The DOI matches its Crossref record; 27 of the 27 references it cites were found in a registry or an index.
Simple, Reversible Emulsion System Switched by pH on the Basis of Chitosan without Any Hydrophobic Modification
Abstract
Chitosan without hydrophobic modification is not a good emulsifier itself. However, it has a pH-tunable sol-gel transition due to free amino groups along its backbone. In the present work, a simple reversible Pickering emulsion system based on the pH-tunable sol-gel transition of chitosan was developed. At pH > 6.0, as adjusted by NaOH, chitosan was insoluble in water. Chitosan nanoparticles or micrometer-sized floccular precipitates were formed in situ. These chitosan aggregates could adsorb at the interface of oil and water to stabilize the o/w emulsions, so-called Pickering emulsions. At pH < 6.0, as adjusted by HCl, chitosan was soluble in water. Demulsification happened. Four organic solvents (liquid paraffin, n-hexane, toluene, and dichloromethane) were chosen as the oil phase. Reversible emulsions were formed for all four oils. Chitosan-based Pickering emulsions could undergo five cycles of emulsification-demulsification with only a slight increase in the emulsion droplet size. They also had good long-term stability for more than 2 months. Herein, we give an example of chitosan without any hydrophobic modification to act as an effective emulsifier for various oil-water systems. From the results, we have determined that natural polymers with a stimulus-responsive sol-gel transition should be a good particulate emulsifier. The method for in situ formation of pH-responsive Pickering emulsions based on chitosan will open up a new route to the preparation of a wide range of reversible emulsions.
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Metadata
- Authors
- Liu, H., Wang, C., Zou, S., Wei, Z., & Tong, Z.
- Venue
- Langmuir
- Publisher
- American Chemical Society (ACS)
- Published
- 2012-07-17
- Volume
- 28
- Issue
- 30
- Pages
- 11017-11024
- ISSN
- 0743-7463 (ISSN-L)
- 1520-5827
- OpenAlex
- W2329357680
- Cited by
- 284
- References
- 27
- FWCI
- 6.23
- Type
- journal article
- Language
- en
- Open access
- closed
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