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RISS 인기검색어
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- 저자 : Coté (검색결과 2 건)
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Nguyen, Viet Tu,Lee, Jae-chun,Jeong, Jinki,Kim, Byung-Su,Cote, Gé,rard,Chagnes, Alexandre American Chemical Society 2015 INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH - Vol.54 No.4
<P>The present work addresses Au(III) extraction from chloride media using phosphonium-based ionic liquid (Cyphos IL 109) as a novel anion exchanger diluted in xylene. Gold(III) is extracted into the organic phase as [P-66614(+)][AuCl4- ] and can easily be stripped by reduction to Au(I) with CS(NH2)(2)/HCl or Na2S2O3. A series of extraction-stripping cycles show a possible recirculation of used solvent without loss of performance, as far as the extraction of gold(III) from HCl/Cl- media is concerned. Au(III) was quantitatively (99.4%) extracted from 0.1 mol L-1 HCl initially containing 100 mg L-1 Au(III) with 0.8 g L-1 Cyphos IL 109 with two counter-current stages at O/A = 1, whereas total stripping as Au(I) with 0.02 mol L-1 CS(NH2)(2) in 5% HCl or 0.02 mol L-1 Na2S2O3 also needed two counter-current stages, at O/A = 3. Simulations of counter-current modes reveal Cyphos IL 109 can be considered a promising new extractant for complete recovery of Au(III) from Cl- media in pilot scale.</P>
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Multidomain-Based Responsive Materials with Dual-Mode Optical Readouts
You, Yil-Hwan,Biswas, Aniket,Nagaraja, Ashvin T.,Hwang, Jin-Ha,Coté,, Gerard L.,McShane, Michael J. American Chemical Society 2019 ACS APPLIED MATERIALS & INTERFACES Vol.11 No.15
<P>Responsive materials designed to generate signals for both surface-enhanced Raman spectroscopy (SERS) and phosphorescence lifetime-“dual-mode”-measurements are described. To demonstrate this concept, we incorporated pH-sensitive and oxygen-sensitive microdomains into a single hydrogel that could be interrogated via SERS and phosphorescence lifetime, respectively. Microdomains consisted two populations of discrete microcapsules containing either (1) gold nanoparticles capped with pH-sensitive Raman molecules or (2) oxygen-sensitive benzoporphyrin phosphors. While the microdomain-embedded hydrogels presented an expected background luminescence, the pH-sensitive SERS signal was distinguishable for all tested conditions. Response characteristics of the dual sensor showed no significant difference when compared to standalone single-mode pH and oxygen sensors. In addition, the feasibility of redundant multimode sensing was proven by observing the reaction produced by glucose oxidase chemically cross-linked within the corresponding alginate matrix. Each optical mode showed a signal change proportional to glucose concentration with an opposite signal directionality. These results support the promise of micro-/nanocomposite materials to improve measurement accuracy using intrinsic multimode responses and built-in redundancy, concepts that have broad appeal in the chemical sensing and biosensing fields.</P> [FIG OMISSION]</BR>
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