Crossover behavior in stress relaxations of poroelastic and viscoelastic dominant hydrogels

doi:10.1039/d3sm00592e

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	Crossover behavior in stress relaxations of poroelastic and viscoelastic dominant hydrogels
	李航宇连欣怡 ; Guan DS(关东石)
发表期刊	SOFT MATTER
	2023-06-19
ISSN	1744-683X
摘要	The mechanical response and relaxation behavior of hydrogels are crucial to their diverse functions and applications. However, understanding how stress relaxation depends on the material properties of hydrogels and accurately modeling relaxation behavior at multiple time scales remains a challenge for soft matter mechanics and soft material design. While a crossover phenomenon in stress relaxation has been observed in hydrogels, living cells, and tissues, little is known about how the crossover behavior and characteristic crossover time depend on material properties. In this study, we conducted systematic atomic-force-microscopy (AFM) measurements of stress relaxation in agarose hydrogels with varying types, indentation depths, and concentrations. Our findings show that the stress relaxation of these hydrogels features a crossover from short-time poroelastic relaxation to long-time power-law viscoelastic relaxation at the micron scale. The crossover time for a poroelastic-dominant hydrogel is determined by the length scale of the contact and diffusion coefficient of the solvent inside the gel network. In contrast, for a viscoelastic-dominant hydrogel, the crossover time is closely related to the shortest relaxation time of the disordered network. We also compared the stress relaxation and crossover behavior of hydrogels with those of living cells and tissues. Our experimental results provide insights into the dependence of crossover time on poroelastic and viscoelastic properties and demonstrate that hydrogels can serve as model systems for studying a wide range of mechanical behaviors and emergent properties in biomaterials, living cells, and tissues.
DOI	10.1039/d3sm00592e
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:001017991200001
WOS研究方向	Chemistry, Physical ; Materials Science, Multidisciplinary ; Physics, Multidisciplinary ; Polymer Science
项目资助者	National Key Ramp ; D Program of China [2021YFA0719302] ; NSFC [11972351]
论文分区	二类
力学所作者排名	1
RpAuthor	Guan, DS (corresponding author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China. ; Guan, DS (corresponding author), Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China.
引用统计
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/92434
专题	非线性力学国家重点实验室
作者单位	1.{Li Hangyu, Lian Xinyi, Guan Dongshi} Chinese Acad Sci Inst Mech State Key Lab Nonlinear Mech Beijing 100190 Peoples R China 2.{Li Hangyu, Lian Xinyi, Guan Dongshi} Univ Chinese Acad Sci Sch Engn Sci Beijing 100049 Peoples R China
推荐引用方式 GB/T 7714	李航宇连欣怡,Guan DS. Crossover behavior in stress relaxations of poroelastic and viscoelastic dominant hydrogels[J]. SOFT MATTER,2023.
APA	李航宇连欣怡,&关东石.(2023).Crossover behavior in stress relaxations of poroelastic and viscoelastic dominant hydrogels.SOFT MATTER.
MLA	李航宇连欣怡,et al."Crossover behavior in stress relaxations of poroelastic and viscoelastic dominant hydrogels".SOFT MATTER (2023).

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