Single-Step Nanoporation of Water-Immersed Polystyrene Film by Gaseous Nanobubbles
journal contributionposted on 04.08.2016, 00:00 by Hana Tarábková, Pavel Janda
Nanoporation of planar polystyrene (PS) film by gaseous nanobubbles is described. Ambient gas (air) surface nanobubbles are used to create rounded nanopinholes in supported ultrathin PS films immersed in water. Nanoporation proceeds under biocompatible conditionsin deionized water at room temperature (20 °C) in the absence of any high-energy-demanding processes, in a single step triggered by short (5 s) moderate pressure drop (Δp ≈ −10 kPa) applied on an aqueous phase. Atomic force microscopy (AFM) analysis shows a relatively narrow dimensional distribution, with the prevailing nanopinhole radius of 10 nm and uniform spread with an appearance density of ∼600/μm2. The nanoporation mechanism is discussed. “Nanobubble/tip-assisted” nanoindentation phenomenon is observed based on the compounded interaction of the surface nanobubble with the AFM tip upon prolonged in situ nanobubble scanning.
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ultrathin PS films10 nmAmbient gashigh-energy-demanding processesnanobubble scanningsurface nanobubblessurface nanobubbleAFM tipuniform spreadNanoporation proceedsAtomic force microscopynanopinhole radiusSingle-Step Nanoporationappearance densityGaseous Nanobubbles Nanoporationnanoporation mechanismWater-Immersed Polystyrene Film