Abstract
The aim of this thesis work was to study phase diagrams, microstructure and phase separation in alkylglucoside systems. Both alkyl glucoside/water systems and microemulsions with alkyl glucosides have been studied.
The phase diagram of the ternary n -nonyl-beta-glucoside (C<sub>9</sub>G<sub>1</sub>)/ n -decyl-beta-glucoside (C<sub>10</sub>G<sub>1</sub>)/water system has been determined and is discussed in relation to the binary C<sub>9</sub>G<sub>1</sub>/water and C<sub>10</sub>G<sub>1</sub>/water phase diagrams. The evolution of the microstructure has been determined by means of NMR diffusometry along dilution lines through the micellar region of the ternary phase diagram. It was found that the phase separation, observed in the dilute C<sub>10</sub>G<sub>1</sub> rich region of the C<sub>9</sub>G<sub>1</sub>/C<sub>10</sub>G<sub>1</sub>/water phase diagram, is due to differences in the networks in different regions of the phase diagram. Networks rich in C<sub>9</sub>G<sub>1</sub> are more likely to undergo scissions and breaks apart more easily, whereas the network rich in C<sub>10</sub>G<sub>1</sub> are less likely to have scissions and thus deal with dilution stress by separation into two phases. The phase behavior in the water/ n -octane/ n -octyl-beta-glucoside (C<sub>8</sub>G<sub>1</sub>)/1-octanol system together with the four ternary phase diagrams of the system have been studied. The tuning parameter for curvature in the quaternary alkyl glucoside microemulsion systems is not the overall 1-octanol content but the volume fraction of 1-octanol in the amphiphilic film. The types of microstructures formed along the trajectory of the middle-phase have been examined by NMR diffusometry. The diffusion measurements provide clear evidence of the transition from oil-in-water to water-in-oil microemulsions via bicontinuous structures in a remarkably large range around phase inversion. A novel phase separation into two coexisting concentrated micellar solutions has been discovered in the ternary water/C<sub>8</sub>G<sub>1</sub>/ n -octane system.
Finally, further evidence for the presence of branched micelles in the alkyl glucoside/water systems is presented from NMR diffusometry applied to n -octane as a probe in the C<sub>8</sub>G<sub>1</sub>/water system.
The phase diagram of the ternary n -nonyl-beta-glucoside (C<sub>9</sub>G<sub>1</sub>)/ n -decyl-beta-glucoside (C<sub>10</sub>G<sub>1</sub>)/water system has been determined and is discussed in relation to the binary C<sub>9</sub>G<sub>1</sub>/water and C<sub>10</sub>G<sub>1</sub>/water phase diagrams. The evolution of the microstructure has been determined by means of NMR diffusometry along dilution lines through the micellar region of the ternary phase diagram. It was found that the phase separation, observed in the dilute C<sub>10</sub>G<sub>1</sub> rich region of the C<sub>9</sub>G<sub>1</sub>/C<sub>10</sub>G<sub>1</sub>/water phase diagram, is due to differences in the networks in different regions of the phase diagram. Networks rich in C<sub>9</sub>G<sub>1</sub> are more likely to undergo scissions and breaks apart more easily, whereas the network rich in C<sub>10</sub>G<sub>1</sub> are less likely to have scissions and thus deal with dilution stress by separation into two phases. The phase behavior in the water/ n -octane/ n -octyl-beta-glucoside (C<sub>8</sub>G<sub>1</sub>)/1-octanol system together with the four ternary phase diagrams of the system have been studied. The tuning parameter for curvature in the quaternary alkyl glucoside microemulsion systems is not the overall 1-octanol content but the volume fraction of 1-octanol in the amphiphilic film. The types of microstructures formed along the trajectory of the middle-phase have been examined by NMR diffusometry. The diffusion measurements provide clear evidence of the transition from oil-in-water to water-in-oil microemulsions via bicontinuous structures in a remarkably large range around phase inversion. A novel phase separation into two coexisting concentrated micellar solutions has been discovered in the ternary water/C<sub>8</sub>G<sub>1</sub>/ n -octane system.
Finally, further evidence for the presence of branched micelles in the alkyl glucoside/water systems is presented from NMR diffusometry applied to n -octane as a probe in the C<sub>8</sub>G<sub>1</sub>/water system.
| Original language | English |
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| Qualification | Doctor |
| Awarding Institution |
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| Supervisors/Advisors |
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| Award date | 2003 Nov 28 |
| Publisher | |
| ISBN (Print) | 91-7422-036-5 |
| Publication status | Published - 2003 |
Bibliographical note
Defence detailsDate: 2003-11-28
Time: 10:15
Place: Hörsal B, Kemicentrum Sölvegatan 39, Lund
External reviewer(s)
Name: Kronberg, Bengt
Title: Prof.
Affiliation: Ytkemiska Institutet, Stockholm
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Article: I. Phase Separation and Aggregate-Aggregate Interactions in the C9G1/C10G1 beta-Alkyl Glucosides Water System. A Phase Diagram and NMR Self- Diffusion StudyF. Nilsson, O. Söderman and J. Reimer.Langmuir 1998, 14, 6396.
Article: II. Surfactant Diffusion Through Bicontinuous Micellar Networks: A Case Study of the C9G1/C10G1/H2O Mixed Surfactant SystemC. Whiddon, J. Reimer and O. SödermanSubmitted to Langmuir
Article: III. The Water/Octyl-β-D-Glucoside/n-Octane/1-Octanol/ system. Phase Diagrams and Phase properties.J. Reimer, M. Nilsson, M. Álvares and O. SödermanManuscript
Article: IV. General Patterns of the Phase Behavior of Mixtures of H2O, Alkanes, Alkyl Glucosides, and CosurfactantsT. Sottmann, K. Kluge, R. Strey, J. Reimer and O. SödermanLangmuir 2002, 18, 3058.
Article: V. Microstructure of Alkyl Glucoside Microemulsions: Control of Curvature byInterfacial CompositionJ. Reimer, O. Söderman, T. Sottmann, K. Kluge and R. StreyAccepted for publication in Langmuir
Subject classification (UKÄ)
- Physical Chemistry (including Surface- and Colloid Chemistry)
Free keywords
- Fysikalisk kemi
- Physical chemistry
- micellar network
- NMR diffusometry
- microemulsion
- microstructure
- phase diagram
- phase separation
- phase behaviour
- alkyl glucoside
- sugar surfactant