PDMS

采用三维( 3D )打印的流体芯片制造技术近来受到广泛关注。在此，我们描述了一种利用3D打印的聚乙烯醇( PVA )或丙烯腈-丁二烯-苯乙烯( ABS )模板和聚合物涂层制备聚二甲基硅氧烷( PDMS )流体芯片的新方法。该方法在3D打印模板上涂复聚乙二醇( PEG )。将此涂层模板浸入液体PDMS中，随后将PDMS固化。通过从通道中移除这种液体PEG，可以在模板和PDMS之间创建空间。这个空间使模板的去除更容易。用溶剂溶解模板形成流路。这些PDMS芯片用于流动注射测量。

本文报道了一种由PDMS (聚二甲基硅氧烷)微腔、金属电极、驻极体板组成的新型能量采集器装置液室单元。在微流体腔中，由于气-液界面介电常数的变化，K掺杂到氧化硅层中，形成驻极体中的固定电荷并极化产生电能。我们预见心跳作为外部振动源，将液体泵入液细胞单元中。可以产生电流给肌萎缩侧索硬化症的膈肌节拍器等小型植入式医用电子充电。

AbstractThe polymer polydimethylsiloxane (PDMS) is widely used to build microfluidic devices compatible with cell culture. Whilst convenient in manufacture, PDMS has the disadvantage that it can absorb small molecules such as drugs. In microfluidic devices like “Organs-on-Chip”, designed to examine cell behavior and test the effects of drugs, this might impact drug bioavailability. Here we developed an assay to compare the absorption of a test set of four cardiac drugs by PDMS based on measuring the residual non-absorbed compound by High Pressure Liquid Chromatography (HPLC).

Electrospinning technique was used to convert polydimethyl siloxane (PDMS) sol-gel solution to a new nanostructure on a stainless steel wire. The surface morphology of the fiber was observed by scanning electron microscopy (SEM). It showed a diameter range of 30-60nm for PDMS nanoparticles with a homogeneous and porous surface structure. The applicability of this coating was assessed for the headspace SPME (HS-SPME) of benzene, toluene, ethylbenzene and xylenes (BTEX) from water samples followed by gas chromatography-mass spectrometry.

AbstractThis paper introduces a compact mechanical stimulation device suitable for applications to study cellular mechanobiology. The pneumatically controlled device provides equiaxial strain for cells on a coated polydimethylsiloxane (PDMS) membrane and enables real time observation of cells with an inverted microscope. This study presents the implementation and operation principles of the device and characterizes membrane stretching. Different coating materials are also analyzed on an unstretched membrane to optimize the cell attachment on PDMS.

Abstract\n\t\t\t\t\n\t\t\t\t\tThe introduction of liquid crystals (LCs) has presented an interesting approach to improving gas separation properties in polymeric membranes. A novel polydimethylsiloxane (PDMS)/LC cross-linked membrane was prepared with PDMS containing vinyl groups and LCs containing unsaturated linkages as matrix materials. The chemical structures and LC properties were characterized with FTIR, DSC and thermal polarized optical microscopy. Some influential factors that affect the permeability and transport properties were also studied.

We report a facile and efficient method to transfer the graphene from a metal substrate to a polymer without removal of the metal substrate. Multilayer graphene was synthesized on a Co substrate, and liquid polydimethylsiloxane (PDMS) was prepared using various curing agent ratios. The quantity of graphene transferred to the cured PDMS could be controlled by the mixing ratio of the curing agent. We produced monolayer graphene on a metal substrate and controlled the transfer of graphene layers to PDMS.

Abstract\n\t\t\t\t\n\t\t\t\t\tA novel, miniaturized, high-efficiency photocatalytic cell, able to work in dynamic conditions, has been designed and validated in this study. Microfluidic channels were molded out of polydimethylsiloxane (PDMS) by means of standard soft lithography techniques, so as to work as photocatalytic cells, where the coupling of anatase titanium dioxide thin films and platinum electrodes, allows an electrically assisted photocatalytic reaction to produce dissolved oxygen gas from the water content of flowing fluid (e.g. blood).

Organophosphorus pesticides (OPPs), widely known as persistent organic pollutants, are the most popular contaminants in agriculture products in developing countries. The determination of OPPs in complex matrices, such as food, environmental and biological samples, usually requires extensive sample pretreatment. This review focuses on the sorptive extraction techniques applied as sample pretreatment for OPPs in complex matrices, including solid-phase extraction (SPE) and solid-phase microextraction (SPME).