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The electrophoretic mobility of nitrogen gas bubbles was measured in solutions of different n-alkylammonium chlorides in a cylindrical cell, 30mm in diameter and 70mm in length, rotating in order to keep the bubbles on a line of the rotation axis of the cylinder. An electric charge field was applied to the solutions through two electrodes located at both ends of the cylinder. The mobility was measured...
We investigate the fluorescence quenching phenomenon that water-soluble CdSe quantum dots exhibit upon aggregation. First, we synthesize the hydrophobic CdSe quantum dots and convert them water-soluble using surface-ligand exchange with mercaptoacetic acid. We then induce aggregation of CdSe quantum dots by adding electrolyte to suspension. To monitor the change in photochemical and physical properties...
Thioglycolic acid (TGA) capped CdTe quantum dots (QDs) with the diameter of 2–3nm were synthesized. The interaction between CdTe QDs and chymotrypsin (chy) was investigated by ultraviolet–visible (UV–vis) absorption, fluorescence and resonance Rayleigh scattering (RRS) spectroscopy. Under pH 7.2, CdTe QDs effectively quenched the intrinsic fluorescence of chy via static quenching. The binding constants...
The objective of the present work is to develop a voltammetric method for the determination of entacapone based on the enhancement effect of Tween 20. Addition of neutral surfactant (Tween 20) to the entacapone containing electrolyte enhanced the reduction current signal while anionic surfactant (sodium lauryl sulphate) and cationic surfactant (cetrimide) showed an opposite effect. The reduction process...
Butyl-α,β-bis(dodecylimidazolium bromide) ([C 12 -C 4 -C 12 im]Br 2 ) is a new type ionic liquid-based Gemini surfactant. Multiwalled carbon nanotubes (MWCNTs) can be dispersed effectively in [C n -C 4 -C n im]Br 2 aqueous solutions due to its special molecular structure, including two imidazole ring head groups and two hydrophobic chains...
The aim of the study was to determine changes of enantiomeric fraction (EF) of chiral compounds interacting with components of soil and to describe the effect of amount of soil components on EF value.Soil components (humic acid and ash) were isolated from soil using method recommended by the International Humic Substance Society (IHSS). Dichloromethane was used as an extraction solvent for extraction...
A novel waterborne epoxy acrylate (WEA) was synthesized using bisphenol A epoxy resin as basic resin (E-44), acrylic acid (AA) and maleic anhydride (MA) as modification agent. Nano-silica sol was synthesized by a sol–gel method using tetraethyl orthosilicate (TEOS) as precursor. The UV curable waterborne epoxy acrylate/silica sol hybrid materials were prepared by UV radiation, in which the synthesized...
This paper studies the thermodynamic characteristics of ultrasound-activated release of Doxorubicin (Dox) from micelles. The release and re-encapsulation of Dox into Pluronic ® P105 micelles was measured by recording the fluorescence of a solution of 10μg/ml Dox and 10wt% P105 polymer in phosphate-buffered saline, during and after insonation by ultrasound at three temperatures (25°C, 37°C...
Cationic hydrocarbon surfactant, N-cetylpyridinium chloride (CPC), was mixed with an anionic fluorocarbon surfactant, 1,1,11-trihydroperfluorohendecylsulfate ammonium (THFHS). The phase behavior of CPC/THFHS mixtures in aqueous solutions was studied at the total surfactant concentration of 100mmolL −1 . From CPC-richer side, with THFHS increasing, one observes the phase behavior sequence of...
Copper nanoparticles (CuNPs) are prepared in aqueous medium with hydrazine hydrate as the reductant. Different stabilizers PVA, PVP and starch are considered. For each stabilizing agent, the effect of concentration of NaOH on the synthesis of CuNPs is investigated. The structural characterization of CuNPs dispersed in aqueous medium has been done with the help of small angle X-ray scattering (SAXS)...
Synthesis of stable palladium nanoparticles by the facile reduction of palladium chloride with citric acid and sodium citrate separately has been carried out in an aqueous solution of steric stabilizer polyvinyl alcohol (PVA). The resulting palladium nanoparticles have been characterized by physico-chemical, spectroscopic, microscopic, and cyclic voltametric studies. The average size of the nanoparticles...
The contour evolution and sliding behavior of molten Sn–3.0wt.%Ag–0.5wt.%Cu on tilting Cu and Al 2 O 3 substrates were investigated. Experiments were performed to determine how the upper and lower contact angles and the sliding behavior changed with tilted angle of surface, kind of substrates and temperature. When the molten drop, as a whole, slid down the tilting solid surface, the...
Dry-powder aggregates of biocompatible silica nanoparticles are manufactured by the spray-drying technique to be potentially developed as an inhaled drug delivery vehicle. The micron-scale nano-aggregates are specifically designed to exhibit large, hollow, and spherical morphologies in order to achieve high aerosolization efficiency and an effective deposition in the lung. In addition to the specific...
Highly monodisperse silver nanoparticles were synthesized by chemical reduction of silver nitrate dissolved in water core of one microemulsion and sodium borohydride (reducing agent) dissolved in water core of another microemulsion. The surfactant used in the study was di-octyl sodium sulfosuccinate or aerosol OT (AOT), which is an effective surfactant for synthesizing silver nanoparticles in microemulsion...
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