Morphing out-of-surface channels enable strain-based control over fluid flow in skin-mountable patches

IF 5.4 2区 工程技术 Q1 BIOCHEMICAL RESEARCH METHODS
Lab on a Chip Pub Date : 2025-08-15 DOI:10.1039/D5LC00417A
Rana Altay, Hudson Gasvoda, Max Mailloux-Beauchemin, Johanna Brown, Kari Olson and I. Emre Araci
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Abstract

The volume of natural materials increases under tension, thus conventionally biomechanical actuation of fluidic pumps relies on compression for pressure generation. Here, we report on out-of-surface microchannels (OSMiCs) that exhibit negative volumetric strain (i.e., pressure generation) under skin-induced tensile strain. Monolithic polydimethylsiloxane (PDMS) patches were fabricated and characterized. The complex relations between the wrinkling and buckling of the OSMiC shell and the fluid flow patterns were investigated. OSMiCs were shown to snap-back (-through) between two stable states that lead to (ir)reversible fluid flow depending on their architecture. Unlike standard microchannels that only generate pressure symmetrically upon application and release of tensile strain, OSMiCs are shown to be tunable for providing an asymmetrical pressure owing to their shape-change property (i.e., morphing). The maximum forward (backward) flow pressure of 10 (−14) kPa was measured upon 20% uniaxial strain application (release). The versatile fabrication technique allowed the integration of OSMiCs with different Q values, leading to a discrete strain-actuated flow control element. Numerical simulations were conducted and shown to support the experimentally observed wrinkling and buckling behavior. Finally, the operation of the power-free OSMiC skin patch for strain-based liquid administration on skin was demonstrated.

Abstract Image

变形的表面外通道可以基于应变控制皮肤贴片中的流体流动
天然材料的体积在张力作用下增加,因此传统的生物力学驱动流体泵依赖于压缩来产生压力。在这里,我们报道了在皮肤诱导的拉伸应变下表现出负体积应变(即压力产生)的表面外微通道(OSMiCs)。制备了单片聚二甲基硅氧烷(PDMS)贴片并对其进行了表征。研究了OSMiC壳的起皱和屈曲与流体流型之间的复杂关系。osmic被证明可以在两种稳定状态之间快速恢复(通过),根据其结构导致(ir)可逆流体流动。与标准微通道不同,标准微通道只能在施加和释放拉伸应变时对称地产生压力,osmic由于其形状变化特性(即变形)而被证明可以提供不对称的压力。在20%单轴应变施加(释放)时,测得最大前(后)流压力为15 (-20)kPa。多功能制造技术允许集成具有不同Q值的osmic,从而形成离散应变驱动的流量控制元件。数值模拟结果与实验观察到的起皱和屈曲行为一致。最后,演示了无功率OSMiC皮肤贴片用于基于菌株的皮肤给药的操作。
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来源期刊
Lab on a Chip
Lab on a Chip 工程技术-化学综合
CiteScore
11.10
自引率
8.20%
发文量
434
审稿时长
2.6 months
期刊介绍: Lab on a Chip is the premiere journal that publishes cutting-edge research in the field of miniaturization. By their very nature, microfluidic/nanofluidic/miniaturized systems are at the intersection of disciplines, spanning fundamental research to high-end application, which is reflected by the broad readership of the journal. Lab on a Chip publishes two types of papers on original research: full-length research papers and communications. Papers should demonstrate innovations, which can come from technical advancements or applications addressing pressing needs in globally important areas. The journal also publishes Comments, Reviews, and Perspectives.
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