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Smart-Responsive Colloidal Capsules as an Emerging Tool to Design a Multifunctional Lubricant Additive
Sang T Pham1, A Kiet Tieu1, Vitor Sencadas1
1School of Mechanical, Materials, Mechatronic and Biomedical Engineering, University of Wollongong, Wollongong, New South Wales 2522, Australia.
ACS Applied Materials & Interfaces
|February 3, 2021
Summary
This study introduces smart-responsive colloidal capsules for lubricants, overcoming microcapsule breakage issues. These capsules significantly enhance lubricity and achieve ultra-low friction under extreme conditions.
Area of Science:
- Materials Science
- Tribology
- Colloid Science
Background:
- Microencapsulation offers controlled release but faces shell breakage in lubricants under stress.
- Shell fragments negatively impact friction and wear, hindering tribological applications.
- Existing microencapsulation methods are limited in lubricant research due to poor stability.
Purpose of the Study:
- To develop a novel microencapsulation strategy for lubricant additives.
- To overcome the challenge of microcapsule shell breakage under severe shearing conditions.
- To create a multifunctional additive with enhanced lubricity and tribological properties.
Main Methods:
- Development of smart-responsive colloidal capsules with tailored shell properties.
- Focus on shell-lubricant interaction and synergistic effects of incorporated materials.
- Testing the additive's performance in conventional melt lubricants under hot metal working conditions.
Main Results:
- Achieved a ~70% improvement in lubricity for conventional melt lubricants.
- Demonstrated an unprecedented ~93% oxidation-reduction capability.
- Reported the first instance of ultra-low friction (0.07) at 880 °C.
Conclusions:
- The developed smart colloidal capsules offer a viable solution to microencapsulation limitations in tribology.
- This approach enables the creation of multifunctional lubricant additives with superior performance.
- Opens new possibilities for customizing additive packages in lubrication science through smart capsules.
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