A Torsion-Based Rheometer for Measuring Viscoelastic Material Properties

Asp, Merrill; Jutzeler, Elise; Kochanowski, Jakub A.; Kerr, Katherine E.; Song, Dawei; Gupta, Sarthak; Carroll, Bobby; Patteson, Alison E.

doi:10.35459/tbp.2020.000172

Cited by 2 publications

(2 citation statements)

References 23 publications

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“…Linear isotropic elastic materials are characterized by three moduli characterizing different deformation modes – the extensional modulus K (addressing extensional properties), the shear modulus G (addressing shearing deformations), and the bulk modulus B (quantifying response to bulk volumetric compression). These elastic moduli depend linearly on Young’s modulus E and are related by Poisson’s ratio ν − that quantifies the compressibility of the material and is, therefore, an important material property for soft gels. While K and G are both measures of the stiffness (or how much the material resists change in shape), ν describes the coupling between axial and transverse deformations.…”

Section: Introductionmentioning

confidence: 99%

Facile Determination of the Poisson’s Ratio and Young’s Modulus of Polyacrylamide Gels and Polydimethylsiloxane

Smith,

Inocencio,

Pardi

et al. 2024

ACS Appl. Polym. Mater.

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Polyacrylamide hydrogels (PAH gel) and polydimethylsiloxane (PDMS, an elastomer) are two soft materials often used in cell mechanics and mechanobiology, in manufacturing lab-on-a-chip applications, among others. This is partly due to the ability to tune their elasticity with ease in addition to various chemical modifications. For affine polymeric networks, two (of three) elastic constants, Young's modulus (E), the shear modulus (G), and Poisson's ratio (ν), describe the purely elastic response to external forces. However, the literature addressing the experimental determination of ν for PAH (sometimes called PAA gels in the literature) and the PDMS elastomer is surprisingly limited when compared to the literature that reports values of the elastic moduli, E and G. Here, we present a facile method to obtain the Poisson's ratio and Young's modulus for PAH gel and PDMS elastomer based on static tensile tests. The value of ν obtained from the deformation of the sample is compared to the value determined by comparing E and G via a second independent method that utilizes small amplitude shear rheology. We show that the Poisson's ratio may vary significantly from the value for incompressible materials (ν = 0.5), often assumed in the literature even for soft compressible hydrogels. Surprisingly, we find a high degree of agreement between elastic constants obtained by shear rheology and macroscopic static tension test data for polyacrylamide hydrogels but not for elastomeric PDMS.

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Section: Introductionmentioning

confidence: 99%

Facile Determination of the Poisson’s Ratio and Young’s Modulus of Polyacrylamide Gels and Polydimethylsiloxane

Smith,

Inocencio,

Pardi

et al. 2024

ACS Appl. Polym. Mater.

View full text Add to dashboard Cite

show abstract

“…Linear isotropic elastic materials are characterized by three moduli characterizing different deformation modes -the extensional modulus K (addressing extensional properties), the shear modulus G (addressing shearing deformations), and the bulk modulus B (quantifying response to bulk volumetric compression). These elastic moduli depend linearly on the Young's modulus E, and are related by the Poisson's ratio 𝜈 [5][6][7][8][9][10][11][12] that quantifies the compressibility of the material and is therefore an important material property for soft gels. While K and G are both measures of the stiffness (or how much the material resists change in shape), 𝜈 describes the coupling between axial and transverse deformations.…”

Section: Introductionmentioning

confidence: 99%

Facile determination of the Poisson’s ratio and Young’s modulus of polyacrylamide gels and polydimethylsiloxane

Smith,

Inocencio,

Pardi

et al. 2023

Preprint

View full text Add to dashboard Cite

Polyacrylamide hydrogels (PAH) and polydimethylsiloxane (PDMS) are two soft materials often used in cell mechanics and mechanobiology, in manufacturing lab-on-a-chip applications, among others. This is partly due to the ability to tune their elasticity with ease, in addition to various chemical modifications. For affine polymeric networks, two (of three) elastic constants ̶ the Young's modulus (E), the shear modulus (G), and the Poisson's ratio (ν) ̶ describe the purely elastic response to external forces. However, the literature addressing the experimental determination of ν for PAH (also sometimes referred to as PAA gels in the literature) and PDMS is surprisingly limited when compared to the literature reporting values of E and G. Here, we present a facile method to obtain the Poison's ratio and Young's modulus for PAH and PDMS based on static tensile tests, and cross-correlate these values with those obtained via a second independent method, shear rheology. We show that: i) the Poisson's ratio may vary significantly from the value for incompressible materials (ν = 0.5), and ii) find a high degree of agreement between shear rheology and macroscopic static tension tests for PAH but not PDMS.

show abstract

A Torsion-Based Rheometer for Measuring Viscoelastic Material Properties

Cited by 2 publications

References 23 publications

Facile Determination of the Poisson’s Ratio and Young’s Modulus of Polyacrylamide Gels and Polydimethylsiloxane

Facile Determination of the Poisson’s Ratio and Young’s Modulus of Polyacrylamide Gels and Polydimethylsiloxane

Facile determination of the Poisson’s ratio and Young’s modulus of polyacrylamide gels and polydimethylsiloxane

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