Extracting the surface tension of soft gels from elastocapillary wave behavior

Soft Matter
X ShaoJoshua B Bostwick

Abstract

Mechanically-excited waves appear as surface patterns on soft agarose gels. We experimentally quantify the dispersion relationship for these waves over a range of shear modulus in the transition zone where the surface energy (capillarity) is comparable to the elastic energy of the solid. Rayleigh waves and capillary-gravity waves are recovered as limiting cases. Gravitational forces appear as a pre-stress through the self-weight of the gel and are important. We show the experimental data fits well to a proposed dispersion relationship which differs from that typically used in studies of capillary to elastic wave crossover. We use this combined theoretical and experimental analysis to develop a new technique for measuring the surface tension of soft materials, which has been historically difficult to measure directly.

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Citations

Dec 13, 2018·Soft Matter·Justin D BermanKatharine E Jensen
Oct 28, 2019·Soft Matter·S I Tamim, J B Bostwick
Nov 27, 2019·Proceedings of the National Academy of Sciences of the United States of America·Joël TchoufagKranthi K Mandadapu
May 4, 2020·The Journal of the Acoustical Society of America·X ShaoJ B Bostwick
Nov 26, 2019·Physical Review Letters·X ShaoJ B Bostwick
Apr 16, 2020·Physical Review. E·P ChantelotA Eddi
Oct 20, 2020·Proceedings. Mathematical, Physical, and Engineering Sciences·Giulia BevilacquaPasquale Ciarletta
Jan 21, 2021·Physical Review. E·X ShaoJ B Bostwick
Nov 20, 2020·Proceedings of the National Academy of Sciences of the United States of America·Maxime LanoyClaire Prada
Apr 22, 2021·Soft Matter·S I Tamim, J B Bostwick
Nov 4, 2021·NPJ Microgravity·Saiful I Tamim, Joshua B Bostwick

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