剥离

Abstract(#br)The effect of addition of small amounts of stearic acid on the adhesive properties of polydimethylsiloxane (PDMS) was investigated. Stearic acid reduced the peel strength of bonded aluminium samples with the joint weakening effect increasing with increased loadings. Surface analysis of the peeled surfaces was carried out using XPS, SSIMS and FTIR. This showed that stearic acid did not form a weak boundary layer at the metal–polymer interface as would traditionally be expected.

Abstract(#br)PDMS (Polydimethylsiloxane) thin films are widely used in stretchable electronics. However, it still remains challenging to fabricate PDMS thin films in an easy and convenient manner. To address this issue, here we novelly present an approach to ease the fabrication of PDMS membranes using lift-off method. For application as substrates in flexible biosensors, a gold thin film has been deposited on the PDMS thin film. The reliability of electric conductivity has been investigated. Moreover, biocompatibility of the PDMS thin film has been tested by culturing HeLa live cells it.

弹性体，特别是聚二甲基硅氧烷( PDMS )被广泛用作生物相容的机械柔顺基底，用于医学、生物和工程中柔软灵活的微纳系统。然而，一些应用需要很低的厚度(例如\u003c 100μm )，这使得剥离非常关键，因为很薄的弹性体变得细腻并且倾向于与载体表现出强的附着力。此外，光刻等微细加工技术使用溶胀PDMS的溶剂，引入复杂性和可能的污染，从而限制了工业可伸缩性，阻碍了许多生物医学应用。在此，我们将低附着力和矩形载体基板、粘合Kapton框架、微铣削定义的阴影掩膜和粘合中和纸框架结合起来，实现了快速、简单、绿色、无污染和可扩展的薄弹性体器件制造，同时简化了剥离和搬运。通过在低附着载体背侧微磨划线，可以进一步方便框架与阴影掩模之间的精确对准。作为概念的证明，我们在50μm厚的PDMS基底上展示表皮传感器用于测量应变、皮肤生物阻抗和心率。所提出的方法为在弹性体上直接、绿色和可扩展地制造无污染物的薄器件铺平了道路，可广泛应用。

用H2 SO4和H2 O2的混合物(称为piranha溶液)从多层板MFI沸石( ML- MFI )中除去有机结构导向剂( OSDA )。通过在水中超声剥离无OSDA的ML-MFI沸石，经沉淀纯化得到MFI沸石纳米片水溶液。采用X射线衍射( XRD )、扫描电镜( SEM )、透射电镜( TEM )和低温N2吸附-脱附测孔等多种技术对剥离后的MFI沸石纳米片进行了表征，表明得到了单层MFI沸石纳米片，微孔被打开。以开孔MFI沸石纳米片为填料，PDMS为连续相，采用溶液浇铸法制备了MFI纳米片/ PDMS混合基质膜( MMMs )。与纯PDMS膜相比，所得MMMs对正丁烷在i-丁烷上的丁烷异构体渗透率和选择性均有较大提高。当MFI纳米片负载量为1   wt %时，MMM对正丁烷/异丁烷的选择性达到15.7，正丁烷渗透率可达15615 Barrer。