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Temperature and CO2 Dual-Responsive Pickering Emulsions Using Jeffamine M2005-Modified Cellulose Nanocrystals
Gaihuan Ren1, Xiaoyang Zheng1, Hui Gu1
1Key Laboratory of Colloid and Interface Chemistry, Ministry of Education , Shandong University , Jinan , Shandong 250100 , P. R. China.
Langmuir : the ACS Journal of Surfaces and Colloids
|September 25, 2019
Summary
Responsive Pickering emulsifiers made from cellulose nanocrystals (CNCs) were developed using a simple modification. These CNCs-M2005 show dual responsiveness to temperature and CO2, enabling tunable emulsion stability for advanced material applications.
Area of Science:
- Materials Science
- Biomaterials Engineering
- Colloid and Surface Chemistry
Background:
- Cellulose nanocrystals (CNCs) are biodegradable and promising for Pickering emulsions.
- High CNC hydrophilicity limits emulsification; existing modifications are complex.
- Developing simpler, responsive CNC-based emulsifiers is needed.
Purpose of the Study:
- To create hydrophobically modified CNCs (CNCs-M2005) with dual responsiveness.
- To investigate the emulsification and demulsification behavior of CNCs-M2005.
- To explore applications in intelligent delivery systems.
Main Methods:
- Hydrophobic modification of CNCs via electrostatic interactions with thermosensitive M2005.
- Preparation and characterization of oil/water Pickering emulsions.
- Investigation of temperature and CO2 triggered demulsification using DLS and TEM.
Main Results:
- CNCs-M2005 exhibited dual temperature and CO2 responsiveness.
- Stable Pickering emulsions were formed at 20 °C and demulsified at 60 °C.
- CO2 bubbling also induced demulsification due to CNCs-M2005 dissociation.
Conclusions:
- Simple modification yields dual-responsive CNCs for Pickering emulsions.
- Tunable emulsion stability achieved via temperature and CO2 stimuli.
- Potential for intelligent food, cosmetic, and drug delivery systems.
