One-Step Digital Light Processing 3D Printing of Robust, Conductive, Shape-Memory Hydrogel for Customizing
Hanqiang Zhang1, Peiren Wang1, Heng Zhang2
1Key Laboratory of MEMS of the Ministry of Education, Southeast University, Nanjing 210096, China.
ACS Applied Materials & Interfaces
|November 30, 2024
Summary
Researchers developed a 3D printable hydrogel using a one-step method. This robust, conductive hydrogel offers advanced mechanical properties for next-generation flexible electronic devices.
Area of Science:
- Materials Science
- Polymer Chemistry
- Soft Robotics
Background:
- Mechanically robust and electrically conductive hydrogels are crucial for flexible devices.
- Conventional fabrication methods struggle with complex geometries and customized functionalities.
Purpose of the Study:
- To develop a 3D printable hydrogel with excellent mechanical properties and electrical conductivity.
- To implement a facile one-step preparation strategy for complex hydrogel structures.
Main Methods:
- Utilized vat polymerization 3D printing technology.
- Employed a hybrid double-network mechanism with in situ chemical and physical dual cross-linking.
- Formulated hydrogel with covalently cross-linked poly(acrylamide-co-acrylic acid) and chitosan, and physically cross-linked zirconium ions.
Main Results:
- Achieved enhanced mechanical properties: 680% stretchability, 15.1 MJ/m³ toughness, 7.30 MPa tensile strength.
- Demonstrated rapid printing speed (0.7-3 s/100 μm) and high transparency (91%).
- Exhibited favorable ionic conductivity (0.75 S/m), large strain gauge factor (≥7), and fast solvent transfer induced phase separation.
Conclusions:
- The 3D printable multifunctional hydrogel enables high-performance flexible wearable sensors, shape memory actuators, and soft pneumatic robotics.
- This novel hydrogel provides a pathway for customizing intelligent soft devices.
