Related Experiment Video
Updated: Oct 18, 2025
07:04
Synthesis of Strong Adhesive Hydrogel, Gelatin O-Nitrosobenzaldehyde
Published on: November 11, 2022
2.7K
An extremely tough and ionic conductive natural-polymer-based double network hydrogel.
Xingyue Sun1, Yongzhi Liang1, Lina Ye2
1CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modern Mechanics, University of Science and Technology of China, Hefei, Anhui 230026, China. hyliang@ustc.edu.cn.
Journal of Materials Chemistry. B
|September 29, 2021
Summary
Researchers developed a novel double network (DN) hydrogel using only natural polymers, gellan gum and gelatin. This breakthrough offers enhanced mechanical properties and conductivity for advanced applications.
Area of Science:
- Materials Science
- Biomaterials Engineering
Background:
- Hydrogels are crucial in drug delivery, tissue regeneration, soft robotics, and flexible electronics.
- Existing double network (DN) hydrogels from synthetic polymers show superior mechanical properties compared to natural polymer-based ones, limiting their applications.
Purpose of the Study:
- To develop a novel double network (DN) hydrogel using only natural polymers with enhanced mechanical properties and conductivity.
- To explore a new pathway for strengthening natural-polymer-based DN hydrogels.
Main Methods:
- Preparation of a virgin gellan gum/gelatin composite hydrogel.
- Soaking the composite hydrogel in a mixed solution of sodium sulfate (Na2SO4) and ammonium sulfate ((NH4)2SO4) to form the DN structure.
Main Results:
- The novel natural-polymer-based DN hydrogel exhibited tunable Young's modulus (0.08–42.6 MPa), good fracture stress (0.05–7.5 MPa), and high fracture toughness (up to 27.7 kJ m-2).
- The hydrogel achieved high ionic conductivity (up to 11.4 S m-1 at f = 1 kHz).
- Mechanical property enhancement is attributed to sulfate ions creating chain-entanglement crosslinks in gelatin and sodium ions forming electrostatic interactions in gellan gum.
Conclusions:
- A new method for creating robust and conductive natural-polymer-based DN hydrogels was successfully demonstrated.
- The developed gellan gum/gelatin DN hydrogel shows significant potential for applications in biomedical engineering and flexible electronic devices.
