Materials Literature
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The synthesis of homoditopic heterocomplementary monomers forming sextuple hydrogen-bond-mediated self-assemblies in apolar solvents is described. The nanostructures of the fibrillar aggregates formed in decane solutions of such monomers were investigated by small-angle neutron scattering. The fibers were found to be…
Carbon nanotube field-effect transistors operate over a wide range of electron or hole density, controlled by the gate voltage. Here we calculate the mobility in semiconducting nanotubes as a function of carrier density and electric field, for different tube diameters and temperatures. The low-field mobility is a nonm…
A pressure-driven method was employed to immobilize enzymes on hydrophobic mesoporous silica supports. This approach gave rise to higher enzyme loading and reduced enzyme leaching, compared to conventional methods. Candida antarctica lipase B (CALB) was successfully entrapped in the cagelike pores of siliceous mesocel…
A rapid new method for preparation of monodisperse InP-nanocrystals was developed. A highly reactive indium precursor and tris(trimethylsilyl)phosphine (TMS)3P was reacted within a weakly coordinating solvent in the presence of a supporting protic agent. The yielded InP-nanocrystals had a very narrow size distribution…
This paper reports well-aligned arrays of CuO nanoplatelets synthesized through a hydrothermal route without template's assistance. The surface of well-aligned arrays of CuO nanoplatelets looks like a wall. These nanoplatelets, possessing four clear edges, are 50-80 nm in thickness, 150-250 nm in width, and 0.8-1.5 mi…
Rise-time distribution spectra of a polycrystalline chemical vapor deposited diamond detector were directly measured from alpha-particle induced pulse shapes over a temperature range of 240–280K. Pulses due to hole-dominated charge transport showed a strong delayed component due to thermal detrapping of charge from a…
Ceramic samples of SrBi 4− x Nd x Ti 4 O 15 (SBNT- x , x = 0.00–1.00) have been prepared by the conventional solid-state reaction method. As the Nd doping content increases from 0.00 to 0.18, the remnant polarization (2 P r ) increases steadily and reaches a maximum value of 25.8 µC cm −2 , which is almost 56% higher…
The rate of crystal nucleation of colloids and globular proteins can be enhanced by critical density fluctuations. It has been argued that a closely related phenomenon influences the rate of intramolecular "crystallization" of single-chain polymers. We report Monte Carlo simulations of the free-energy barrier that sep…
Transparent ZnO films with ferromagnetic spinel iron oxide particles (Fe 9.5 atom %) were prepared on glass substrates by a novel chemical process followed by heat treatment at 773 K under vacuum. The chemical process involved (i) ZnO deposition from an aqueous solution and (ii) the introduction of iron atoms into the…
The main aim of the work is to discuss ways of optimizing a single-yoke magnetization set-up with respect to fluctuations of the measurement results due to imperfections of the yoke?sample contact. The nondestructive testing method is proposed to be optimized by simultaneous multi-point determination of surface magnet…
[reaction: see text]. An efficient and general route to the soluble polymer-assisted synthesis of a set of 14 different N-substituted pyrroles using dendritic polyglycerol as a high-loading support is presented. The transformation of furan to the key intermediate 2,5-dialkoxytetrahydrofuran was performed by electroche…
We describe an experimental study of the dynamic structure factor of liquid glycerol performed by complementary inelastic techniques such as Brillouin visible, ultraviolet and x-ray scattering. The spectra have been collected as a function of both temperature and momentum transfer. The relevant hypersonic parameters a…
The molecular structures of the titanium(III) borohydride complexes Ti(BH4)3(PEt3)2 and Ti(BH4)3(PMe2Ph)2 have been determined. If the BH4 groups are considered to occupy one coordination site, both complexes adopt distorted trigonal bipyramidal structures with the phosphines in the axial sites; the P-Ti-P angles devi…
Triton X-100 is used as a surfactant to disperse carbon nanotube (CNT) bundles. Its influence on the transfer characteristics of carbon nanotube field-effect transistors (CNTFETs) fabricated with the dispersed CNTs by the AC dielectrophoresis technique has been studied. We find that the surfactant at the interface bet…
Heat capacity and magnetocaloric studies on the compounds RPd2Si (R = Dy,Tb and Gd) are presented. The zero-field heat capacity shows a clear peak around the magnetic transition temperature. The magnetic entropy change across the transition indicates a doublet ground state for TbPd2Si and a quartet ground state for Dy…
ZnO thin films were prepared from metallic zinc and metallic zinc + zinc nitride mixture by thermal oxidation. The DC-magnetron sputtering technique was used to deposit the films under argon and argon + nitrogen atmosphere, respectively. The oxide thin films prepared by this method have wurtzite structure without any…
Multi-walled carbon nanotubes (MWNTs) were functionalized via oxidative polymerization of 3 - 3'(vinylcarbazole) (PVK). Thin films of PVK-functionalized MWNTs (PVK-MWNTs) were fabricated by the Langmuir–Schaefer (LS) technique and characterized by spectroscopic, microscopic, electrical and electrochemical techniques b…
The transition metal pentatellurides HfTe5 and ZrTe5 have been observed to possess interesting electrical transport properties with high thermopower and low resistivity values leading to high thermoelectric power factors. We have investigated the effect of doping HfTe5 with rare-earth elements by measuring the power f…
Reactions of bis-(2-hydroxyacetophenone)trimethylenediimine (hapt) with cobalt cations lead to formation of two compounds [CoII(OAc)2(hapt)2Co(Py)2](ClO4)2 (1) and [CoIII(hapt) (OH)]2·2CH2Cl2 (2). The structure of 1 is a linear trinuclear mixed-valence compound, while 2 is a binuclear Schiff-base compound bridged by d…
Polyphosphazenes that bear both methoxyethoxyethoxy and cinnamyl side groups were synthesized and evaluated for use as hydrogels incorporated into micrometer-scale biosensor arrays. Polymers with the general formula [NPR x R‘ y ] n where R = OCH 2 CH 2 OCH 2 CH 2 OCH 3 and R‘ = OCH CHCH 2 Ph ( x = y = 1; x = 2, y = 0)…