疏水性

ˆ䐀缘ˆ䐀缘

Abstract(#br)In operation of hydrogen fuel cells for vehicle, carbon corrosion induced by frequent on/off operation significantly causes degradation of performance and durability of fuel cells, aggregating and losing Pt particles. It is critical to develop durable cathode and understand the mechanism of degradation in hydrogen fuel cells for commercialization. In this study, we prepared polydimethylsiloxane treated cathode, which is hydrophobic, for improving durability in hydrogen fuel cells. In addition, effect of hydrophobic cathode on durability was investigated by various analyses.

Abstract(#br)In this study, the graphene oxide was covalently modified by amino terminated polydimethylsiloxane (PDMS) through amidation reaction. And the membranes of the graphene oxide (GO), reduced graphene oxide (RGO) and PDMS-covalently modified graphene were prepared respectively by a vacuum filtration method, and the wettability of these membranes were investigated.

Abstract(#br)The purpose of this paper was to develop the hydrophobic nanocomposite coatings of polydimethylsiloxane (PDMS)-SiO 2 -CuO to improve biocompatibility, corrosion resistance and antibacterial property of 316 L stainless. In this research, after synthesize of CuO and SiO 2 nanopowders using wet-chemical approaches, PDMS-SiO 2 -CuO coatings consisting of various amounts of CuO nanoparticles were developed using dip-coating process.

Abstract(#br)High temperature vulcanized (HTV) silicone rubber (SR) specimens with a clean surface or a surface covered by a contamination layer were exposed to the corona discharge generated by a needle-plate electrode system. Hydrophobicity loss and recovery processes were investigated during and after corona exposure. In addition, physicochemical analyses on the specimens were carried out using scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy and gas chromatography/mass spectrometry (GC/MS).

Hydrophobic Polydimethylsiloxane Thin Films Prepared by Chemical Vapor Deposition: Application in Water PurificationPDMS;hydrophobicity;hydrophilicity;water purification;Polydimethylsiloxane (PDMS) can be deposited on various substrates using chemical vapor deposition process, which results in the formation of PDMS thin films with thickness below 5 nm. PDMS layers can be evenly deposited on surfaces of nanoparticles composed of various chemical compositions such as $SiO_2$, $TiO_2$, ZnO, C, Ni, and NiO, and the PDMS-coated surface becomes completely hydrophobic.

聚二甲基硅氧烷( PDMS )是一种有机硅聚合物，目前主要应用于人体的片上器官微生理系统。PDMS制成的微流控通道的疏水表面往往造成细胞外基质( ECM )的粘附不良以及细胞的附着。在PDMS基器件中通过等离子体或UV /臭氧处理的表面改性，产生了亲水的表面，允许健壮的ECM涂层和人肠道永生化细胞系的可重复性附着。然而，这些表面活化方法在形成活检来源的原代器官样上皮单层方面并没有成功。现有的几种在PDMS微通道中生长人肠类器官样细胞的方法由于信息有限，并不总是可重复操作的。在这里，我们报告了一种优化的方法，可以使肠道器官样上皮牢固和可重复性地附着在PDMS芯片上的肠道。在已报道的几种方法中，我们优化了一种通过聚乙烯亚胺表面功能化再通过戊二醛交联活化PDMS表面的方法。而且，我们发现，后功能化步骤有助于提供均匀的ECM沉积，使游离的肠类器官上皮在PDMS基微器件中产生牢固的附着。我们设想，我们的优化方案可能传播一种有利的方法，以促进将人类有机基因型文化融入到芯片上的人体器官中，用于针对病人的疾病建模。

聚二甲基硅氧烷( PDMS )是一种有机硅聚合物，目前主要应用于人体的片上器官微生理系统。PDMS制成的微流控通道的疏水表面往往造成细胞外基质( ECM )的粘附不良以及细胞的附着。在PDMS基器件中通过等离子体或UV /臭氧处理的表面改性，产生了亲水的表面，允许健壮的ECM涂层和人肠道永生化细胞系的可重复性附着。然而，这些表面活化方法在形成活检来源的原代器官样上皮单层方面并没有成功。现有的几种在PDMS微通道中生长人肠类器官样细胞的方法由于信息有限，并不总是可重复操作的。在这里，我们报告了一种优化的方法，可以使肠道器官样上皮牢固和可重复性地附着在PDMS芯片上的肠道。在已报道的几种方法中，我们优化了一种通过聚乙烯亚胺表面功能化再通过戊二醛交联活化PDMS表面的方法。而且，我们发现，后功能化步骤有助于提供均匀的ECM沉积，使游离的肠类器官上皮在PDMS基微器件中产生牢固的附着。我们设想，我们的优化方案可能传播一种有利的方法，以促进将人类有机基因型文化融入到芯片上的人体器官中，用于针对病人的疾病建模。

聚二甲基硅氧烷( PDMS )薄膜和表面通过热交联得到的商用Sylgard 184，由于其优越的热稳定性、低介电常数、透明性和生物相容性，在许多科学领域得到了广泛的应用。交联PDMS表面是弱疏水性的，多次实验，特别是利用毛细管驱动的微尺度流动需要对表面润湿性进行调制。一个众所周知的实现相同的策略是在室温下将Sylgard 184表面暴露于UV /臭氧( UVO )处理。随着暴露时间的延长，润湿性由疏水性下降到近完全润湿(水接触角~ 10° )，这是由于表面形成了一层氧化层。然而，在正常的大气条件下，由于未交联的低聚物向表面扩散迁移，形成疏水的二甲基硅层，这些表面在一段时间内恢复了疏水性。我们探索了疏水回收过程与交联剂浓度和UVO曝光时间的关系，并展示了部分或完全回收的PDMS印章如何影响后续的纳米图案，包括可能通过单个印章产生不同形貌的特征。