Microbubble/Droplet Manipulation Based on Marangoni Effect
Microbubbles and microdroplets,when exposed to a uniform temperature gradient/solute concentration gradient,will undergo thermal capillary migration/solute migration,leading to the emergence of the Marangoni effect at the gas-liquid interface.This effect plays a crucial role in manipulating microbubbles or microdroplets,offering valuable applications in various fields including biology,chemistry,medicine,materials science,and micromanufacturing.In this review,provided are an overview of recent advancements about the Marangoni effect of microbubbles/droplets under different driving modes,and demonstrate the driving principle and characteristics of photothermal Marangoni effect,thermal gradient-driven Marangoni effect and solute Marangoni effect.We focus on the dynamic changes of microdroplets induced by photothermal Marangoni effect,the movement principles of droplets on diverse hydrophobic surfaces,the manipulation processes of bubble movement and bubble separation under laser irradiation,and the typical instances of bubble/droplet separation,droplet evaporation and mixing achieved through thermal gradient-driven Marangoni effect and solute Marangoni effect.Furthermore,recent applications of the Marangoni effect in microbubble/droplet manipulation are highlighted and the promising future prospects for further development and utilization of this phenomenon are discussed.
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