title: Nanofluid surface wettability through asymptotic contact angle.
abstract: This investigation introduces the asymptotic contact angle as a criterion to quantify the surface wettability of nanofluids and determines the variation of solid surface tensions with nanofluid concentration and nanoparticle size. The asymptotic contact angle, which is only a function of gas-liquid-solid physical properties, is independent of droplet size for ideal surfaces and can be obtained by equating the normal component of interfacial force on an axisymmetric droplet to that of a spherical droplet. The technique is illustrated for a series of bismuth telluride nanofluids where the variation of surface wettability is measured and evaluated by asymptotic contact angles as a function of nanoparticle size, concentration, and substrate material. It is found that the variation of nanofluid concentration, nanoparticle size, and substrate modifies both the gas-liquid and solid surface tensions, which consequently affects the force balance at the triple line, the contact angle, and surface wettability.
authors.affiliation: School of Engineering and Materials Science, Queen Mary University of London, London, United Kingdom.
authors.forename: Saeid
authors.initials: S
authors.lastname: Vafaei
authors.forename: Dongsheng
authors.initials: D
authors.lastname: Wen
authors.forename: Theodorian
authors.initials: T
authors.lastname: Borca-Tasciuc