Hierarchical liquid marbles formed using floating hydrophobic powder and levitating water droplets

Roy, Pritam Kumar; Binks, Bernard P.; Shoval, Shraga; Dombrovsky, Leonid A.; Bormashenko, Edward

doi:10.1016/j.jcis.2022.06.168

Cited by 3 publications

(2 citation statements)

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“…42 In another work, the formation of hierarchical liquid marbles on particles floating (fluorinated fumed silica, polytetrafluoroethylene) on a heated water-vapor interface by the condensation of water droplets levitating above the particle layer was reported. 46 Though all of the above-discussed methods performed well in the volume range of 2−20 μL, fabrication and performance analysis of fully coated submicroliter LMs/JLMs remain a gap in the literature. The major hurdle in this direction is the requirement of a preproduced pristine submicroliter liquid droplet and converting it to an LM.…”

Section: ■ Introductionmentioning

confidence: 99%

“…In the fabrication of LM by self-assembly on the water surface method, a liquid droplet is placed on a floating particle raft and gets coated with particles as it sinks into the liquid. , The droplet-impact fabrication technique enables the simple and fast production of LMs and Janus LMs (JLMs) with controlled particle coverage. − In a recent work, we demonstrated the fabrication of 5–15 μL sized JLMs by exploiting impact-driven spreading and internal flows at a Weber number ( We ) in the range 24–35 . In another work, the formation of hierarchical liquid marbles on particles floating (fluorinated fumed silica, polytetrafluoroethylene) on a heated water-vapor interface by the condensation of water droplets levitating above the particle layer was reported . Though all of the above-discussed methods performed well in the volume range of 2–20 μL, fabrication and performance analysis of fully coated submicroliter LMs/JLMs remain a gap in the literature.…”

Section: Introductionmentioning

confidence: 99%

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Droplet-Impact Driven Formation of Ultralow Volume Liquid Marbles with Enhanced Mechanical Stability and Sensing Ability

Lekshmi

Varanakkottu

2022

Langmuir

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Liquid marbles (LMs), droplets encapsulated with micro/nanoparticles, have attracted significant attention owing to their potential applications in various fields, ranging from microbioreactors to sensors. The volume of the LMs is a key parameter determining their mechanical stability and gas sensing ability. It is ideal to work with small volumes because of their better mechanical stability and gas sensing power compared to the larger LMs. Though many methods exist for producing LMs in the volume range above 2 μL, no reliable method exists to prepare fully coated submicroliter LMs with tunable volume. The situation becomes even more difficult when one attempts to produce tiny Janus Liquid Marbles (JLMs). This paper presents a simple, singlestep, and efficient strategy for obtaining both the pristine LMs and JLMs in the volume range 200 nL to 18 μL. The core idea relies on the impact of a liquid drop on a particle bed at a Weber number of ∼55 to produce two daughter droplets and to convert these droplets into LMs/JLMs. The whole process takes only a few tens of milliseconds (∼50 ms). We have rendered the experimental schemes so that both the JLMs and pristine LMs can be produced in a single step, with control over their volume. The mechanical stability analysis of the prepared marbles indicates that 200 nL is 5 times more stable than 10 μL of LMs. The 0.72 μL LMs prepared with a 0.5 v/v % phenolphthalein indicator solution showed 3 times faster response time to ammonia gas sensing than 10 μL of LMs. The results presented in this work open up a new route for the rapid and reliable production of both multilayered LMs and JLMs with tunable volume in a wide range (200 nL to 18 μL).

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Section: ■ Introductionmentioning

confidence: 99%