Synthesis of polymeric Janus nanoparticles by co-precipitation in a rotating packed bed to stabilize carvacrol encapsulated Pickering emulsions

doi:10.1016/j.cjche.2025.04.017

Chinese Journal of Chemical Engineering ›› 2025, Vol. 85 ›› Issue (9): 7-15.DOI: 10.1016/j.cjche.2025.04.017

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Synthesis of polymeric Janus nanoparticles by co-precipitation in a rotating packed bed to stabilize carvacrol encapsulated Pickering emulsions

Senlin Li^1,2,3, Yifan Zheng^1,2,3, Fen Wang^1,2, Xiang Wang¹, Zhihao Zhang³, Yuan Pu², Dan Wang^1,2

1. State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China;
2. Research Center of the Ministry of Education for High Gravity Engineering and Technology, Beijing University of Chemical Technology, Beijing 100029, China;
3. Quzhou Innovation Institute for Chemical Engineering and Materials, Quzhou 324000, China

Received:2024-12-23 Revised:2025-03-27 Accepted:2025-04-14 Online:2025-05-30 Published:2025-09-28
Contact: Yuan Pu,E-mail:puyuan@mail.buct.edu.cn;Dan Wang,E-mail:wangdan@mail.buct.edu.cn
Supported by:
The authors are grateful for financial support from the National Natural Science Foundation of China (22278027), the Beijing Natural Science Foundation (2232013).

Synthesis of polymeric Janus nanoparticles by co-precipitation in a rotating packed bed to stabilize carvacrol encapsulated Pickering emulsions

Senlin Li^1,2,3, Yifan Zheng^1,2,3, Fen Wang^1,2, Xiang Wang¹, Zhihao Zhang³, Yuan Pu², Dan Wang^1,2

1. State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China;
2. Research Center of the Ministry of Education for High Gravity Engineering and Technology, Beijing University of Chemical Technology, Beijing 100029, China;
3. Quzhou Innovation Institute for Chemical Engineering and Materials, Quzhou 324000, China

通讯作者: Yuan Pu,E-mail:puyuan@mail.buct.edu.cn;Dan Wang,E-mail:wangdan@mail.buct.edu.cn
基金资助:
The authors are grateful for financial support from the National Natural Science Foundation of China (22278027), the Beijing Natural Science Foundation (2232013).

Abstract

Abstract: Practical application of carvacrol in different fields including foods and biopesticides has been limited due to its instability and water insolubility. In this work, carvacrol encapsulated Pickering emulsion is developed by using polymeric Janus nanoparticles as the stabilizer. To achieve this, dumbbell-shaped polymeric nanoparticles composed of two spheres of shellac and polylactic acid (PLA) are firstly prepared via co-precipitation in a rotating packed bed reactor, followed by grafting of chitooligosaccharides (COS) onto shellac to synthesis amphiphilic Janus nanoparticles (PLA/shellac-COS). Pickering emulsions with typical oil-in-water, bi-continuous structure and water-in-oil characteristics are produced by configuring carvacrol emulsions with different oil-to-water ratios. The stability of emulsions with 5% carvacrol content stabilized by 0.5% PLA/shellac-COS nanoparticles were more stable when compared to those prepared by shellac nanoparticles and PLA/shellac nanoparticles. After stored for one month, the carvacrol encapsulated Pickering emulsions maintained a high zeta potential of -43.8 mV, with no significant changes in particle size. These preliminary studies illustrated that polymeric Janus nanoparticles synthesized by co-precipitation in a rotating packed bed are promising particles for Pickering emulsions and related work in the future.

Key words: Chemical reactors, Nanoparticles, Janus nanoparticles, Carvacrol, Emulsions

摘要： Practical application of carvacrol in different fields including foods and biopesticides has been limited due to its instability and water insolubility. In this work, carvacrol encapsulated Pickering emulsion is developed by using polymeric Janus nanoparticles as the stabilizer. To achieve this, dumbbell-shaped polymeric nanoparticles composed of two spheres of shellac and polylactic acid (PLA) are firstly prepared via co-precipitation in a rotating packed bed reactor, followed by grafting of chitooligosaccharides (COS) onto shellac to synthesis amphiphilic Janus nanoparticles (PLA/shellac-COS). Pickering emulsions with typical oil-in-water, bi-continuous structure and water-in-oil characteristics are produced by configuring carvacrol emulsions with different oil-to-water ratios. The stability of emulsions with 5% carvacrol content stabilized by 0.5% PLA/shellac-COS nanoparticles were more stable when compared to those prepared by shellac nanoparticles and PLA/shellac nanoparticles. After stored for one month, the carvacrol encapsulated Pickering emulsions maintained a high zeta potential of -43.8 mV, with no significant changes in particle size. These preliminary studies illustrated that polymeric Janus nanoparticles synthesized by co-precipitation in a rotating packed bed are promising particles for Pickering emulsions and related work in the future.

关键词: Chemical reactors, Nanoparticles, Janus nanoparticles, Carvacrol, Emulsions

Senlin Li, Yifan Zheng, Fen Wang, Xiang Wang, Zhihao Zhang, Yuan Pu, Dan Wang. Synthesis of polymeric Janus nanoparticles by co-precipitation in a rotating packed bed to stabilize carvacrol encapsulated Pickering emulsions[J]. Chinese Journal of Chemical Engineering, 2025, 85(9): 7-15.

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Synthesis of polymeric Janus nanoparticles by co-precipitation in a rotating packed bed to stabilize carvacrol encapsulated Pickering emulsions

Synthesis of polymeric Janus nanoparticles by co-precipitation in a rotating packed bed to stabilize carvacrol encapsulated Pickering emulsions

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