Materials Literature
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The behavior of hydrogen in $p$-type ${\mathrm{Cu}}_{2}\mathrm{O}$ has been reported to be quite unusual. Muon experiments have been unable to ascertain the preferential hydrogen site within the ${\mathrm{Cu}}_{2}\mathrm{O}$ lattice, and indicate that hydrogen causes an electrically active level near the middle of the…
We have synthesized Yb2+-activated Si6−zAlzOzN8−z (0.05z2.3, 0.03 mol% Yb2+0.7 mol%) green phosphors by solid-state reaction at 1900 °C for 2 h under a nitrogen pressure of 1.0 MPa. Phase purity, photoluminescence and its thermal quenching were investigated. A single phase was obtained for all values of z and Yb2+…
The sinterability of high‐purity, nanocrystalline Y 2 O 3 without any additives was investigated by spark plasma sintering (SPS) for a combination of low sintering temperatures (850°–1050°C) and low heating rates (2–50°C/min). At a sintering temperature of 950°C and a heating rate of 2°C/min, the SPS yielded a polycry…
Diarylethene derivatives are known to be photochromic, that is, upon irradiation they change their color because of ultrafast photocyclization. Their proposed use as nonvolatile data storage materials requires the cycloreversion process to be very slow in the dark. We apply density functional theory (DFT) methods to p…
Abstract Microcellular biodegradable polymer foam with an open porous structure was prepared from amorphous poly‐ L,D ‐lactic acid (P L , D LA) blended with polystyrene (PS), or polymethyl methacrylate (PMMA). The blends were prepared by polymerizing either styrene or methyl methacrylate (MMA) in a P L , D LA matrix.…
Summary In this study, antimicrobial activity of zein films incorporated with partially purified lysozyme and disodium ethylenediaminetetraacetic acid (Na 2 EDTA) has been tested on selected pathogenic bacteria and refrigerated ground beef patties. The developed films containing 700 μg cm −2 lysozyme and 300 μg cm −2…
We investigate the optical properties of a true three-dimensional metamaterial that was fabricated using a self-assembly bottom-up technology. The metamaterial consists of closely packed spherical clusters being formed by a large number of non-touching gold nanoparticles. After presenting experimental results, we appl…
PREFACE. LIST OF SYMBOLS. Introduction to Polymer Materials. PART I. 1 The Four Classes of Polymer Materials. 2 The Macromolecular Chain in the Amorphous Bulk Polymer: Static and Dynamic Properties. 3 The Glass Transition. 4 Secondary Relaxations in Amorphous Polymers. 5 Entanglements in Bulk Un-Cross-Linked Polymers.…
The sheet plasmon of graphene on Ir(111) was investigated in this paper by means of high-resolution electron energy loss spectroscopy. The perfect lateral coordination of sp 2 -hybridized C atoms on a large scale is manifested by brilliant moiré diffraction images. However, the modulation of the graphene films caused…
This letter presents a detailed study of transport in graphene field-effect transistors (GFETs) with various channel lengths, from 5 μm down to 90 nm, using transferred graphene grown by chemical vapor deposition. An electron-hole asymmetry observed in short-channel devices suggests a strong impact from graphene/metal…
Dynamic supramolecular assembly: Solvent polarity plays a critical role in hydrogen-bonding-mediated assembly of bis(amide)-functionalized naphthalenediimide acceptor and dialkoxynaphthalene donor chromophores. In tetrachloroethylene, a stable, charge-transfer (CT) gel was achieved, whereas in methylcyclohexane a CT s…
The structure of emeraldine salt and emeraldine bases with different molar weight and their behavior in electrochemical doping was studied by different spectroscopic and spectroelectrochemical techniques. By Fourier transform infrared (FTIR) spectroscopy, the branching of the polymer chain at tri- and tetrasubstituted…
Abstract Multiwalled carbon nanotubes (MWCNTs) were homogeneously dispersed in a pure polyurethane resin by grinding in a planetary ball mill. The structure and surface morphology of the MWCNTs and MWCNT/polyurethane composites were studied by filed emission scanning electron microscopy (FESEM) and transmission electr…
We highlight the impact of surfactants, routinely used in the fabrication of graphene, which can significantly influence the performance of supercapacitors. Through the utilisation of various graphitic forms we offer insight into the design and fabrication of graphene based supercapacitors.
The in vitro antibacterial activity and mechanism of action of two kinds of acid-soluble chitosan and one water-soluble chitosan against apricot fruit rot pathogen Burkholderia seminalis was examined in this study. Results showed that water-soluble chitosan displayed limited antibacterial activity at four tested conce…
Mesoporous carbons were impregnated with the anionic and cationic surfactants to increase adsorbing capacity for heavy metal ions. Prepared samples were characterized by X-ray diffraction (XRD) and nitrogen adsorption–desorption isotherms. Batch adsorption studies were carried out to study the effect of various parame…
This paper reports the fast growth synthesis of silver (Ag) dendrite crystals on a copper (Cu) substrate assisted by sulfate (SO 4 2– ) ions based on a electroless galvanic displacement reaction between solid Cu and Ag(I) ion. The growth of Ag dendrites is succeeded by using an aqueous solution of Ag + ion and a Cu fo…
In the present work, hydrogen adsorption on the Ga 2 O 3 surfaces was investigated using Fourier transform infrared spectroscopy (FTIR) measurements and periodic density functional theory (DFT) calculations. Both the FTIR and DFT studies suggest that H 2 dissociates on the Ga 2 O 3 surfaces, producing OH and GaH speci…
Casimir-Lifshitz interaction emerging from relative movement of layers in stratified dielectric media (e.g., non-uniformly moving fluids) is considered. It is shown that such movement may result in a repulsive Casimir-Lifshitz force exerted on the layers, with the simplest possible structure consisting of three adjace…
We demonstrate a novel in situ polymerization technique to develop localized polymer coatings on the surface of dispersed pristine graphene sheets. Graphene sheets show great promise as strong, conductive fillers in polymer nanocomposites; however, difficulties in dispersion quality and interfacial strength between fi…