Two-Pronged Approach: Synergistic Tuning of the Surface and Carbon Core to Achieve Yellow Emission in Lignin-Based Carbon Dots

The effect of lignin molecular weight on the formation and properties of carbon quantum dots

“…This may be mainly due to the relaxation of the polar groups (hydroxyl and carboxyl groups) on the surface of L-CQDs in polar solvents such as water and ethanol, resulting in the “giant red-edge effect”; 32 it may also be due to the inhomogeneity of the size of the L-CQDs, which makes different particles having different responses to the excitation light, with a gradual increase in the wavelength. 33 Three-dimensional fluorescence spectroscopy shows that the emission centers of all L-CQDs are near 500 nm, which is consistent with the results of 2D fluorescence spectroscopy analysis. The optimal excitation wavelengths and emission centers of the six L-CQDs are similar, indicating that the molecular weight of lignin carbon precursors has little effect on the optimal excitation wavelengths and emission centers of L-CQDs.…”

Preparation of Lignin-Based Nanoparticles with Excellent Acidic Tolerance as Stabilizer for Pickering Emulsion

“…As a kind of aromatic biopolymer, lignin has a hydrophilic hydroxyl group and hydrophobic benzene ring structure, and it has been employed in various applications such as emulsion stabilizers due to its amphiphilic property [ 18 , 19 ]. Currently, various lignin-based particles with different sizes, e.g., microparticles (1 μm~100 μm) [ 20 ], sub-microparticles (100 nm~1.0 μm) [ 21 ], and nanoparticles (1 nm~100 nm) [ 22 , 23 ], have been developed as effective stabilizers for Pickering emulsions. Compared to colloidally unstable and interpenetrating micro- and larger-sized lignin particles, the lignin nanoparticles (LNPs) display enhanced adsorption ability at the oil–water interface of the emulsions, which are beneficial to the formation of stable and homogeneous Pickering emulsions [ 24 ].…”