<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="6.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">M.-C. Lin</style></author><author><style face="normal" font="default" size="100%">Lin, K.-C.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Interaction between crystal violet and anionic surfactants at silica/water interface using evanescent wave-cavity ring-down absorption spectroscopy</style></title><secondary-title><style face="normal" font="default" size="100%">Journal of Colloid and Interface Science</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">Absorption spectroscopy</style></keyword><keyword><style  face="normal" font="default" size="100%">ADSORPTION</style></keyword><keyword><style  face="normal" font="default" size="100%">Anionic surfactants</style></keyword><keyword><style  face="normal" font="default" size="100%">aqueous solution</style></keyword><keyword><style  face="normal" font="default" size="100%">Article</style></keyword><keyword><style  face="normal" font="default" size="100%">Biophysics</style></keyword><keyword><style  face="normal" font="default" size="100%">carbon</style></keyword><keyword><style  face="normal" font="default" size="100%">Carbon-chain length</style></keyword><keyword><style  face="normal" font="default" size="100%">Cationic dyes</style></keyword><keyword><style  face="normal" font="default" size="100%">Chain length</style></keyword><keyword><style  face="normal" font="default" size="100%">Chromatographic separations</style></keyword><keyword><style  face="normal" font="default" size="100%">concentration (parameters)</style></keyword><keyword><style  face="normal" font="default" size="100%">Crystal violet</style></keyword><keyword><style  face="normal" font="default" size="100%">DESORPTION</style></keyword><keyword><style  face="normal" font="default" size="100%">Desorption rate</style></keyword><keyword><style  face="normal" font="default" size="100%">Dye-surfactant interaction</style></keyword><keyword><style  face="normal" font="default" size="100%">Dyes</style></keyword><keyword><style  face="normal" font="default" size="100%">electric conductivity</style></keyword><keyword><style  face="normal" font="default" size="100%">Electromagnetic wave reflection</style></keyword><keyword><style  face="normal" font="default" size="100%">Electrostatic repulsion</style></keyword><keyword><style  face="normal" font="default" size="100%">EW-CRDS</style></keyword><keyword><style  face="normal" font="default" size="100%">Hydrophobic interactions</style></keyword><keyword><style  face="normal" font="default" size="100%">hydrophobicity</style></keyword><keyword><style  face="normal" font="default" size="100%">Interfacial adsorption</style></keyword><keyword><style  face="normal" font="default" size="100%">Liquid chromatography</style></keyword><keyword><style  face="normal" font="default" size="100%">Micellization</style></keyword><keyword><style  face="normal" font="default" size="100%">molecular interaction</style></keyword><keyword><style  face="normal" font="default" size="100%">Molecular Probes</style></keyword><keyword><style  face="normal" font="default" size="100%">NaCl solution</style></keyword><keyword><style  face="normal" font="default" size="100%">Number density</style></keyword><keyword><style  face="normal" font="default" size="100%">Phase Change</style></keyword><keyword><style  face="normal" font="default" size="100%">priority journal</style></keyword><keyword><style  face="normal" font="default" size="100%">Ringdown spectroscopy</style></keyword><keyword><style  face="normal" font="default" size="100%">Silica</style></keyword><keyword><style  face="normal" font="default" size="100%">Silica surface</style></keyword><keyword><style  face="normal" font="default" size="100%">silicon dioxide</style></keyword><keyword><style  face="normal" font="default" size="100%">Sodium chloride</style></keyword><keyword><style  face="normal" font="default" size="100%">SPECTROSCOPY</style></keyword><keyword><style  face="normal" font="default" size="100%">Surface active agents</style></keyword><keyword><style  face="normal" font="default" size="100%">Surfactant</style></keyword><keyword><style  face="normal" font="default" size="100%">Surfactant aggregation</style></keyword><keyword><style  face="normal" font="default" size="100%">Surfactant concentrations</style></keyword><keyword><style  face="normal" font="default" size="100%">water</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2012</style></year></dates><urls><web-urls><url><style face="normal" font="default" size="100%">https://www.scopus.com/inward/record.uri?eid=2-s2.0-84861948384&amp;doi=10.1016%2fj.jcis.2012.04.041&amp;partnerID=40&amp;md5=92ed762990e7749d0421ee55e5bc94a4</style></url></web-urls></urls><number><style face="normal" font="default" size="100%">1</style></number><volume><style face="normal" font="default" size="100%">379</style></volume><pages><style face="normal" font="default" size="100%">41-47</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;Evanescent wave-cavity ring-down spectroscopy (EW-CRDS) is employed to characterize micellization of anionic surfactants and the related capability of removing cationic substance off the silica surface. Crystal violet (CV +) cationic dye is used as a molecular probe to effectively determine critical hemimicelle concentration (HMC) of surfactants on the surface. The HMC results are 1×10 -2, 4×10 -3, 8×10 -4, and 2.5×10 -4mol/L for sodium sulfate salts with a carbon-chain length of C-10, C-12, C-14, and C-16, respectively. A stronger hydrophobic interaction results in a less concentration required to undergo micellization. The HMC values on the surface are about half of those in solution. When NaCl solution is added, the electrolyte helps reduce the electrostatic repulsion between the anionic sulfate heads to facilitate the surfactant aggregation, and thus, the subsequent HMC is reduced. Furthermore, the probable phase change for dye-surfactant interactions on the surface at the concentration below HMC is observed, and the desorption rates of CV + are measured as a function of concentration and carbon-chain length of surfactants above HMC. Given each surfactant concentration at its respective HMC, the corresponding desorption rates are along the order of C-12&amp;lt;C-14&amp;lt;C-16&amp;lt;-C-10. The trend may be realized by two competing factors of hemimicelle size and number density. The consequences help with understanding how to apply surfactant in the chromatographic separation. © 2012 Elsevier Inc.&lt;/p&gt;
</style></abstract><notes><style face="normal" font="default" size="100%">&lt;p&gt;cited By 4&lt;/p&gt;
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