Materials Literature
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Abstract We herewith report the thermal, mechanical (modulus), and dielectric properties of polystyrene (PS)/expanded graphite (EG) nanocomposites fabricated by a simple technique of dispersing EG (up to 2.5 vol %) in PS matrix via solution method followed by hot pressing. The thermal stability and char yield of the n…
A new photochromic diarylethene, 1,2-bis(5′-ethoxy-2′-(2″-pyridyl) thiazolyl) perfluorocyclopentene (1), is synthesized. Nanoparticles are obtained by laser ablation at both 355 and 532 nm, corresponding to the absorption wavelengths of the open and the closed forms. 1 can be reversibly photoswitched in various states…
We have synthesized a quaternary fluoroarsenide SrFeAsF with the ZrCuSiAs-type structure (P4/nmm, a = 0.3999 and c = 0.8973 nm), which is composed of an alternately stacked (FeAs)- and (SrF)+ layers, analogous to the FeAs-based superconductor LaFeAsO. SrFeAsF shows metallic type conduction with the anomaly at ~180 K.…
Uniform Cu(2)S nanodisks have been synthesized from a well-characterized layered copper thiolate precursor by structure-controlling solventless thermolysis at 200-220 degrees C under a N(2) atmosphere. The development from small Cu(2)S nanoparticles (diameter approximately 3 nm) to nanodisks (diameter 8.3 nm) and then…
Abstract Highly‐aligned luminescent electrospun nanofibers were successfully prepared from two binary blends of PFO/PMMA and PF + /PMMA. The PFO/PMMA aligned electrospun fibers showed a core/shell structure but the PF + /PMMA fibers exhibited periodic aggregate domains in the fibers. The aligned fibers had polarized s…
Polyimide/TiO2 nanohybrid films with good corona resistance were prepared by using in situ dispersive polymerization. Effects of the concentration of nano-TiO2 fillers and the corona aging time on the dielectric properties of the films were explored. Results showed that the corona resistance of the hybrid films could…
Abstract In this paper we propose a solution to an unsolved problem in solid state physics, namely, the nature and structure of the glass transition in amorphous materials. The development of dynamic percolating fractal structures near T g is the main element of the Twinkling Fractal Theory (TFT) presented herein and…
Multi-stranded threads are fabricated using AC electrospinning. The threads are 1–100 µm thick and are composed of interconnected ∼100 nm thick nanofiber strands. The ease of collection due to localization of the whipping instability leads to uncomplicated control and placement of the threads. The network structure ha…
Specular X-ray reflectivity data provide detailed information on the electron density distribution at an interface. Typical modeling methods involve choosing a generic electron density distribution based on an initial speculation of the electron density profile from the physical parameters of the experimental system.…
Ordnung ist alles: Goldnanostrukturen wie Nanostäbe, -würfel, -polyeder und -bipyramiden bilden beim Verdampfen von Tröpfchen mit einer oder zwei Komponenten geordnete Aggregate, wobei die Anordnung der Nanostrukturen stark von deren Form und Größe abhängt. Anordnungen von Goldnanostäben lumineszieren bei Zweiphotonen…
Raman spectra of single-walled carbon nanotubes (SWNTs) with diameters of 0.6--1.3 nm have been studied under high pressure. A ``plateau'' in the pressure dependence of the $G$-band frequencies was observed in all experiments, both with and without pressure transmission medium. Near the onset of the $G$-band plateau,…
In this paper a novel one-step synthetic pathway that controls both functionality and morphology of functionalized periodic helical mesostructured silicas by the co-condensation of tetraethoxysilane and hydrophobic organoalkoxysilane using achiral surfactants as templates is reported. In contrast to previous methods,…
Shear-mechanical and dielectric measurements on the two monohydroxy (monoalcohol) molecular glass formers 2-ethyl-1-hexanol and 2-butanol close to the glass-transition temperature are presented. The shear-mechanical data are obtained using the piezoelectric shear-modulus gauge method covering frequencies from 1 mHz to…
ZnO and GaN have a type-II band offset. The incorporation of one compound into the other would lead to a reduced bandgap as compared to that of either ZnO or GaN. Our density-functional theory calculation reveals an asymmetric bandgap reduction in this nonisovalent system; i.e., incorporating GaN in a ZnO host results…
Currently, Y2O3–Al2O3 phase diagrams do not show the technologically significant yttrium aluminum garnet (Y3Al5O12,YAG) phase as deviating from the stoichiometric ratio, i.e., YAG is always expressed as a line compound. In this paper, we not only report the synthesis of nonstoichiometric YAG, but also the use of atomi…
An elliptical invisible cloak is proposed using a coordinate transformation in the elliptical-cylindrical coordinate system, which crushes the cloaked object to a line segment instead of a point. The elliptical cloak is reduced to a nearly circular cloak if the elliptical focus becomes very small. The advantage of the…
We demonstrate for the first time the feasibility of all-diamond integrated optic devices over large areas using a combination of photolithography, reactive ion etching (RIE) and focused ion beam (FIB) techniques. We confirm the viability of this scalable process by demonstrating guidance in a two-moded ridge waveguid…
Abstract The variation of the green strength of natural rubber (NR) with the preparation method of the film was studied to elucidate the origin of the stress–strain behavior characteristics of NR in connection with the structure of branch points in NR. A rubber film prepared via casting from NR latex showed the highes…
We report the design, fabrication, and measurement of a terahertz metamaterial composed of single geometry electric field coupled resonators that has two closely spaced electric resonances near 1.0 and 1.5THz. Due to the mutual coupling between the different resonances in the particle, the lower frequency resonance of…
Oligostilbenoids are polyphenols that are widely distributed in nature with multifaceted biological activities. To achieve biomimetic synthesis of unnatural derivatives, we subjected three resveratrol analogues to oligomerization by means of one-electron oxidants. Upon varying the metal oxidant (AgOAc, CuBr(2), FeCl(3…