Materials Literature
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The PZT material near the morphotropic phase boundary where a monoclinic phase was observed is studied. A theory of the tetragonal to monoclinic phase transition was developed within the Landau free energy approach. The phase transition from the tetragonal to the monoclinic phase is of the first order near the second…
The six different crystals of the versatile clathrate host racemic 1,1‘-binaphthyl-2,2‘-dicarboxylic acid (BNDA) that are obtained from its solution in 1,4-dioxane at varying crystallization temperatures from 15 to 35 °C are reported. They involve four solvates ( 1, 2BNDA/dioxane; 2, BNDA/dioxane; 3, 2BNDA/2dioxane; 4…
Abstract Magnesium borate hydroxide (MgBO2(OH)) nanowhiskers with a diameter of 20–50 nm and a length of 0.5–3 μm were synthesized via a facile hydrothermal route, using MgCl2·6H2O, H3BO3, and NaOH as the reactants. Mg7B4O13·7H2O with poor crystallinity was formed after coprecipitation of the reactant solutions at roo…
We have successfully fabricated various BaWO 4 hollow structures, including spheres, peanuts, and ellipsoids, by a precipitation reaction between BaCl 2 and Na 2 WO 4 solutions in the presence of poly(methacrylic acid) (PMAA). The size and shape of the BaWO 4 products could be modified by using different concentration…
A cross-linked polymer, prepared by the in situ polymerization of a thermotropic columnar liquid crystal, was found to work as a host with a flexible framework, which was reminiscent of intercalation hosts, such as clays, graphites, and coordination polymers. The structural order of the cross-linked polymer was revers…
In recent works, the author has shown the utility of new, semiempirical kinetic model equations for treating dispersive chemical processes ranging from slow (minute/hour time scale) solid-state phase transformations to ultrafast (femtosecond) reactions in the gas phase. These two fundamental models (one for homogeneou…
This work uses density functional calculations to design a new high-valent Fe(V)=O catalyst [Mo5O18Fe=O]3-, which is based on the Lindqvist polyoxometalate (Mo6O19(2-)). Because the parent species is stable to oxidative conditions, one may assume that the newly proposed iron-oxo species will be stable, too. The calcul…
The in-situ polymerization of aniline in the presence of multiwalled carbon nanotubes and ( S )-(+)-10-camphorsulfonic acid provides a route to optically active composite materials. Their chiroptical properties suggest that polymers and composite materials adopt similar optical properties indicative of “compact coil”…
The benzene-Ru(II)-supported dilacunary decatungstosilicate [{Ru(C6H6)(H2O)}{Ru(C6H6)}(gamma-SiW10O36)]4- and the isostructural decatungstogermanate [{Ru(C6H6)(H2O)}{Ru(C6H6)}(gamma-GeW10O36)]4- have been synthesized and characterized by multinuclear solution NMR, IR, elemental analysis, and electrochemistry. Single-c…
A simple method of controlling the wettability of colloidal crystal films from superhydrophobicity to superhydrophilicity is presented by adjusting the pH of the assembly system under ambient conditions. The different wettabilities are attributed to the presence or absence of hydrogen bonding between sodium dodecylbez…
The decomposition of lithium amide (LiNH2) to lithium imide (Li2NH) and ammonia (NH3) with and without high-energy ball milling is investigated to lay a foundation for identifying methods to enhance the hydrogen uptake/release of the lithium amide and lithium hydride mixture. A wide range of analytical instruments are…
Porous carbons have received much attention recently for potential applications in energy generation and storage, molecular sieving, and environmental remediation. Property optimization for specific applications rests largely on controlling the volume, size, and shape of the pores at the synthetic level. Direct atom-s…
A detailed study of the role of solution pH and ionic strength on the swelling behavior of capsules composed of the weak polyelectrolytes poly(4-vinylpyridine) (P4VP) and poly(methacrylic acid) (PMA) with different numbers of layers was carried out. The polyelectrolyte layers were assembled onto silicon oxide particle…
The synthesis and magnetic properties of Ni nanoparticles containing <150 atoms are described. These materials are prepared in an organic solvent using hydrophobic dendrimers as templates, which results in a high degree of size monodispersity. The dendrimer-encapsulated nanoparticles were characterized by UV−vis spect…
Metallic nanostructures were prepared through the alternate immersion of derivatized glass slides in solutions of gold nanoparticles (NPs) and a propanedithiol linker molecule. Nanostructures consisting of 1-17 depositions of gold NPs were synthesized, and these substrates were characterized using UV-vis spectroscopy…
In this paper we show that through electrical characterization and detailed quantum simulations of the capacitance-voltage and current-voltage characteristics it is possible to extract a series of material parameters of alternative gate dielectrics. We have focused on HfO2 and HfSiXOYNZ gate stacks and have extracted…
We report the magnetic, magnetocaloric and magnetoresistance results obtained in Tb(Ni1-xFex)2 compounds with x=0, 0.025 and 0.05. Fe substitution leads to an increase in the ordering temperature from 36 K for x=0 to 124 K for x=0.05. Contrary to a single sharp MCE peak seen in TbNi2, the MCE peaks of the Fe substitut…
By virtue of the itinerant electron metamagnetism (IEM), the RCo2 compounds with R=Er, Ho and Dy are found to show first order magnetic transition at their ordering temperatures. The inherent instability of Co sublattice magnetism is responsible for the occurrence of IEM, which leads to interesting magnetic and relate…
A series of tetradentate amine(bisphenolate) ligands have been synthesized and complexed to Ti(IV), Zr(IV), and Hf(IV) centers. Two distinct ligand sets have been synthesized both exhibiting ONNO coordination. The steric bulk of the ligands was varied to assess the impact of sterics on the catalytic performance in the…
On the basis of evidence from 31P NMR spectroscopy, and using PbSe as a model, we propose two simultaneous mechanisms through which "monomers" are formed in preparations of lead chalcogenide nanocrystals (NCs). In one mechanism, selenium is delivered as a Se2- species, whereas in the other, Se0 reacts with metal alrea…