Measuring the Coefficient of Friction of a Small Floating Liquid Marble

Ooi, Chin Hong; Nguyen, Anh V.; Evans, Geoffrey M.; Dao, Dzung Viet; Nguyen, Nam‐Trung

doi:10.1038/srep38346

Cited by 26 publications

(21 citation statements)

References 41 publications

(53 reference statements)

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“…For a successful trapping case, a stationary floating LM is firstly attracted from the initial equilibrium position from a given initial distance after overcoming the static friction force F SF . When the LM starts moving, the friction then turns into the kinetic type F KF , which has already been characterized previously by our group [44]. The final equilibrium position of the floating LM is right below the electrode centroid after a few damping oscillations.…”

Section: One-dimensional Marble Trapping Modelingsupporting

confidence: 54%

Dielectrophoretic Trapping of a Floating Liquid Marble

et al. 2019

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A liquid marble, a liquid droplet coated with hydrophobic powder, is an emerging digital microfluidic platform. It can potentially serve as a mixer or reactor for chemical and biological assays in the microscale. Automated manipulation of liquid marbles is essential for the implementation of more microfluidic functions in the technology platform of "lab in a marble". We report the analytical and experimental results of trapping a floating liquid marble using dielectrophoresis in a nonuniform electric field. Liquid marbles with volumes ranging from 5 to 50 μL are effectively trapped by the dielectrophoretic force from a horizontal distance ranging from 10 to 60 mm and under an applied voltage ranging from 1.6 to 5 kV. A one-dimensional analytical model is then proposed for the trapping process and agrees well with experimental data. Finally, based on the relationship between the static friction coefficient and the Bond number of a floating liquid marble, an operation map is derived for successful trapping of the liquid marble, providing a better insight into controlled manipulation of liquid marbles.

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Section: One-dimensional Marble Trapping Modelingsupporting

confidence: 54%

Dielectrophoretic Trapping of a Floating Liquid Marble

et al. 2019

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“…where

τ = m / 2 π η a

and

v_{0} = γ / η

and χ ,

v

m

a

V

and

ϕ

are the magnetic susceptibility, velocity, mass, radius, volume, and wrapping angle of the LM, respectively (Supporting Information, Scheme S1), and

h (r)

is the local elevation of the substrate,

μ_{0}

is the vacuum permeability, and C is a numerical prefactor of the drag force (on the order of 1).

ϕ

was determined according to Ooi et al .…”

Section: Figurementioning

confidence: 99%

Magnetic Actuation of Drops and Liquid Marbles Using a Deformable Paramagnetic Liquid Substrate

et al. 2017

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The magnetic actuation of deposited drops has mainly relied on volume forces exerted on the liquid to be transported, which is poorly efficient with conventional diamagnetic liquids such as water and oil, unless magnetosensitive particles are added. Herein, we describe an ew and additive-free way to magnetically control the motion of discrete liquid entities.O ur strategy consists of using ap aramagnetic liquid as ad eformable substrate to direct, using am agnet, the motion of various floating liquid entities,r anging from naked drops to liquid marbles.Abroad variety of liquids,i ncluding diamagnetic (water,o il) and nonmagnetic ones,c an be efficiently transported using the moderate magnetic field (ca. 50 mT) produced by as mall permanent magnet. Complex trajectories can be achieved in ar eliable manner and multiplexing potential is demonstrated through on-demand drop fusion. Our paramagnetofluidic method advantageously works without any complex equipment or electric power,i np hase with the necessary development of robust and low-cost analytical and diagnostic fluidic devices.

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“…A liquid marble can be manipulated using various means as reported in a number of recent review articles Quere 2001, 2006;Bormashenko 2011Bormashenko , 2012Bormashenko , 2017Newton 2011, 2015;Ooi and Nguyen 2015). Most of the manipulation methods used the electromagnetic (Bormashenko et al 2008;Dorvee et al 2004;Khaw et al 2017Khaw et al , 2016Lin et al 2016;Long et al 2009;Ooi et al 2016b;Xue et al 2010;Zhao et al 2010Zhao et al , 2012Zhu et al 2011) or thermocapillary forces (Bormashenko et al 2015;Kavokine et al 2016;Ooi et al 2015a;Paven et al 2016). For instance, droplets and liquid marbles can move across electrode arrays owing to the electrowetting phenomenon (Newton et al 2007).…”

Section: Introductionmentioning

confidence: 99%

“…For instance, droplets and liquid marbles can move across electrode arrays owing to the electrowetting phenomenon (Newton et al 2007). Magnetic liquid marbles can move across solid (Xue et al 2010;Zhao et al 2010Zhao et al , 2012 and liquid surfaces (Han et al 2016;Khaw et al 2017Khaw et al , 2016Ooi et al 2016b;Zhang et al 2012) under the influence of a magnetic field. These marbles can even be picked up vertically, which enables three-dimensional (3D) digital microfluidics handling.…”

Section: Introductionmentioning

confidence: 99%

Picking up and placing a liquid marble using dielectrophoresis

Ooi

Jin

Nguyen

et al. 2018

Microfluid Nanofluid

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A liquid marble is a droplet coated with hydrophobic powder. The porous and hydrophobic coating prevents physical contact between the liquid and its surroundings without compromising gas exchange. As such, the liquid marble is an excellent platform for culturing cells. With the promising biomedical applications of the liquid marble, numerous studies have been conducted to improve its handling using magnetism, which limits the liquid marble coating to hydrophobised ferromagnetic materials. In this paper, we propose a novel, simple and cheap method of liquid marble manipulation such as pick and place based on the well-known dielectrophoresis force. Liquid marbles of various volumes were picked up using an electrode with a high voltage bias, moved to a different location and placed intact. This method provides reliable handling to a host of existing non-ferromagnetic liquid marbles without the need to engineer their coatings. Furthermore, this method enables the automation of the liquid marble handling process. This paper provides an empirical relationship to link the pickup force to the experimental parameters.

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Measuring the Coefficient of Friction of a Small Floating Liquid Marble

Cited by 26 publications

References 41 publications

Dielectrophoretic Trapping of a Floating Liquid Marble

Dielectrophoretic Trapping of a Floating Liquid Marble

Magnetic Actuation of Drops and Liquid Marbles Using a Deformable Paramagnetic Liquid Substrate

Picking up and placing a liquid marble using dielectrophoresis

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