Materials Literature
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The organic-terbium hybrid compound designed with the azido molecule L, 2-methoxy benzoic acid tris-(2-methoxybenzoyl)hydrazide, exhibits three-photon-excited green emission as well as second-harmonic generation even though the antenna is unlinked from the metal center.
Cooling hot-spots with high heat flux (e.g., >1000 W/cm2) is becoming one of the most important technical challenge in today's integrated circuit industry. More aggressive thermal solutions, than would be required for uniform heating, are highly desired. Recently, solid state thermoelectric coolers (TECs) have receive…
Multi-walled carbon nanotubes (MWCNTs) with systematically varied diameter distributions and defect densities were reproducibly grown from a modified catalyst structure templated in an amine-terminated fourth-generation poly(amidoamine) (PAMAM) dendrimer by microwave plasma-enhanced chemical vapor deposition. Thermal…
The optical-transport properties of 1D Se-doped CdS nanostructures with different doping contents and/or crystallization degrees are reported. The locally excited photoluminescence shows a significant redshift during the transport along the long axis of the 1D structures and can leave enough PL intensity for detection…
Unsymmetrical shape-persistent macrocycles have been prepared from diphenylacetylene monomers using imine formation and metathesis. A sequence-directed approach, in which each monomer is uniquely labeled by its N-donor/C-donor sequence, has been used to control the self-assembly and makes possible an added level of co…
The reaction of N-(2-hydroxy-5-nitrobenzyl)iminodiethanol (=H3(5-NO2-hbide)) with Mn(OAc)2* 4 H2O in methanol, followed by recrystallization from 1,2-dichloroethane, yielded a wheel-shaped single-molecule magnet (SMM) of [MnII 3MnIII 4(5-NO2-hbide)6].5 C2H4Cl2 (1). In 1, seven manganese ions are linked by six tri-anio…
A single molecular approach has been developed to selectively template polyaniline nanomaterials via interfacial and emulsion polymerization routes to control the nanomaterials shape, size, solubility, solid state ordering, and expanded polymer chain to coil-like conformation. A new amphiphilic azobenzenesulfonic acid…
Electrically tunable solidly mounted thin film bulk acoustic resonators based on BaxSr1-xTiO3films are reported for the first time. The films are acoustically isolated from the silicon substrate by a Bragg reflector stack. Applying DC bias induces piezoelectric effect and an acoustic resonance at approximately 4 GHz.…
Post-annealing studies in different atmospheres combined with high resolution x-ray studies on epitaxial ZnO and Zn1–xCoxO films revealed that the c-axis lattice parameter decreases when interstitial zinc is removed from ZnO. The ‘c' parameter change reverses sign when samples are re-annealed in a Zn-rich atmosphere.…
There is a growing interest in the use of collagen matrices for tissue engineering. To prevent rapid degradation and to improve their mechanical properties, collagen matrices have been modified using different crosslinking agents. Among the different agents used, water soluble carbodiimides (such as N'-(3-dimethylamin…
LiBH 4 that has been ball-milled with different additives and subsequently mixed with mesoporous silica-gel has been investigated using thermal desorption spectroscopy and thermogravimetry. Mixtures of LiBH 4 and mesoporous silica-gel (composition 50:50 wt %) release hydrogen at ∼260 °C. Samples, where LiBH 4 was ball…
Various factors that affect metal-hydride phase stability are investigated from first principles. As a particular example, we consider hydride stability in the Ti-H system, exploring the role of configurational degrees of freedom, zero-point vibrational energy as well as coherency strains. The tetragonal $\ensuremath{…
Catch and release: Multivalent dendrons that have o-nitrobenzyl-linked spermine surface groups bind DNA efficiently by multivalent interactions. Cleavage of the o-nitrobenzyl groups from the dendron framework, with short UV irradiation, results in a rapid release of DNA, which can be attributed to dendron degradation…
Past work has shown that the generalized-stacking-fault surface energy (GSFE) curve, which represents the energy dependency of rigidly shearing an fcc crystal at a (111) plane along a $[\ensuremath{-}1\ensuremath{-}12]$ slip direction, can provide invaluable information on the nature of the dislocation activity in nan…
Liposomal and other nanocarrier based drug delivery vehicles can localize to tumours through passive and/or active targeting. Passively targeted liposomal nanocarriers accumulate in tumours via ‘leaky’ vasculature through the enhanced permeability and retention (EPR) effect. Passive accumulation depends upon the circu…
Nanocrystalline cobalt ferrite particles with the grain size of 8 nm were synthesized by using the co-precipitation technique and subsequently heat treated to obtain larger grain sizes. The effect of grain size, cation distribution, frequency and temperature on their dielectric properties has been studied. The dielect…
Spiders spin a diverse array of silk fibers that are predominately composed of repetitive proteins (spidroins) encoded by a gene family. Characterization of this gene family has focused on spidroins synthesized by the Araneomorphae (true spiders), whereas only a single sequence is known from the Mygalomorphae (tarantu…
Static magnetic susceptibility χ, ac susceptibility χ_{ac} and specific heat C versus temperature T measurements on polycrystalline samples of In2VO5 and χand C versus T measurements on the isostructural, nonmagnetic compound In2TiO5 are reported. A Curie-Wiess fit to the χ(T) data above 175 K for In2VO5 indicates fer…
We have examined whether the Co ions crystallographically substitute on the Ti sites in rutile and anatase Ti_{1-x}$Co$_{x}$O$_{2-delta}$ thin films that exhibit room-temperature ferromagnetism. Intensities of the x-ray Bragg reflection from the films were measured around the $K$-absorption-edge of Co. If the Co ions…
We study the influence of ferromagnetic and antiferromagnetic bond defects on the ground-state energy of antiferromagnetic spin chains. In the absence of translational invariance, the energy spectrum of the full Hamiltonian is obtained numerically, by an iterative modification of the power algorithm. In parallel, appr…