期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 42, 页码 48084-48092出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c11781
关键词
self-healing; chitosan; interfacial rheology; capsule; pickering emulsion; AFM
资金
- Australian Research Council (ARC)
- University of Melbourne
- Mondelez Australia through Industrial Transformation Research Hub (ITRH) [IH120100053]
- Robert Bage Scholarship
- ETH Zurich [ETH-1914-1]
The time-dependent behavior of surface-active adsorption layers at the oil/water interface can dictate emulsion behavior at both the micro- and macroscale. In addition, self-healing behavior of the adsorption layer may benefit emulsion stability subject to large deformation under processing or during final application. We explore the behavior of chitosan, a known hydrophilic emulsifier, which forms nanoparticle aggregates when the concentration of acetate buffer exceeds 0.3 M. We observe a Pickering adsorption layer building and strain-dependent behavior of the chitosan at the medium chain triglyceride oil/water interface. We compare this to the behavior of identical chitosan layers coated on oil droplets via atomic force microscopy colloidal probe compression in both linear and oscillatory compressions. In both interfacial shear rheometry and the capsule compression, a thick, elastic layer with strong time-dependent recovery behavior is observed, suggesting that the layer has some self-healing capabilities.
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