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. 2020 Apr 28;117(17):9157-9165.
doi: 10.1073/pnas.1920168117. Epub 2020 Apr 14.

Cavitation in soft matter

Affiliations

Cavitation in soft matter

Christopher W Barney et al. Proc Natl Acad Sci U S A. .

Abstract

Cavitation is the sudden, unstable expansion of a void or bubble within a liquid or solid subjected to a negative hydrostatic stress. Cavitation rheology is a field emerging from the development of a suite of materials characterization, damage quantification, and therapeutic techniques that exploit the physical principles of cavitation. Cavitation rheology is inherently complex and broad in scope with wide-ranging applications in the biology, chemistry, materials, and mechanics communities. This perspective aims to drive collaboration among these communities and guide discussion by defining a common core of high-priority goals while highlighting emerging opportunities in the field of cavitation rheology. A brief overview of the mechanics and dynamics of cavitation in soft matter is presented. This overview is followed by a discussion of the overarching goals of cavitation rheology and an overview of common experimental techniques. The larger unmet needs and challenges of cavitation in soft matter are then presented alongside specific opportunities for researchers from different disciplines to contribute to the field.

Keywords: TBI; bubble; rheology; soft solids; traumatic brain injury.

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Conflict of interest statement

The authors declare no competing interest.

Figures

Fig. 1.
Fig. 1.
(A) Example of cavitation in the wake of an artificial heart valve. Reprinted by permission from ref. (Copyright 1999, Springer Nature: Annals of Biomedical Engineering,). (B) Example of cavitation in knuckles as they crack. Reprinted from ref. , which is licensed under CC BY 4.0. (C) Example of cavitation in a synthetic silicone on laser ablation. (D) Schematic of a spherical void of initial radius r in a gel that experiences an unstable snap from a low stretch state to a high stretch state at a critical pressure. (E) Pressure–expansion curves for voids with varying ratios of interfacial energy to elastic modulus. (F) Critical pressure against size scale for a hydrogel with a modulus similar to those reported for biological tissues.
Fig. 2.
Fig. 2.
Schematic and image of cavity formation in (A) NIC, (B) LIC, and (C) AIC. Reprinted by permission from ref. (Copyright 2003, Springer Nature: Doklady Physics).
Fig. 3.
Fig. 3.
Plot of strain rate against shear modulus for NIC, LIC, SIC, and CIC values from the literature. AIC was omitted from the plot due to difficulties in estimating a strain rate for measurements. NIC strain rates were taken as those associated with the properties extracted from the measurement and are thus much lower than values associated with the expansion stage. Bands for strain rates of common blast or impact activities are overlaid on the data (, , , , , , , , , , , , , , , , , , , , , –104).
Fig. 4.
Fig. 4.
Graphic representation of exclusive and overlapping opportunities for further research in the mechanics, biology, and chemistry communities.

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