Please use this identifier to cite or link to this item:
|Title:||Probing mechanical properties of fully hydrated gels and biological tissues||Authors:||Constantinides, Georgios
Kalcioglua, Z. Ilke
Smithc, James F.
Vliet, Krystyn J. Van
|Keywords:||Mechanical properties;Indentation;Hydrated tissues;Elasticity;Hydrogels||Issue Date:||2008||Publisher:||Elsevier||Source:||Journal of biomechanics, Vol. 41, no. 15, 2008, pp. 3285-3289||Abstract:||A longstanding challenge in accurate mechanical characterization of engineered and biological tissues is maintenance of both stable sample hydration and high instrument signal resolution. Here, we describe the modification of an instrumented indenter to accommodate nanomechanical characterization of biological and synthetic tissues in liquid media, and demonstrate accurate acquisition of force–displacement data that can be used to extract viscoelastoplastic properties of hydrated gels and tissues. We demonstrate the validity of this approach via elastoplastic analysis of relatively stiff, water-insensitive materials of elastic moduli E>1000kPa (borosilicate glass and polypropylene), and then consider the viscoelastic response and representative mechanical properties of compliant, synthetic polymer hydrogels (polyacrylamide-based hydrogels of varying mol%-bis crosslinker) and biological tissues (porcine skin and liver) of E<500kPa. Indentation responses obtained via loading/unloading hystereses and contact creep loading were highly repeatable, and the inferred E were in good agreement with available macroscopic data for all samples. As expected, increased chemical crosslinking of polyacrylamide increased stiffness (E40kPa) and decreased creep compliance. E of porcine liver (760kPa) and skin (222kPa) were also within the range of macroscopic measurements reported for a limited subset of species and disease states. These data show that instrumented indentation of fully immersed samples can be reliably applied for materials spanning several orders of magnitude in stiffness (E=kPa–GPa). These capabilities are particularly important to materials design and characterization of macromolecules, cells, explanted tissues, and synthetic extracellular matrices as a function of spatial position, degree of hydration, or hydrolytic/enzymatic/corrosion reaction times.||URI:||http://ktisis.cut.ac.cy/handle/10488/237||ISSN:||0021-9290||DOI:||http://dx.doi.org/10.1016/j.jbiomech.2008.08.015||Rights:||© 2008 Elsevier||Type:||Article|
|Appears in Collections:||Άρθρα/Articles|
Show full item record
checked on Feb 13, 2018
checked on Dec 16, 2018
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.