Halloysite nanotubes as natural containers for freezing-induced loading
Halloysites are natural clay nanotubes that are often employed as containers for functional nanoparticles in various applications including drug delivery, catalysis, and thermal energy storage. Therefore, the development of an effective way of nanoparticle loading into the halloysite is of interest to the diversity of fields. Recently, the freezing-induced loading method was shown as an effective approach for the loading of nanoparticles and macromolecules into porous mineral matrices. In this work, the freezing-induced loading of Au nanoparticles into halloysite nanotubes was studied by UV-VIS spectroscopy and transmission electron microscopy. The loading efficiency was compared to this of vacuum impregnation and adsorption from solution. The freezing-induced loading was found to be the most effective with the loading efficiency up to 85% after 5 loading cycles and the best Au nanoparticle distribution into halloysite tubes.
D. Voronin acknowledges the support of RFBR, project number 19-33-60016. K. Cherednichenko and V. Vinokurov acknowledge the support of the Ministry of Science and Higher Education of the Russian Federation in the framework of the state task in the field of scientific activity; subject number FSZE-2020-0007 (0768- 2020-0007).
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Dr. Denis Voronin
National University of Oil and Gas «Gubkin University»
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