Liquid marble-based digital microfluidics – fundamentals and applications

et al. 2021

React. Chem. Eng.

Self Cite

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electrostatically excited liquid marble as a micromixer

et al. 2021

React. Chem. Eng.

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“…Liquid marble is a non‐wetting droplet coated with micro‐ or nano‐sized hydrophobic particles [1] . Attractive features of a liquid marble such as low evaporation rate, high robustness, tuneable porosity, and ease of manipulation enable it to be an efficient tool for microfluidic applications [2–11] . These features depend on the properties and structure of the liquid marble shell [12–14] .…”

Section: Introductionmentioning

confidence: 99%

Investigation of liquid marble shell using X‐ray: shell thickness and effective surface tension

et al. 2021

ChemNanoMat

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Liquid marble is a non‐wetting droplet encapsulated by micro‐ or nano‐sized hydrophobic particles. Recently, liquid marble has been emerging as a tool for digital microfluidics. Thus, a detailed understanding of the fundamentals of liquid marble is essential. The shell of a liquid marble has an opaque and fuzzy appearance which hinders in‐depth investigation using conventional optical microscopy. We used X‐ray computerized microtomography (CMT) to generate an image with a visible interface between the core liquid and the shell to overcome this problem. The interface facilitates accurate measurement of the shell thickness and the effective surface tension. This work investigates the effect of liquid marble preparation methods and liquid marble volumes on shell thickness and effective surface tension. We found that increasing the revolution speed during liquid marble preparation increases shell thickness. A liquid marble shell has a uniform packing when the revolution speed is 200–300 rpm. We also found that the effective surface tension of liquid marbles decreases with increasing volume. This could be due to a stronger effect of gravitational force for a large liquid marble. The findings from this work could provide a new insight into the characterization of liquid marble and open up a new direction of fundamental research of liquid marble shell.

“…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,

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.