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Influence of Surface‐Modified Nanoparticles on the Hydrodynamics of Rising Bubbles
Author(s) -
Fayzi Pouyan,
Bastani Dariush,
Lotfi Marzieh,
Miller Reinhard
Publication year - 2021
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.201900234
Subject(s) - surface tension , fumed silica , pulmonary surfactant , viscosity , materials science , nanoparticle , chemical engineering , surface modification , hydrophobic silica , bubble , drag , composite material , nanotechnology , thermodynamics , physics , parallel computing , engineering , computer science
Abstract Local velocities of bubbles rising in four different nanosilica solutions were investigated experimentally. Also, the density, viscosity, and surface tension of fumed nanosilica and modified nanosilica solutions were measured. Heat treatment and chemical functionalization were used to modify the properties of silica nanoparticles. It was found that the addition of nanosilica affected the hydrodynamics of the rising bubble by increasing the drag friction at the interface. However, environmentally responsive nanosilica particles behaved like surfactant molecules, due to the interfacial activity of hydrophilic and hydrophobic chains. Silica nanoparticles coated with both hydrophilic and hydrophobic agents had a stronger effect on the interfacial properties than those coated only with the hydrophobic agent.