Materials Literature
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Abstract Patterned macro porous p ‐type silicon has been produced using a conductive chromium and gold mask while the masking layers were electrically biased under a variety of conditions. The purpose of this work is to study the impact on pore formation near the mask edge by the modulation of the electric field orien…
The optical response of free standing graphene, with or without a perpendicular magnetic field, doping or gap, is studied theoretically by solving Maxwell's equations. Formulae for the reflection coefficient and the reflected polarization are derived in terms of the polarization of the incident electromagnetic wave in…
We study a space semidiscretization of a viscous diffusion equation, obtained as a singular limit of the viscous Cahn–Hilliard equation by letting the interfacial energy tend to 0. The semidiscrete solution is shown to converge uniformly in time and space to the continuous solution, on finite time intervals, as the di…
A new AB 2 monomer, 5-amino-4-hydroxyisophthalic acid hydrochloride, was synthesized and polymerized in poly(phosphoric acid) (PPA) to afford a carboxylic acid-terminated hyperbranched polybenzoxazole (HPBO). Taking advantage of the large number of peripheral carboxylic acid groups on HPBO, polyarm-star block copolyme…
Abstract The fabrication of polymer nanostructures by replication process using self‐ordered nanoporous alumina with different pore depth and pore diameter as template is reported here. The method entails vacuum infiltration of a Poly(methyl methacrylate) (PMMA) solution into the pores of the template, which was fabri…
We calculate the low-frequency magnetoplasmon excitation spectrum for a square array of quantum dots on a two-dimensional (2D) graphene layer. The confining potential is linear in the distance from the center of the quantum dot. The electron eigenstates in a magnetic field and confining potential are mapped onto a 2D…
Mn-doped indium tin oxide (ITO) films were deposited on polyethylene naphthalate (PEN) substrates using radio-frequency magnetron sputtering. The magnetic, electrical, and optical properties of the films deposited on PEN substrates were investigated by comparing with the properties of films grown on glass substrates a…
Coherent, epitaxial Pt films with root-mean-square surface roughness values of less than one unit cell were grown on (001) SrTiO3 substrates by dc sputtering. These Pt films served as bottom electrodes for epitaxial SrTiO3 tunnel barriers grown by rf magnetron sputtering. The SrTiO3 barriers were free of pinholes and…
Abstract Organic–inorganic composites consisting of natural rubber (NR), polypyrrole (PPy), and sodium montmorillonite (Na‐MMT) were synthesized via electrolytic admicellar polymerization. A constant potential of 9 volts was chosen for the synthesis. The PPy concentration was fixed at 100 m M , and the clay contents w…
ZnO nanostructures were grown on Si (111) substrates using: Pulsed Laser Deposition. The impact of growth temperature (Ts) and Ar pressure (PAr) on the morphology, crystal structure and photoluminescence was investigated. Various types of ZnO nanostructures were obtained. Self-forming arrays of vertically-aligned nano…
Cobalt ferrite (CoFe2O4) nanoparticles (∼12nm diameter) were suspended in the polymer liquid crystal hydroxypropyl cellulose (HPC)∕m-cresol to obtain a new type of ferronematic. Suspension of these particles in 35%wt HPC in m-cresol did not affect the appearance of the liquid crystalline phase as evidenced by small an…
We have fabricated epitaxial thin films of electron-doped manganite Ca1−xCexMnO3 (CCMO) with 0≤x≤0.08. The transport properties of CCMO films are very sensitive to substrate-controlled epitaxial strain. For the CCMO(x=0.05) film, the metallic transport characteristic is observed only on a nearly lattice-matched NdAlO3…
The irradiation of polymer surfaces with ion beams leads to pronounced chemical and physical modifications when the ions are scattered at the atoms in the polymer chain. In this way, different products of decomposition occur. Here we show that by changing the ion fluence and the mass of the ion the local mechanical pr…
A series of binary SB blend samples with various overall volume fraction of PS (Phi(PS)) and different discrete distribution of the block length (denoted as d(PS) or d(PB)) were prepared by mixing various asymmetric poly(styrene)-block-poly(butadiene) (SB) block copolymers with a symmetric SB block copolymer. The infl…
Abstract A new electrically conductive photoresist has been developed. It is based on the dispersion of silver nanoflakes in a negative‐tone photosensitive polyimide (PSPI) precursor. 2‐Mercaptopropionic acid was used as the surfactant to modify the silver nanoflake surface for the dispersion of silver nanoflakes in t…
In this study, we prepared microscale periodic rough structures consisting of parallel strips on a silicon surface. The width of each strip was equal to the gap between the strips, and the silicon surface was silanized with perfluorooctyltrichlorosilane. We studied the wetting characteristics of water drops as they ad…
Using an electron microprobe, we measured and characterized the Nd 3+ ion diffusion across a boundary between Nd doped and undoped ceramic yttrium aluminium garnet (YAG) for different temperature ramps and hold times and temperatures. The results show significant Nd ion diffusion on the order of micrometres to tens of…
A series of coil−rod−coil triblock copolymers (i.e., F3T8EO8, F3T8EO17, F3T8EO45, and F3T8EO125 ) with a mesogenic monodisperse conjugated oligomer comprising 3 fluorene, 8 thiophene, and 2 phenyl units as the rod and poly(ethylene oxide) (PEO) as the coil were synthesized. A reference compound, that is F3T8ME2, with…
With the combination of the Fourier synthesis method and the time-dependent linear stability analysis, a simple model was developed to describe the dynamic evolution of the initial interface instability. By using this simple model, the early instability stage of a planar interface during directional solidification of…
Metal oxide sols (ZnO, SnO 2, TiO 2, ZrO 2, Fe 2 O 3, NiO, Ga 2 O 3, MnO 2, In 2 O 3, CeO 2 ) were prepared by hydrolysis of chloro-alkoxo or acetylacetonato complexes, preventing precipitation. The sols were injected in a solution of tetradecene and an aliphatic amine at 160 °C and heated at the resulting temperature…