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    Acetone/Water Cosolvent Approach to Lignin Nanoparticles with Controllable Size and Their Applications for Pickering Emulsions

    Year: 2021

    Journal: ACS Sustain. Chem. Eng., Volume 9, APR 19, page 5470–5480

    Authors: Li, Xiang; Shen, Jiajun; Wang, Bijia; Feng, Xueling; Mao, Zhiping; Sui, Xiaofeng

    Organizations: Donghua University [CUSF-DH-D-2020058]; Fundamental Research Funds for the Central Universities [2232020G-04]; Fundamental Research Funds for the Central Universities

    Keywords: lignin nanoparticles; controllable preparation; acetone/water cosolvent; Pickering emulsion

    In this study, we showed that lignin nanoparticles (LNPs) with controllable size could be prepared using the acetone/water cosolvent (A/W) approach. The solubility of lignin in A/W of varied constitution (10:0 to 0:10 v/v) was determined, and A/W containing 7:3 (v/v) acetone to water was identified as the optimum solvent. A positive correlation between LNP size and lignin concentration was observed, with the smallest LNPs (28.5 +/- 5.4 nm) obtained at 5.00 g/L of lignin, while serious aggregation occurred at lignin concentrations above 100 g/L. The rotary evaporation procedure used to remove acetone had no noticeable effect on the size of LNPs. The obtained LNPs were utilized as emulsifiers to stabilize oil-in-water Pickering emulsions of various oils. The results indicated that the high efficiency of LNPs in stabilizing Pickering emulsions was due to their irreversible adsorption at the oil-water interface of the droplets. Overall, a straightforward way for the controllable preparation of LNPs and their use as Pickering emulsifiers was demonstrated.
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