电介质电润湿(EWOD)平台上的胶体液滴干燥。

IF 2.6 4区 工程技术 Q2 BIOCHEMICAL RESEARCH METHODS
Biomicrofluidics Pub Date : 2024-10-02 eCollection Date: 2024-09-01 DOI:10.1063/5.0209815
Udita Uday Ghosh, Trina Dhara, Janesh Bakshi, Kalpita Nath, Sunando DasGupta
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引用次数: 0

摘要

在标准的电介质电润湿配置中,研究了电场对胶体液滴干燥的物理影响,胶体液滴由分散的带负电纳米粒子 [2 μl, 1(w/w. %)]组成。研究发现,蒸发过程中接触线的针化程度是外加电压大小的函数,并以无量纲电润湿数 (η) 进行量化。从干燥胶体膜厚度的表征中可以看出,针状接触线导致更高的颗粒压实度。对裂纹的形成及其动态进行了详细分析,以揭示接触线区域附近和压实前沿的相互作用力。根据外加电场的大小和极性阐明了裂纹形成的这些方面。研究发现,电场会影响裂纹前沿的起始速度、几何形状和裂纹数量,并试图通过基于第一原理的方法来解释这些问题。因此,这项研究表明,可以使用电润湿技术对胶体薄膜的裂纹形成行为进行微调。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Colloidal droplet desiccation on a electrowetting-on-dielectric (EWOD) platform.

The physics of the effects of electric field on the desiccation of colloidal droplets, comprising of dispersed negatively charged nanoparticles [2 μl, 1(w/w. %)], are studied in a standard electrowetting-on-a-dielectric configuration. The extent of contact line pinning during evaporation is found to be a function of the magnitude of the applied voltage and quantified in terms of the dimensionless electrowetting number (η). The pinned contact line led to higher particle compaction as evidenced by the characterization of dried colloidal film thicknesses. Crack formation and their dynamics have been analyzed in detail to elicit the interplay of forces near the contact line region and on the compaction front. These aspects of crack formation are elucidated in the light of magnitude and polarity of the applied electric field. It is found to influence the crack front initiation velocity, the geometry, the number of cracks, and an attempt is made to explain the same via first principle-based approaches. Therefore, this study indicates the possibility of using electrowetting as a technique to fine-tune the crack formation behavior in thin colloidal films.

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来源期刊
Biomicrofluidics
Biomicrofluidics 生物-纳米科技
CiteScore
5.80
自引率
3.10%
发文量
68
审稿时长
1.3 months
期刊介绍: Biomicrofluidics (BMF) is an online-only journal published by AIP Publishing to rapidly disseminate research in fundamental physicochemical mechanisms associated with microfluidic and nanofluidic phenomena. BMF also publishes research in unique microfluidic and nanofluidic techniques for diagnostic, medical, biological, pharmaceutical, environmental, and chemical applications. BMF offers quick publication, multimedia capability, and worldwide circulation among academic, national, and industrial laboratories. With a primary focus on high-quality original research articles, BMF also organizes special sections that help explain and define specific challenges unique to the interdisciplinary field of biomicrofluidics. Microfluidic and nanofluidic actuation (electrokinetics, acoustofluidics, optofluidics, capillary) Liquid Biopsy (microRNA profiling, circulating tumor cell isolation, exosome isolation, circulating tumor DNA quantification) Cell sorting, manipulation, and transfection (di/electrophoresis, magnetic beads, optical traps, electroporation) Molecular Separation and Concentration (isotachophoresis, concentration polarization, di/electrophoresis, magnetic beads, nanoparticles) Cell culture and analysis(single cell assays, stimuli response, stem cell transfection) Genomic and proteomic analysis (rapid gene sequencing, DNA/protein/carbohydrate arrays) Biosensors (immuno-assay, nucleic acid fluorescent assay, colorimetric assay, enzyme amplification, plasmonic and Raman nano-reporter, molecular beacon, FRET, aptamer, nanopore, optical fibers) Biophysical transport and characterization (DNA, single protein, ion channel and membrane dynamics, cell motility and communication mechanisms, electrophysiology, patch clamping). Etc...
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