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HERO ID
5324905
Reference Type
Journal Article
Title
Fabrication of durable superhydrophobic epoxy/cashew nut shell liquid based coating containing flower-like zinc oxide for continuous oil/water separation
Author(s)
Lorwanishpaisarn, N; Kasemsiri, P; Srikhao, N; Jetsrisuparb, K; Knijnenburg, JTN; Hiziroglu, S; Pongsa, U; Chindaprasirt, P
Year
2019
Is Peer Reviewed?
1
Journal
Surface and Coatings Technology
ISSN:
0257-8972
Volume
366
Page Numbers
106-113
DOI
10.1016/j.surfcoat.2019.03.021
Web of Science Id
WOS:000465366400013
Abstract
Superhydrophobic filters can be applied as cost-effective separation media to overcome oil contamination issues. In this study, superhydrophobic material based on natural resources was explored as a coating material for sustainable oil/water separation membranes. Epoxy (EP) cured with cashew nut shell liquid (CNSL, a bio-based curing agent) was coated on a stainless steel mesh (E-mesh) using a simple immersion technique. Different amounts of ZnO (0-60 wt%) were added to EP/CNSL to increase coating surface roughness. The highest water contact angle (WCA) of 149.2 degrees was measured for the E-mesh containing 60 wt% ZnO (E-ZnO-60 mesh). Modification of coated ZnO by immersion in acetic and stearic acid can create the flower-like morphology of ZnO (F-ZnO), which even further enhanced the coating hydrophobicity. The E-mesh containing 60 wt% F-ZnO (E-F-ZnO-60 mesh) showed superhydrophobicity with a WCA of 163.8 degrees. This high hydrophobicity was obtained after chemical and mechanical durability tests, indicating excellent coating stability. The continuous oil/water separation efficiency of E-F-ZnO-60 mesh was over 97% for 75 min after the mechanical stability testing. Based on these results, this durable superhydrophobic mesh showed promising cost-effective coating applications and oil/water separation medium.
Keywords
Superhydrophobic; Continuous oil/water separation; Flower-like zinc oxide; Bio-based curing agent
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