phthalonitrile. Third-order optical nonlinearities of these compounds in DMF solution are measured by a picosecond Z-sacn technique at 532 nm…
We observed a strong modulation in the current-voltage characteristics of $\text{Sr}{\text{RuO}}_{3}/\text{Nb}:{\text{SrTiO}}_{3}$ Schottky junctions by Mn substitution in ${\text{SrRuO}}_{3}$, which induces a metal-insulator transition in the bulk. The temperature dependence of the junction ideality factor indicates…
The pressure- and temperature-dependent properties of molten zinc chloride are investigated by means of molecular dynamics computer simulation. The potential model used is based on a pair potential augmented with a description of the (many-body) anion polarization. The static experimental and simulated structural prop…
In 6 Se 7 thin films of different thicknesses were prepared by the thermal deposition technique. Structural studies show that In 6 Se 7 thin films have a polycrystalline nature of the monoclinic phase: its lattice parameters a , b , c and β were calculated for the first time. The thermoelectric power (TEP) measurement…
The optical and electrical properties of the as-prepared and annealed SnxSb20Se (where x = 8, 10, 12, 13.5, 15, 16.5 and 18 at.%) thin films were studied. X-ray diffraction showed that all the as-prepared Sn-Sb-Se films were amorphous. Annealing the films at 473 K or above crystallized the films and the degree of crys…
The wet air oxidation of benzene has been studied in a 1.24 L stainless steel autoclave at a temperature in the range of 190−260 °C. The oxygen partial pressure was varied from 0.69 to 1.72 MPa. The initial C 6 H 6 concentration was 5.63 mmol/L. The influence of the pH was studied, and the main reaction intermediates…
We show that the deposition of poly(isoprene- b -ethylene oxide) block copolymer (PI−PEO) micelles on freshly cleaved mica produced ultraflat, polymer nanoislands of well-defined monomolecular thickness. The islands were partly adsorbed and partly floating on the substrate, and their morphology changed over time (unde…
A series of four (CaO)x(Al2O3)(1−x) glasses over the narrow compositional range x = 57.1–66.7 have been studied using high energy x-ray and neutron diffraction. The coordination number of oxygen around aluminum was determined as 4 at all compositions. The coordination number of oxygen around calcium was extracted usin…
High energy x-ray diffraction measurements have been performed on CaO–Al 2 O 3 liquids suspended in a flow of pure argon for six compositions containing 50–67 mol% CaO. The results indicate that AlO 4 tetrahedra dominate the liquid structure. The radial distribution functions show a significant broadening of the Ca–O…
ZnO spheres and pseudospherical structures have been synthesized by a surfactant-free wet chemical method. The products were formed by a dissolution/reprecipitation mechanism. Room temperature ferromagnetism has been observed in the products, which could be affected not only by annealing but also by ultrasonic treatme…