Materials Literature
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The frequency dependences of the imaginary and real parts of complex dielectric permittivity inherent to planarly aligned layers of nematic liquid crystals 5CB doped with multiwalled carbon nanotubes (CNT) were investigated in a wide range of frequencies (f = 10 -2 -10 6 Hz) and CNT concentrations (c = 0-0.25 wt.%). I…
We present heat-capacity measurements of the upper critical fields of single-crystal ${\text{NdFeAsO}}_{1\ensuremath{-}x}{\text{F}}_{x}$. In zero-magnetic field a clear step in the heat capacity is observed at ${T}_{c}\ensuremath{\approx}47\text{ }\text{K}$. In fields applied perpendicular to the FeAs layers the step…
Porous silicon (PSi) is a promising biomaterial presenting the advantage of being biocompatible and bioresorbable. Due to the large specific surface area and unique optical features, these microporous structures are excellent candidates for biosensing applications. Investigating device functionality and developing sim…
It is widely recognized that further extension of optical lithography to even smaller dimensions will be accompanied by rapid increasing cost and difficulty. There is growing interest in devising alternative patterning methods that will support the evolution of microelectronics to the 10nm length scale. Block copolyme…
Cluster's last stand: The hydrated gallium/indium nanocluster [Ga7In6(μ3-OH)6(μ-OH)18(H2O)24(NO3)15] was prepared in a facile, high-yielding synthesis. The use of a key nitroso-containing organic compound as an additive allows for the isolation of multiple grams of the cluster. This larger-scale synthesis facilitates…
Band-edge liquid crystal lasers are of interest for a number of applications including laser projection displays. Herein, we demonstrate simultaneous red-green-blue lasing from a single liquid crystal sample by creating a two-dimensional laser array fabricated from dye-doped chiral nematic liquid crystals. By forming…
A new family of oxypnictide superconductors, LaFeAsO0.89F0.11, brings new impetus to the field of high-temperature superconductivity. In this work, we show that the upper critical field values Hc2 (48 K) = 13 T and Hc2(0) can exceed 80–230 T in a high-pressure-fabricated NdO0.82F0.18FeAs bulk sample with Tc of 51 K. W…
$2p$-based magnetic moments and magnetic coupling are studied with density-functional-based methods for substitutional N in the alkaline earth monoxide series MgO, CaO, SrO, BaO. The hole is rather strongly localized near the ${\text{N}}^{2\ensuremath{-}}$ ion, being somewhat more so when strong on-site interactions a…
Chemoselective cross-coupling reactions were demonstrated for C-S bonds in the BODIPY dyes 1 and 4, and similar reactions were applied to make the two-dye cassette system 11.
We have combined optical characterization with a magnetic actuation technique to measure the stiffness of single-walled carbon nanotubes of defined crystal structure. The measured stiffnesses correspond to an average Young's modulus of E = 0.97 +/- 0.16 TPa. For the structures investigated, no dependence on the nanotu…
What, where, when: A combination of both surface-sensitive (diffuse reflectance infrared Fourier transform spectroscopy, DRIFTS) and bulk-sensitive (Raman spectroscopy) detection at different catalyst-bed positions is shown to be a powerful tool to facilitate deeper understanding of complex dynamic surface and bulk pr…
CdSeS/CdS/ZnS quantum dot thin films subjected to ZnO atomic layer deposition at 100°C shows photoluminescence (PL) modulation. The PL is quenched during each exposure to diethyl zinc. However, the PL is restored upon subsequent exposure to water.
We have investigated normal and resonant Raman scattering in Me-doped ZnO nanorods (Me = Mn, Co, Cu and Ni) prepared by thermal diffusion. Experimental results show that the normal Raman spectra consist of the conventional modes associated with wurtzite ZnO and impurity-related additional modes. Under resonant conditi…
The stability of superhydrophobic properties of eight plants and four technical surfaces in respect to water condensation has been compared. Contact and sliding angles were measured after application of water drops of ambient temperature (20 degrees C) onto cooled surfaces. Water evaporating from the drops condensed,…
We review our recent studies towards the molecular understanding of mechanical properties–structure relationships of elastomers using model polydimethylsiloxane (PDMS) networks with controlled topology. The model elastomers with controlled lengths of the network strands and known amounts of cross-links and dangling ch…
The method of activated swelling of polymer particles developed by the authors allows the preparation of monodisperse spherical beads of predictable size from 1 to 100 microns in diameter. The polymer particles may be prepared from a number of different monomeric materials and with various morphologies including macro…
Optical analysis of roughness operating on the principle of chromatic aberration and dynamic wetting measurements have been used to investigate the surface properties of polyester fabrics with different woven structures. The results revealed differences in the two basic types of weave — plain and twill — with respect…
It is important to understand the process of evaporation and steam transfer through firefighter protective clothing in order to be able to prevent steam burns. As humidity sensors are too slow to measure fast changes of humidity inside the clothing layers, temperature changes were used to analyze the evaporation of mo…
The crystallization behavior and the crystalline structure of nylon6-clay nanocomposites are investigated with regard to the processing conditions and thermal treatment. Microextruded bulk samples as well as blown films are under concern. The often reported nucleating effect of the clay particles is shown to strongly…
Tiopronin (N-(2-mercaptopropionyl)glycine)-protected gold nanoparticles (TPAu) were cross-linked to collagen via EDC (1-ethyl-3-(3-dimethyl aminopropyl) carbodiimide) coupling. On average, each TPAu forms eight amide bonds with collagen lysine moieties. The resulting gels were studied with environmental SEM, TEM, micr…