Materials Literature
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Sensitive “hot spot”: Upon exposure to polar organic vapors like acetone and ammonia, a large peak shift is observed for the NC stretching band of 1,4-PDI that is situated in the gap between a gold electrode and gold nanoparticles (see figure). The peak shift is due to the large surface-to-volume ratio of Au nanoparti…
One-step colloidal synthesis of subnanometer CdS clusters in hydrophobic MFI-type zeolite crystals in the presence of 3-mercaptopropyl-trimethoxysilane (MPS), cadmium precursor, and tetrapropylammonium hydroxide (TPAOH) is performed. MPS is used as the bifunctional agent, as it hydrolyzes fast, cross-links with the si…
Several molecule-based magnets can be constructed from diruthenium tetracarboxylate building blocks. We study two such materials with antiferromagnetic interactions between Cr(III) ions and diruthenium paddle-wheel complexes. While collinear magnetic ordering in the three-dimensional compound is frustrated by the easy…
Lead‐based ferroelectric (FE) ceramics exhibit superior electromechanical properties; therefore, there has been an increased focus on developing new lead‐based FE materials with high Curie temperature ( T c ) and enhanced properties. The aim of this study was to investigate new compositions in the Pb(Mg 1/3 Nb 2/3 )O…
This paper starts with an introduction to the Onsager principle of minimum energy dissipation which governs the optimal paths of deviation and restoration to equilibrium. Then there is a review of the variational approach to moving contact line hydrodynamics. To demonstrate the validity of our continuum hydrodynamic m…
This work provides a generalization of Evans' homogeneous nonequilibrium method for estimating thermal conductivity to molecular systems that are described by general multibody potentials. A perturbed form of the usual Nose-Hoover equations of motion is formally constructed and is shown to satisfy the requirements of…
0.60Ba 0.6 Sr 0.4 TiO 3 (BST)–(0.40− x )Mg 2 SiO 4 (MS)– x Al 2 O 3 ( x =0, 0.5, 3, 5wt%) composite ceramics exhibit excellent characteristics suitable for tunable device applications. With increasing amount of Al, the dielectric peak can be quantitatively broadened and suppressed; the “phase transition temperature” T…
The morphology and defects in diamond grains comprising Brazilian carbonado have been investigated using X-ray diffraction, photo- and X-ray luminescence, electron paramagnetic resonance and Raman spectroscopy. Paramagnetic and non-paramagnetic defects in the diamond structure indicate that many of the studied carbona…
Abstract A novel trinuclear nickel(II) complex with N,N,N′,N″,N″‐pentamethyldiethylenetriamine (pmdien) and a trithiocyanurate(3–) (ttc3–) bridge of composition [Ni3(pmdien)3(μ‐ttc)](ClO4)3 (1) was prepared. The X‐ray crystal structure of 1 was determined, revealing the tris‐N,S chelating mode of the trithiocyanurate…
This article presents ultrasound assisted carbonization method for the synthesis of calcium carbonate nanoparticles (nano calcite). The effect of different surfactants, such as polyacrylic acid, steric acid, sodium tripolyphosphate and myristic acid, on the synthesis of nano CaCO3 was investigated. Concentration of su…
Cuprous halides are among the most studied inorganic materials for excitonic related linear/non-linear optical processes due to their large excitonic binding energies (∼190 and 108 meV for CuCl and CuBr, respectively). In recent years, we have studied CuCl thin films deposited by vacuum evaporation and sputtering tech…
The synthesis, crystal structure, and physical characterization of two new radical salts formed by the organic donors bis(ethylenedithio)tetrathiafulvalene (ET) and bis(ethylenediseleno)tetrathiafulvalene (BETS) and the Keggin polyoxometalate (POM) [SMo(12)O(40)](n-) are reported. The salts isolated are ET(8)[SMo(12)O…
A new diblock copolymer-derived porous reaction layer for microelectrode arrays has been tested for its stability and its compatibility with both site-selective synthesis and electrochemical signaling experiments. The diblock copolymer consisted of a cinnamoyl-substituted polymethacrylate block for attachment to the s…
We present three new crystal structures of members from the photochromic spiropyran family, including a rare example of an open (merocyanine) form. The molecular structures are systematically compared with existing crystallographically relevant data, and a new avenue for stabilizing open spiropyran forms in the solid-…
Highly ordered BiFeO 3 (BFO) nanotubes with about 200 nm in diameter and 60 μm in length are fabricated by a sol-gel AAO template method. A perovskite-type structure of BFO is confirmed in the nanotubes by transmission electron microscopy and selected area electron diffraction analysis. The coexistence of ferroelectri…
Polycrystalline clathrate samples of nominal K(8)Ga(x)Sn(46-x) were prepared by the spark plasma sintering method to investigate their crystal structures, mobilities and thermoelectric properties. The samples almost had a single-phase type-I clathrate structure, and their relative densities reached as high as 98%. The…
The aim of this work is to give an estimate of the magnitude of the error caused by the neglect of the interference effect and inaccurate consideration of elastic scattering in the case of reflection electron energy loss spectra. Different theoretical approaches to describe electron energy loss processes, as well as t…
In this work, a combined process, called centrifugal gel casting (CGC), was proposed for the fabrication of homogenous and reliable monolithic and composite ceramics starting from submicrometer‐sized powders. This method exploits the advantages of both conventional gel casting (GC) and centrifugal slip casting (CSC),…
Abstract In this study, we have introduced electrospinning of a colloidal solution rather than the conventional sol–gel process as a novel strategy to produce silver nanofibres. Typically, a silver acetate/polyvinyl alcohol colloidal solution was successfully electrospun. Electrophoretic light scattering (ELS) and dyn…
Abstract A new stilbene‐tethered bis(porphyrin) tweezer 5 has been synthesized through a Sonogashira cross‐coupling reaction. The tweezer exists as two configurational isomers [(Z) + (E)], which have distinct cavity sizes. Fullerene‐binding studies show that the (Z) isomer of the tweezer has a significantly higher aff…