Surface rearrangement of water-immersed hydrophobic solids by gaseous nanobubbles

0438335 - ÚFCH JH 2015 RIV US eng J - Článek v odborném periodiku
Tarábková, Hana - Bastl, Zdeněk - Janda, Pavel
Surface rearrangement of water-immersed hydrophobic solids by gaseous nanobubbles.
Langmuir. Roč. 30, č. 48 (2014), s. 14522-14531. ISSN 0743-7463
Grant CEP: GA ČR(CZ) GAP208/12/2429
Institucionální podpora: RVO:61388955
Klíčová slova: Deionized water * Drops * Floods
Kód oboru RIV: CF - Fyzikální chemie a teoretická chemie
Impakt faktor: 4.457, rok: 2014

Interactions of gaseous (ambient) nanobubbles (10-100 nm diameter) with different hydrophobic materials - Teflon, polystyrene, paraffin, and basal plane highly ordered pyrolytic graphite (HOPG) - are studied by AFM in situ and ex situ. Exactly identical surface locations are examined before and after exposure to ambient gas nanobubbles in deionized water and compared for nanomorphological changes. While freely flooded/immersed surfaces, regularly occupied by nanobubbles, do not exhibit resolvable alterations, significant surface rearrangement is found on whole flooded area after mild pressure drop (10 kPa) applied on the solid-liquid interface. Nanopattern and its characteristic dimension appear to be material specific and solely reflect surface-nanobubble interaction. Mild, nonswelling, noncorrosive conditions (20°C, deionized water) prevent intervention of chemical reaction and high-energy-demanding processes. Experimental results, in accordance with the presented model, indicate that the mild pressure drop triggers expansion of pinned nanobubbles, imposing local tensile stress on the solid surface. Consequently, nanobubbles should be considered as large-area nanoscale patterning elements. (Figure Presented).
Trvalý link: http://hdl.handle.net/11104/0241757