Cavitation on Deterministically Nanostructured Surfaces in Contact with an Aqueous Phase: A Small-Angle Neutron Scattering Study

Melnichenko, Yuri B.; Bahadur, J.; Szekely, N. K.; Kravchenko, I. I.; He, L.; Lavrik, N. V.; Pipich, V.; Popov, E.; Smith, G.

doi:10.1021/la500963q

Journal Article

FZJ-2014-05396

Cavitation on Deterministically Nanostructured Surfaces in Contact with an Aqueous Phase: A Small-Angle Neutron Scattering Study

Melnichenko, Y. B. (Corresponding Author) ; Lavrik, N. V. ; Popov, E. ; Bahadur, J. ; He, L. ; Kravchenko, I. I. ; Smith, G. ; Pipich, V. ; Szekely, N. K.FZJ*

2014
ACS Publ. Washington, DC

Langmuir 30(33), 9985 - 9990 (2014) [10.1021/la500963q]

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Please use a persistent id in citations: doi:10.1021/la500963q

Abstract: The structure of deterministically nanopatterned surfaces created using a combination of electron beam lithography and reactive ion etching was evaluated using small-angle neutron scattering (SANS). Samples exhibit 2D neutron scattering patterns that confirm the presence of ordered nanoscale cavities consistent with the targeted morphologies as well as with SEM data analysis. Comparison of SANS intensities obtained from samples in air and in contact with an aqueous phase (pure deuterium oxide, D2O, or a contrast matched mixture of D2O + H2O) reveals formation of stable gaseous nanobubbles trapped inside the cavities. The relative volume of nanobubbles depends strongly on the hydrophobicity of the cavity walls. In the case of hydrophobic surfaces, nanobubbles occupy up to 87% of the total cavity volume. The results demonstrate the high degree of sensitivity of SANS measurements for detecting and characterizing nano- and mesoscale bubbles with the volume fraction as low as ∼10–6.

Keyword(s): Basic research (1st) ; Others (1st) ; Soft Matter, Macromolecules, Complex fluids, Biophysics (1st) ; Condensed Matter Physics (2nd) ; Soft Condensed Matter (2nd)