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Hu J, Chi M, He R, Fan J, Gao H, Xie W, Dai K, Sun S, Hu S. Multi-responsive Pickering emulsifiers: a comprehensive study on the emulsification-demulsification behavior of modified chitosan-coated Fe 3O 4 nanocomposites. Phys Chem Chem Phys 2024; 26:20009-20021. [PMID: 39005229 DOI: 10.1039/d4cp01018c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/16/2024]
Abstract
The surface characteristics of stimuli-responsive Pickering emulsifiers can be modified by external environmental triggers, making them highly versatile in various applications. In this study, we report three novel organic-inorganic composite structure emulsifiers. These emulsifiers were designed with a core of magnetic Fe3O4 particles, surrounded by a protective silica layer, and coated on the exterior with three distinct types of modified chitosan (CS). Experimental results demonstrate that these emulsifiers can stabilize emulsion systems consisting of liquid paraffin and deionized water at a concentration of 0.5 wt%. The unique properties of the modified CS coatings allowed for the controlled demulsification of two types of emulsions by adjusting the proton concentration. Additionally, these emulsifiers exhibited magnetic-responsive demulsification under the control of an external magnetic field. The findings of this study provide valuable insights into the design and construction of multi-responsive chitosan-based magnetic Pickering emulsifiers with controllable properties.
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Affiliation(s)
- Jianwen Hu
- School of Materials Science and Engineering, China University of Petroleum (East China), Qingdao, 266580, P. R. China.
- Institute of Advanced Materials, China University of Petroleum (East China), Qingdao, 266580, P. R. China
| | - Mingshuo Chi
- School of Materials Science and Engineering, China University of Petroleum (East China), Qingdao, 266580, P. R. China.
- Institute of Advanced Materials, China University of Petroleum (East China), Qingdao, 266580, P. R. China
| | - Runna He
- School of Materials Science and Engineering, China University of Petroleum (East China), Qingdao, 266580, P. R. China.
- Institute of Advanced Materials, China University of Petroleum (East China), Qingdao, 266580, P. R. China
| | - Junjie Fan
- School of Materials Science and Engineering, China University of Petroleum (East China), Qingdao, 266580, P. R. China.
- Institute of Advanced Materials, China University of Petroleum (East China), Qingdao, 266580, P. R. China
| | - Haotian Gao
- School of Materials Science and Engineering, China University of Petroleum (East China), Qingdao, 266580, P. R. China.
- Institute of Advanced Materials, China University of Petroleum (East China), Qingdao, 266580, P. R. China
| | - Wenqing Xie
- School of Materials Science and Engineering, China University of Petroleum (East China), Qingdao, 266580, P. R. China.
- Institute of Advanced Materials, China University of Petroleum (East China), Qingdao, 266580, P. R. China
| | - Kunxiu Dai
- School of Petroleum Engineering, Southwest Petroleum University, Chengdu, 610500, P. R. China
| | - Shuangqing Sun
- School of Materials Science and Engineering, China University of Petroleum (East China), Qingdao, 266580, P. R. China.
- Institute of Advanced Materials, China University of Petroleum (East China), Qingdao, 266580, P. R. China
| | - Songqing Hu
- School of Materials Science and Engineering, China University of Petroleum (East China), Qingdao, 266580, P. R. China.
- Institute of Advanced Materials, China University of Petroleum (East China), Qingdao, 266580, P. R. China
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Cunningham MF, Jessop PG. CO 2-Switchable colloids. Chem Commun (Camb) 2023; 59:13272-13288. [PMID: 37872815 DOI: 10.1039/d3cc03929c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2023]
Abstract
The development and design of CO2-switchable colloidal particles is described. A presentation of the principles of CO2 switching, especially as they apply to colloids, is followed by recent progress in the preparation of several types of colloidal particles (polymer nanoparticles, metal-organic frameworks (MOFs), quantum dots, graphene, cellulose nanocrystals, carbon nanotubes) for various applications (Pickering stabilizers, catalysts, latexes), and our perspective on future opportunities.
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Affiliation(s)
- Michael F Cunningham
- Queen's University, Department of Chemical Engineering, 19 Division Street, Kingston, ON, Canada.
| | - Philip G Jessop
- Queen's University, Department of Chemistry, 90 Bader Lane, Kingston, ON, Canada
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Zhao H, Yang Y, Chen Y, Li J, Wang L, Li C. A review of multiple Pickering emulsions: Solid stabilization, preparation, particle effect, and application. Chem Eng Sci 2022. [DOI: 10.1016/j.ces.2021.117085] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Ren D, Shang Z, Zhang M, Xu S, Xu Z. The effect of chitosan molecular weight on CO 2-triggered switching between emulsification and demulsification. SOFT MATTER 2021; 17:9332-9338. [PMID: 34596649 DOI: 10.1039/d1sm01036k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
The role of molecular weight as a key physical property of macromolecules in determining the CO2-triggered switching characteristics of responsive emulsions prepared using CO2-switchable macromolecules has not been studied and is the focus of the current study. In this work, CO2-switchable chitosan of four different molecular weights is used to investigate the effect of molecular weight on CO2-triggered switching of CO2-responsive emulsions. The molecular weight of chitosan is shown to have an opposite effect on emulsification and demulsification by the CO2 trigger. Before bubbling of CO2, chitosan of higher molecular weight forms a more stable three-dimensional network structure in the continuous phase of oil-in-water (O/W) emulsions, which leads to the formation of a more stable emulsion. After bubbling of CO2, the chitosan of higher molecular weight makes the continuous phase more viscous, which leads to an incomplete demulsification as compared with the chitosan of lower molecular weight. Experimental evidence from the measurement of conductivity, interfacial tension and rheological properties is provided to support the proposed mechanism. This work is of great significance in guiding the selection of desirable CO2-switchable polymers for switchable emulsions of desired switching characteristics.
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Affiliation(s)
- Dongyin Ren
- College of Textile and Clothing, Dezhou University, Dezhou, 253023, P. R. China
| | - Zhixin Shang
- College of Textile and Clothing, Dezhou University, Dezhou, 253023, P. R. China
| | - Mei Zhang
- College of Textile and Clothing, Dezhou University, Dezhou, 253023, P. R. China
| | - Shengming Xu
- Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, P. R. China
| | - Zhenghe Xu
- Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, P. R. China
- Shenzhen Key Laboratory of Interfacial Science and Engineering of Materials, Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China.
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