Materials Literature
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We make use of inherent vacancies and nitrogen substitutions in nanodiamonds to generate nitrogen-vacancy (NV) centers by high temperature annealing. After 800 °C annealing, low temperature photoluminescence intensity of nanodiamonds shows more than eight times improvement compared with that of unannealed samples. Con…
The performance of cross-linked polyethylene with and without tree-retarding additives, aged with single and reversed polarity DC voltage was investigated. Under single polarity field of a 50 kV/mm, cross-linked polyethylene without the tree retardant (XLPE) showed significantly longer time to breakdown than the mater…
The influence of temperature on water treeing in polyethylene (PE) is investigated in this paper. Low-density polyethylene (LDPE) and peroxide cross-linked polyethylene (XLPE) are chosen as the test materials. The liquid needle electrode method is used for water tree development at 20, 40, 60 and 80 °C, and a metallog…
We present the results of a three-year collaboration between the U.S. Army Edgewood Chemical Biological Center and the U.S. Army Research Laboratory-Aldelphi Laboratory Center on the evaluation of selected nanometallic surfaces developed for the Defense Advanced Research Projects Agency Surface-Enhanced Raman Scatteri…
The present study was directed to evaluate the toxic effects of orally administered titanium dioxide naonparticles (TiO2) on liver of male albino rats and to evaluate the ameliorative effects of N-acetylcysteine (NAC). Forty adult male albino rats were divided into 4 groups; control group, NAC group, TiO2 group and Ti…
In the present study, we investigate the evolution with shear of the viscosity of aqueous suspensions of size-selected natural swelling clay minerals for volume fractions extending from isotropic liquids to weak nematic gels. Such suspensions are strongly shear-thinning, a feature that is systematically observed for s…
Dendrimers with fully photodegradable backbones were synthesized through the incorporation of photodegradable o-nitrobenzyl esters into a new dendrimer monomer based on 2,2-bis(hydroxymethyl)propionic acid (bis-MPA). Dendrons were synthesized using a divergent approach, and were subsequently coupled to a core molecule…
The inhibiting effect of some quinazoline derivatives on the corrosion of carbon steel in 2 M HCl was studied by weight loss, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM) and energy dispersion spectroscopy (EDS) techniques. The results showed that the i…
This paper compares the performance of HTV (high temperature vulcanized) silicone rubber power line insulators under AC and both polarities DC when subjected to natural pollution. The investigation was conducted at Koeberg Pollution Test Station (KIPTS) which is situated near Cape Town and is known for its severe coas…
This paper reported a new application of graphene that is graphened thermistor. Mono-layer, bi-layer and few-layer graphene devices with different dimensions were designed and fabricated. Temperature sensing behavior of graphene has been studied in a small temperature range from room temperature (RT) to 80°C because t…
Mineralization of alkaline-earth carbonates in silica-rich media at high pH leads to fascinating crystal morphologies that strongly resemble products from biomineralization, despite the absence of any organic matter. Recent work has demonstrated that elaborate CaCO 3 structures can be grown in such systems even at hig…
Doxorubicin, a potent anticancer drug associated with cardiotoxicity and low oral bioavailability, was loaded into apotransferrin nanoparticles to improve its pharmacological performance. Here, doxorubicin (doxo)-loaded apotransferrin nanoparticles were termed as Apodoxonano, and they were prepared by sol-oil chemistr…
The influence of Mg content (Mg/(Mg+Zn) atomic ratio) on the obtainable photovoltaic properties in Al-doped ZnO (AZO)/non-doped Zn 1-X Mg X O/Cu 2 O heterojunction solar cells using p-type Cu 2 O sheets prepared by thermally oxidizing Cu sheets was investigated. n-type Zn 1-X Mg X O thin films were prepared with vario…
Metallic helix metamaterial has been demonstrated to show strong circular dichroism and is promising for photonic applications such as broadband circular polarizers. In this paper, we present the analysis on the resonances of gold helix metamaterials by dipolar interactions and hybridization and discuss the origin of…
Temperature-dependent changes of the color of persistent (>0.3 s) phosphorescence are observed from a host–guest material containing donor and acceptor guests. Efficient thermally activated triplet–triplet reverse energy transfer is realized because of slow nonradiative decay of the donor at high temperature.
Abstract In the present study, the gradual layer-charge reduction of two Li-saturated smectites, SAz-1 from Arizona, USA, and FEO-G from Troodos, Cyprus, with octahedral charge of 0.54 electrons per half unit cell (e/huc) and 0.39 e/huc, respectively, was monitored by X-ray diffraction of K-saturated, ethylene glycol-…
A new instrument is presented for investigating interactions between individual colloidal particles, emulsion droplets, foam bubbles, and other particle-particle or particle-surface interactions. Measurement capabilities are demonstrated by measuring interfacial tension, coalescence time for emulsion droplets, adhesio…
Porous ZnO nanostructures have become the subject of research interest--due to their special structures with high surface to volume ratio that may produce peculiar properties for use in optoelectronics, sensing and catalysis applications. A microwave-assisted hydrothermal method has been used for effecting the formati…
This article presents the first systematic study concerning the effect of the oxidative treatment conditions on the surface chemical composition and the catalytic properties in the deep wet oxidation of organic ecotoxicants of a Sibunit type carbon material (S4) which was earlier identified as promising for the oxidat…
PCL-heparin conjugates were synthesized by coupling mono-hydroxyl terminated PCL (Mn = 2000-10000 g/mol) with heparin via EDC/NHS chemistry. The conjugates enabled to self-assemble into the core-shell nanoparticles in around 100 nm diameter to load binary anti-cancer drugs. Lipophilic and neutral paclitaxel (PTX) was…