Bowtie-shaped deformation isotherm of superhydrophobic cylindrical mesopores
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In: Langmuir, Vol. 38.2022, No. 1, 11.01.2022, p. 211-220.
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TY - JOUR
T1 - Bowtie-shaped deformation isotherm of superhydrophobic cylindrical mesopores
AU - Michel, Loic
AU - Ludescher, Lukas
AU - Cristiglio, Viviana
AU - Charlaix, Elisabeth
AU - Paris, Oskar
AU - Picard, Cyril
N1 - Publisher Copyright: © 2021 American Chemical Society.
PY - 2022/1/11
Y1 - 2022/1/11
N2 - Deformation of superhydrophobic cylindrical mesopores is studied during a cycle of forced water filling and spontaneous drying by in situ small-angle neutron scattering. A high-pressure setup is put forward to characterize the deformation of ordered mesoporous silanized silica up to 80 MPa. Strain isotherms of individual pores are deduced from the shift of the Bragg spectrum associated with the deformation of the hexagonal pore lattice. Due to their superhydrophobic nature, pore walls are not covered with a prewetting film. This peculiarity gives the ability to use a simple mechanical model to describe both filled and empty pore states without the pitfall of disjoining pressure effects. By fitting our experimental data with this model, we measure both the Young's modulus and the Poisson ratio of the nanometric silica wall. The measurement of this latter parameter constitutes a specificity offered by superhydrophobic nanopores with respect to hydrophilic ones.
AB - Deformation of superhydrophobic cylindrical mesopores is studied during a cycle of forced water filling and spontaneous drying by in situ small-angle neutron scattering. A high-pressure setup is put forward to characterize the deformation of ordered mesoporous silanized silica up to 80 MPa. Strain isotherms of individual pores are deduced from the shift of the Bragg spectrum associated with the deformation of the hexagonal pore lattice. Due to their superhydrophobic nature, pore walls are not covered with a prewetting film. This peculiarity gives the ability to use a simple mechanical model to describe both filled and empty pore states without the pitfall of disjoining pressure effects. By fitting our experimental data with this model, we measure both the Young's modulus and the Poisson ratio of the nanometric silica wall. The measurement of this latter parameter constitutes a specificity offered by superhydrophobic nanopores with respect to hydrophilic ones.
UR - http://www.scopus.com/inward/record.url?scp=85122820953&partnerID=8YFLogxK
U2 - 10.1021/acs.langmuir.1c02427
DO - 10.1021/acs.langmuir.1c02427
M3 - Article
VL - 38.2022
SP - 211
EP - 220
JO - Langmuir
JF - Langmuir
SN - 0743-7463
IS - 1
ER -
