Browsing by Subject "silicon dioxide"
Now showing items 1-12 of 12
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Americium and samarium determination in aqueous solutions after separation by cation-exchange
(2014)The concentration of trivalent americium and samarium in aqueous samples has been determined by means of alpha-radiometry and UV-Vis photometry, respectively, after chemical separation and pre-concentration of the elements ...
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Analytical separations in open-tubular capillary electrochromatography
(2003)This review represents a summary of recent progress in open-tubular capillary electro-chromatography (OT-CEC) for chiral and achiral separations. The OT-CEC approach is an alternative to packed-CEC that could eliminate the ...
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Analytical separations using molecular micelles in open-tubular capillary electrochromatography
(2002)Open-tubular capillary electrochromatography (OT-CEC) is an alternative approach to conventional CEC. The primary advantage of OT-CEC is the elimination of problems associated with frits and silica particles in conventional ...
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Application of different types of resins in the radiometric determination of uranium in waters
(2011)The aim of this study is to compare different resins regarding their separation and pre-concentration efficiency for uranium from aqueous solutions and its subsequent radiometric determination by liquid scintillation ...
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Chiral Separations Using Polymeric Surfactants and Polyelectrolyte Multilayers in Open-Tubular Capillary Electrochromatography
(2003)In this study, fused-silica capillaries are modified using a polyelectrolyte multilayer (PEM) coating procedure in open-tubular capillary electrochromatography. The PEM coating was constructed in situ with alternating ...
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Controlled production of ZnO nanoparticles from zinc glycerolate in a sol-gel silica matrix
(2006)The controlled production of ZnO nanoparticles within an amorphous silica matrix is achieved using a new methodology consisting of four stages. First, precursor zinc glycerolate nanoparticles are produced within reversed ...
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The effect of physicochemical parameters on the separation recovery of plutonium and uranium from aqueous solutions by cation exchange
(2010)The effect of physicochemical parameters such as pH, salinity (e.g. [NaCl]) and competitive cation (e.g. Ca 2+ and Fe 3+) concentration on the separation recovery of plutonium and uranium from aqueous solutions by cation ...
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Hofmeister anion effects on surfactant self-assembly and the formation of mesoporous solids
(2002)Recent work on mesoporous silica formation using cationic and non-ionic templates has unveiled a large number of anion effects. Anions are seen to change the hydrolysis rates of the silicate precursors, affecting the surface ...
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Open-tubular capillary electrochromatography using a polymeric surfactant coating
(2003)A stable polyelectrolyte multilayer (PEM) coating was investigated for use in open-tubular capillary electrochromatography (o-CEC). In this approach, the PEM consisted of the cationic polymer of a quaternary ammonium salt, ...
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Preliminary investigation of permeation profiles of selected head-space urine volatiles (2-Heptanone, n-Octanal) using IMS
(2012)The late location of entrapped victims in collapsed buildings is the main reason of high mortality during urban search and rescue (USaR) operations after natural or man-made disasters. Consequently, an effort is currently ...
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Regio- and stereoselective synthesis of enantiomerically pure [60]fullerene tris-adducts with an inherently chiral e,e,e addition pattern
(2005)The synthesis and flash column chromatographic separation of c enantiomerically pure tris-adducts of C60 with an e,e,e-addition pattern is achieved via cyclopropanation with chiral D3-symmetrical cyclo-tris(malonate) ...
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Uranium determination in water samples by liquid scintillation counting after cloud point extraction
(2010)The aim of this study is the radiometric determination of uranium in waters by liquid scintillation counting (LSC) after pre-concentration of the element by cloud point extraction (CPE). For CPE, tributyl phosphate (TBP) ...