Molecular-level analysis of alkyl chain dependent voltage-induced microfluidic alcohol droplet actuation on Teflon/Pt/glass substrate: Revealing the unconventional directional movement

IF 5.3 2区化学 Q2 CHEMISTRY, PHYSICAL

Journal of Molecular Liquids Pub Date : 2024-11-24 DOI:10.1016/j.molliq.2024.126576

Debopam Bhattacharya , Subhadip Chakraborty , Ditipriya Hazra , Amlan Roychowdhury , Anupam Karmakar , Sanatan Chattopadhyay

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Abstract

Current study investigates the voltage-induced actuation of alcohol droplets on a Teflon/Pt/Glass substrate, emphasizing the influence of alkyl chain length on microfluidic droplet behavior. The wetting and electrowetting properties of different alcohols with increasing carbon chain length, namely, methanol, ethanol, 1-propanol, and 1-butanol, are examined by using both experimental techniques and the simulations of classical molecular dynamics (MD). An increase in the wetting nature of these alcohol droplets is observed with the increase in carbon chain length. A greater penetration into the Teflon surface is observed for alcohols with longer alkyl chain lengths from MD simulations. The evaporative nature of alcohol droplets and the consequent effect of evaporation on wetting are also examined. Voltage-modified change in contact angle, droplet displacement or spreading, and voltage-induced work of spreading, are investigated to study the actuation of such alcohol droplets. A unique, voltage-triggered directional displacement/spreading of the droplets towards ground electrode is observed, in contrast to the conventional electrowetting behavior. These insights underscore the influence of molecular interactions in voltage-actuated droplet dynamics, having significant implications as a design parameter in the development of digital microfluidics-based lab-on-a-chip devices.

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特氟隆/Pt/玻璃基底上烷基链依赖性电压诱导微流体酒精液滴驱动的分子级分析：揭示非常规定向运动

本研究探讨了电压诱导驱动聚四氟乙烯/铂/玻璃基底上的酒精液滴，强调了烷基链长度对微流体液滴行为的影响。通过实验技术和经典分子动力学（MD）模拟，研究了碳链长度增加的不同醇类（即甲醇、乙醇、1-丙醇和 1-丁醇）的润湿性和电润湿性。随着碳链长度的增加，观察到这些酒精液滴的润湿性增强。通过 MD 模拟观察到，烷基链长较长的醇类对特氟龙表面的渗透性更大。此外，还研究了酒精液滴的蒸发性以及蒸发对润湿的影响。通过研究电压调节的接触角变化、液滴位移或扩散以及电压诱导的扩散功，来研究这种酒精液滴的致动。与传统的电润湿行为不同，在电压的触发下，液滴向接地电极发生了独特的定向位移/扩散。这些见解强调了分子相互作用在电压驱动液滴动力学中的影响，对于开发基于数字微流控技术的片上实验室设备的设计参数具有重要意义。

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来源期刊

Journal of Molecular Liquids 化学-物理：原子、分子和化学物理

CiteScore

10.30

自引率

16.70%

发文量

2597

审稿时长

78 days

期刊介绍： The journal includes papers in the following areas: – Simple organic liquids and mixtures – Ionic liquids – Surfactant solutions (including micelles and vesicles) and liquid interfaces – Colloidal solutions and nanoparticles – Thermotropic and lyotropic liquid crystals – Ferrofluids – Water, aqueous solutions and other hydrogen-bonded liquids – Lubricants, polymer solutions and melts – Molten metals and salts – Phase transitions and critical phenomena in liquids and confined fluids – Self assembly in complex liquids.– Biomolecules in solution The emphasis is on the molecular (or microscopic) understanding of particular liquids or liquid systems, especially concerning structure, dynamics and intermolecular forces. The experimental techniques used may include: – Conventional spectroscopy (mid-IR and far-IR, Raman, NMR, etc.) – Non-linear optics and time resolved spectroscopy (psec, fsec, asec, ISRS, etc.) – Light scattering (Rayleigh, Brillouin, PCS, etc.) – Dielectric relaxation – X-ray and neutron scattering and diffraction. Experimental studies, computer simulations (MD or MC) and analytical theory will be considered for publication; papers just reporting experimental results that do not contribute to the understanding of the fundamentals of molecular and ionic liquids will not be accepted. Only papers of a non-routine nature and advancing the field will be considered for publication.