LI XueyuAssistant Professor
- Laboratory of Soft & Wet Matter
- Research Theme
- fatigue and fracture mechanism of tough and self-healing hydrogels
- Research Keywords
fatigue and fracture, crack propagation, phase separation, Rheological response, hierarchical structure, tough hydrogels
Overview of Research
(1) Muscles, composed of exquisite hierarchical structures, exhibit high fatigue resistance and can resist crack propagation even after injury. The mechanism of the hierarchical structures on suppressing crack advance under reciprocating movement is poorly understood. Tough and self-healing hydrogels are good candidates as simplified model systems for studying the mechanical behaviors of load-bearing bio-tissues. By tuning the hierarchical structure in tough and self-healing hydrogels (such as polyampholyte hydrogels), we have discovered that the bicontinuous phase networks at the 100-nm scale notably decelerates the crack propagation in tough hydrogel, and clarified the role of hierarchical structure on the multi-level fatigue resistance. Further studies will incorporate muscle-like hierarchical structures in the hydrogels to achieve fatigue-resistant and self-healing under physiological conditions, and explore their applications in emerging fields such as biomedicine, tissue engineering, etc.
(2) Viscoelasticity, derived from noncovalent/reversible interactions in covalent polymer networks, is a phenomenon commonly observed in soft materials, such as elastomers, hydrogels and human tissues. Viscoelastic dissipation associated with the rheological response of these noncovalent/reversible interactions plays an essential role in the toughness enhancement and crack resistance. But its effect on fatigue behavior, particularly the fatigue threshold for vanishing crack advancing velocities, is still an open question. Therefore, we will study the relationship between viscoelastic response and fatigue resistance in tough and self-healing hydrogels.
- School of Science:
Biological Science course (Macromolecular Functions), Core Laboratories
- Graduate School of Life Science:
Division of Soft Matter, Soft Matter Materials Science
X. Li, K. Cui, T. Kurokawa, Y. N. Ye, T. L. Sun, C. Yu, C. Creton, and J. P. Gong. Effect of Mesoscale Phase Contrast on Fatigue-Delaying Behavior of Self-Healing Hydrogels. Sci. Adv., 2021, 7: eabe8210.
Y. N. Ye, K. Cui, W. Hong, X. Li, C. Yu, D. Hourdet, T. Nakajima, T. Kurokawa, and J. P. Gong. Molecular Mechanism of Abnormally Large Non-softening Deformation Tough Hydrogel. Proc. Natl. Acad. Sci.U.S.A., 2021, 118(14): e2014694118.
X. Li, K. Cui, T. L Sun, L. Meng, C. Yu, L. Li, C. Creton, T. Kurokawa, and J. P. Gong. Mesoscale Bicontinuous Networks in Self-Healing Hydrogels Delay Fatigue Fracture. Proc. Natl. Acad. Sci. U.S.A., 2020, 117(14): 7606.
C. Yu, H. Guo, K. Cui, X. Li, Y. N. Ye, T. Kurokawa, and J. P. Gong. Hydrogels as Dynamic Memory with Forgetting Ability. Proc. Natl. Acad.Sci. U.S.A., 2020, 117(32): 18962.
K. Cui, Y. N. Ye, C. Yu, X. Li, T. Kurokawa, and J. P. Gong. Stress Relaxation and Underlying Structure Evolution in Tough and Self-Healing Hydrogels. ACS Macro Lett., 2020, 9(11): 1582.
Refer to HOKKAIDO UNIVERSITY RESEARCHERS DIRECTORY
– Time: Anytime during the lecture period
– Place: Frontier-AMLS, 3F
Please contact in advance by E-mail.
- Faculty of Advanced Life Science, Department of Advanced Transdisciplinary Sciences, Soft & Wet Matter Science
- Frontier Research Center for Advanced Material and Life Science, Global Collaboration Unit, Soft Matter Collaborative Research Unit