Materials Literature
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Composite semiconductors provide routes for realizing high-performance electronic devices, but for many applications of such devices, low-cost manufacturing techniques are desirable. We have engineered a 3 orders of magnitude enhancement of the ultraviolet photoresponse of ZnO thin films, fabricated “in situ” by drop-…
This contribution reports the first examples of stereoregular (isotactic, it -, and syndiotactic, st -) methacrylate-POSS (polyhedral oligomeric silsesquioxane) hybrid polymers and their derived nanostructured assemblies. The polymerization of methyl methacrylate (MMA) by isospecific and syndiospecific living metalloc…
Two- and four-probe electrical measurements on individual conjugated polymer nanowires with different diameters ranging from 20 to 190 nm have been performed to study their conductivity and nanocontact resistance. The two-probe results reveal that all the measured polymer nanowires with different diameters are semicon…
ABSTRACT In this study, bacterial cellulose (BC) which has high water‐absorption‐ability was added to dolphin‐fish (mahi‐mahi) surimi to assess the characteristics of composites gels. Twelve days of Gluconacetobacter xylinum (BCRC12335) fermentation decreased the pH of this medium from 4.0 to 3.6, with nata growth on…
We investigated the formation mechanism of a faceted crystal-melt interface by in situ observation. It was directly proved that a wavy perturbation is introduced into a planar crystal-melt interface and the perturbation results in zigzag facets. Such a facet formation process was observed when growth velocity was high…
The magnetic structures which endow TbMnO(3) with its multiferroic properties have been reassessed on the basis of a comprehensive soft x-ray resonant scattering (XRS) study. The selectivity of XRS facilitated separation of the various contributions (Mn L(2) edge, Mn 3d moments; Tb M(4) edge, Tb 4f moments), while its…
Die H2-D2-Austauschgeschwindigkeit an Goldpartikeln auf TiO2 verhält sich proportional zum Kehrwert des Quadrats des durchschnittlichen Durchmessers (siehe Bild). Folglich dissoziert Wasserstoff an der Grenzfläche zwischen Gold und TiO2, und die Aktivität für die katalytische H2-Dissoziation wird weder durch ein geänd…
Abstract We have attempted to prepare graphene samples by mechanical exfoliation of HOPG (highly oriented pyrolytic graphite) using scotch tape. Random testing of the flakes by AFM has shown in majority single layer graphene. Nevertheless, the presence of ultrathine graphite cannot be excluded in the large assembly of…
We study thermal transport in anisotropic Heisenberg spin chains using the quantum master equation. It is found that thermal rectification changes sign when the external homogeneous magnetic field is varied. This reversal also occurs when the magnetic field becomes inhomogeneous. Moreover, we can tune the reversal of…
Two-dimensional (2D)-hexagonal (plane group, p 6 mm ) mesoporous polymer resin thin films were obtained through evaporation-induced organic-organic self-assembly of a preformed oligomeric resol precursor and the triblock copolymer template pluronic P123. The polymer resin films were prepared on silicon wafers by spin-…
Abstract A novel toughened cyanate ester (CE) resin with good dielectric properties and thermal stability was developed by copolymerizing 2,2′‐bis(4‐cyanatophenyl)iso‐propylidene (BCE) with a combined modifier (HBPSiEP) made up of hyperbranched polysiloxane (HBPSi) and epoxy (EP) resin. HBPSi was synthesized through t…
Water-solublel-arginine-capped Fe3O4 nanoparticles were synthesized using a one-pot and green method. Nontoxic, renewable and inexpensive reagents including FeCl3,l-arginine, glycerol and water were chosen as raw materials. Fe3O4 nanoparticles show different dispersive states in acidic and alkaline solutions for the t…
The single crystal structure of a micrometre-scale copper hexadecafluoro-phthalocyanine (F(16)CuPc) ribbon synthesized by vaporization-condensation-recrystallization (VCR) process was resolved by using a synchrotron X-ray diffractometer.
Blends of two metal-free phthalocyanine mesogens exhibiting different mesophases (Col r phase from room temperature to isotropization for the first one, and Col r at room temperature then Col h from around 60 °C to isotropization for the second one) have been studied in order to determine the relationship between the…
Introduction of oxygen vacancies in α-Al 2 O 3 has been quite challenging because of its high thermal stability and high melting temperature. Here, we present a method to introduce oxygen vacancies in α-Al 2 O 3 . The method is based on vacuum heating of a polycrystalline α-Al 2 O 3 powder, producing a sphere-shaped s…
A simple method for fabricating environmentally stable superhydrophilic wool fabrics is reported here. An ultrathin silica layer coated on the wool altered both the surface roughness and the surface energy of the fiber and endowed the wool fabrics with excellent water absorption. The process of coating silica sols was…
Abstract Castor oil–polyurethane elastomers were prepared by reacting poly (1,4‐butane diol) (Terathane 1400) with aliphatic 1,6‐hexamethylene diisocyanate. The prepolymers were chain‐extended with bifunctional precursor chains and/or with castor oil as a trifunctional crosslinker at stoichiometric ratios. These resul…
The use of SiO(2) as a catalyst for graphitic nanostructures, such as carbon nanotubes and graphene, is a new and rapidly developing catalyst system. A key question is whether carbide phases form in the reaction. We show the formation of SiC from SiO(2) nanoparticles for the synthesis of graphitic carbon nanostructure…
In this study, a synthesis route was developed for preparing highly transparent novel polyimide-nanocrystalline-titania hybrid optical films with a relatively high titania content (up to 50 wt%) and thickness (20–30 μm) from a soluble polyimide 6F-poly(p-hydroxy-imide) (6FPI). It has been demonstrated that the introdu…
The properties of interstitial and substitutional Li in wurtzite ZnO are modeled using hybrid density functional calculations. We investigate the impact of the band-gap error on the formation energies of the two defects and their dependence on the Fermi level. It is found that within a local-density approximation, the…