期刊
SOFT MATTER
卷 12, 期 9, 页码 2537-2541出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5sm02820e
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资金
- Research Grants Council of the Hong Kong Special Administration Region [HKU 7143/12E, HKU 7147/13E]
- University of Hong Kong [201311159128]
- National Natural Science Foundation of China [11321202]
- National Institutes of Health [NIH-R01EB017753, NIH-U01CA202177, NIH-U54CA193417]
- National Science Foundation [NSF-CMMI131239]
In this study, we examine how the physical properties of cross-linking molecules affect the bulk response of bio-filament networks, an outstanding question in the study of biological gels and the cytoskeleton. We show that the stress-strain relationship of such networks typically undergoes linear increase - strain hardening - stress serration - total fracture transitions due to the interplay between the bending and stretching of individual filaments and the deformation and breakage of cross-linkers. Interestingly, the apparent network modulus is found to scale with the linear and rotational stiffness of the crosslinks to a power exponent of 0.78 and 0.13, respectively. In addition, the network fracture energy will reach its minimum at intermediate rotational compliance values, reflecting the fact that most of the strain energy will be stored in the distorted filaments with rigid cross-linkers while the imposed deformation will be evenly'' distributed among significantly more crosslinking molecules with high rotational compliance.
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