Effect of thermal treatment on the chemical resistance of polydimethylsiloxane for microfluidic devices
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Abstract:
We investigated the use of thermally treated polydimethylsiloxane (PDMS) for chemically-resistant microchannels. When the PDMS underwent the thermal treatment at 300 °C, swelling was reduced and the surface of the PDMS microfluidic channel endured well in the extracting media such as dichloromethane. Furthermore, despite the small decrease in size after thermal treatment, both the channel shape and transparency were maintained without showing fluid leakage. The thermally treated PDMS had more hydrophilic properties compared to the untreated PDMS. A single step post-casting process described in this work does not require complex chemical treatments or introduction of foreign materials to the host PDMS substrate, thus expanding the application area of PDMS-based microfluidics.Keywords:
Polydimethylsiloxane
Chemical resistance
Polydimethylsiloxane
Quartz Crystal Microbalance
Chemical resistance
PDMS stamp
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본 연구에서는 계면활성제를 첨가한 사각 PDMS(polydimethylsiloxane) 마이크로 채널에서의 모세관 흐름에 의한 충전 길이를 예측하기 위한 모델들을 제안하였다. 일반적으로 PDMS 의 소수성 특성 때문에 모세관 힘만을 이용한 PDMS 마이크로 채널에서의 물의 이동에는 어려움이 따르게 된다. 따라서 본 연구에서는 계면활성제를 첨가하여 친수성을 가지는 PDMS 표면을 제작하고, 이 표면에서의 물의 접촉 각 변화 측정 및 단순 모델을 수립하였다. 또한 친수성 PDMS 마이크로 채널에서의 모세관 힘에 따른 충전 길이를 예측하기 위해서 Washburn 방정식을 바탕으로 한 단순 모델을 수립하였다. 그 결과 유체의 충전 길이는 접촉각의 초기변화속도의 영향을 받는 것을 확인할 수 있었다. 이를 바탕으로 대표적인 세 가지 경우에 대한 모델을 제안하였으며, 이들은 MIMIC(MIcroMolding In Capillaries)과 같은 마이크로 유체 기반의 생산공정의 설계와 개발에 유용하게 적용될 수 있을 것이다.
Polydimethylsiloxane
PDMS stamp
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The current modification of polydimethylsiloxane (PDMS) substrates via oxygen plasma treatment causes surface cracks. Here, we demonstrate a method to prevent crack formation by chemical treatment. Chemical modification renders the surface hydrophilic for several days and is effective in preserving the elasticity of the PDMS surface at the nanoscale level.
Polydimethylsiloxane
Surface Modification
Chemical modification
Elasticity
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我们建议了制作在这的 microfluidic 薄片聚合物主人模子糊的 polydimethylsiloxane (PDMS ) 的一个新奇方法。方法主要包括二步。首先，不锈钢片是蚀刻形成一个金属模型的激光。然后，器官的解决方案(甲基 methacrylate )(PMMA ) poly 是 casted 到金属模型上制作将随后被用来制作 PDMS 芯片的 PMMA 主人。我们系统地研究了影响 microchannels 的表面地位的不同激光参数并且获得了优化蚀刻的参数。当扔的薄片掌握时，我们调查了并且优化，并且开发了一个方法用二个不同粘性答案形成好聚合物主人接着扔模型，并且学习可重复的复制 PMMA 的器官的答案作文。然后，我们调查了这块芯片的物理性能并且由分析玫瑰精 B 评估了有实行可能。与现在的方法相比，建议方法不在 photoresistant 并且化学蚀刻上需要影印石版术。全部制作进步简单，快便宜并且能容易被控制。仅仅几分钟被要求为 PDMS 薄片做一个金属模型，为一位 PMMA 主人的 3 个小时，和一天。
Polydimethylsiloxane
PDMS stamp
Microfluidic chip
Polymethyl methacrylate
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Polydimethylsiloxane is a translucent and biologically inert silicone material used in sealants, biomedical implants and microscale lab-on-a-chip devices. Furthermore, in membrane technology, polydimethylsiloxane represents a material for separation barriers as it has high permeabilities for various gases. The facile handling of two component formulations with a silicone base material, a catalyst and a small molecular weight crosslinker makes it widely applicable for soft-lithographic replication of two-dimensional device geometries, such as microfluidic chips or micro-contact stamps. Here, we develop a new technique to directly print polydimethylsiloxane in a rapid prototyping device, circumventing the need for masks or sacrificial mold production. We create a three-dimensional polydimethylsiloxane membrane for gas–liquid-contacting based on a Schwarz-P triple-periodic minimal-surface, which is inaccessible with common machining techniques. Direct 3D-printing of polydimethylsiloxane enables rapid production of novel chip geometries for a manifold of lab-on-a-chip applications.
Polydimethylsiloxane
Microscale chemistry
Soft Lithography
Rapid Prototyping
PDMS stamp
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Polydimethylsiloxane
Microscale chemistry
Microreactor
PDMS stamp
Microchannel
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A procedure is described for making layer-to-layer interconnections in polydimethylsiloxane (PDMS) microfluidic devices. Thin (∼50 μm) perforated PDMS membranes are bonded to thicker (0.1 cm or more) PDMS slabs by means of thermally cured PDMS prepolymer to form a three-dimensional (3D) channel structure, which may contain channel or valve arrays that can pass over and under one another. Devices containing as many as two slabs and three perforated membranes are demonstrated. We also present 3D PDMS microfluidic devices for display and for liquid dispensing.
Polydimethylsiloxane
PDMS stamp
Prepolymer
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The aim of the project was to modify polydimethylsiloxane (PDMS) surfaces in order to minimize adsorption of proteins. PDMS is used in micro-fluidic devices that control the delivery of samples to ...
Polydimethylsiloxane
Fluidics
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There has been an increase in the use of primary reference material as a standard for identifying the cellular response to biomaterials. One such material is NHLBI-DTB polydimethylsiloxane (PDMS). The PDMS was developed for blood contacting studies and is composed of PDMS backed on one side with mylar. The results of implantation studies of two different publications are discussed in light of the different materials and different surface topographies of each of the materials. The appropriateness of in vivo studies using this reference material is questioned.
Polydimethylsiloxane
Primary (astronomy)
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In this work a two-part polydimethylsiloxane (PDMS) ink has been developed, printed individually, and cured. The successful printing of PDMS has been used to fabricate complex 3D geometry for the first time using FRIJP.
Polydimethylsiloxane
Inkjet Printing
3d printed
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Citations (55)