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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Citations
Cites
Particles as surfactants—similarities and differences
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Colloidosomes: Selectively Permeable Capsules Composed of Colloidal Particles
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Graphene Oxide Sheets at Interfaces
Kim, J., Cote, L. J., Kim, F., Yuan, W., Shull, K. R., & Huang, J. (2010) · Journal of the American Chemical Society · doi:10.1021/ja102777p · Cited by 1,762
Pickering Emulsions Stabilized by Monodisperse Latex Particles: Effects of Particle Size
Binks, B. P., & Lumsdon, S. O. (2001) · Langmuir · doi:10.1021/la0103822 · Cited by 814
New Pickering Emulsions Stabilized by Bacterial Cellulose Nanocrystals
Kalashnikova, I., Bizot, H., Cathala, B., & Capron, I. (2011) · Langmuir · doi:10.1021/la200971f · Cited by 789
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Pickering Emulsions: Interfacial Tension, Colloidal Layer Morphology, and Trapped-Particle Motion
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Cited by
Pickering stabilization of foams and emulsions with particles of biological origin
Lam, S., Velikov, K. P., & Velev, O. D. (2014) · Current Opinion in Colloid & Interface Science · doi:10.1016/j.cocis.2014.07.003 · Cited by 493
Tang, J., Lee, M. F. X., Zhang, W., Zhao, B., Berry, R. M., & Tam, K. C. (2014) · Biomacromolecules · doi:10.1021/bm500663w · Cited by 309
Polysaccharide nanoparticles: from fabrication to applications
Plucinski, A., Lyu, Z., & Schmidt, B. V. K. J. (2021) · Journal of Materials Chemistry B · doi:10.1039/d1tb00628b · Cited by 308
Chitosan: Gels and Interfacial Properties
Nilsen-Nygaard, J., Strand, S., Vårum, K., Draget, K., & Nordgård, C. (2015) · Polymers · doi:10.3390/polym7030552 · Cited by 306
Hu, Y.-Q., Yin, S.-W., Zhu, J.-H., Qi, J.-R., Guo, J., Wu, L.-Y., Tang, C.-H., & Yang, X.-Q. (2016) · Food Hydrocolloids · doi:10.1016/j.foodhyd.2016.05.028 · Cited by 305
Effect of chemicals on the phase and viscosity behavior of water in oil emulsions
Shafiei, M., Kazemzadeh, Y., Martyushev, D. A., Dai, Z., & Riazi, M. (2023) · Scientific Reports · doi:10.1038/s41598-023-31379-0 · Cited by 104
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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