Abstract
The self-assembly pattern of functionalized chitosan (CS), in various solvent mixtures, was discussed here. The previously synthesized amphiphilic thiobarbiturate-derived chitosan (CS-TBA) molecule (where the chitosan backbone was relatively more hydrophobic and the thiobarbiturate moiety was relatively more hydrophilic) was subjected to different solvent mixtures for this purpose. Then the morphological changes of the aggregates were studied and analyzed from the perspective of size and shape through various conventional techniques. One of the components of the solvent mixture was water, whereas another component was a different polar protic solvent i.e.; methanol and polar aprotic solvents such as tetrahydrofuran, acetonitrile and dioxane. The superstructures were characterized using field emission scanning electron microscope (FESEM), transmission electron microscope (TEM), cryo transmission electron microscope (cryo-TEM) and differential light scattering (DLS) methodologies. Finally, the usability of the solvent-dependent morphologies was deliberated in this article. Through the detailed spectroscopic analysis, we observed various unique and magnificent morphologies in terms of size and shapes in different solvent mixtures (protic as well as aprotic and different in terms of polarity index). The astonishing superstructures also have fascinating dye encapsulation abilities (above 80% encapsulation for hydrophobic as well as a hydrophilic dye in case of methanol/water solvent mixture) in different solvent mixtures which could be applied in the field of self-assembly and dye removal industries.
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Acknowledgements
P. M. thanks UGC-RGNF SC for the fellowship and funding, and M. M. thanks DSKPDF for the fellowship and funding. R. S. thanks IISER KOLKATA for infrastructure and funding.
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Mandal, P., Mukherjee, M. & Shunmugam, R. Effect of the aqueous-organic solvent mixtures upon super-aggregation of chitosan. J Polym Res 30, 26 (2023). https://doi.org/10.1007/s10965-022-03404-9
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DOI: https://doi.org/10.1007/s10965-022-03404-9