Materials Literature
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In this paper we report the successful synthesis of ZnO nanoparticles by a simple solution-combusting method employing a mixture of ethanol and ethyleneglycol (V/V = 60/40) as the solvent, zinc acetate as the zinc source and oxygen gas in the atmosphere as the oxygen source. Powder x-ray diffraction (XRD), transmissio…
Field emission from carbon nanotube bundle arrays grown on self-aligned ZnO nanorods, Li, Chun, Fang, Guojia, Yuan, Longyan, Liu, Nishuang, Ai, Lei, Xiang, Qi, Zhao, Dongshan, Pan, Chunxu, Zhao, Xingzhong
Columnar liquid crystals (LCs) are reported to align spontaneously homeotropically—that is, orthogonally to the surface (see figure and inside cover)—on a glass surface covered with a layer of poly(tetrafluoroethylene) transferred by friction (rubbing). This strategy for producing macroscopic monodomains of homeotropi…
We provide a direct experimental test of the fluctuation-dissipation theorem (FDT) in an aging colloidal glass. The use of combined active and passive microrheology allows us to independently measure both the correlation and response functions in this nonequilibrium situation. Contrary to previous reports, we find no…
It is widely believed that small gold clusters supported on an oxide surface and adsorbed at the site of an oxygen vacancy are negatively charged. It has been suggested that this negative charge helps a gold cluster adsorb oxygen and weakens the O-O bond to make oxidation reactions more efficient. Given the fact that…
First and higher order lattice excitations in the $B$-site disordered perovskites $\mathrm{La}{\mathrm{Fe}}_{1\ensuremath{-}x}{\mathrm{Cr}}_{x}{\mathrm{O}}_{3}$ ($x=0$, 0.1, 0.5, 0.9, and 1) and ${\mathrm{La}}_{0.835}{\mathrm{Sr}}_{0.165}{\mathrm{Fe}}_{0.5}{\mathrm{Cr}}_{0.5}{\mathrm{O}}_{3\ensuremath{-}\ensuremath{\d…
High performance ZnO nanowire field effect transistors (NW-FETs) were fabricated using a nanoscopic self-assembled organic gate insulator and characterized in terms of conventional device performance metrics. To optimize device performance and understand the effects of interface properties, devices were fabricated wit…
The reactions of SO3 with H, O, and OH radicals have been investigated by ab initio calculations. For the SO3 + H reaction (1), the lowest energy pathway involves initial formation of HSO3 and rearrangement to HOSO2, followed by dissociation to OH + SO2. The reaction is fast, with k(1) = 8.4 x 10(9)T(1.22) exp(-13.9 k…
Multibubble sonoluminescence arises from the cavitation of bubbles owing to high-intensity ultrasonic irradiation of liquids. The spectrum of multibubble sonoluminescence in concentrated sulfuric acid sparged with Ar, at relatively low acoustic power, consists of a broad continuum extending into the UV with SO and Ar…
Field-effect transistors based on single nanowires of conducting polymers (i.e., polyaniline and polypyrrole) were fabricated and characterized. The 100-nm-wide and 2.5-μm-long conducting polymer nanowire field-effect transistors were turned “on” and “off” by electrical or chemical signals. A large modulation in the e…
Gold prospecting: Trapped-ion electron diffraction, photoelectron spectroscopy, and density functional theory are used to establish the structure of the free gold cluster ion Au34−. The results suggest a chiral cluster with an internal trigonal pyramid and C3 point symmetry.
This chapter contains sections titled: Introduction and Scope of Review Porphyrin Electrochemistry in the 1960s and Early 1970s Porphyrin Structure and Half-Wave Potentials Metalloporphyrins with Iron Metals Metalloporphyrins with Early Transition Metals Metalloporphyrins with Platinum Metals Metalloporphyrins with Me…
Carbonate and chloride ions mediate an ordered stacking of metal hydroxide slabs to yield ordered layered double hydroxides (LDHs) of Zn with Al, by virtue of their ability to occupy crystallographically well-defined interlayer sites. Other anions such as ClO(4)- (T(d)), BrO(3)- (C(3v)), and NO(3)- (coordination symme…
We report on actuation in high tensile strength yarns of twist-spun multi-wall carbon nanotubes. Actuation in response to voltage ramps and potentiostatic pulses is studied to quantify the dependence of the actuation strain on the applied voltage. Strains of up to 0.5% are obtained in response to applied potentials of…
Using first-principles methods we calculate the absolute deformation potentials ${a}_{v}$ and ${a}_{c}$ of wurtzite ZnO, MgO, CdO, and the band offsets at $\mathrm{Mg}\mathrm{O}∕\mathrm{Zn}\mathrm{O}$ and $\mathrm{Zn}\mathrm{O}∕\mathrm{Cd}\mathrm{O}$ interfaces. We find that the absolute deformation potentials of thes…
High Resolution Image Download MS PowerPoint Slide A set of nearly monodisperse Au−Ag alloy clusters (size range 1.6−2.2 nm) with various Ag content (5−30%) was prepared by the co-reduction method in the presence of poly( N -vinyl-2-pyrrolidone) (PVP). The catalytic activities of the Au−Ag:PVP clusters were investigat…
The modes of vibrations in honeycomb and auxetic structures are studied, with models in which the lattice is represented by a planar network where sites are connected by strings and rigid rods. The auxetic network is obtained modifying a model proposed by Evans et al. in 1991, and used to explain the negative Poisson'…
We study the rheology and distribution of interparticle contact lifetimes for gravity-driven, dense granular flows of non-cohesive particles down an inclined plane using large-scale, three dimensional, granular dynamics simulations. Rather than observing a large number of long-lived contacts as might be expected for d…
Solving the Kohn-Sham eigenvalue problem constitutes the most computationally expensive part in self-consistent density functional theory (DFT) calculations. In a previous paper, we have proposed a nonlinear Chebyshev-filtered subspace iteration method, which avoids computing explicit eigenvectors except at the first…
The structural and electronic properties of (ZnO) n ( n = 2−18) clusters are studied using gradient-corrected density-functional theory (DFT). The starting structures are generated from empirical genetic algorithm simulations or handmade constructions with chemical intuition. The lowest-energy structures of (ZnO) n ar…