Laser Speckle Rheology for evaluating the viscoelastic properties of hydrogel scaffolds

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Laser Speckle Rheology for evaluating the viscoelastic properties of hydrogel scaffolds

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Title: Laser Speckle Rheology for evaluating the viscoelastic properties of hydrogel scaffolds
Author: Hajjarian, Zeinab; Nia, Hadi Tavakoli; Ahn, Shawn; Grodzinsky, Alan J.; Jain, Rakesh K.; Nadkarni, Seemantini K.

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Citation: Hajjarian, Zeinab, Hadi Tavakoli Nia, Shawn Ahn, Alan J. Grodzinsky, Rakesh K. Jain, and Seemantini K. Nadkarni. 2016. “Laser Speckle Rheology for evaluating the viscoelastic properties of hydrogel scaffolds.” Scientific Reports 6 (1): 37949. doi:10.1038/srep37949. http://dx.doi.org/10.1038/srep37949.
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Abstract: Natural and synthetic hydrogel scaffolds exhibit distinct viscoelastic properties at various length scales and deformation rates. Laser Speckle Rheology (LSR) offers a novel, non-contact optical approach for evaluating the frequency-dependent viscoelastic properties of hydrogels. In LSR, a coherent laser beam illuminates the specimen and a high-speed camera acquires the time-varying speckle images. Cross-correlation analysis of frames returns the speckle intensity autocorrelation function, g2(t), from which the frequency-dependent viscoelastic modulus, G*(ω), is deduced. Here, we establish the capability of LSR for evaluating the viscoelastic properties of hydrogels over a large range of moduli, using conventional mechanical rheometry and atomic force microscopy (AFM)-based indentation as reference-standards. Results demonstrate a strong correlation between |G*(ω)| values measured by LSR and mechanical rheometry (r = 0.95, p < 10−9), and z-test analysis reports that moduli values measured by the two methods are identical (p > 0.08) over a large range (47 Pa – 36 kPa). In addition, |G*(ω)| values measured by LSR correlate well with indentation moduli, E, reported by AFM (r = 0.92, p < 10−7). Further, spatially-resolved moduli measurements in micro-patterned substrates demonstrate that LSR combines the strengths of conventional rheology and micro-indentation in assessing hydrogel viscoelastic properties at multiple frequencies and small length-scales.
Published Version: doi:10.1038/srep37949
Other Sources: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5131361/pdf/
Terms of Use: This article is made available under the terms and conditions applicable to Other Posted Material, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#LAA
Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:29739097
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