Manipulation of liquid marbles

Ooi, Chin Hong; Nguyen, Nam‐Trung

doi:10.1007/s10404-015-1595-z

Cited by 113 publications

(105 citation statements)

References 83 publications

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“…[7,8] This result led to intense research to manipulate and understand the hydrodynamic behavior of these new entities. [9,10] However,although alot of progress has been made in the design and comprehension of liquid marbles,reported studies on their actuation have been limited to only af ew cases.A typical strategy involves the use of stimuli-responsive particles,i ncluding photosensitive [11,12] and magnetic [13][14][15] particles suspended in or coating the marble,m aking remote actuation possible but making each strategy specific to the composition of the liquid marble.C omposition-independent approaches were restricted to the use of electric [8,16,17] or ultrasonic [18] stimulation but, in these cases,l ong-range and precise transport could not be achieved. Photoactuation thus appears as ap romising alternative offering contactless, tunable,a nd highly resolved stimulation.…”

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confidence: 99%

Light‐Driven Transport of a Liquid Marble with and against Surface Flows

et al. 2016

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Liquid marbles, that is, liquid drops coated by a hydrophobic powder, do not wet any solid or liquid substrate, making their transport and manipulation both highly desirable and challenging. Herein, we describe the light-driven transport of floating liquid marbles and emphasize a surprising motion behavior. Liquid marbles are deposited on a water solution containing photosensitive surfactants. Irradiation of the solution generates photoreversible Marangoni flows that transport the liquid marbles toward UV light and away from blue light when the thickness of the liquid substrate is large enough (Marangoni regime). Below a critical thickness, the liquid marbles move in the opposite direction to that of the surface flow at a speed increasing with decreasing liquid thickness (anti-Marangoni). We demonstrate that the anti-Marangoni motion is driven by the free surface deformation, which propels the non-wetting marble against the surface flow. We call this behavior "slide effect".

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Light‐Driven Transport of a Liquid Marble with and against Surface Flows

et al. 2016

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“…A liquid marble is a liquid droplet coated with hydrophobic powder, which can roll on a solid surface12345 and float on a liquid surface due to its non-wetting coating678910111213141516. A liquid marble can be driven across a liquid surface using thermocapillarity1718.…”

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“…Liquid marbles served as micro bioreactors for culturing cells1920212223. A number of excellent review papers provided a comprehensive summary on properties and applications of liquid marbles114242526. Recently, Bormashenko et al .…”

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Measuring the Coefficient of Friction of a Small Floating Liquid Marble

Ooi

Nguyen

Evans

et al. 2016

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This paper investigates the friction coefficient of a moving liquid marble, a small liquid droplet coated with hydrophobic powder and floating on another liquid surface. A floating marble can easily move across water surface due to the low friction, allowing for the transport of aqueous solutions with minimal energy input. However, the motion of a floating marble has yet to be systematically characterised due to the lack of insight into key parameters such as the coefficient of friction between the floating marble and the carrier liquid. We measured the coefficient of friction of a small floating marble using a novel experimental setup that exploits the non-wetting properties of a liquid marble. A floating liquid marble pair containing a minute amount magnetite particles were immobilised and then released in a controlled manner using permanent magnets. The capillarity-driven motion was analysed to determine the coefficient of friction of the liquid marbles. The “capillary charge” model was used to fit the experimental results. We varied the marble content and carrier liquid to establish a relationship between the friction correction factor and the meniscus angle.

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“…A liquid marble (LM) is a drop of liquid, coated with hydrophobic powder such as polytetrafluoroethylene (PTFE). 15 The deformable and non-adhesive coating with the fine pores from the floated marble provides necessary gas exchange that is amenable for culturing multiple spheroids. Moreover, the microfluidic system improves the investigation by lowering the required volume of fluid sample, and offering a observable miniature 3D environment.…”

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confidence: 99%

A lab-on-a-chip device for investigating the fusion process of olfactory ensheathing cell spheroids

et al. 2016

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Understanding the process of fusion of olfactory ensheathing cell spheroids will lead to improvement of cell transplantation therapies to repair spinal cord injuries. The successful fusion of transplanted spheroids will enable alternative transplantation strategies to be developed for in vivo applications. This paper describes the use of a microfluidic device to trap and fuse olfactory ensheathing cell spheroids. The velocity, the pressure distribution in the device were simulated numerically to predict the trapping location. The simulation predicted the optimum flow rates for trapping the spheroids in the later experiments. Simulated particle trajectories were verified experimentally with tracing of fluorescent micro particles. The fusion process of the spheroids was investigated over a period of 48 hours. The microfluidic platform presented here can be used for testing potential drugs that can promote the fusion process and improve the transplantation therapy.

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Manipulation of liquid marbles

Cited by 113 publications

References 83 publications

Light‐Driven Transport of a Liquid Marble with and against Surface Flows

Light‐Driven Transport of a Liquid Marble with and against Surface Flows

Measuring the Coefficient of Friction of a Small Floating Liquid Marble

A lab-on-a-chip device for investigating the fusion process of olfactory ensheathing cell spheroids

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