Materials Literature
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Transparent and flexible thin film transistors (TFTs) with channel layers composed of sintered HgTe nanocrystals were fabricated on top of UV/ozone treated plastic substrates and their electrical properties were characterized. A representative TFT with a channel layer composed of sintered HgTe nanocrystals revealed ty…
Boron nitride nanotubes (BNNTs) were found to induce a new phase in ionic liquids and form gels. The new phases indicate ordering of the ionic liquids' molecules on the surface of BNNTs. An elastic network exists within the gels, which is suggested to originate from a pseudo- X -linked solid structure consisting of BN…
Chalcogenide coatings are investigated to obtain either optical components for spectral applications or optochemical sensors in the mid-infrared. The deposition of Ge(15)Sb(20)S(65) and Te(20)As(30)Se(50) chalcogenide glasses is performed by two physical techniques: electron-beam and pulsed-laser deposition. The quali…
By utilizing the X-ray absorption approach, the gold ions evolving from the Au−Cl complex to Au rods have been elucidated. The theoretical simulation of X-ray absorption spectra further revealed the evolution of gold and concluded that ultrafine small clusters of gold (Au 13 ) formed after a reducing agent was added t…
In this work, a spectrally selective optical element is introduced based on a 2-D guided mode resonance filter (GMRF) as an external feedback element. The GMRF was designed to provide a highly efficient narrow linewidth reflection within the gain bandwidth of the fiber laser, while transmitting the pump beam. These fe…
The liquid-crystalline rare-earth complexes of the type [Ln(LH)3(DOS)3]-where Ln is Tb, Dy, Ho, Er, Tm, or Yb; LH is the Schiff base N-octadecyl-4-tetradecyloxysalicylaldimine; and DOS is dodecylsulfate-exhibit a smectic A phase. Because of the presence of rare-earth ions with a large magnetic anisotropy, the smectic…
We present the behavior of depletion-induced gels for vesicle-polymer mixtures when the ratio of the polymer radius of gyration to the mean vesicle radius is 0.09 and 0.27. As the polymer concentration increases, density gradients build up and an interface is developed between a highly turbid vesicle-rich phase and a…
Published data concerning the problem of the physical aging of glassy polymers are surveyed. Basic attention is given to an analysis of structural rearrangements that accompany the physical aging of glassy polymers. The processes of aging (spontaneous change in the properties of polymer glasses during the storage at a…
A one-step sintering process is developed to prepare nanostructured super-hard B6O?B4C compacts (see figure) from a mixture of B, B2O3, and B4C precursors at a mild pressure of ∼3GPa and high temperatures ranging from 1500–1900 K. The sintered B6O–B4C compacts exhibit hardness values comparable to commercially availab…
We deal with optimal two-material antireflection (AR) coatings for the visible and adjacent spectral regions. It has been shown before that, for a given set of input parameters (refractive indices of the substrate, ambient medium and high- and low-index coating materials, and for a given spectral width of the AR coati…
Multi-walled carbon nanotubes (MWNTs) grafted with sodium polystyrenesulfonate (NaPSS) were deposited on an interdigitated gold electrode decorated with a layer of positively charged poly(diallyldimethylammonium chloride) by a self-assembly method. Then polyaniline (PANI) was in situ polymerized on the surface of the…
A comparison is made between the structural, spectroscopic, electrochemical, and magnetic properties of pyrazolate versus carboxylate complexes [Fe3(mu3(mu3O)(mu-LL)6Cl3]2- containing the Fe3(mu3-O)-motif. While the Fe3(mu3-O)-cores are structurally indistinguishable in the two types of complexes, their magnetic prope…
Electrospun nanofibers based on copolyimides were made, aiming at finding a promising method for improving the mechanical properties of electrospun polyimide nanofibers. The copolyimide had a backbone consisting of 3,3',4,4'-biphenyl-tetracarboxylic dianhydride (BPDA), biphenylamide (BPA) and 4,4'-oxydianiline (ODA) r…
The geometric and electronic structures of dichlorocarbene (CCl(2)) functionalized BN nanotubes (BNNTs) were studied using density functional theory within the generalized gradient approximation. We found that the CCl(2) addition favors slanted B-N bonds in zigzag tubes, and the CCl(2)-attached BNNTs prefer open rathe…
We analyze the full transport statistics of graphene with smooth disorder at low dopings. First, we consider the case of one-dimensional (1D) disorder for which the transmission probability distribution is given analytically in terms of the graphene-specific mean free path. All current cumulants are shown to scale wit…
Spiders spin a functionally diverse array of silk fibers, each composed of one or more unique proteins. Most of these proteins, in turn, are encoded by members of a single gene family thought to have arisen through duplication and divergence of an ancestral silk gene. Because of its remarkable mechanical properties, o…
Highly luminescent CdS-core ZnS-shell nanorods stabilized by mercaptopropionic acid in water were synthesized wet-chemically and characterized by measuring photoluminescence spectra and kinetic profiles as well as absorption spectra, diffraction patterns, and electron microscope images. Photoluminescence from CdS nano…
A series of new monomers of 2,5-bis[(4-tertbutyl-phenyl)-1,3,4-oxadiazole] styrene (M-Ct) and 2,5-bis[(4-alkoxy-phenyl)-1,3,4-oxadiazole]styrene (M−OC m, m is the number of the carbons in the alkoxy groups, m = 8, 10, 12, 14) were synthesized. Conventional radical polymerization of the monomers resulted in a series of…
Using a surface forces apparatus, we have investigated the adhesive and lubrication forces of mica surfaces separated by a molecularly thin, subnanometer film of a high-molecular-weight (2.3 MDa) anionic polysaccharide from the algae Porphyridium sp. adsorbed from aqueous solution. The adhesion and friction forces of…
Investigations on optical and dielectric properties of hybrid ultrathin layer-by-layer (LbL) films of gold nanoparticles (AuNPs) and polyelectrolytes under different pH conditions resulted in surface plasmon resonance (SPR) signal enhancement under attenuated total reflection (ATR) spectroscopy conditions. Theoretical…