Solution‐processed graphene oxide coatings for enhanced heat transfer during dropwise condensation of steam. Issue 1 (17th October 2020)

• Record Type: Journal Article
• Authors: Colusso, Elena; Tancon, Marco; Cazzola, Lorenzo; Parin, Riccardo; Agnoli, Stefano; De Boni, Francesco; Pelizzo, Maria Guglielmina; Della Gaspera, Enrico; Del Col, Davide; Martucci, Alessandro
• Is Part Of: Nano select. Volume 2:Issue 1(2021)
• Page Start: 61
• Page End: 71
• Publication Date: 2020-10-17
• Subjects: dropwise condensation -- graphene oxide -- heat transfer -- solution‐processed coating; Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.5
• DOI: 10.1002/nano.202000105
• Languages: English
• ISSNs: 2688-4011

Abstract

Abstract: Hydrophobic coatings have the ability to promote dropwise condensation on metal surfaces. In this work, reduced graphene oxide coatings are fabricated by dip coating copper substrates into a graphene oxide colloidal suspension, followed by thermal reduction. The formation of reduced graphene oxide is demonstrated by Raman and X‐ray photoelectron spectroscopy characterizations, while scanning electron microscopy, atomic force microscopy and dynamic water contact angle analyses are employed to verify the morphology and the wettability of the coatings. The prepared coatings demonstrate applicability in the promotion of dropwise condensation of pure steam, with an 8‐fold enhancement of the heat transfer coefficient compared to film‐wise condensation. In addition, durability of the reduced graphene oxide coatings of more than 100 hours in the tested condition is reported. Abstract : Reduced graphene oxide coatings on copper substrates are prepared by a simple and scalable solution‐based process. The prepared coatings are hydrophobic and promote dropwise condensation of steam in industrial conditions.