FTIR

Abstract(#br)Superhydrophobic surfaces based on ZnO–PDMS nanocomposite coatings are demonstrated by a simple, facile, time-saving, wet chemical route. ZnO nanopowders with average particle size of 14\u003cce:hsp sp=\"0.25\"/\u003enm were synthesized by a low temperature solution combustion method. Powder X-ray diffraction results confirm that the nanopowders exhibit hexagonal wurtzite structure and belong to space group P 63 mc .

Abstract(#br)This paper describes rapid, simple, and cost-effective treatments for producing biocompatible and long-term hydrophilic polydimethylsiloxane (PDMS) surfaces identified in an experimental study investigating 39 treatments in all. The wetting of the surfaces was monitored during six months. Changes in surface morphology and chemical composition were also analyzed. Some of the treatments are presented here for the first time, while for earlier presented treatments the selection of investigated parameters was wider and the observation period for the surface wetting longer.

Abstract(#br)Due to the absence of a significant chromophore, Simethicone raw material and finished product analysis is achieved using a FTIR-based method that quantifies the polydimethylsiloxane (PDMS) component of the active ingredient. The method can be found in the USP monographs for several dosage forms of Simethicone-containing pharmaceutical products. For soft gelatin capsules, the PDMS assay values determined using the procedure described in the USP method were variable (%RSDs from 2 to 9%) and often lower than expected based on raw material values.

Abstract(#br)The objective of this work is enhancing the clearcoat resistance against simulated tree gum (Arabic gum) using surface active additives including hydroxyl-functional polydimethyl siloxane (PDMS) and hydroxyl-functional silicone polyacrylate which are able to reduce gum adhesion to the clearcoat surface by reducing its surface free energy and work of adhesion. Using a contact angle measuring device, the surface free energy, contact angle and work of adhesion were obtained.

用于制作片上器官( OOC )应用的微流控芯片的表面修饰往往是一个耗时的过程，涉及芯片清洗、紫外( UV )曝光、蒸汽灭菌等。本文报道了一种简单、快速、经济的方法，利用标准生物安全柜内的紫外光，在微流控芯片上一步实现儿茶酚胺材料的光引发聚合和图形化。聚二甲基硅氧烷( PDMS )微流控器件中填充多巴胺和去甲肾上腺素单体，然后在紫外光照射下引发材料的聚合，为OOC的应用创造了一个高度可行的表面。我们考察了这些紫外光引发的表面涂层用于制造3种不同的OOCs的性能，微流控芯片通过3种不同的方式进行键合和修饰：1 )常规的氧等离子体键合微流控芯片填充单体溶液，然后暴露在紫外光下对表面进行修饰(等离子体键合，聚合物包复)；2 )流体层和玻璃基底均暴露在紫外光下对功能层进行包复，同时允许黏合蛋白将这2块结合在一起(紫外光键合，聚合物包复)；3 )通过掩膜将紫外光投射到聚二甲基硅氧烷( PDMS )基底上，形成流体壁微流控通道(投影包复)。3种技术中在紫外光照射聚合物涂层表面接种的Cath . a . differential ( CAD )细胞表现出明显的高细胞活力、细胞黏附、增殖、基因表达，与未涂层PDMS相比保留了功能性。UV引发的表面改性技术使用了一种极简的方法，使用较少的设备和现有的基础设施，如生物安全柜，来创建一个功能性的OOC。

采用色谱分离、光谱和光谱检测等多种分析方法，研究了聚碳酸酯聚二甲基硅氧烷共聚物( PC-co- PDMS )的结构和组成。特别地，利用尺寸排阻色谱( SEC )和液相吸附色谱在不同条件下(如采用梯度溶剂体系)实现了按摩尔质量和功能分布的分离。两种方法的耦合产生了指纹图谱二维图，可以方便地比较不同的共聚物批次。采用基质辅助激光解吸/电离飞行时间质谱( MALDI-TOF )进行结构考察。然而，两种共聚单体的不同电离行为极大地限制了该技术的适用性。与此相反，傅里叶变换红外光谱( FTIR )可用于定量色谱图中不同位置共聚物中PDMS的量。该方法能够区分PC-co- PDMS共聚物和材料中存在的PC均聚物链。