期刊
NANO LETTERS
卷 19, 期 3, 页码 1892-1901出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.8b04972
关键词
Super-hydrophobicity; super-oleophobicity; super-amphiphobicity; super-omniphobicity; liquid repellency; surface energy density
类别
资金
- Australian National University
- Marie SklodowskaCurie ESR fellowship under the Horizon 2020 program (LubISS network grant) [722497]
- Discovery Translation Fund at the ANU [DTF238]
- Australian Microscopy and Microanalysis Research Facility (AMMRF)
Super-hydrophobic, super-oleo(amphi)phobic, and super-omniphobic materials are universally important in the fields of science and engineering. Despite rapid advancements, gaps of understanding still exist between each distinctive wetting state. The transition of super-hydrophobicity to super-(oleo-, amphi-, and omni-)phobicity typically requires the use of reentrant features. Today, re-entrant geometry induced super-(amphi- and omni-)phobicity is well-supported by both experiments and theory. However, owing to geometrical complexities, the concept of re-entrant geometry forms a dogma that limits the industrial progress of these unique states of wettability. Moreover, a key fundamental question remains unanswered: are extreme surface chemistry enhancements able to influence super-liquid repellency? Here, this was rigorously tested via an alternative pathway that does not require explicit designer re-entrant features. Highly controllable and tunable vertical network polymerization and functionalization were used to achieve fluoroalkyl densification on nanoparticles. For the first time, relative fluoro-functionalization densities are quantitatively tuned and correlated to super-liquid repellency performance. Step-wise tunable super-amphiphobic nanoparticle films with a Cassie-Baxter state (contact angle of >150 degrees and sliding angle of <10 degrees) against various liquids is demonstrated. This was tested down to very low surface tension liquids to a minimum of ca. 23.8 mN/m. Such findings could eventually lead to the future development of super-(amphi)omniphobic materials that transcend the sole use of re-entrant geometry.
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