聚二甲基硅氧烷

文摘( # br )通过亲水丙烯酰胺单体和疏水PDMS-IPDI-HEMA大分子单体在水溶液中的胶束共聚合反应，设计并制备了一种具有可调透氧性的新型聚二甲基硅氧烷( PDMS )水凝胶。对制备的水凝胶的形貌、化学成分和透氧性( Dk )进行了研究，并验证了其透氧性随着PDMS - IPDI - HEMA含量的增加而逐渐增加。因此，本工作为用环境友好的方法生产一类不使用有机溶剂的含有PDMS的水凝胶开辟了新的途径。

摘要\n本研究通过在氧化石墨烯( GO )纳米片表面原位生长沸石咪唑酸骨架8 ( ZIF-8 )纳米粒子，制备了具有连续内通道的ZIF-8 @ GO乙醇分子复合材料，并填充到聚二甲基硅氧烷( PDMS )基体中，制备了PDMS / ZIF-8 @ GO混合基质膜( MMMs )，用于渗透蒸发回收乙醇。采用多种技术对所制备的ZIF-8 @ GO复合材料和PDMS / ZIF-8 @ GO MMMs进行了表征。结果表明，ZIF-8纳米粒子均匀分散在GO纳米片表面，ZIF-8 @ GO复合材料的疏水性比GO强，这是由于ZIF-8疏水性对GO进行表面修饰。而且，ZIF-8 @ GO复合材料作为填料不仅与PDMS表现出优异的相容性，而且与ZIF-8纳米粒子相比，在PDMS基体中表现出良好的分散性。因此，ZIF-8 @ GO基MMMs比ZIF-8基MMMs表现出更好的分离性能。通过调节填料种类、颗粒负荷、膜厚和进料温度，研究了PDMS / ZIF-8 @ GO MMMs的渗透蒸发性能。优化后的PDMS / ZIF-8 @ GO MMMs与5 wt %乙醇水溶液在40℃下，总通量为443.8 g / m2 h，分离因子为22.2，与大多数PDMS基MMMs相比，渗透汽化性能更优。优异的渗透汽化结果归因于GO纳米片作为强阻隔剂与具有连续内通道的疏水ZIF-8纳米粒子的协同作用。

摘要\n联苯基共价三嗪骨架( CTF )粒子作为一类新型的有机多孔材料，被掺入聚二甲基硅氧烷( PDMS )中，制备了用于正丁醇( n- BtOH )回收的高性能渗透汽化膜。增加CTF的负载量显著提高了膜的通量和分离因子。这是由于CTF的强疏水性、高孔性和介孔结构为n- BtOH提供了高透水性和择优性的通道，重要的是，与其他报道的含常规微孔粒子的PDMS基混合基质膜相比，CTF / PDMS ( CTF / PDMS )膜具有更高的通量和更好的分离因子。提高进料温度和n- BtOH浓度进一步增强了渗透汽化性能。因此，将含12.5 wt % CTF的CTF / PDMS膜与4 wt %的n- BtOH进料液在60℃下操作时，n- BtOH的回收率最高(总渗透通量2816±118 g m-2 h-1，分离因子62.8±1.5，渗透n- BtOH浓度71.5±2.7 wt % )。

The goal of this study was to create polydimethylsiloxane (PDMS) and microcrystalline cellulose (MCC) composites with high mechanical properties and antimicrobial activity. Vinyl-terminated PDMS was mixed with bifunctional filler, which combines MCC stiffness and antimicrobial properties of silver nanoparticles. To provide antimicrobial properties the silver nanoparticles in situ were synthesized by chemical reducing method in MCC aqueous suspension. Silver nanoparticles (AgNPs) concentration deposited on MCC particles surface was varied.

In this paper we present various pneumatically actuated microfluidic valves to enable user-defined fluid management within a microfluidic chip. To identify a feasible valve design, certain valve concepts are simulated in ANSYS to investigate the pressure dependent opening and closing characteristics of each design. The results are verified in a series of tests. Both the microfluidic layer and the pneumatic layer are realized by means of soft-lithographic techniques. In this way, a network of channels is fabricated in photoresist as a molding master.

A miniature quartz crystal microbalance (mQCM) was integrated with a polydimethylsiloxane (PDMS) microfluidic device for on-chip determination of amyloid polypeptide–Aβ42. The integration techniques included photolithography and plasma coupling. Aβ42 antibody was immobilized on the mQCM surface using a cross-linker method, and the resonance frequency of mQCM shifted negatively due to antibody-antigen binding. A linear range from 0.1 µM to 3.2 µM was achieved.

Transparent, hydrophobic hybrid films were deposited on glass substrate from solution containing hydroxyl-terminatedpolydimethylsiloxane (PDMS) and TiO2 sol by using a dip coating method. The effects of the film heat-treatment temperatureand PDMS/TiO2 component on surface properties of the hybrid films were investigated by water drop contact angle measurement,and by atomic force microscopy (AFM) and scanning electron microscope (SEM) analyses.

Transparent, hydrophobic hybrid films were deposited on glass substrate from solution containing hydroxyl-terminatedpolydimethylsiloxane (PDMS) and TiO2 sol by using a dip coating method. The effects of the film heat-treatment temperatureand PDMS/TiO2 component on surface properties of the hybrid films were investigated by water drop contact angle measurement,and by atomic force microscopy (AFM) and scanning electron microscope (SEM) analyses.

ZnO nanowires are normally exposed to an oxygen atmosphere to achieve high performance in UV photodetection. In this work we present results on a UV photodetector fabricated using a flexible ZnO nanowire sheet embedded in polydimethylsiloxane (PDMS), a gas-permeable polymer, showing reproducible UV photoresponse and enhanced photoconduction. PDMS coating results in a reduced response speed compared to that of a ZnO nanowire film in air. The rising speed is slightly reduced, while the decay time is prolonged by about a factor of four.

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