Journal
ACS APPLIED POLYMER MATERIALS
Volume 1, Issue 10, Pages 2582-2589Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsapm.9b00331
Keywords
superoleophobic polyelectrolyte multilayers; oil repellency; force; ionic strength; AFM
Funding
- National Natural Science Foundation of China [51774303, 51534007]
- Science Foundation of China University of Petroleum, Beijing [C201602]
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Creating surfaces with controlled superoleophobicity is of real significance for the manipulation, transportation, and self-cleaning of organic fluids of strategic importance. In the present work, particular attention is given to elucidate the superoleophobicity mechanism of surfaces coated with polyelectrolyte multilayers (PEMs) assembled by layer-by-layer deposition of the cationic polyelectrolyte polydiallyldimethylammonium chloride (PDDA) and the anionic polyelectrolyte poly(styrenesulfonate) (PSS) in 1.0 M NaCl solution. The atomic force microscopy (AFM) drop probe technique was used to measure the salinity-specific adhesion forces between the oil droplet and underwater polyelectrolyte PEM-coated surface. Meanwhile, topographic images of the fabricated PEMs in solutions with different ionic strengths were also obtained and compared. The results show that the fabricated (PDDA/ PSS)(1.5), (PDDA/PSS)(3.5), and (PDDA/PSS)(4.0) PEMs exhibit excellent oil repellency upon immersion into aqueous solutions with high salinity. Additionally, the underwater superoleophobicity of the prepared PEM films was well-demonstrated through AFM adhesion force measurements. It is proven in our study that the underwater superoleophobicity of the fabricated surface has a strong relationship with the salinity-specific behavior of deposited polyelectrolytes.
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