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  4. Control of Dissipation Sources: A Central Aspect for Enhancing the Mechanical and Mechanobiological Performances of Hydrogels
 
research article

Control of Dissipation Sources: A Central Aspect for Enhancing the Mechanical and Mechanobiological Performances of Hydrogels

Nasrollahzadeh, Naser  
•
Karami, Peyman  
•
Pioletti, Dominique P.  
October 30, 2019
ACS Applied Materials & Interfaces

Development of mechanically durable and biologically inductive hydrogels is a major challenge for load-bearing applications such as engineered cartilage. Dissipative capacity of articular cartilage is central to its functional behavior when submitted to loading. While fluid frictional drag is playing a significant role in this phenomenon, the flow-dependent source of dissipation is mostly overlooked in the design of hydrogel scaffolds. Herein, we propose an original strategy based on the combination of fluidic and polymeric dissipation sources to simultaneously enhance hydrogel mechanical and mechanobiological performances. The nondestructive dissipation processes were carefully designed by hybrid cross-linking of the hydrogel network and low permeability of the porous structure. It was found that intrachain and pore water distribution in the porous hydrogels improves the mechanical properties in high water fractions. In contrast to widely reported tough hydrogels presenting limited load support capability at low strain values, we obtained stiff and dissipative hydrogels with unique fatigue behavior. We showed that the fatigue resistance capability is not a function of morphology, dissipation level, and stiffness of the viscoelastic hydrogels but rather depends on the origin of the dissipation. Moreover, the preserved dissipation source under mechanical stimulation maintained a mechanoinductive niche for enhancing chondrogenesis owing to fluid frictional drag contribution. The proposed strategy can be widely used to design functional scaffolds in high loading demands for enduring physiological stimuli and generating regulatory cues to cells.

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Type
research article
DOI
10.1021/acsami.9b15450
Web of Science ID

WOS:000493869700024

Author(s)
Nasrollahzadeh, Naser  
Karami, Peyman  
Pioletti, Dominique P.  
Date Issued

2019-10-30

Published in
ACS Applied Materials & Interfaces
Volume

11

Issue

43

Start page

39662

End page

39671

Subjects

Nanoscience & Nanotechnology

•

Materials Science, Multidisciplinary

•

Science & Technology - Other Topics

•

Materials Science

•

hydrogel

•

sources of dissipation

•

fatigue resistance

•

cartilage

•

mechanobiology

•

strain-dependent permeability

•

double-network hydrogels

•

articular-cartilage

•

interstitial fluid

•

tough hydrogels

•

behavior

•

matrix

•

compression

•

relaxation

•

scaffolds

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LBO  
Available on Infoscience
November 20, 2019
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/163213
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