Capillarity: revisiting the fundamentals of liquid marbles

Singha, Pradip; Ooi, Chin Hong; Nguyen, Nhat‐Khuong; Sreejith, Kamalalayam Rajan; Jin, Jing; Nguyen, Nam‐Trung

doi:10.1007/s10404-020-02385-9

Cited by 32 publications

(31 citation statements)

References 126 publications

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“…[1][2][3][4] These intriguing structures are liquid droplets encapsulated by particles and are thermodynamically stable due to the replacement of a high energy liquid-vapour interface with lower energy liquid-solid and solid-vapour interfaces. 1,[5][6][7][8][9][10] These liquid marbles have been proposed for use in a wide variety of research and industrial arenas including in microfluidics, 11 cosmetics, 12 as microreactors 13,14 and in biomedical applications. [15][16][17] These applications are due to their unique properties such as substantial elasticity, gas permeability, ability to be transported along a substrate with little friction and their ability to be transported across a liquid-vapour interface with no loss of the internal liquid, whilst demonstrating a diminished rate of evaporation.…”

Section: Introductionmentioning

confidence: 99%

“…[15][16][17] These applications are due to their unique properties such as substantial elasticity, gas permeability, ability to be transported along a substrate with little friction and their ability to be transported across a liquid-vapour interface with no loss of the internal liquid, whilst demonstrating a diminished rate of evaporation. 2,5,6,9,10,17,18 Despite spheres being historically used to stabilise these droplets, there has been some exploration in the use of platelet particles, specifically fluorinated bentonite and sericite, to stabilise primarily oil droplets as opposed to aqueous ones. 19,20 More recently, however, large platelets have been demonstrated to be able to stabilise aqueous droplets, resulting in so-called polyhedral liquid marbles.…”

Section: Introductionmentioning

confidence: 99%

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Formation of liquid marbles & aggregates: rolling and electrostatic formation using conductive hexagonal plates

et al. 2020

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Formation of liquid marbles & aggregates: rolling and electrostatic formation using conductive hexagonal plates

et al. 2020

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“…Throughout the years, different versions of the ADSA method have been developed such as ADSA-Profile [17,18], ADSA-Diameter (ADSA-D) [19], and ADSA-Height and Diameter (ADSA-HD) [20]. Besides measuring conventional liquid droplets, these tools have been used to analyse liquid marbles, which are liquid droplets coated with micro-or nanoparticles [21][22][23][24][25][26][27]. Thanks to their unique features such as high elasticity, self-propulsion, and ability to coalesce, liquid marbles are present in applications such as micro-or nanoscale chemical reaction control, microfluidics, or cosmetics [28][29][30][31][32][33][34][35][36][37][38][39][40][41].…”

Section: Introductionmentioning

confidence: 99%

Modelling Sessile Droplet Profile Using Asymmetrical Ellipses

Tran¹,

Nguyen

Singha

et al. 2021

Processes

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Modelling the profile of a liquid droplet has been a mainstream technique for researchers to study the physical properties of a liquid. This study proposes a facile modelling approach using an elliptic model to generate the profile of sessile droplets, with MATLAB as the simulation environment. The concept of the elliptic method is simple and easy to use. Only three specific points on the droplet are needed to generate the complete theoretical droplet profile along with its critical parameters such as volume, surface area, height, and contact radius. In addition, we introduced fitting coefficients to accurately determine the contact angle and surface tension of a droplet. Droplet volumes ranging from 1 to 300 µL were chosen for this investigation, with contact angles ranging from 90° to 180°. Our proposed method was also applied to images of actual water droplets with good results. This study demonstrates that the elliptic method is in excellent agreement with the Young–Laplace equation and can be used for rapid and accurate approximation of liquid droplet profiles to determine the surface tension and contact angle.

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“…The encapsulating particles determine the elasticity, [16] robustness, [4] and the effective surface tension of a liquid marble. [17,18] Furthermore, liquid marbles with functional shells can be manipulated using light, [19][20][21][22] temperature gradient, [23] tension up to a threshold. Decreasing shell thickness was caused by a higher degree of penetration of the particles into the droplet.…”

Section: Introductionmentioning

confidence: 99%

Effect of Core Liquid Surface Tension on the Liquid Marble Shell

Singha

Nguyen

Sreejith

et al. 2020

Adv Materials Inter

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surface tension gradient, [24,25] magnetic field, [26-29] electric field, [30-34] mechanical force, [4,35] and pH. [36-38] The porous liquid marble shell enables gas exchange, which allows it to serve as a gas sensor, [39,40] a microreactor for gas-phase reactions, [41,42] a carbon dioxide capturing tool, [43] as well as a cell culture platform. [15,44,45] The behavior and the structure of a liquid marble shell depends on the preparation method, morphology of the encapsulating particles, and the properties of the core liquid. This paper investigates the relationship between the core liquid and the properties of the shell. A liquid marble shell represents a flexible superhydrophobic surface analogous to Cassie-Baxter wetting. [46] The shell consists of encapsulating particles and pores that prevent direct contact between the core liquid and the carrying substrate. There are only a few works in available literature that show the structure of a liquid marble shell. [12,47,48] Notable are the observations by Aussillous et al. [12] and Bormashenko et al. [48] using an optical microscope and environmental scanning electron microscope, respectively. Both studies revealed the existence of interparticle gaps at the surface of a liquid marble. Lin et al. investigated the shell of a liquid marble with an optical microscope. [49] The team reported that a liquid marble shell is not fully covered with particles. Furthermore, the pores on the shell cause liquid marbles to evaporate. [50] Nguyen et al. investigated on the shell structure using a confocal microscope. [47] The team showed that fine particles are packed in between coarse particles within the shell. The particles at the innermost layer of the shell always penetrate the core liquid. [47] Wang et al. reported that the extent of penetration depends on the surface tension of the core liquid. [51] A reduction in the surface tension of the core liquid increased the penetration into it and decreased the lifetime. Prior works discuss only on the structure of the shell. There has yet to be a detailed study on the properties of the shell in response to the core liquid surface tension. The integrity of a liquid marble depends on the properties of the shell. Therefore, it is essential to study the behavior of the shell to understand its effects on both the static and the dynamic properties of a liquid marble. Our present work investigates the effect of the surface tension of the core liquid on the shell. The surface tension was controlled using known quantities of surfactant. Shell thickness decreased with the surface

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Capillarity: revisiting the fundamentals of liquid marbles

Cited by 32 publications

References 126 publications

Formation of liquid marbles & aggregates: rolling and electrostatic formation using conductive hexagonal plates

Formation of liquid marbles & aggregates: rolling and electrostatic formation using conductive hexagonal plates

Modelling Sessile Droplet Profile Using Asymmetrical Ellipses

Effect of Core Liquid Surface Tension on the Liquid Marble Shell

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