Materials Literature
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We prepared novel hydrogen-bonded liquid-crystalline polyurethane complexes from 4-dodecyloxybenzoic acid and polyurethane containing pyridyl units in the main chain, based on 2, 6-bis(hydroxymethyl) pyridine. The complexes were investigated by differential scanning calorimetry, polarizing optical microscopy, and X-ra…
The aim of the research was to explore the effect of household fabric softeners on the textile hand rates after repeated washing cycles. The behavior of three pure cotton and one cotton-PES blended textile materials, which were different in type, structure, thickness and finishing, were investigated in the multifold w…
The spallation of oxide scales from the steam side of tubes in power generation boilers can severely limit component life time. The process involves through scale cracking and crack propagation at or parallel to the scale/alloy interface. Many techniques have been developed in the past two decades to assess the interf…
X-ray absorption spectroscopy was used to study the local structure and chemical bonding of elemental phosphorus. Three allotropes of this element exist in the solid state. The most common of these is the amorphous red phosphorus. The other two are crystalline: white phosphorus and black phosphorus. In the gas phase t…
There is pressure on the rubber industry to reduce, or even remove, the zinc oxide used in rubber compounds, because of concerns that zinc chemicals may have adverse effects on the aquatic environment. An EUsupported project, entitled Ecozinc, was set up to determine the scope for reducing, or eliminating, the zinc ch…
The microstructure and crystal structure of oxide films in different depth of oxide thickness, and the morphology of fracture surface of oxide films, which are formed on Zircaloy-4 specimens during the autoulave tests in deionized water at 360 ℃/ 18.6MPa, have been investigated by transmission electron mi- croscopy, s…
A method to optimize the location and the dimensions of the corona ring is presented for EHV transmission line composite insulators. This method is used to handle the open boundary problem of the insulator model by means of the asymptotic boundary conditions. Then, in order to set the optimal goal, the finite element…
Geographic associations of duplex soils, like the Estcourt form, and plinthic soils, like the Avalon and Westleigh forms, such as are found in the Eastern Free State, are recognised worldwide. These soils share redox morphology. In duplex soils, the redox morphology is dominated by a contrast in clay content between t…
The water treeing phenomenon has been recognized as an ultimate difficulty for long-term service life of cross-linked polyethylene (XLPE) insulated power cables. Elucidation of substantial mechanistic pathway of water treeing is quite important to suppress water treeing. Many factors which affect water treeing have be…
In the design and construction of waterfront structures, there is a need for development of a corrosion resistant, lightweight, cost effective and environmentally friendly structural material. Hybrid wood-plastic composite (WPC) - fiber-reinforced polymer (FRP) structural members would be corrosion resistant, and rela…
Corrosion prevention methods of materials are key technologies to increase in power generation efficiency, reduce in environmental pollution and realize maintenance-free in the waste-to-energy plants. Corrosion environment have became severe condition according to social demands such as increase in calolific value of…
Development of micro seismic generator for energy harvesting applications is presented. In order to fabricate MEMS-friendly high-performance electret film, CYTOP is adopted as an electret material and the charge density and the charge stability of CYTOP is experimentally characterized. When corona charging is employed…
Functional, conjugated molecular structures have been fabricated on Au nanoparticles via the Sonogashira coupling reactions.
A technique to prepare one-dimensional anisotropic photonic crystals and microcavities based on anisotropic porous silicon exhibiting optical birefringence has been developed. Reflectance spectra demonstrate the existence of a photonic band gap and of an allowed microcavity mode at the photonic band gap center. The sp…
The growth direction of solid phase, which has a great influence on the grain selection, has been investigated. Transparent organic systems, succinonitrile–H2O alloy and pivalic acid–H2O alloy have been used for unidirectional solidification. Essential parameters of phase diagrams, distribution coefficient of H2O (k)…
Abstract The technique of fluid dynamic gauging has been successfully applied to assess the adhesion characteristics of thin (< 1 mm) layers of calcium sulphate deposits serving as mimics of mineral scales often found on heat transfer surfaces. The shear strength of the scale layers increased on ageing; layers aged…
It is necessary to acquire the mechanical properties of advanced plain-weave fabrics as design parameters for application to ultra-light structures. In this study, biaxial tensile experiments of cruciform specimens with an open hole were conducted to evaluate the strength of coated plain-weave fabrics composed of spec…
A negative working photosensitive polyimide (PSPI) for use as a semiconductor surface coating material has been developed. This material has been widely used as a buffer coating to protect electrical circuitry on IC chips in the semiconductor market. We have now developed a new negative working photosensitive polynorb…
In Ag electroless plating, Ag agglomeration has been the obstacle to obtain thin Ag films. The crystallographic misfit between the substrate and Ag can accelerate Ag agglomeration. In this paper, Au, whose crystallographic characteristics are similar with those of Ag, is used as the activation material. As a result, t…
The polymerization and pore sealing that occurs during fluorocarbon plasma treatment of nanoporous silica xerogel was investigated experimentally by Rutherford backscattering spectroscopy and successfully modeled using a diffusion-reaction analysis. was used as a reactant gas to expedite the rate of polymerization due…