Materials Literature
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We report a novel method for depositing patterned dielectric layers with sub-micron features using atomic layer deposition (ALD). The patterned films are superior to sputtered or evaporated films in continuity, smoothness, conformality, and minimum feature size. Films were deposited at 100-150C using several different…
In $R{\mathrm{B}\mathrm{a}\mathrm{C}\mathrm{o}}_{2}{\mathrm{O}}_{5+x}$ compounds ($R$ is rare earth), a ferromagnetic-antiferromagnetic competition is accompanied by a giant magnetoresistance. We study the magnetization of detwinned ${\mathrm{G}\mathrm{d}\mathrm{B}\mathrm{a}\mathrm{C}\mathrm{o}}_{2}{\mathrm{O}}_{5.5}$…
Ultralong Bi 2 S 3 nanoribbons have been synthesized by a solvothermal process, using a mixture of aqueous NaOH solution and glycerol as the solvent. These nanoribbons (see Figure) are 50–300 nm wide, 20–80 nm thick, and up to several millimeters long, and the initial formation of the precursor polycrystalline NaBiS 2…
Acidic proteins play a major role in the biomineralization process. These proteins are generally thought to control mineral formation and growth. Thus, characterization of individual acidic proteins is important as a first step toward linking function to individual proteins, which is our ultimate goal. In order to cha…
A photonic paper/ink system for color writing on and with colorless materials is described. The “paper” is a 3D crystal of polymer beads embedded in an elastomer matrix made of poly(dimethylsiloxane) (PDMS), and the “ink” is a liquid (e.g., a silicone fluid or organic solvent) capable of swelling the matrix, changing…
Synthetic biomaterial matrices have been formed in the presence of cells by a Michael‐type addition reaction between a difunctional protease substrate peptide, a monofunctional cell adhesion peptide, and a tetrafunctional poly(ethylene glycol). These materials locally degrade in response to cell‐surface proteases, all…
Abstract An overview of the electrochemistry of poly(3,4‐alkylenedioxythiophene)s (PXDOTs) is presented. As a class of conducting and electroactive polymers that can exhibit high and quite stable conductivities, a high degree of optical transparency as a conductor, and the ability to be rapidly switched between conduc…
Abstract The microstructures of as-cast and slowly solidified Al– Cu–Fe ternary alloys in the vicinity of the icosahedral phase region have been investigated using light microscopy and scanning electron microscopy. The chemical composition of the different phases present has been determined by energy-dispersive X-ray…
Abstract The stress– strain behavior of thin copper wires in the range 20 – 250 μm diameter and various purities (3N, 5N) have been investigated. The wires were subjected to a recrystallization heat treatment and tensile properties were determined. Tensile testing was performed using a microtensile testing machine equ…
The electromagnetic properties and thermal behavior of Mn-Zn ferrite cores for the blocking filter of Power Line Communication(PLC) application were investigated as a function of additives. The highest density and permeability were 4.98 g/<TEX>$\textrm{cm}^2$</TEX> and 8,221, respectively and were obtained to the spec…
The simulation of the 1×1 rib loop formation process on a dial and cylinder machine has been dealt with. Various concepts such as geometry of knitting zone, wrap angles, loop arm configurations under various stages of loop formation, etc. of the 1×1 rib loop formation have been developed. Six different types of loop a…
The well-known Treloar-Hearle (T-H) theory of fiber migration, although more realistic in defining the yarn structure than the helical model, suffers from certain internal inconsistencies such as singularities at the yarncore. This paper aims at re-examining the theory of fiber migration and establishing a new basis f…
The penetration of long rods (L/D10) into standard RHA targets differs with rod failure and flow, which produces erosion and deceleration. Oriented, columnar grained W and [001] single crystal W-4%Ta rods exhibit dense shear/shear band flow phenomena consisting of overlapping bands ofpredominantly dynamically recrysta…
Abstract Well‐defined poly(ethylene oxide)s (PEOs) bearing reactive sites regularly distributed along the chain have been synthesized by the polycondensation of PEO containing a central tertiary amino group with dichloromethane, followed by quaternization with suitable reagents to obtain polyzwitterionic or cationic P…
We report findings on the electrokinetic and solubility behaviors of (Ba,Ca)(Ti,Zr)O 3 (BCTZ) powders having three different [Ba + Ca]/[Ti + Zr] ratios: 0.995, 1.000, and 1.005. Electrokinetic and solubility properties of BCTZ powders in aqueous media are phenomenologically similar to BaTiO 3 . Ba and Ca ions, occupyi…
The surface roughness is one of the main parts of hand prediction. Classical method of surface roughness measurements is based on the surface profile measurement. Characteristic of roughness is then variation coefficient of surface profile (surface height variation). The main aim of this work is to estimate the surfac…
A significant proportion of the nanoparticles of chromium prepared by plasma gas condensation are nanocubes. We have found by electron diffraction and high-resolution transmission electron microscopy that each nanocube of chromium is enclosed by an epitaxial passive oxide film. The oxide film has been identified as fc…
Abstract Single crystal growth experiments for NaKSi 2 O 5 and Na 0.67 K 1.33 Si 2 O 5 have been successfully performed by hydrothermal crystallization of two glasses at 500°C and 1 kbar during 24 hours. For a glass with a Na : K ratio of 1 : 1 a previously unknown NaKSi 2 O 5 modification named phase II was obtained.…
The reaction of Cu(ClO 4 ) 2 ·6H 2 O, imidazole (ImH), and ethylenediamine (en) in a 1 : 2 : 1 ratio afforded in high yield dark-blue single-crystals of [(en)Cu II (ImH) 2 ](ClO 4 ) 2 , 1, which can be used after deprotonation as a building block for heterometallic ferrimagnetic chains. The structural and electronic p…
Boron-free E-CR glass fibres offer a number of benefits over traditional E-glass. Freelance writer S. Sundaram reports on Canadian company Fiberex’s products.