Abstract
We describe a method for the fabrication of acoustic metasurfaces, which is based on soft porous polymer materials. The materials are obtained using an emulsion templating technique, which allows for the fabrication of soft porous polymers with fully controlled porosity values between 0 and 30%. Our approach involves the polymerization of water-in-silicone emulsions with controlled water volume fractions. The obtained wet solid monolith samples are dried using three different methods. Due to the softness of the polymer matrix, and like in polyHIPE hydrogels or silica aerogels, the first method—regular air drying—leads to a collapse of the material and we present a complete experimental study of the observed kinetics as well as a model to account for the observed results. We show that this model can catch the kinetics characteristics. Then, using two alternative drying techniques, H2O2-assisted and supercritical drying, we show that it is possible to obtain materials with fully controlled porosities. The speed of sound—or equivalently the material acoustic index—inside the material being dependent on its porosity, we obtain a gradient-index acoustic material by spatially controlling the porosity distribution along the two dimensions of these metasurfaces. Their ability in terms of wavefront shaping is then demonstrated through a deflecting experiment performed in water with a sample having a thickness five times smaller than the incident acoustic wavelength at ultrasonic frequencies.
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References
Y. Xu, Y. Fu, H. Chen, Planar gradient metamaterials. Nat. Rev. Mater. 1(12), 16067 (2016)
B. Assouar, B. Liang, Y. Wu, Y. Li, J.C. Cheng, Y. Jing, Acoustic metasurfaces. Nat. Rev. Mater. 3, 460–472 (2018)
Y. Xie, W. Wang, H. Chen, A. Konneker, B.I. Popa, S.A. Cummer, Wavefront modulation and subwavelength diffractive acoustics with an acoustic metasurface. Nat. Commun. 5, 5553 (2014)
Y. Li, G. Yu, B. Liang, X. Zou, G. Li, S. Cheng, J. Cheng, Three-dimensional ultrathin planar lenses by acoustic metamaterials. Sci. Rep. 4, 6830 (2014)
B. Xie, K. Tang, H. Cheng, Z. Liu, S. Chen, J. Tian, Coding acoustic metasurfaces. Adv. Mater. 29, 1603507 (2017)
H. Tang, Z. Chen, N. Tang, S. Li, Y. Shen, Y. Peng, X. Zhu, J. Zang, Hollow-out patterning ultrathin acoustic metasurfaces for multifunctionalities using soft fiber/rigid bead networks. Adv. Funct. Mater. 28(36), 1801127 (2018)
X. Su, A.N. Norris, C.W. Cushing, M.R. Haberman, P.S. Wilson, Broadband focusing of underwater sound using a transparent pentamode lens. J. Acoust. Soc. Am. 141(6), 4408–4417 (2017)
D.C. Calvo, A.L. Thangawng, M. Nicholas, C.N. Layman, Thin Fresnel zone plate lenses for focusing underwater sound. Appl. Phys. Lett. 107(1), 014103 (2015)
Y. Jin, R. Kumar, O. Poncelet, O. Mondain-Monval, T. Brunet, Flat acoustics with soft gradient-index metasurfaces. Nat. Commun. 10, 143 (2019)
A. Kovalenko, K. Zimny, B. Mascaro, T. Brunet, O. Mondain-Monval, Tailoring of the porous structure of soft emulsion-templated polymer materials. Soft Matter 12, 5154–5163 (2016)
A. Bisson, A. Rigacci, D. Lecomte, E. Rodier, P. Achard, Drying of silica gels to obtain aerogels: phenomenology and basic techniques. Drying Technol. 21(4), 593–628 (2003)
Y. Lumelsky, M.S. Silverstein, Biodegradable porous polymers through emulsion templating. Macromolecules 42(5), 1627–1623 (2009)
T.D. Wheeler, A.D. Stroock, The transpiration of water at negative pressures in a synthetic tree. Nature 455(7210), 208–212 (2008)
M.S. Silverstein, PolyHIPEs: recent advances in emulsion-templated porous polymers. Prog. Polym. Sci. 39(1), 199–234 (2014)
I. Pulko, P. Krajnc, High internal phase emulsion templating—a path to hierarchically porous functional polymers. Macromol. Rapid Commun. 33(20), 1731–1746 (2012)
K. Zimny, A. Merlin, A. Ba, C. Aristégui, T. Brunet, O. Mondain-Monval, Soft porous silicone rubbers as key elements for the realization of acoustic metamaterials. Langmuir 31, 3215–3221 (2015)
A. Kovalenko, M. Fauquignon, T. Brunet, O. Mondain-Monval, Tuning the sound speed in macroporous polymers with a hard or soft matrix. Soft Matter 13, 4526–4532 (2017)
M.P. Milner, L. Jin, S.B. Hutchens, Creasing in evaporation-driven cavity collapse. Soft Matter 13, 6894 (2017)
L. Daubersies, J.B. Salmon, Evaporation of solutions and colloidal dispersions in confined droplets. Phys. Rev. E 84, 031406 (2011)
B. Dollet, J.F. Louf, M. Alonzo, K.H. Jensen, P. Marmottant, Drying of channels by evaporation through a permeable medium. J. R. Soc. Interface 16(151), 20180690 (2019)
A. Della Martina, J.G. Hilborn, J. Kiefer, J.L. Hedrick, S. Srinivasan, R.D. Miller, in Siloxane elastomer foams, ed. by K.C. Khemani. Polymeric Foams: Science and Technology, ACS Symposium Series Ch. 2, 8–25, vol 669 (American Chemical Society, Washington DC, 1997)
S.E. Bae, J.S. Son, K. Park, D.K. Han, Fabrication of covered porous PLGA microspheres using hydrogen peroxide for controlled drug delivery and regenerative medicine. J. Control. Release 133(1), 37–43 (2009)
A. Ba, A. Kovalenko, C. Aristégui, O. Mondain-Monval, T. Brunet, Soft porous silicone rubbers with ultra-low sound speeds in acoustic metamaterials. Sci. Rep. 7, 40106 (2017)
G. Kuster, M. Toksöz, Velocity and attenuation of seismic waves in two-phase: Part I. Theoretical formulations. Geophysics 39(5), 587–606 (1974)
Acknowledgements
We thank Frédéric Marchal and Tania Ireland from Elkem Company for fruitful discussions and for providing us with silicone rubber. Special thanks to Marco Faustini and Philippe Barois for fruitful suggestions and discussions. Special thanks to Marie-Anne Dourges, from Institut des Sciences Moléculaires – CNRS – Univ. of Bordeaux, for her help on BET analysis. This work was partially funded and performed within the framework of the Labex AMADEUS ANR-10-LABEX-0042-AMADEUS with the help of the French state Initiative d’Excellence IdEx ANR-10-IDEX-003-02 and project BRENNUS ANR-15-CE08-0024.
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Kumar, R., Jin, Y., Marre, S. et al. Drying kinetics and acoustic properties of soft porous polymer materials. J Porous Mater 28, 249–259 (2021). https://doi.org/10.1007/s10934-020-00987-w
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DOI: https://doi.org/10.1007/s10934-020-00987-w