Materials Literature
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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…
Co 0.2 Zn 0.8 Fe 2 O 4 nanoparticles have been synthesized by the coprecipitation method. Nanoparticles with average particle size of 5–∼65 nm were obtained by sintering the samples from 393 to 1173 K. Magnetic measurements show that samples with particle size ⩽13 nm are superparamagnetic above the blocking temperatur…
Porous silicon (PS) based metal/PS/p-Si structures with PS layer of different thickness were prepared on moderate- and high-resistivity substrates. Measurements of current–voltage (I–V) characteristics and impedance at various temperatures were used for the investigation of the electrical properties of these structure…
Defined porosity in the low-nanometer range is exhibited by easy-to-modify template materials, which can be prepared from mesoporous polystyrene monoliths. These are readily accessible by a mild hydrolysis reaction of a poly(styrene-b-lactic acid) precursor (see picture)
Density functional theories such as the Poniewierski–Stecki theory relate the elastic properties of \nnematic liquid crystals with their local liquid structure, i.e., with the direct correlation function \n~DCF! of the particles. We propose a way to determine the DCF in the nematic state from \nsimulations…
We have investigated the conductivity and photoconductivity response of undoped and Li-doped ZnGa2O4 epitaxial films grown using pulsed-laser deposition. A significant enhancement of the ultraviolet (UV) photoresponse is observed with Li doping that also correlates with an enhanced luminescent intensity. The wavelengt…
Hydrolysis of the new metallorganic precursor Fe(OBut)2(THF)2 followed by ultrasound and thermal treatment yielded either nanoparticles of γ-Fe2O3 or Fe3O4, depending on the process conditions. The samples have been characterised by X-ray powder diffraction, TEM, SEM, Mössbauer spectroscopy and magnetization measureme…
Fullerene-like CNx (x≈0.12) thin solid films were deposited by reactive magnetron sputtering of graphite in a nitrogen and argon discharge on cleaved NaCl and Si(001) substrates at 450 °C. As-deposited films consist of 5 nm diam CNx nano-onions with shell sizes corresponding to Goldberg polyhedra determined by high-re…
The field emission from aligned multiwalled carbon nanotubes prepared by thermal chemical vapor deposition of Fe-phthalocyanine is reported, with emphasis on the current–voltage characteristics and current fluctuation. By running of a pristine emitter at high current and/or voltage for a long time, the onset voltage i…
The CeIII, PrIII, NdIII, GdIII and YbIII complexes of the heptadentate ligand 2,2´,2´´-tris(salicylideneimino) triethylamine, H3trensal (in its trianionic form), have been synthesized and characterized structurally by X-ray crystallography. These five [Ln(trensal)] structures complete a rare isomorphous and isostructu…
The clean Cu/diamond(111) work of separation is found to be $1.30\mathrm{J}/{\mathrm{m}}^{2}$. Copper $d$ and diamond $p$ states play a significant role in forming relatively strong Cu/diamond interfacial bonds, while reconstruction of the free diamond(111) surface lowers the work of separation. The single dangling bo…
The influence of the addition of small quantities of anisotropic layered silicates on the ordering of block copolymers is studied by a combination of linear viscoelasticity and small angle neutron scattering. Specifically, we examine the influence of varying the lateral dimensions of thermodynamically roughly equivale…
Recent experiments on mixtures of rodlike and platelike colloidal particles have uncovered the phase behavior of strongly asymmetrical rod-plate mixtures. In these mixtures, in which the excluded volume of the platelets is much larger than that of the rods, an extended isotropic (I)–plate-rich nematic (N−)–rod-rich ne…
AgInSbTe films have recently attracted considerable interest as advanced materials for phase change recording. For this application the determination of crystallization kinetics is of crucial importance. In this work the temperature dependence of structural and electrical properties of sputtered AgInSbTe films has bee…
We address several general questions about quantum transport through molecular systems by an ab initio analysis of a scandium-nitrogen doped ${C}_{80}$ metallofullerene device. Charge transfer from the ${\mathrm{Sc}}_{3}\mathrm{N}$ is found to drastically change the current-voltage characteristics: the current through…
We investigate physical properties of polymer dispersed liquid crystal transmission gratings which influence the light diffraction efficiency behavior. Scanning electron microscopy is used to determine the orientation and shape of nanometer-sized liquid crystal droplets in a polymer host. Dependence of diffraction eff…