Abstract
The sustained release of pesticides has been widely studied because of the advantages in duration of application, effective utilization, and environmental protection but failed in hydrophobic pesticides. Pickering emulsions that use solid particles as a stabilizer could solve the issues. In the present study, microcrystalline cellulose was pretreated to obtain cellulose solution and further used to load imidacloprid (IM) via the Pickering emulsion route. The resultant products were characterized by FT-IR, TG, XRD, and POM techniques. Results indicated crystal transition from cellulose I to cellulose II in the process of preparing Pickering emulsions. The regenerated cellulose could stabilize the Pickering emulsion with different oil–water volume ratios, and the resultant emulsions could load IM and remain stable for more than 30 days. The loading and encapsulation efficiency values were in the range of 6.50–9.27% and 11.90–13.92%, respectively. Moreover, the IM-loaded emulsions presented a sustained release for more than 120 h along with Fickian diffusion. The simulated release study in saline solutions manifested the effect of electrostatic interaction, and the release study presented a sustained-release performance in water and NaCl solution.
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Acknowledgements
The present work was supported by the Natural Science Foundation of Xinjiang Province, China (NO. 2019D01A54), National Natural Science Foundation of China (NO. 32160352), Xinjiang Key Laboratory of Agricultural Chemistry and Biomaterials, Higher Educational Science and Technology Program of Xinjiang Province, China (NO. XJEDU2019Y021), and Tianshan Talents Program of Xinjiang Province, China (2021−2023).
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Jun Li contributed to conceptualization, methodology, investigation, writing–original draft, and funding acquisition. Mei-mei Cheng was involved in writing—review and editing, methodology, investigation, data curation, and writing—original draft. Cai-xia Yang and Yu-qing Zhang contributed to investigation, data curation, and writing—original draft. De-qiang Li was involved in methodology, validation, formal analysis, writing—original draft, visualization, supervision, and funding acquisition.
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Li, J., Cheng, Mm., Yang, Cx. et al. Regenerated cellulose-stabilized pickering emulsion for sustained release of Imidacloprid. Colloid Polym Sci 300, 1169–1177 (2022). https://doi.org/10.1007/s00396-022-05017-6
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DOI: https://doi.org/10.1007/s00396-022-05017-6