Reliable manipulation of gas bubbles by regulating interfacial morphologies and chemical components†
The manipulation of gas bubble behavior is crucial to gas bubble-related applications. In nature, many biological surfaces offer reliable and effective manipulation of gas bubbles in aqueous media via unusual micro/nano-hierarchical structures and chemical compositions. This inspired us to construct a series of interfaces with well-ordered microstructures and controllable chemical compositions. Reliable manipulation of CO2 gas bubble behavior can be achieved in CO2 supersaturated aqueous solutions. The CO2 bubbles generated on hydrophilic interfaces grew in situ and were then released with small diameters and spherical morphologies. The diameters of the CO2 bubbles on hydrophilic interfaces decreased as a function of interfacial roughness. FAS modification enhanced the adhesion force between the hydrophobic interfaces and the CO2 bubbles. The CO2 bubbles grew with a spherical crown shape and then coalesced with their neighbors. They finally detached and formed large diameter interfaces. As the interface hydrophobicity and roughness increased, CO2 pockets or continuous CO2 films can be created among the rough microstructures.