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Temperature and CO2 Dual-Responsive Pickering Emulsions Using Jeffamine M2005-Modified Cellulose Nanocrystals
journal contribution
posted on 2019-10-10, 02:29 authored by Gaihuan Ren, Xiaoyang Zheng, Hui Gu, Wenwen Di, Zengzi Wang, Yanlin Guo, Zhenghe Xu, Dejun SunCellulose
nanocrystals (CNCs) with excellent biodegradability are
promising biomaterials for use as responsive Pickering emulsifiers.
However, the high hydrophilicity of CNCs limits their emulsification
ability. Some existing studies have utilized complicated covalent
modification procedures to increase the hydrophobicity of CNCs. To
simplify the modification process, we prepared hydrophobically modified
CNCs (CNCs-M2005) via simple and controllable electrostatic interactions
with thermosensitive M2005. The obtained CNCs-M2005 exhibited temperature
and CO2 dual-responsive properties. Subsequently, stable
oil/water Pickering emulsions were prepared using the partially hydrophobic
CNCs-M2005 at 20 °C. However, demulsification occurred when the
temperature increased to 60 °C. This temperature-induced demulsification
resulted from the dehydration of polyethylene oxide and polypropylene
oxide, causing the aggregation of the CNCs-M2005, as shown by dynamic
light scattering and transmission electron microscopy experiments.
In addition, demulsification was also achieved after bubbling CO2, which was attributed to the dissociation of the partially
hydrophobic CNCs-M2005. The temperature and CO2 dual-responsive
biosafe Pickering emulsions open up opportunity for the design of
intelligent food, cosmetic, and drug delivery systems.
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CO 2 dual-responsive propertiesCO 2 Dual-Responsive Pickering EmulsionsJeffamine M 2005-Modified Cellulose Nanocrystals Cellulose nanocrystalsthermosensitive M 2005.CNCs-M 2005covalent modification proceduresdemulsificationtransmission electron microscopy experimentsCO 2 dual-responsive biosafe Pickering emulsionsoxidedrug delivery systems
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