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ndltd-OhioLink-oai-etd.ohiolink.edu-osu1302028057
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oai_dc
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ndltd-OhioLink-oai-etd.ohiolink.edu-osu13020280572021-08-03T06:02:13Z Micellar autocatalysis and mixed michelle thermodynamics Kust, Paul Roger <p>Micellar effects on reaction rate were not observed in the syntheses of quaternary ammonium and carboxylate surfactants; reactions were too fast or too complex to make accurate determinations of reaction rates for these systems. To improve determination of micellar concentrations in micellar kinetic models, the thermodynamics of surfactant mixtures was investigated as a model to describe micellar solubilization. Two modifications to the traditional pseudophase model were studied that incorporate electrostatic effects and counterion binding, and a comparison of the modified models using existing mixed surfactant <i>cmc</i> data demonstrates that the modifications can lead to different evaluation and interpretation of non-ideal behavior in surfactant mixtures as measured by fitted interaction parameters. These modified models fit existing <i>cmc</i> data for surfactant mixtures as well as <i>cmc</i> and pH data for amine oxide surfactant mixtures; the modified model not only fits the known minimum in the <i>cmc</i> of amine oxide with respect to pH, but the model also indicates the existence of a cmc maximum that was previously unreported but the existence of which is verified in this work.</p><p>Investigating the <i>cmc</i> behavior of a binary ionic/nonionic surfactant mixture at high pressure, it was found that the <i>cmcs</i> of the pure surfactants and surfactant mixtures increase slightly with increasing pressure up to 3000 psi. No maximum <i>cmc</i> with respect to pressure was observed, but this maximum may occur at higher pressures, outside the range of this study. Surface tension as a function of total surfactant concentration, used to determine <i>cmcs</i>, was measured using Axisymmetric Drop Shape Analysis (ADSA) in what is believed to be the first application of this technique to surfactant mixtures at high pressure. This work indicates that ADSA is a powerful tool for determining the surface properties of surfactant solutions at high pressures; it also emphasizes that for the successful application of this technique, greater familiarity with the technique is required, along with more careful selection and design of experimental apparatus, specific attention to image quality, and consideration of physical parameters such as density and drop size that affect the accuracy of the computed results.</p> 1997 English text The Ohio State University / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=osu1302028057 http://rave.ohiolink.edu/etdc/view?acc_num=osu1302028057 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.
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NDLTD
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English
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NDLTD
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| author |
Kust, Paul Roger
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Kust, Paul Roger
Micellar autocatalysis and mixed michelle thermodynamics
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| author_facet |
Kust, Paul Roger
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| author_sort |
Kust, Paul Roger
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| title |
Micellar autocatalysis and mixed michelle thermodynamics
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| title_short |
Micellar autocatalysis and mixed michelle thermodynamics
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| title_full |
Micellar autocatalysis and mixed michelle thermodynamics
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| title_fullStr |
Micellar autocatalysis and mixed michelle thermodynamics
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| title_full_unstemmed |
Micellar autocatalysis and mixed michelle thermodynamics
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| title_sort |
micellar autocatalysis and mixed michelle thermodynamics
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| publisher |
The Ohio State University / OhioLINK
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| publishDate |
1997
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| url |
http://rave.ohiolink.edu/etdc/view?acc_num=osu1302028057
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| work_keys_str_mv |
AT kustpaulroger micellarautocatalysisandmixedmichellethermodynamics
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| _version_ |
1719429817771753472
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