Interaction of cellulose nanocrystals with titanium dioxide and peculiarities of hybrid structures formation
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In this work we prepared hybrid particles based on cellulose nanocrystals and titanium dioxide nanoparticles and studied their aggregate stability for a wide range of the components ratios. Electrosurface properties of cellulose nanocrystals and TiO2 greatly influence on morphology and properties of the hybrid particles. Sufficient amount of TiO2 nanoparticles in the hybrid dispersions make it possible to completely cover cellulose nanocrystals surface and form a core-shell structure. Derjaguin–Landau–Verwey–Overbeek theory calculations confirmed experimental data and possibility of TiO2 monolayer covering of cellulose nanocrystals surface. Summarizing the findings, we conclude about the mechanism of interaction between cellulose nanocrystals and titanium dioxide—at the first stage particles are attracted to one another due to long-range electrostatic forces; at the second stage hydrogen bonds are formed. It is found that control of the surface potential allows to obtain stable colloidal hybrid dispersions (having negative-charged or positive-charged particles), or hybrid systems with a neutral surface charge.
KeywordsHybrid particles Cellulose nanocrystals Titanium dioxide Electrostatic interaction DLVO theory Heterocoagulation
This work was supported by the Russian Foundation for Basic Research, grant No 16-33-108; Krivoshapkin P. V. is grateful to a Program of the Ural Branch of the Russian Academy of Sciences No 15-9-3-60. Most of the studies were carried out using the equipment of the Collective Use Center Khimiya, Institute of Chemistry, Komi Scientific Center, Ural Branch, Russian Academy of Sciences.
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Conflict of interest
The authors declare that they have no competing interests.
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