Materials Literature
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We present a new approach, cost-effective polymer-assisted deposition, to prepare self-assembled epitaxial BaTiO 3 −NiFe 2 O 4 nanocomposite films on LaAlO 3 substrates. Ferroelectric BaTiO 3 is embedded in the ferrimagnetic spinel NiFe 2 O 4 matrix. The composite shows both ferroelectric and ferrimagnetic properties.
The hierarchical morphology of a nanocomposite with aligned single-walled carbon nanotubes results in templated growth of a semi-crystalline poly(ϵ-caprolactone) that is highly robust. The composite structure shows a significant mechanical reinforcement of the polymer.
Galvanic reactions between metal ions and semiconductor wafers provide a simple and fast approach to grow high-quality metal nanoplates with controlled sizes and thicknesses and clean surfaces. For example, the image shows an SEM image of silver nanoplates with thicknesses of ∼28 nm and edge lengths of 400–450 nm grow…
Combining ultrafast coherent spectroscopy with nano-optical microscopy techniques offers a wealth of new possibilities for exploring the structure and function of nanostructures. In this paper, we describe newly developed nano-optical methods based on short-pulse laser sources with durations in the 10 fs regime. These…
Energies and atomic structures of asymmetrical $\ensuremath{\Sigma}11[110]$ tilt grain boundaries in copper have been computed using molecular dynamics with an embedded-atom potential. Two interesting effects have been found: (1) The boundaries dissociate into a low-angle and a high-angle boundary separated by a layer…
Abstract We report the synthesis and excellent two‐photon‐sensitized luminescence properties of a new complex [Eu(tta) 3 dmbpt] (tta = henoyltrifluoroacetonate; dmbpt = 2‐( N,N ‐diethyl‐2,6‐dimethylanilin‐4‐yl)‐4,6‐bis(3,5‐dimethylpyrazol‐1‐yl)‐1,3,5‐triazine) that exhibits the highest efficiency of lanthanide lumines…
Nanosheet gel structures are formed by a class of bis-acylurea organogelator molecules, which self-organize into regular 2D sheet morphologies having planar dimensions of several micrometers and thicknesses (ca. 2 nm) corresponding to their molecular lengths. The 2D self-assembly is a consequence of unique intermolecu…
The doping of metal on carbon can be significantly improved by plasma treatment in two ways: increased dispersion and stronger interactions between metal particles and the substrate, both leading directly to enhanced hydrogen spillover and, thereby, increased hydrogen storage. Thus, the hydrogen storage capacity of ac…
A protonated bifunctional pyridine-based tetrathiafulvalene (TTF) derivative (DMT-TTF-pyH)NO3 and a copper(II) complex Cu(acac)2(DMT-TTF-py)2 have been obtained and studied. Electronic spectra of the protonated compound show a large ICT (intramolecular charge transfer) band shift (Deltalambda=136 nm) compared with tha…
Recently LaNi 1– x Fe x O 3 materials have been indicated as good candidates for cathodes for intermediate temperature solid oxide fuel cells (IT-SOFCs), and LaNi 0.6 Fe 0.4 O 3 (LNF) showed the highest specific conductivity in the LaNi 1– x Fe x O 3 series. Here we report the results of our investigation on the perfo…
Abstract A liquid crystalline homopolymer that has photoisomerizable methoxyazobenzene groups in the side chain has been synthesized and characterized. Thin films of the nematic glassy phase of this polymer have been processed in order to study the absorption spectra and the vibrational and electronic circular dichroi…
Using molecular dynamics simulations in combination with scaling analysis, we have studied the effects of the solvent quality and the strength of the electrostatic interactions on the conformations of spherical polyelectrolyte brushes in salt-free solutions. The spherical polyelectrolyte brush could be in one of four…
The coupling of quantum dots on carbon nanotubes was materialized based on a novel plasma surface polymerization. The quantum dot activated carbon nanotubes exhibited intense visible light emissions in both fluorescent spectroscopy and in vivo imaging. This novel nano scale design can be used as an effective biomarker…
Functional amphiphilic polymers designed to assemble at interfaces between a nematic liquid crystal and immiscible aqueous phases trigger ordering transitions that result in changes in the optical appearance of the liquid crystal (see figure and cover). The resulting polymer-functionalized interfaces respond reversibl…
The electronic structure of Mn 2 NiGa has been studied using density functional theory and photoemission spectroscopy. The lower-temperature tetragonal martensitic phase with c / a = 1.25 is more stable compared to the higher-temperature austenitic phase. Mn 2 NiGa is ferrimagnetic in both phases. The calculated valen…
X-ray absorption spectroscopy (XAS) has been used to probe the local structure of doped vanadium pentoxide materials prepared through sol–gel processes. The doped samples have been analyzed at the vanadium K-edge as well as at the doping metal K-edge (copper and zinc). The presence of two metal sites gives two indepen…
A system where archaeal gene expression could be controlled by simple manipulation of growth conditions would enable the construction of conditional lethal mutants in essential genes, and permit the controlled overproduction of proteins in their native host. As tools for the genetic manipulation of Haloferax volcanii…
A high electric field impedance experiment on supercooled molecular liquids is employed to transfer energy to the slow modes by absorption from the field and detect the increase of their "configurational temperature", T(cfg), via the change of the relaxation times. This allows us to determine the configurational heat…
Highly ordered mesoporous carbons have been synthesized from a direct triblock-copolymer-templating process of organic–organic self-assembly. The organic precursors are phenol, formaldehyde, and a functional monomer of p -fluorophenol, and the organic structure directing agent is triblock copolymer Pluronic F127. Char…
Electron transmission through insulating polymer nanocapillary (diameter $200\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$ and aspect ratio 50) foils has been investigated for incident energies 500 and $1000\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$. Significant intensities of transmitted electrons were observed for foil tilt…