Nanobubbles (NBs) in water exhibit many appealing characteristics, such as a long residence time of bubbles in water due to their low buoyancy and stability against coalesces, collapse or burst. Other characteristics are like long retention time in water empower reactions, enhanced mass transfer in processes such as ozonation or aeration to increase dissolved ozone and oxygen in water for reactions or pollutant degradation. In addition, NBs can exceed solubility barriers and reach supersaturated state for ozone, oxygen or other gases that may have low solubility in water. Therefore, NBs hold promise in green and sustainable engineering applications in diverse fields (e.g., water/wastewater treatment, food processing, medical applications, and agriculture). NBs were generated by a ceramic membrane generation system in Zhang’s laboratory at NJIT. The hydrodynamic diameters of NBs are around 200~400 nm depending on the injection gas pressure and surface hydrophobicity of the ceramic membrane. The colloidal sizes and zeta potentials of NBs were measured by dynamic light scattering (DLS). NBs that deposited on substrate surface (e.g., HOPG, mica or silicon wafer) were also imaged by atomic force microscopy (AFM). We have also sought to establish conditions for AFM nanomechanics measurements of NBs to determine the elastic modulus and internal pressure. We further analyzed the electrochemical (EC) activity of different NBs (e.g., oxygen, hydrogen, and nitrogen), using cyclic voltammetry (CV) and scanning electrochemical microscopy coupling with AFM (SECM-AFM), respectively.

Characterization of Colloidal, Mechanical and Electrochemical Properties of Nanobubbles in Water

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.