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Release of Solubilizate from Micelle Triggered by Core Freezing
KTH, School of Chemical Science and Engineering (CHE).
2016 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesisAlternative title
Frisläppning av Inkapslade Molekyler från Miceller vid Kärnfrysning (Swedish)
Abstract [en]

The present thesis focuses on the release of solubilizate from micelle triggered by core freezing studied using 1H-NMR spectroscopy. The surfactant studied was the nonionic BrijTM S20 with a concentration of 1 wt% in water and hexamethyldisiloxane (HMDSO) was used as the model solubilizate to be loaded in micelle. The solubilizate in the micelle was found be squeezed out by core shrinking of the micelle upon decreasing the temperature. Besides 1H-NMR spectra, self-diffusion coefficients and longitudinal relaxation times                          were also measured upon decreasing the temperature. The temperature-dependent fraction of HMDSO in the micelle was determined together with relevant properties of the micelle, such as core freezing point, internal dynamics and size. The results were compared to corresponding data in the neat micellar system.

Abstract [sv]

I denna avhandling har frisläppningen av hexametyldisiloxan (HMDSO) från micellära system som initierats via kärnfrysning studerats med hjälp av 1H-NMR spektroskopi. Den studerade surfaktanten, den nonjoniska BrijTM S20 bildar miceller vid 1 vikt% i vatten. Den underliggande mekanismen för frisläppning härrör ifrån att micellens kärna fryser vid sänkt temperatur. Förutom de uppmätta 1H-NMR spektra så mätts även temperatur beroendet av självdiffusionkoefficienter och longitudinella relaxationstider                         . Den temperaturberoende andelen av HMDSO i micellen bestämdes tillsammans med relevanta egenskaper hos micellen, såsom temperatur för kärnfrysning, interna dynamik och storlek. Dessa jämfördes med motsvarande data från systemet utan HMDSO.

Place, publisher, year, edition, pages
2016.
Keywords [en]
Core freezing, Nonionic surfactants, BrijTMS20, Hexamethyldisiloxane, NMR spectroscopy, Diffusion coefficient, Longitudinal relaxation time (T_1), Solubility
Keywords [sv]
Kärn infrysning, Nonjoniska surfaktanter, BrijTMS20, Hexametyldisiloxan, NMR spektroskopi, Självdiffusionkoeffiecient, Longitudinell relaxationstid, Löslighet
National Category
Physical Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-207369OAI: oai:DiVA.org:kth-207369DiVA, id: diva2:1096867
Available from: 2017-05-19 Created: 2017-05-19 Last updated: 2017-05-19Bibliographically approved

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