Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 109, Issue 26, Pages 10210-10213Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1204328109
Keywords
micropillars; silicone nanofilaments; optical data storage; bistable; two-tier
Categories
Funding
- Nokia Research Center
- Academy of Finland [253949, 256206]
- Finnish Funding Agency for Technology and Innovation
- Medical Research Council
- Medical Research Council [G1100312] Funding Source: researchfish
- Academy of Finland (AKA) [256206, 253949, 256206, 253949] Funding Source: Academy of Finland (AKA)
- MRC [G1100312] Funding Source: UKRI
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Nature offers exciting examples for functional wetting properties based on superhydrophobicity, such as the self-cleaning surfaces on plant leaves and trapped air on immersed insect surfaces allowing underwater breathing. They inspire biomimetic approaches in science and technology. Superhydrophobicity relies on the Cassie wetting state where air is trapped within the surface topography. Pressure can trigger an irreversible transition from the Cassie state to the Wenzel state with no trapped air-this transition is usually detrimental for nonwetting functionality and is to be avoided. Here we present a new type of reversible, localized and instantaneous transition between two Cassie wetting states, enabled by two-level (dual-scale) topography of a superhydrophobic surface, that allows writing, erasing, rewriting and storing of optically displayed information in plastrons related to different length scales.
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