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Transmission electron microscopy (TEM) images of the samples obtained from the dispersions at different water contents at an initial lignin concentration of 0.5 g/L. Water content: (A) 0 vol %, (B) 20 vol %, (C) 40 vol %, (D) 50 vol %, (E) >80 vol %, after removing tetrahydrofuran (THF). (F) Schematic representation of the lignin hollow nanosphere’s formation process in THF/H2O. Reprinted with permission from Xiong et al. [51]. Copyright 2017 American Chemical Society.
