Materials Literature
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Nanoparticles of Zn–Al complex oxides (see Figure) have been successfully synthesized in large quantities using a simple hydrothermal process without a surfactant. When these nanomaterials with high surface areas are used as the catalyst for selective reduction of NO x , they show high activity, thermal/hydrothermal s…
Oxo-titanium phthalocyanine (TiOPc) derivatives of catechin and hematoxylin (natural ortho-diol type chiral compounds) have been prepared and characterized by spectral and chromatographic techniques. It is demonstrated that the TiOPc unit is an excellent template for chiral recognition through its isolated Q-transitio…
Abstract A mixture of two epoxy resins, tetraglycidyl 4,4′‐diaminodiphenyl methane and bisphenol‐A diglycidylether, cured with 4,4′‐diaminodiphenyl sulfone, was used as matrix material for high‐performance epoxy hybrid nanocomposites containing organophilicly modified synthetic fluorohectorite and compatibilized liqui…
We report the appearance of ultrasharp magnetization steps in PLD-grown films of ${\mathrm{Pr}}_{0.65}({\mathrm{Ca}}_{y}{\mathrm{Sr}}_{1\ensuremath{-}y}{)}_{0.35}{\mathrm{MnO}}_{3}$ (PCSMO) with $0.7<~y<~0.8,$ generalizing the phenomena recently observed in polycrystal and single-crystal specimens of this mixed-…
A model is proposed for the previously reported lower Schottky barrier ${\ensuremath{\Phi}}_{\mathrm{Bh}}$ for hole transport in air than in vacuum at a junction between the metallic electrode and semiconducting carbon nanotube (CNT). We consider the electrostatics in a transition region between the electrode and CNT…
Uniform drumlike microcrystals of YBO 3:Eu 3+ were prepared via a simple hydrothermal method, in the presence of high-concentration ammonium acetate. As the buffer reagent and ligand, acetate ions were found to be responsible for the especially good uniformity and high crystallinity of the products. Moreover, through…
Size and dispersity control of metallic nanoparticles is of fundamental necessity for their useful chemical implementation. A single-step synthesis of Au nanoparticles 4−15 nm in diameter and with low polydispersity is presented. Amine-induced reduction of a Au(I) precursor in the presence of coordinating ligands lead…
Energy transfer in the conjugated polymer poly[2-methoxy-5-(2‘-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) is investigated using femtosecond degenerate pump−probe experiments at 298 and 4 K. The polarization anisotropy decays are of the form exp[−( t ) 1/2 / T pol ], as predicted by theories of energy transfer in…
The highly sensitive nature of surface plasmon resonance (SPR) spectroscopy and surface plasmon field-enhanced fluorescence spectroscopy (SPFS) are governed by the strong surface plasmon resonance-generated evanescent field at the metal/dielectric interface. The greatest evanescent field amplitude at the interface and…
Hexagonal Se nanowires were synthesized using a simple vapor-phase growth with the assistance of the silicon powder as a source material, which turned out to be very important in the growth of the Se nanowires. The morphology, microstructure, and chemical compositions of the nanowires were characterized using various…
The smart use of polymers and their properties can be exploited to give new composite electrode architectures (see Figure) and improved battery performance. A new polymeric binder combination with controlled polymer‐filler (carbon black) interactions is described. Composite electrodes based on this binder and Li 1.1 V…
The growth of well‐aligned Ga 2 O 3 nanowires at low temperature (550 °C) is reported (see Figure). A single‐source precursor of gallium acetylacetonate is employed as the reactant for the growth of the nanowires by a vapor–liquid–solid route. Structural characterization by X‐ray diffraction and transmission electron…
This paper details an experimental investigation of the clamping effect associated with thick-film piezoelectric elements printed on a substrate. The clamping effect reduces the measured piezoelectric coefficient, d 33 , of the film. This reduction is due to the influence of the d 31 component in the film when a defor…
Abstract This review discusses recent developments in the areas of fabrication, certain types of optical characterization, and applications of a selected class of chemically assembled nanomaterials, namely i) gold and silver nanoparticles deposited onto optically transparent glass substrates; ii) thiol‐functionalized…
Cylindrical microdomains in thin films of mixtures of polystyrene‐ block ‐ poly(methyl methacrylate) and poly(methyl methacrylate) (PMMA) homopolymer are oriented normal to the film surface (see Figure). Confining the PMMA homopolymer to the microdomains increases the persistence of microdomain orientation over large…
Variants of fully spin-polarized electronic structures that may be found in ferromagnetic metals, semimetals and semiconductors are reviewed, with examples. A simple classification scheme is presented, with six broad categories. The attribution of a material to a particular category is based on chemical systematics, o…
Weak metal-arene interactions have been investigated in Zn, Cd, Hg, and Ni complexes of meso-tetraaryl m- and p-benziporphyrin (1 and 2) and of the new compound, m-benziporphodimethene (3). Compounds 1-3 incorporate the phenylene moiety into a macrocyclic structure so as to facilitate the interaction between the arene…
We present ab initio density functional calculations that show P (Al) dopant atoms in small hydrogen-terminated Si crystals to be negatively (positively) charged. These signs of the dopant charges are reversed relative to the same dopants in bulk Si. We predict this novel reversal of the dopant charge (and electronic…
This paper presents a large-scale assembly method to deposit discrete multiwalled carbon nanotubes (MWCNTs) across gaps present in an electrode array. A parametric study showed that MWCNTs dispersed in a liquid could be deposited to individually span gaps by combining an alternating current (ac) and a direct current (…
We show that elongated nanowires can be grown on crystal surfaces by allowing large strained two-dimensional islands to desorb by varying the adatom supersaturation or chemical potential. The width of the wires formed in this process is determined by a competition between the repulsive elastic interactions of the long…