Materials Literature
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In this paper the preliminary results of the tensile behavior of reinforced steel in a large range of strain rates are presented. Tensile testing at several strain rates, using different experimental set-ups, was carried out. For the quasi-static tests a universal electromechanical testing machine with the maximum loa…
In this study, the effects of chemical foaming agent and nanoclay on the physical, mechanical, and morphological properties of composites based on HDPE and WF were described. To meet this objective, the nanoclay, HDPE and the coupling agent were compounded and granulated and mixed with WF and blowing agent in a twin-s…
BACKGROUND: Pears are exported in large quantities from South Africa, resulting in large revenues. Minimisation of quality losses once the fruit has reached the export destination is as important as following strict export and distribution protocols. Kafirin can form edible films. In this study an edible coating made…
Additive Ba(N 3 ) 2 as a source of nitrogen is heavily doped into the graphite—Fe-based alloy system to grow nitrogen-doped diamond crystals under a relatively high pressure (about 6.0 GPa) by employing the temperature gradient method. Gem-grade diamond crystal with a size of around 5 mm and a nitrogen concentration o…
This study reports column flow adsorption capacity for Pb and Cu of 56.54 mgg−1 and 5.75 mgg−1, respectively, using electrospun nanofibers (70–264 nm) of chitosan:polyacrylamide blend ratio 77:23 with glutaraldehyde cross-linking. The Freundlich isotherms gave a better fit than Langmuir. The fibers were applied in con…
In this work, corrosion experiments on 9Cr-ODS and CLAM steels were carried out in static Pb-Li at 873 K for 250 h. Both steels showed weight loss and softening near the surface after the exposure. Tensile properties did not change and creep properties degraded slightly for 9Cr-ODS steel. In contrast, CLAM steel showe…
Effects of Ag and Ti nanoparticle coatings on resonant Raman scattering in various ZnO thin films are presented. The longitudinal optical (LO) phonons, irrespective of the ZnO quality, exhibit an enhancement and a weakening by the Ag and Ti nanoparticle coatings, respectively. The enhancement (weakening) is always acc…
The compatibility and crystallization behavior of LLDPE blended with the three different molecular weights of NR were studied. The obtained single derivative decomposition peak from TGA measurements for LLDPE blended with the lowest molecular-weight natural rubber clarified the improved compatibility between LLDPE and…
Polyaniline (PANI), poly(N-methylaniline) (PNMA) and poly(aniline-co-N-methylaniline) (PANI-co-PNMA) coatings were synthesised on stainless steel (SS) surface (AISI 316) in two different supporting solutions, oxalic acid and sulphamic acid. PNMA and PANI-co-PNMA films failed to be synthesised in sulphamic acid solutio…
Nanosized silica hybrid silver complex (NSS) showing strong antifungal activity, in which nanosilver (nano-Ag) was bound to silica (SiO2) molecules, was synthesized via gamma-irradiation at room temperature. NSS was characterized via field emission scanning electron microscopy (FESEM), energy-dispersive X-ray spectros…
It has long been reported that a dl -alanine crystal grows considerably faster from its flat −c end than from its pointed +c end, showing typical unidirectional growth from the −c direction and exhibiting a polar needlelike habit. Surprisingly, our new experimental results reveal that the normally slow-growing hemihed…
Dendrimers are widely used for biological applications. However, their effect on protein stability has not been studied extensively. Typically, charged cationic dendrimers such as PAMAM dendrimers tend to destabilize proteins due to the cooperative binding of surface groups to the protein surface. We have studied the…
A simple design of an electromagnetic cloak is used to “hide” metallic cylinders placed near a horn antenna. The antenna's directivity with and without the cloak is studied with numerical simulations to verify the operation of the cloak.
Correlating metal to calcium (Me/Ca) ratios of marine biogenic carbonates, such as bivalve shells, to environmental parameters has led to contradictory results. Biogenic carbonates represent complex composites of organic and inorganic phases. Some elements are incorporated preferentially into organic phases, and other…
An ab initio calculation based on density functional theory is applied to study the new source of p-type conductivity in Li-N codoped ZnO. The calculated results show that the interstitial Li (Lii) easily binds with the substitutional Li defect at the Zn site (LiZn) and the substitutional N defect at the O site (NO).…
Structural hierarchy of chirality is observable in a diversity of biological and synthetic materials and related to some unusual physical properties. The transfer of chirality among different length scales is a crucial issue of both theoretical and technological interest. In this paper, a continuum model is developed…
The ignition of magnesium alloy chips is a problem during high speed dry machining in industry. It should be avoided in the practical production. Many factors including machining environment, material composition, tool geometry, cutting parameters etc. can influence the cutting processes. Among these factors, cutting…
The potential distribution of BaTiO${}_{3}$ single crystal ferroelectric domains was investigated by scanning Kelvin probe microscopy at room temperature with and without an electric field applied parallel to the (001) top surface. Immediate c domain surface potential inversion was observed after reaching the 6 V/mm c…
Microstructure development during sintering in 3 mol% Y2O3-stabilized tetragonal ZrO2 polycrystal (Y-TZP) was systematically investigated in two sintering conditions: (a) 1100-1650°C for 2 h and (b) 1300°C for 0-50 h. In the sintering condition (a), the density and grain size in Y-TZP increased with the increasing sin…
Thermal oxidation of a 3000 Al sheet rolled alloy was carried out in various atmospheres with a thermogravimetric analyzer (TGA). The effect of a flash anodized surface versus an untreated rolled surface is investigated. All samples were oxidized for 4 hours at 800°C. Samples oxidized in air, 100 % CO2 and 50% CO2–50%…