Materials Literature
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Softwood and hardwood celluloses were oxidized by 2,2,6,6-tetramethylpiperidine-1-oxyl radical (TEMPO)-mediated oxidation. The TEMPO-oxidized cellulose fibers were converted to transparent dispersions in water, which consisted of individual nanofibers 3-4 nm in width. Films were then prepared from the TEMPO-oxidized c…
Imaging spectrometers can provide imagery and spectrum information of objects and form so-called three-dimensional spectral imagery, two spatial and one spectral dimension. Most of imaging spectrometers use conventional spectroscopic elements or systems, such as reflective diffraction gratings, prisms, filters, spatia…
We present a new mathematical technique which can be used to determine the main refractive indices and the birefringence of an anisotropic layer by using a polarizing microscope in conoscopic illumination. The values of the birefringence for the yellow radiation of a Na lamp are determined here for a Carpathian quartz…
Abstract Crosslinked polymethylhydrosiloxane (PMHS) thin films prepared by sol–gel polycondensation have been functionalized by Pt‐catalyzed hydrosilylation of SiH groups with an allyl ureido crown ether precursor. To this purpose, both 4′‐allylurea‐benzo‐15‐crown‐5 ( 1 ) and 1‐allyl‐3‐propyl‐urea ( 2 ) were synthesiz…
We show that by placing a single CdSe/ZnS quantum dot (QD) near a high-reflective optical mirror, both the photoluminescence intensity and the blinking statistics can be modified significantly and controlled deterministically by changing the dot-mirror distance. The modified local optical mode density in proximity to…
A transition in a spheroidal particle from the paraelectric to the ferroelectric phase as well as dynamic susceptibility are studied without approximation in the paraphase. It is assumed that the surface charge is compensated and the boundary condition for the polarisation is P = 0, i.e. with zero polarisation at the…
The ferroelectric crystal structure of SbSI is built of [Sb(S,I)]∞ chains parallel to [001] axis. In the paraelectric phase the crystal structure is disordered. Each atom is shifted from the xy mirror plane by Δ z up or down along [001]. The Reverse Monte Carlo (RMC) simulation of diffuse scattering revealed a complic…
We present the results of studies of the electromagnetic radiation (EMR) shielding by epoxy-nanocarbon composites (CMs). The EMR frequency range was 25.5–37.5 GHz. Thermoexfoliated graphite and multiwalled carbon nanotubes (CNT) have been used as fillers in CM (the content of a filler was 0.5–2 wt.%). We examined the…
For the visual express-control over animal product freshness, the sensor devices based on conducting polymer films (polyaniline, poly-o-methoxyaniline, and poly-o-toluidine) have been proposed. Sensor action is based on a change in the spectral properties and the corresponding color transitions in conjugate polymer fi…
Abstract During the last decade there has been continuously growing interest in the phenomenon of supramolecular chirogenesis, which is a smart combination of chirality and supramolecular chemistry effectively used for investigations of various aspects of living organisms, modern physical and naturalsciences, and also…
Abstract The cure characteristics and mechanical properties of blends consisting of hydrogenated natural rubber (HNR) and natural rubber (NR) blends were investigated. The HNR/NR blends at 50/50 wt ratio were vulcanized using various cure systems: peroxide vulcanization, conventional vulcanization with peroxide, and e…
The reconstructed geometries, surface energies, surfactant adsorption energies, and work function have been calculated for the nonpolar (101̅0) and (112̅0) surfaces of wurtzite CdSe. This study was undertaken in the framework of ab initio density functional theory. Passivation with an amine or phosphine group lowers t…
Although numerous papers on physical properties of the BaTiO 3 crystal can be found in literature, there is a lack of tentative studies of its properties in temperature range close to but above T C . That is why investigations of temperature dependence of the dielectric properties, electrostrictive strain and thermal…
Abstract A fabric softener, N ‐β‐aminoethyl‐γ‐aminopropyl polydimethyl‐ co ‐polydiphenylsiloxane (PASO), was synthesized by the polymerization of octamethyl cyclotetrasiloxane with an amino‐functional silane and dimethyldiphenylsilane. The chemical structure of the synthesized polysiloxane was characterized by Fourier…
The problem of polyhedral (in)stability for the crystallization of macromolecules is discussed. We present both qualitative and quantitative data on the transition of face morphology in response to surface concentration gradients for the case of glucose isomerase. We show that in the absence of convective currents an…
The new polymeric composites with azobenzene chromophores are synthesized, and the influence of the chromophore concentration on the photoelectrical effect in films of these materials are investigated. The influence of the external electric field on the absorption spectra of azopolymer films are studied. Electro-optic…
Abstract: The Lagrangian analysis method is re‐analysed. It is shown that when a series of particle velocity profiles (or strain profiles) are measured to determine the dynamic stress–strain relation by the Lagrangian analysis, the crux is attributed to how to simultaneously measure both the stress and particle veloci…
The synthesis and characterization of a unique (electro)chemiluminescent monomer based on a terthienyl system, and its corresponding polymer which is the first example of an electro-active chemiluminescent polymer bearing a pyridazine appendage, are described.
This study explores two-dimensional binary sub-wavelength diffractive lenses (BSDLs) for implementing long focal depth and high transverse resolution based on the rigorous electromagnetic theory and the finite-difference time-domain method. Focusing performances, such as the actual focal depth, the ratio between the f…
The origin of the considerable thickness of the 90-degree head-to-tail domain wall in BaTiO 3 is discussed in the framework of the phenomenological Ginzburg-Landau-Devonshire theory. For this purpose, domain wall widths of 90-degree and 180-degree domain walls in BaTiO 3 and PbTiO 3 are compared. It is argued that the…