Materials Literature
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By coupling the features of anthracene and urea, a new low-molecular-weight gelator (LMWG, 1) with anthracene and urea moieties was designed and synthesized. A nontransparent gel of LMWG 1 in 1,2-dichloroethane was formed and characterized. Of particular interest is the observation of significant fluorescence enhancem…
Insulator-to-metal phase transition (PT) was produced by femtosecond light radiation in $\mathrm{V}{\mathrm{O}}_{2}$ thin films deposited on substrates with different thermal conductivities. Optical pump-probe techniques were applied to study the PT dynamics on a ${10}^{\ensuremath{-}11}--{10}^{\ensuremath{-}9}\phanto…
Abstract The degradation of polymers under ultraviolet (UV) irradiation has been a great concern for biomaterial and agricultural applications. The major objective of this research was to study the effect of UV irradiation on the representative bulk and surface properties of poly ( L ‐lactide) (PLA) films. Two UV sour…
Long coherence lifetimes of electron spins transported using moving potential dots are shown to result from the mesoscopic confinement of the spin vector. The confinement dimensions required for spin control are governed by the characteristic spin-orbit length of the electron spins, which must be larger than the dimen…
In this study, improvement in the electrochemical performance of the nickel hydroxide film electrode has been pursued by (i) using nonionic surfactant Brij 56 as the structure-directing agent, (ii) varying the deposition potentials, and (iii) varying the anneal temperatures. Nanoporous nickel hydroxide films are succe…
The structural properties of generation 4 (G4) poly(amidoamine) starburst dendrimers (PAMAM) with an ethylenediamine (EDA) central core in D 2 O solutions have been studied by small-angle neutron scattering (SANS). Upon the addition of DCl, SANS patterns show pronounced inter-particle correlation peaks due to the stro…
We report on the synthesis and characterization of star-shaped strong polyelectrolytes and their precursor stars with up to 24 arms. To achieve this we polymerized 2-( N, N -dimethylamino)ethyl methacrylate (DMAEMA) by atom transfer radical polymerization employing a core-first attempt. Sugar-based scaffolds as well a…
We propose an artificial three-dimensional material that exhibits a strong resonance in the effective permeability in the visible spectral domain. This material may be implemented in a two-step procedure. First, a metamaterial made of densely packed metallic nanoparticles is fabricated that shows a Lorentz-type resona…
For the first time, a linear J-aggregate of cobalt porphyrin and its templated, nanostructured cobalt porphyrin/polypyrrole composite are formed in neutral aqueous solutions. With the assistance of ultrasonication under different preparation procedures, the nanocomposite can be electrochemically synthesized with unifo…
We present state-of-the-art electronic structure calculations for the Co$_2$MnSn full-Heusler alloy. We show that in its bulk form it is a half-metallic ferromagnet with the Fermi level being located within a tiny gap of the minority-spin density of states. Moreover the alloy shows the Slater-Pauling behavior with a t…
Applying the analytical closed-form solutions of the 'quasi-static' potential distribution around two conjoined resonant half-cylinders with different permittivities, reported in the first part of our manuscript, here we interpret these results in terms of our nanocircuit paradigm applicable to nanoparticles at infrar…
Following our recent development of the paradigm for extending the classic concepts of circuit elements to the infrared and optical frequencies [N. Engheta, A. Salandrino, A. Alu, Phys. Rev. Lett. 95, 095504 (2005)], in this paper we investigate the possibility of connecting nanoparticles in series and in parallel con…
The accurate description of molecule-surface interactions requires a detailed knowledge of the underlying potential-energy surface (PES). Recently, neural networks (NNs) have been shown to be an efficient technique to accurately interpolate the PES information provided for a set of molecular configurations, e.g., by f…
Molecular targeting and photodynamic therapy have shown great potential for selective cancer therapy. We hypothesized that monoclonal antibodies that are specific to the IGF1 receptor and HER2 cell surface antigens could be bound to single wall carbon nanotubes (SWCNT) in order to concentrate SWCNT on breast cancer ce…
Results are presented of single crystal structural, thermodynamic, and reflectivity measurements of the double-perovskite Ba2NaOsO6. These characterize the material as a 5d1 ferromagnetic Mott insulator with an ordered moment of approximately 0.2microB per formula unit and TC=6.8(3) K. The magnetic entropy associated…
The low-coverage adsorption of a molecular electron donor, tetrathiafulvalene, on Au(111) is characterized by the spontaneous formation of superlattice of monomers, whose spacing exceeds the equilibrium distance of non-covalent interactions and depends on coverage. The origin of this peculiar growth mode is due to a l…
We have investigated the dielectric anomalies associated with spin-ordering transitions in the tetragonal spinel ${\mathrm{Mn}}_{3}{\mathrm{O}}_{4}$ using thermodynamic, magnetic, and dielectric measurements. We find that two of the three magnetic ordering transitions in ${\mathrm{Mn}}_{3}{\mathrm{O}}_{4}$ lead to dec…
We performed first-principles calculations to investigate the possible magnetism induced by different concentrations of nonmagnetic impurities and vacancies in a $\mathrm{BN}$ sheet. Atoms of Be, B, C, N, O, Al, and Si are used to replace either B or N in the system as impurities. We discuss the changes in the density…
We provide a complete quantitative explanation for the anisotropic thermal expansion of hcp Ti at low temperature. The observed negative thermal expansion along the c axis is reproduced theoretically by means of a parameter free theory which involves both the electron and phonon contributions to the free energy. The t…
We report on simple experiment on temperature-dependent Hall effect measurements in GaMnAs single crystalline samples with Mn composition estimated at 0.05-0.3 at.% which is slightly below the onset of ferromagnetism. Impurity band transport is visible for Mn compositions of ~0.3 at.% as a clear metallic behaviour. Th…