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Structural Viscosity Induced by Depletion Effect in Stable Vesicle Dispersion.
Asami Miyajima1, Ryo Inoue1, Erika Onishi1
1Research & Development Headquarters, LION Corporation.
Journal of Oleo Science
|August 16, 2019
Summary
Stable colloidal dispersions were created using triethanolamine-based esterquat (TEQ) vesicles and specific dextrin derivatives (SDD). This structural viscosity prevents particle separation, enhancing usability in various applications.
Area of Science:
- Colloid and Surface Science
- Materials Science
- Rheology
Background:
- Structural viscosity in colloidal dispersions is crucial for preventing particle separation and improving usability.
- Previous studies focused on particle separation, with limited success in constructing and controlling stable dispersion states.
Purpose of the Study:
- To produce stable dispersions using the depletion effect in mixtures of triethanolamine-based esterquat (TEQ) vesicles and specific dextrin derivatives (SDD).
- To investigate the factors influencing structural viscosity and cohesive energy in these mixed dispersions.
Main Methods:
- Formulation of mixtures containing TEQ vesicles and SDD (a non-adsorptive polymer).
- Rheological measurements to assess viscosity and structural viscosity.
- Analysis of depletion flocculation and its effect on dispersion stability, referencing Asakura-Oosawa (AO) theory.
Main Results:
- Stable dispersions were achieved in specific composition regions (8-16% TEQ vesicles, ≤1.2% SDD), exhibiting viscosity proportional to particle concentration.
- Structural viscosity was observed and found to be influenced by TEQ and SDD concentrations, and SDD size.
- Observed effects were consistent with the depletion effect described by the Asakura-Oosawa (AO) theory.
Conclusions:
- Stable dispersions of TEQ vesicles and SDD were successfully produced, induced by the depletion effect.
- Structural viscosity in these mixed dispersions arises from aggregated TEQ vesicle networks caused by depletion flocculation.
- The findings offer a method for controlling stable dispersion states in colloidal systems.
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