聚二甲基硅氧烷

Abstract(#br)Phenol removal and recovery from wastewaters are highly demanded in industries due to its high toxicity and industrial importance. It can transport through the silicon-based rubber polydimethylsiloxane (PDMS) via the solution-diffusion mechanism. To improve the phenol removal efficiency in extractive processes, dense PDMS membranes with different macromolecular structures have been developed and evaluated in this work.

Abstract(#br)In the current study, the AF properties of carbon nanotubes (CNTs)-modified polydimethylsiloxane (PDMS) nanocomposites were examined via the field assays. The impact of the CNTs incorporated in PDMS on the biological colonization and successional dynamics of the pioneer natural biofilm communities was investigated using the single-stranded conformation polymorphism (SSCP) technique.

Abstract(#br)Grafting single end-tethered polymer chains on the surface of graphene is a conventional way to modify the surface properties of graphene oxide. However, grafting arc-like macromolecular bridges on graphene surfaces has been barely reported. Herein, a novel arc-like polydimethylsiloxane (PDMS) macromolecular bridges grafted graphene sheets (GO -g-Arc PDMS) was successfully synthesized via a confined interface reaction at 90 °C.

Abstract(#br)In this study, rapid and direct Raman analysis of microalgae was demonstrated through measurement of algal cells (or algal paste) prepared by microwell-assisted filtration using an anodic aluminum oxide (AAO) membrane. To obtain the algal paste, an array of polydimethylsiloxane (PDMS) microwells with through holes was placed on top of the AAO membrane, after which a vacuum was initiated and a droplet of algal solution dispensed inside the PDMS microwells for a 5-min filtration process.

Abstract(#br)Novel bio-inspired materials derived from crystalline nanocellulose (CNC) have been tested as wood consolidants. A suspension of CNC, produced by acid hydrolysis of cellulose and used as such or mixed with lignin and/or siloxane derivatives (PDMS), was applied on rotted wood samples of Norway spruce. X-Ray diffraction analysis on CNC powder showed high crystallinity index. Dynamic light scattering (DLS) measurement indicated a nearly uniform particle size distribution with an average hydrodynamic diameter for pure CNC smaller than that in the mixtures.

Abstract(#br)A highly-efficient zeolitic imidazolate framework-8 (ZIF-8) embedded polydimethylsiloxane (PDMS) mixed matrix membrane (MMM) supported by a polyvinylidene fluoride (PVDF) nanofibrous substrate was developed for phenol removal in an aqueous-aqueous membrane extractive process.

摘要细胞牵引力的定量方法很多，包括牵引力显微镜和微加工的柱阵列。然而，这些方法都存在局限性，包括需要去除细胞来确定未被选中的颗粒位置，以及无法分别量化细胞骨架刚度较低的细胞所受的力。这里我们提出了一种新颖的牵引力量化方法，消除了这两种局限性。通过使用六边形的微接触印刷蛋白质点图案、一种新的计算算法和聚二甲基硅氧烷( PDMS )共混物的薄表面，我们演示了一个系统：·在稳定且易于制造的均匀表面上量化细胞力。·利用六边形的蛋白质点图案和计算几何来量化细胞力，而不需要细胞去除。·在细胞骨架结构刚度较低的细胞上量化细胞力。

摘要\n在35℃下，CO2 - CH4混合物在聚二甲基硅氧烷( PDMS )中的混合气体吸附表明，CH4的存在改变了CO2的吸附行为，反之亦然。这种相互作用表明混合气体中的气体在橡胶膜中并不独立吸附。此外，我们还观察到在增加压力时，PDMS与CO2 - CH4混合物的相互作用增强了PDMS的溶解选择性。CH4在PDMS中的混合气体溶解度系数小于0.5cm3 ( STP ) cm-3 atm-1。为了准确测量这些值，本文还针对低溶解度系数设计、构建和优化了新的吸附体系，并探讨了操作方便的混合气体吸附实验方法。利用Maxwell-Stefan模型拟合混合气体的渗透和吸附数据，计算了CO2 - CH4混合气体的扩散趋势。对混合气体扩散和吸附数据的分析表明，PDMS的CO2 / CH4混合气体选择性主要受CO2吸附的影响。在混合气体中，CH4扩散系数随体积CO2浓度增大而增大，而纯气体和混合气体环境中，CO2扩散系数基本上与浓度无关。

摘要\n制备了垂直排列( VA )和开放式碳纳米管( CNT )阵列填充聚二甲基硅氧烷( PDMS )复合膜，并对丙酮-丁醇-乙醇( ABE )发酵液中丁醇的渗透汽化回收进行了表征和评价。与均相PDMS膜相比，VA CNT ( open-end ) / PDMS膜表现出了各种优势，因为VA CNT ( open-end ) / PDMS膜表现出了同时提高丁醇通量和分离因子的作用，这是该膜较高的丁醇溶解度和扩散率的结果。丁醇通量和分离因子均随进料温度( 30 ~ 80℃)和进料丁醇浓度( 5 ~ 25g / L )的增加而急剧增大，80℃时VA CNT / PDMS膜的最大总通量和丁醇分离因子分别达到1093.7g / m2h和37.6。复合膜表现出稳定的性能，与发酵液长期连续运行，用于生物丁醇生产。总体而言，VA CNT ( open-ended ) / PDMS膜比均相PDMS膜具有更高的丁醇通量和选择性，在ABE发酵分离丁醇方面潜力。

Abstract(#br)Reflection of electromagnetic waves at multiple interfaces and then absorption in the matrices has been well demonstrated to efficiently improve electromagnetic interference (EMI) shielding of conductive polymer composites (CPC). In this study, a large number of multiple interfaces were constructed in polydimethylsiloxane/multi-walled carbon nanotubes (PDMS/MWCNT) nanocomposites by the incorporation of cotton fibers (CTF).