Materials Literature
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A recently installed research-scale metal–organic chemical vapor deposition (MOCVD) system at Oak Ridge National Laboratory, provided by SuperPower, Inc., has been used to investigate processing variables for MOCVD YBCO precursors and trends in the resulting properties. Systematic studies of YBCO film growth on LaMnO…
Purpose This paper aims to describe two manufacturing techniques for selective patterning of Poly‐3‐4‐ethyleneoxythiophene/poly‐4‐sytrensulfonate (PEDOT/PSS) for flexible electronic applications. The paper also includes methods to tailor the electrical conductivity of the patterned polymeric films. Design/methodology/…
Using numerical and analytical calculations we study the structure of vacancies and interstitials in two-dimensional colloidal crystals. In particular, we compare the displacement fields of the defect obtained numerically with the predictions of continuum elasticity theory for a simple defect model. In such a comparis…
We obtain a bound-state spectrum of low-energy excitations near the Fermi points of gapped graphene in the presence of a charge impurity. The effects of possible short-range interactions induced by the impurity are modeled by suitable boundary conditions. The spectrum in the subcritical region of the effective Coulomb…
Abstract The performances of the novel intumescent flame retardant (IFR) polypropylene (PP) composites containing melamine phosphate (MP) and tris(1‐oxo‐2,6,7‐trioxa‐1‐phosphabicyclo[2,2,2]methylene‐4)phosphate (TPMP) were investigated. The flame retardancy of IFR‐PP system was characterized by limiting oxygen index (…
A novel bioconjugate of stearic acid capped maghemite nanoparticle (gamma-Fe(2)O(3)) with bovine serum albumin (BSA) was developed by taking recourse to the fatty acid binding property of the protein. From FT-IR study, it was found that conjugation took place covalently between the amine group of protein molecule and…
Verzweigt: Steife, aromatische Dendrimere aus 5 bzw. 17 Pyreneinheiten wurden synthetisiert, charakterisiert und mit zwei Modellverbindungen verglichen. Die starre und stark verdrillte Struktur ermöglicht eine genaue räumliche Anordnung, bei der jede Einheit ein Chromophor ist. Hohe Extinktionskoeffizienten und Fluore…
Hexafluoroisopropanol functionalized polythiophene is able to build up an isotropic self-supporting network structure. The gel network can be melted and then transformed via mechanical shearing to form an anisotropic gel with the chains highly aligned along the shearing direction and the conjugated backbones π-stacked…
Mixed-valence vanadium oxide nanotubes (VO x −NTs) were synthesized by a new route starting from the oxidation of a vanadyl (IV) acetate precursor. The formation of a layered structure- which is necessary for eventually obtaining nanotubes was confirmed. The partial oxidation of this layered composite by hydrothermal…
The interaction of emeraldine base (PANI-EB) with silver and gold colloids was probed by using Surface-Enhanced Resonance Raman Scattering (SERRS) at 3 different exciting radiations. Due to the great sensitivity of SERRS technique the detection limit of PANI-EB concentration was ca. 2 x 10(-7) mol L(-1) in Ag and Au c…
Abstract This paper describes the isolation of four layered double hydroxide (LDH) compounds having the general formula[Ni II 3– x Cr III x (OH) 6 ](CO 3 ) x /2 · y H 2 O [ x = 0.57 ( 1 ), 0.69 ( 2 ), 0.81 ( 3 ) and 0.93 ( 4 )] by using homogeneous precipitation methods and varying the metal ratio in the synthetic sol…
Insulated polyaniline (PANI) polyrotaxane molecular wires were synthesized to apply them as advanced materials in photovoltaic devices and light emitting diodes. Benzylamine-substituted polyaniline is constructed through the synthesis and deprotection of tert-butoxycarbonyl (Boc) protected PANI using Pd-catalyzed poly…
The present work is a systematic numerical study of the thermal properties of single-walled carbon nanotubes (SWNTs) in suspensions. A computational model, based on the simulation of the random movement of Brownian thermal walkers in aqueous and in oil suspensions of SWNTs, was used to investigate the effect of the SW…
A series of isostructural M(mu-OH(2))(2)[Au(CN)(2)](2) (M = Co, Fe, and Mn) coordination polymers was synthesized from the reaction of M(II) with [(n)Bu(4)N][Au(CN)(2)]. The basic structural motif for these polymers is analogous to that of previously reported Cu(II)- and Ni(II)-containing polymers and contains repeati…
In this work, the synthesis of porous TiN/carbon composites via “reactive hard templating” is presented. The concept of this synthesis strategy is to use the template, responsible for the final morphology of the TiN/carbon material, as a reactant and nitrogen source; template removal is unnecessary as the final produc…
Multicolor fluorescent containers: A silica coating procedure has been devised for the preparation of multifluorescent dye-loaded zeolite L crystals with luminescent anisotropic cores and isotropic shells. The method comprises a combination of the polyelectrolyte layer-by-layer technique and Stöber synthesis (see sche…
The orthophosphate phosphors, Ba3La(PO4)3 activated with Dy3+ and Gd3+-Dy3+ ions, were prepared by a solid reaction technique at high temperature. Their spectroscopic properties were investigated in the vacuum ultraviolet (VUV)-visible range. We found that the introducing of Gd3+ greatly enhances the Dy3+ luminescence…
In the present paper, we report a simple approach for creating a nanocrystalline layer on the surface of stone wool fibers (SWFs) with a basalt‐like composition. The approach is based on a preoxidation process of the SWFs in atmospheric air at a temperature around the glass transition temperature ( T g ) for various d…
YNbO 4 and YNbO 4:RE (RE = Er 3+, Sm 3+, Tb 3+, and Tm 3+ ) nanophosphors have been prepared using a citrate-gel combustion procedure. The results of X-ray diffraction reveal that the YNbO 4 samples crystallized in both monoclinic and tetragonal phases in the investigated temperature range. The excitation spectra of t…
The purpose of this study was to compare the frictional properties of four self-ligating metal brackets, Speed, Damon 2, In-Ovation, and Time, with those of three conventionally ligated metal brackets, Time, Victory Twin, and Discovery. The self-ligating Time bracket can also be used as a conventionally ligated bracke…