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Aged transformer oil can be evaluated by conventional tests to assess the degradation in electrical, chemical and physical properties. However, proper evaluation requires expensive equipment, expertise and time for sampling and testing. UV-Vis spectroscopy is a nondestructive technique that can be conducted on-line with a lower cost and a simple manner. This study aims to investigate the impact of...
Silver nanoparticles have been found many interesting applications, such as absorption amplifiers in dye-sensitized solar cells. However, silver nanoparticles are easily oxidized. In order to protect silver nanoparticles, atomic layers of TiO2 were deposited onto silver nanoparticles coated to a glass slide. Then the glass slide was exposed to corrosive I-/I3− solutions, and the degree of silver etching...
The use of carbon nanotubes (CNTs) and other carbon materials as support for homogeneous catalysts is an untapped area, despite of their broad use as catalysts and as supports for metals in its reduced state. Conversely, CNTs present several advantages when compared to inorganic supports; they are thermally stable, resistant to chemical attack in acid and basic media [1,2]. In the present study, hydroxyl...
ZnS:Mn nanoparticles of different size have been synthesized using a co-precipitation method. So-prepared ZnS:Mn nanoparticles with capping agent (oleic acid) then were characterized using X-ray diffraction(XRD) and UV-Vis spectroscopy. The particle size of the nanoparticles calculated from the XRD patterns has been found in the range 1.45-2.65nm. Absorption spectra have been obtained using UV-Vis...
We have employed X-ray photoelectron spectroscopy (XPS), ultraviolet-visible (UV-vis) spectroscopy, infrared (IR) spectroscopy, water contact angle (WCA) measurements, ellipsometry, and electrical measurements to study the effects of self-assembled monolayers (SAMs) with phosphonic acid headgroups on the bonding and performance of cadmium sulfide (CdS) solid-state quantum dot sensitized solar cells...
The maghemite (γ-Fe2O3) nanoparticles were obtained via high temperature pyrolysis with the precursor of magnetite that was synthesized via chemical coprecipitation. Then the (3-aminopropyl) triethoxysilane (APTES) was used for the surface functionalization of γ-Fe2O3 nanoparticles. Finally the gold-coated maghemite (γ-Fe2O3/Au) nanoparticles are prepared via sonochemical synthesis of a solution mixture...
Zinc oxide (ZnO) is an emerging material in large area electronic applications such as thin-film solar cells and transistors. We report on the fabrication and characterization of ZnO nanostructures. ZnO nanostructures have been synthesized using sol-gel immerse technique on oxidized silicon substrates. Different precursor's concentrations ranging from 0.0001 M to 0.01 M (M=molarity) using zinc nitrate...
Rosette nanotubes (RNTs) are novel, biomimetic, synthetic, self-assembled drug delivery agents. Because of base stacking and hydrophobic interactions, the RNT hollow-tube structure can be used for incorporating drugs. Another advantage of using RNTs is their ability to be injected and become solid at body temperatures for orthopedic applications without the use of any external stimuli (such as UV...
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