薄膜

Abstract(#br)A polyethylene (PE) microfiltration membrane with highly ordered and identical straight through-pore microstructure was facilely synthesized via micro-casting. Initially, through embedding the micropillars of silicon micropillar template into a polydimethylsiloxane (PDMS) layer under a press force, we built a micropillar mold cavity (MPMC) and infiltrated PE melt into the cavity by submerging the MPMC into the melt to perforate the PE thin film. Then after a release of the PDMS layer, the solidified PE membrane was peeled off from the template.

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.

Scratch resistance and friction are core properties which define the tribological characteristics of materials. Attempts to optimize these quantities at solid surfaces are the subject of intense technological interest. The capability to modulate these surface properties while preserving both the bulk properties of the materials and a well-defined, constant chemical composition of the surface is particularly attractive. We report herein the use of a soft, flexible underlayer to control the scratch resistance of oxide surfaces.

文摘本研究揭示了在聚二甲基硅氧烷( PDMS )衬底上磁控溅射沉积Al薄膜在高温下的两阶段起皱行为。在Al薄膜中形成了具有纳米微双尺度皱纹的层次结构。微尺度皱纹起源于热收缩，波长随着膜厚的增加而增加，而纳米尺度皱纹则是由PDMS表面混合层的膨胀诱导产生的，波长几乎不变。该结果为功能层次化皱纹表面的生成提供了一种简便的方法. . .图解摘要[ Display省略]

We have developed a modified-creep experiment with nanoindenter to measure the viscoelastic properties of elastomer films. Load-controlled experiments on PDMS (polydimethylsiloxane) films were performed using the Nano Indenter\n\t\t\t\t\t\t® XP with a flat-ended tip. By adapting the force–depth relation obtained by Choi et al. [S.T. Choi, S.R. Lee, Y.Y. Earmme, Acta Mater. (submitted for publication)], the indentation results were analyzed to obtain the relaxation modulus of the PDMS film as a function of time.

This paper presents a microfabricated Clark-type sensor which exactly can measure dissolved oxygen in the cell containing solution. We designed, fabricated, and characterized a microfabircated Clark-type oxygen sensor for measuring dissolved oxygen. The microfabricated oxygen sensor consists of 3-electrodes on a glass substrate, a FEP (Fluorinated ethylene propylene) oxygen-permeable membrane, and PDMS (Polydimethylsiloxane) reservoir for storing sample solution.

采用Ni-Zr合金薄膜氢敏传感器、柔性、Ni-Zr、PDMS、薄膜，通过旋涂和直流磁控溅射制备了三层$PMMA/Ni_{64}Zr_{36}/PDMS$型氢敏传感器。PDMS (聚二甲基硅氧烷)作为柔性基底，PMMA (聚甲基丙烯酸甲酯)薄膜沉积在$Ni_{64}Zr_{36}$合金层上，赋予传感器较高的氢选择性。所制备的传感器在高氢浓度( 99.9 % )下的氢传感能力和响应时间均表现出20 %的电阻变化，优于常规Pd基氢传感器，难以在高氢浓度环境下使用。在氢气浓度为5 %时，电的电阻约为1.4 %，这是一种类似于$Pd_{77}Ag_{23}$传感器的电阻。尽管采用低成本的$Ni_{64}Zr_{36}$合金作为主要传感元件，但在高浓氢气气氛下仍能获得与现有Pd传感器类似的性能。通过优化包括各层厚度和Ni-Zr合金薄膜成分的氢检测灵敏度，提出的Ni-Zr基氢传感器可以替代Pd基氢传感器。

摘要\n本研究针对0 ~ 1.5NaY分子筛wt %的薄膜，制备了聚二甲基硅氧烷( PDMS )和NaY分子筛掺杂复合膜。所有膜均采用衰减全反射傅里叶变换红外光谱( FTIR )、X射线衍射、扫描电镜、热重/差热分析等方法进行表征。FTIR光谱结果表明，PDMS基体与NaY分子筛之间存在物理相互作用。此外，利用光子传输技术研究了纯PDMS和PDMS / NaY复合材料的成膜情况。计算了空穴闭合和互扩散阶段对应的激活能。NaY沸石添加薄膜导致力学性能显著提高，拉伸强度和杨氏模量均提高了3倍。还考察了薄膜的热性能，在PDMS基体中加入NaY分子筛可显著提高复合膜的热稳定性。J . Appl . Polym。Sci . 2020、137、48549。

摘要 具有紫外/近红外( UV / NIR )屏蔽性能的纳米材料在节能窗方面具有巨大的发展潜力。本文报道了一种低成本的W18O49纳米棒作为紫外/近红外屏蔽材料。采用简单的溶剂热法制备了W18O49纳米棒，其长度为~ 20或~ 60nm，在紫外/近红外区表现出较强的尺寸依赖性吸收。将W18O49纳米棒与聚二甲基硅氧烷( PDMS )共混，制备了W18O49 @ PDMS薄膜，在透射可见光58.03 %的同时，屏蔽了55.58 %的紫外光和75.89 %的近红外光。在太阳光( 0.6W cm-2 )照射下，以W18O49 @ PDMS涂层玻璃为窗口的密封盒，与纯玻璃(△T = 18.2℃)或ITO玻璃(△T = 12.1℃)相比，温度升幅最小(△T = 9.2℃)。薄膜接触角为122±2°，具有自清洁能力。因此，W18O49 @ PDMS薄膜可以作为低成本的UV / NIR屏蔽和自清洁薄膜。