Particulate Coatings via Evaporation-Induced Self-Assembly of Polydisperse Colloidal Lignin on Solid Interfaces

O Cusola and S Kivisto and S Vierros and P Batys and M Ago and BL Tardy and LG Greca and MB Roncero and M Sammalkorpi and OJ Rojas, LANGMUIR, 34, 5759-5771 (2018).

DOI: 10.1021/acs.langmuir.8b00650

Polydisperse smooth and spherical biocolloidal particles were suspended in aqueous media and allowed to consolidate via evaporation-induced self-assembly. The stratification of the particles at the solid-air interface was markedly influenced, but not monotonically, by the drying rate. Cross-sectional imaging via electron microscopy indicated a structured coating morphology that was distinctive from that obtained by using particles with a mono- or bimodal distribution. Segregation patterns were found to derive from the interplay of particle diffusion, interparticle forces, and settling dynamics. Supporting our experimental findings, computer simulations showed an optimal drying rate for achieving maximum segregation. Overall, stratified coatings comprising nano- and microparticles derived from lignin are expected to open opportunities tor multifunctional structures that can be designed and predicted on the basis of experimental Peclet numbers and computational order.

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