Generating nano/microliter droplets with on-demand repetition rates by femtosecond filament-fabricated superhydrophobic bevel needle nozzles

IF 8.3 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

ACS Applied Materials & Interfaces Pub Date : 2024-09-29 DOI:10.1016/j.surfin.2024.105169

Liansheng Zheng , Hongwei Zang , Dingdi Wang , Yingbo Cong , Bin Gao , Shuo Wang , Huailiang Xu

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Abstract

Nano- and micro-droplets provide a platform for microanalysis of a variety of biochemical reactions with less consumption of reagents and large-extent elimination of cross-contamination, but stable generation of such monodisperse droplets with an on-demand size and repetition rate should be first established. Here, we present a simple and robust approach to generate nano/microliter (nL/μL) droplets with predetermined size and repetition rate by using femtosecond laser filament-fabricated stainless bevel needle nozzles (BNNs). We demonstrate that hierarchically heterogeneous micro/nanostructures can be directly formed on both the inner and outer surfaces of BNNs by femtosecond laser filament processing, and that after a heat treatment the fabricated BNNs show an excellent superhydrophobic property with the water contact angle of ∼160° and the rolling-off angle of ∼0.4°. With the superhydrophobic BNNs (19–27 gauge), we produce monodisperse water droplets (2.5 μL–87 nL) with nearly the same sizes as the needle diameters, and dispense them repeatedly with on-demand repetition rates from sub-1 Hz to more than 100 Hz over several orders of the flow rate. The results provide a new way for generating microdroplets on demand for various droplet-based applications.

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用飞秒长丝制造的超疏水斜面针形喷嘴按需产生纳升/微升液滴

纳米和微液滴为各种生化反应的显微分析提供了一个平台，同时减少了试剂消耗，并在很大程度上避免了交叉污染，但这种按需大小和重复率的单分散液滴的稳定生成需要先行建立。在此，我们提出了一种简单而稳健的方法，利用飞秒激光灯丝制造的不锈钢斜面针形喷嘴（BNN）生成具有预定大小和重复率的纳米/微升（nL/μL）液滴。我们证明，通过飞秒激光灯丝加工，可以在 BNNs 的内外表面直接形成分层异质微/纳米结构，经过热处理后，制造出的 BNNs 具有优异的超疏水性能，水接触角为 ∼ 160°，滚落角为 ∼ 0.4°。利用超疏水 BNN（19-27 号），我们产生了与针直径大小几乎相同的单分散水滴（2.5 μL-87 nL），并以低于 1 Hz 到超过 100 Hz 的按需重复率在几个数量级的流速范围内反复喷洒这些水滴。这些结果为各种基于液滴的应用提供了一种按需生成微液滴的新方法。

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来源期刊

ACS Applied Materials & Interfaces 工程技术-材料科学：综合

CiteScore

16.00

自引率

6.30%

发文量

4978

审稿时长

1.8 months

期刊介绍： ACS Applied Materials & Interfaces is a leading interdisciplinary journal that brings together chemists, engineers, physicists, and biologists to explore the development and utilization of newly-discovered materials and interfacial processes for specific applications. Our journal has experienced remarkable growth since its establishment in 2009, both in terms of the number of articles published and the impact of the research showcased. We are proud to foster a truly global community, with the majority of published articles originating from outside the United States, reflecting the rapid growth of applied research worldwide.