Materials Literature
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Abstract Thin films of photoactive Cu 1.8 S have been deposited by atomic layer deposition (ALD) using Cu(thd) 2 and H 2 S as the precursors. This is a first step in the construction of nanoporous heterojunctions of TiO 2 /Cu 1.8 S. The ALD process can be divided into two temperature regimes: below 175 °C, adsorption…
Magnetic circular dichroism (MCD) spectra of a room-temperature ferromagnetic GaN:Mn film show that the film contains Ga1−xMnxN in which the band s,p-electrons interact with the d-electrons of the manganese ions. Both the magnetic field dependence and the temperature dependence of the MCD intensity show that Ga1−xMnxN…
We report the operation of a potential nonvolatile bistable capacitor memory element consisting of a metal gate, a 170 nm thick ferroelectric Langmuir–Blodgett film of vinylidene fluoride (70%) with trifluoroethylene (30%) copolymer, and a 100 nm thick silicon-oxide insulating layer, all deposited on an n-type silicon…
Abstract Polyaniline/nano‐SiO 2 particle composites were prepared through ultrasonic irradiation. Polymerization of aniline was conducted under ultrasonic irradiation in the presence of two types of nano‐SiO 2 : porous nanosilica and spherical nanosilica. The stability of the colloid dispersion, UV–vis spectra, compos…
We present a direct measurement of self-diffusion of a single-component glass-forming liquid at the glass transition temperature. Forward recoil spectrometry is used to measure the concentration profiles of deuterio and protio 1,3-bis-(1-naphthyl)-5-(2-naphthyl)benzene (TNB) following annealing-induced diffusion in a…
BaTiO 3 / SrTiO 3 superlattices are found to have a critical periodicity of 30 SrTiO3 unit cells, below which the room-temperature symmetry is mm2 orthorhombic. The orthorhombic-tetragonal phase-transition temperature is shifted upward from the bulk value (<3 K and normally not observed at finite temperature) o…
A new type of porous silica bead (see Figure) with a narrow size distribution, useful for applications such as catalysis, biomolecule immobilization, and chromatographic separation, can be synthesized via a novel emulsion templating/sedimentation polymerization route. This method might be scaled up for the synthesis o…
We report the synthesis, film formation, protein resistance, and specific antigen binding capability of a carboxy-functionalized poly(ethylene glycol) alkanethiol [HOOC−CH 2 −(OCH 2 −CH 2 ) n −O−(CH 2 ) 11 −SH, n = 22−45]. Despite its polymeric character, the molecule is found to form a densely packed self-assembled m…
The spectroscopic properties and thermal stability of Er2O3 doped Bi2O3–B2O3–Na2O glasses are investigated experimentally. A close correlation is observed between the B2O3 content and the spectroscopic properties such as Judd–Ofelt intensity parameters Ωt (t=2,4,6), emission spectra, and lifetime of I13/24 level of Er…
This letter describes the electrical control of structure and lasing in the photonic bandgaps of cholesteric liquid crystals (CLCs). Photoexcitation of dye-doped CLC cells with a linearly polarized laser gives rise to laser emission at the edge(s) of the chiral photonic band gap. Applying voltages to the optically pum…
Tunable electronic lenses using gradient polymer network liquid crystal (PNLC) cells were demonstrated. By changing the photomask pattern, both positive and negative lenses were fabricated. The advantages of such a PNLC lens are low operation voltage, large aperture size, and simple electrode design. To overcome the p…
An electroactive pentathiophene surfactant containing a phosphonic acid head group was designed and shown to provide strong binding to the surface of a CdSe nanocrystal and facilitate charge transfer between the nanocrystal and an organic semiconducting matrix (see Figure). Incorporation into organic–inorganic heteroj…
The objective of the present investigation was to fabricate composite colloidal particles consisting of a sacrificial, decomposable template of biodegradable nature covered with biocompatible polyelectrolyte multilayers using the layer-by-layer sequential adsorption technique. Poly-dl-lactic acid and poly(dl-lactic-co…
A new set of wheels: Substituting a chromium ion in [Cr8F8(O2CCMe3)16] with one of a number of alternative transition metals has yielded an unprecedented family of heterometallic wheel complexes (see picture), supported at their centers by secondary ammonium ions. Both 3d (Mn, Fe, Co, Ni) and 4d (Cd) metals have been…
Co‐assembly of binary dispersions of monodisperse microspheres with large size ratios has been used to produce well‐ordered hexagonally close‐packed monolayers of large spheres with a superimposed pattern of small spheres (see Figure). The architectures obtained are determined by the size and concentration ratios of t…
A semicontinuum model is presented for nanostructured materials that possess a platelike geometry, such as ultra-thin films. In contrast to the classical continuum theory, the current model accounts for the discrete nature in the thickness direction. In-plane Young’s modulus, and in-plane and out-plane Poisson’s ratio…
Ultraviolet photoemission spectroscopy is used to determine the energy level alignment at interfaces between three electroactive conjugated organic molecular materials, i.e., N,N′-bis-(1-naphthyl)-N,N′-diphenyl1-1,1-biphenyl1-4,4′-diamine; para-sexiphenyl; pentacene, and two high work function electrode materials, i.e…
Rapid progress in the synthesis and processing of materials with structure on nanometer length scales has created a demand for greater scientific understanding of thermal transport in nanoscale devices, individual nanostructures, and nanostructured materials. This review emphasizes developments in experiment, theory,…
Worldwide experience with polymer concrete high-voltage insulators is surveyed. Particular attention is given to the Brazilian experience, the UK initiative, and the introduction of such insulation in India.>
In the classical partial discharge (PD) measuring circuit the current represents the signal that allows the detection of PDs in the tested sample. This current is converted into a voltage by the measuring impedance, amplified, and filtered. The integration process is essential. A standard calibrator for testing integr…