Cavity growth in a triblock copolymer polymer gel

Delbos, Aline; Cui, Jun; Fakhouri, Sami; Crosby, Alfred J.

doi:10.1039/c2sm25458a

Cited by 24 publications

(29 citation statements)

References 17 publications

(27 reference statements)

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“…The details of CR experiments have been given previously. [1][2][3][4][5][6][7][8][9]11,21 Essentially, a needle is embedded within a soft solid. This is followed by pressurization of the fluid within the needle that leads to the growth and eventual rapid, unstable expansion of a bubble at the tip of the needle (Fig.…”

Section: Cavitation Rheology: Boundary and Loading Conditionsmentioning

confidence: 99%

“…In experiments, the pressurizing fluid has been either air or water [1][2][3][4][5][6][7][8]11 and in both cases unstable expansion at a critical pressure P c is observed. Because the fluid reservoir has an inherent stiffness, k, associated with it (due to rubber o-rings and pressure sensors), we approximate the system as shown in Fig.…”

Section: Cavitation Rheology: Boundary and Loading Conditionsmentioning

confidence: 99%

“…Rapid, 3-D mechanical characterization of soft solids provides information necessary for the elucidation of health-related mechanisms, e.g., mechanotransduction in cells and tissue property evolution during onset of disease. A recently explored technique referred to as cavitation rheology (CR) [1][2][3][4][5][6][7][8][9][10] or the maximum bubble pressure (MBP) 11 method provides a promising avenue for quickly and inexpensively obtaining this data, especially in soft-solids whose properties can be otherwise difficult to measure using traditional techniques. Past CR measurements in a variety of synthetic, polymeric materials at a range of length scales have been found to correlate with elastic modulus.…”

mentioning

confidence: 99%

“…Past CR measurements in a variety of synthetic, polymeric materials at a range of length scales have been found to correlate with elastic modulus. 1,2,4,7,11 These measurements arise from an instability governed mechanism that causes the sudden, rapid, and temporarily unstable expansion of a pressurized void at the tip of an embedded needle ( Fig. 1).…”

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confidence: 99%

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Elastic cavitation and fracture via injection

2016

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The cavitation rheology technique extracts soft materials mechanical properties through pressure-monitored fluid injection. Properties are calculated from the system's response at a critical pressure that is governed by either elasticity or fracture (or both); however previous elementary analysis has not been capable of accurately determining which mechanism is dominant. We combine analyses of both mechanisms in order to determine how the full system thermodynamics, including far-field compliance, dictate whether a bubble in an elastomeric solid will grow through either reversible or irreversible deformations. Applying these analyses to experimental data, we demonstrate the sensitivity of cavitation rheology to microstructural variation via a co-dependence between modulus and fracture energy.

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Section: Cavitation Rheology: Boundary and Loading Conditionsmentioning

confidence: 99%

Section: Cavitation Rheology: Boundary and Loading Conditionsmentioning

confidence: 99%

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confidence: 99%

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Elastic cavitation and fracture via injection

2016

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“…The first is that because the analysis assumes a neo-Hookean strain energy function, cavitation rheometry has only been used to characterize materials that are elastic solids. 11,12,[16][17][18][19] To extend this method to viscoelastic materials, the assumption of neo-Hookean mechanics must be examined relative to their rheological behavior. The second limitation is that Eqs.…”

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Elasticity of microscale volumes of viscoelastic soft matter by cavitation rheometry

et al. 2014

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Measurement of the elastic modulus of soft, viscoelastic liquids with cavitation rheometry is demonstrated for specimens as small as 1 ll by application of elasticity theory and experiments on semi-dilute polymer solutions. Cavitation rheometry is the extraction of the elastic modulus of a material, E, by measuring the pressure necessary to create a cavity within it [J. A. Zimberlin, N. Sanabria-DeLong, G. N. Tew, and A. J. Crosby, Soft Matter 3, 763-767 (2007)]. This paper extends cavitation rheometry in three ways. First, we show that viscoelastic samples can be approximated with the neo-Hookean model provided that the time scale of the cavity formation is measured. Second, we extend the cavitation rheometry method to accommodate cases in which the sample size is no longer large relative to the cavity dimension. Finally, we implement cavitation rheometry to show that the theory accurately measures the elastic modulus of viscoelastic samples with volumes ranging from 4 ml to as low as 1 ll. V C 2014 AIP Publishing LLC.[http://dx.doi.org/10.1063/1.4896108]The linear elastic modulus of a soft material is a mechanical property measurable by techniques such as mechanical rheometry, microrheology, and atomic force microscopy (AFM). 1,2 Needs for both in vivo characterization of linear elasticity (such as in tissue viability) as well as rapid measurement (such as in quality control applications) have driven recent methods development. [3][4][5] Mechanical rheometry typically requires approximately milliliter sample volumes and, if sample loading and testing durations are considered, requires as much as 5 min to test one specimen at one deformation frequency. Passive microrheology is a widely used technique to study the mechanical properties of small volumes (between $3 and 50 ll) of soft matter. One method of microrheology-which uses the multiple scattering technique of diffusing wave spectroscopy-requires as much as an hour of measurement time. This method can probe elastic moduli up to $2000 Pa. 1,6,7 Microrheology measurements can also be impacted by the stability of the dispersed probes and the heterogeneity of the material studied. 8,9 AFM can also be used to characterize the elastic modulus of very small volumes (<1 ll) of material; however, this technique requires long durations for measurements and sample preparation time. 3,10 The duration of these techniques makes them challenging for high throughput applications, while their lack of portability complicates their use as in vivo diagnostics.The cavitation rheometry technique of Zimberlin et al. characterizes the linear elastic modulus of soft matter with Young's modulus in the range of 0.12 kPa < E < 40 kPa. 11,12 It is an inexpensive, fast, and portable method that estimates the elastic modulus by measurement of the critical pressure (P c ) required for internal cavitation. Cavitation is induced by air pumped through a needle inserted into the sample. The critical pressure predicts the elastic modulus, E, through the theory of cavitation in an incompressib...

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