Directional Motion on Water Surface With Keel Extruded Footpads Propelled by Marangoni Effect

Kwak, Bokeon; Choi, Soyoung; Bae, Joonbum

doi:10.1109/lra.2020.3020557

Cited by 10 publications

(12 citation statements)

References 30 publications

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“…Controlling the chemistry of such reaction-driven Marangoni flows becomes then an interesting approach to achieve complex behavior at air-water interfaces and within organic droplets. [44][45][46] Such insight is also useful to develop applications where Marangoni flows are used for propulsion, [47,48] self-assembly direction [49][50][51] or to design systems with Marangoni-based feedback mechanisms. [52]…”

Section: Discussionmentioning

confidence: 99%

Self‐Sustained Marangoni Flows Driven by Chemical Reactions**

Nguindjel

Korevaar

2021

ChemSystemsChem

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Out-of-equilibrium chemical systems, comprising reaction networks and molecular self-assembly pathways, rely on the delivery of reagents. Rather than via external flow, diffusion or convection, we aim at self-sustained reagent delivery. Therefore, we explore how the coupling of Marangoni flow with chemical reactions can generate self-sustained flows, driven by said chemical reactions, and -in turn -sustained by the delivery of reagents for this reaction. We combine a photoacid generator with a pH-responsive surfactant, such that local UV exposure decreases the pH, increases the surface tension, and triggers the emergence of a Marangoni flow. We study the impact of reagent concentrations and identify threshold conditions at which flow can emerge. Surprisingly, we unraveled an antagonistic influence of the reagents on key features of the flow such as velocity and duration, and rationalize these findings via a kinetic model. Our study displays the potential of reactiondriven flow to establish autonomous control in fuel delivery of out-of-equilibrium systems.

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Section: Discussionmentioning

confidence: 99%

Self‐Sustained Marangoni Flows Driven by Chemical Reactions**

Nguindjel

Korevaar

2021

ChemSystemsChem

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“…Controlling the chemistry of such reaction-driven Marangoni flows becomes then an interesting approach to achieve complex behavior at air-water interfaces and within organic droplets [40][41][42] . Such insight is also useful to develop applications where Marangoni flows are used for propulsion 43,44 , self-assembly direction [45][46][47] or to design systems with Marangonibased feedback mechanisms 48 .…”

Section: Discussionmentioning

confidence: 99%

Self-sustained Marangoni Flows Driven by Chemical Reactions

Nguindjel¹,

Korevaar

2021

Preprint

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Out-of-equilibrium chemical systems, comprising reaction networks and molecular self-assembly pathways, rely on the delivery of reagents. Rather than via external flow, diffusion or convection, we aim at self-sustained reagent delivery. Therefore, we explore how the coupling of Marangoni flow with chemical reactions can generate self-sustained flows, driven by said chemical reactions, and – in turn – sustained by the delivery of reagents for this reaction. We combine a photoacid generator with a pH-responsive surfactant, such that local UV exposure decreases the pH, increases the surface tension and triggers the emergence of a Marangoni flow. We study the impact of reagent concentrations and identify threshold conditions at which flow can emerge. Surprisingly, we unraveled an antagonistic influence of the reagents on key features of the flow such as interfacial velocity and duration, and rationalize these findings via a kinetic model. Our study displays the potential of reaction-driven flow to establish autonomous control in fuel delivery of out-of-equilibrium systems.

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“…Alternative approaches involve nanocellulose aerogel membranes that are permeable to gases but impermeable to liquids (water and oil), thus allowing locomotion and flotation on the surface [ 12 ]. Alternative strategies demonstrate passive directional motion without an active controller obtaining thrust by periodically dripping alcohol behind to utilize the Marangoni effect, but more complex components and design are needed [ 23 ]. Recently, self-induced motion has been widely studied for two main cases.…”

Section: Introductionmentioning

confidence: 99%

On-the-Fly Formation of Polymer Film at Water Surface

2022

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The self-propulsion of bodies floating in water is of great interest for developing new robotic and intelligent systems at different scales, and whenever possible, Marangoni propulsion is an attractive candidate for the locomotion of untethered micro-robots. Significant cases have been shown using liquid and solid surfactants that allow an effective propulsion for bodies floating on water to be achieved. Here, we show for the first time a strategy for activating a twofold functionality where the self-propulsion of a floating body is combined with the formation of a polymer thin film at the water surface. In fact, we demonstrate that by using polymer droplets with an appropriate concentration of solvent and delivering such drops at specific locations onto freely floating objects, it is possible to form “on-the-fly” thin polymer films at the free water surface. By exploiting self-propulsion, a polymer thin film can be formed that could cover quite extensive areas with different shapes depending on the motion of the floating object. This intriguing twice-functionality activated though a single phenomenon, i.e., film formation and related locomotion, could be used in perspective to perform complex operations at water surfaces, such as dynamic liquid packaging, cleaning, and moving away floating particles, monolayer films, or macro-sized objects, as discussed in the text.

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Directional Motion on Water Surface With Keel Extruded Footpads Propelled by Marangoni Effect

Cited by 10 publications

References 30 publications

Self‐Sustained Marangoni Flows Driven by Chemical Reactions**

Self‐Sustained Marangoni Flows Driven by Chemical Reactions**

Self-sustained Marangoni Flows Driven by Chemical Reactions

On-the-Fly Formation of Polymer Film at Water Surface

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