Materials Literature
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The methane pyrolysis on spherical SiO2 nanoparticles with mean diameter of 40-80 nm has been studied at temperatures 550-800 , methane flow rate 50-660 mL/min, and process duration 20-60 min. It is shown that this process results in the formation of core/shell composites with shells having thickness of ~1-12 nm which…
Experimental observations have shown that polycrystalline NiTi wires, strips and tubes develop inelastic strain via nucleation and growth of macroscopic martensitic domains under mechanical loading. These domains consist of almost fully-transformed grains, which result from micro-domains that are formed at the grain-s…
In Nature there are many examples of materials performing structural functions. Nature requires materials which are stiff and strong to provide support against various forces, including self-weight, the dynamic forces involved in movement, and external loads such as wind or the actions of a predator. These materials a…
Shape memory alloys (SMA) when subjected to deformation at low temperature can recover their original shape by heating above a temperature called Austenite transformation temperature. This original shape is sustained till the material is deformed again by an applied stress. This property makes the SMA a unique actuato…
The heterobimetallic compound [Cu(amppz)(μ-NC)Fe(CN)4NO] (amppz = 1,4-bis(3-aminopropyl)piperazine) has been prepared by the reaction of [Cu(amppz)(ClO4)]ClO4 and Na2[Fe(CN)5NO]⋅2H2O in aqueous solution and was characterized by IR spectroscopy, magnetic measurement, and X-ray single-crystal diffraction. The neutral co…
Phytoplankton and environmental variables were studied during a year in a shallow eutrophic lake and its inflow in the ‘depressed Pampa’ of Argentina. The taxa were classified according to the competitors, stress tolerators, ruderals and intermediate categories (CSR) model and were allocated to morpho‐functional group…
Lithium electrochemical and electrochromic (EC) performances of flexible tungsten/molybdenum mixed oxide (WMoxOyCz) films, deposited onto 40-Ω/square flexible polyethylene terephthalate/indium tin oxide substrates at room temperature (~23°C) and at the short exposed durations of 19-26 s using an atmospheric-pressure p…
Gold nanoparticle self assemblies are one-dimensional structures of gold nanoparticles. Gold nanoparticle self assemblies exhibit unique physical properties and find applications in the development of biosensors. Methodologies currently available for lab-scale and commercial synthesis of gold nanoparticle self assembl…
The epitaxial CrxFe3-xO4 films were fabricated by dc reactive sputtering on MgO (001) substrates. The longitudinal resistivity ρxx was enhanced 3 orders of magnitude with the increase of Cr content x from 0 to 0.87. The tunneling magnetoresistance like planar Hall effect in the CrxFe3-xO4 films was observed while the…
Actuators in the form of a helical spring made from shape memory alloy are attractive due to light weight, large recoverable deformation, high energy density and manufacturing simplicity. For their optimal design and control detailed information on evolution of phase and stress distribution within the material during…
Although the tensile behavior of shape memory alloys (SMAs) is relatively well understood, the effects of other modes of loading on SMA behavior are still unknown. To examine the influence of loading and specimen geometry on structural behavior and phase transformation morphology, this work presents an experimental ch…
Early embodiments of droplet interface bilayer (DIB)-based hair cell sensors demonstrated the capability of sensing discrete and continuous perturbations, including single flicks and constant airflow, respectively, of a hair structure that is held in close proximity to a single lipid membrane. In those studies, the us…
In this paper, polypyrrole was prepared using the vapor phase polymerization process on membrane filter. The resulting membrane filter is flexible with electrical conductivity of 6.7 S/cm. When used as a binder-free threedimensional porous electrode for supercapacitor, such membrane filter delivers high specific capac…
SiC f /Al PO 4 composites were prepared by laminating method. The slurry comprising Al(H 2 PO 4 ) 3 solution, multi‐walled carbon nanotubes ( MWCNT s), and Al 2 O 3 powder was used as matrix precursor. The complex permittivities of the composites were measured in the X‐band (8.2–12.4 GHz). The reflection loss was calc…
Cooperative upconversion luminescence of Yb3+-Yb3+ couples and three-center energy transfer mechanisms have been deeply investigated in Yb3+ doped and Yb3+-Tb3+ co-doped β-PbF2 nanoparticles. As sensitizer ions, the distribution of Yb3+ ions, which is a key factor that affects the cooperative upconversion luminescence…
In this work, the post-breakdown characteristics of metal gate/Al2O3/InGaAs structures were studied using surface analysis by x ray photoelectron spectroscopy. The results show that for dielectric breakdown under positive bias, localized filaments consisting of oxidized substrate atoms (In, Ga and As) were formed, whi…
A new 6H-type perovskite Ba3Fe2SbO9 has been synthesised for the first time. Synchrotron and neutron powder diffraction data reveal complete structural disorder between Sb and Fe in the octahedral perovskite B sites. This results in classical spin-glass behaviour, which we characterise using magnetic susceptibility, m…
The paper presents the conceptual design, modeling and prototyping of a novel rotary motor based on shape memory alloy (SMA) wires. The basic architecture of the device capitalizes on a SMA wire wound around a low-friction cylindrical drum. The backup force to the SMA wire is provided by a beam spring which generates…
Structural and electrostatic properties of nanoclusters of CdSe of diameter 1–2 nm are studied with first principle calculations to determine the optimal size for synthesizing microstructures. Based on robustness of the core structure, i.e., the retention of tetrahedral geometry, hexagonal ring structure, and overall…
This study was concerned with sourcing for suitable and reliable, safe and cheap alternative mercerizing agents that may improve the mechanical properties of cotton/ polyester blend fabric. The pH of the used liquor was evaluated. Cost analyses for the agents were investigated. Six alternative 19-23% mercerizing agent…