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Rheology of graphene oxide stabilized Pickering emulsions
Shu-Ming Cui1,2, Saud Hashmi3, Wen-Qiang Li1
1College of Materials Science and Engineering, Shenzhen Key Laboratory of Polymer Science and Technology, Guangdong Research Center for Interfacial Engineering of Functional Materials, Nanshan District Key Laboratory for Biopolymers and Safety Evaluation, Shenzhen University, Shenzhen 518055, P. R. China. yanfeihuang@szu.edu.cn.
Graphene oxide (GO) and didodecyldimethylammonium bromide (DDAB) stabilize Pickering emulgels for 3D printing. Their structure and interfacial jamming behavior were elucidated using microscopy, dielectric spectroscopy, and rheology.
Area of Science:
- Materials Science
- Colloid and Surface Chemistry
Background:
- Pickering emulgels are versatile systems with applications in advanced materials.
- Graphene oxide (GO) and surfactants like didodecyldimethylammonium bromide (DDAB) are key components in stabilizing emulgels.
- Understanding the structure-property relationships is crucial for optimizing their performance, especially in 3D printing.
Purpose of the Study:
- To elucidate the structure of Pickering emulgels stabilized by GO and DDAB.
- To investigate the interfacial jamming behavior of these emulgels under varying conditions.
- To correlate structural properties with rheological behavior for 3D printing applications.
Main Methods:
- Microscopy (before and after shear) for structural analysis.
- Broadband dielectric spectroscopy to probe interfacial dynamics.
- Rheology (linear and nonlinear regimes) to characterize mechanical properties.
- Analysis of normal forces during shear.
Main Results:
- Increased DDAB and GO content systematically enhanced modulus and viscosity.
- Higher concentrations reduced the limits of the nonlinear rheological regime.
- Complex normal force variations were observed, including negative forces at low GO content and positive at high GO content.
- Interfacial jamming was explained by droplet deformation, jamming, and recovery dynamics.
Conclusions:
- The study provides a comprehensive understanding of Pickering emulgel structure and interfacial jamming.
- The findings offer insights into optimizing emulgel formulations for 3D printing inks.
- The interplay between GO, DDAB, and oil phase dictates the rheological properties and printability.
