水样中低含量阳离子聚合电解质的测定

阳离子聚合电解质与阴离子荧光染料形成胶体复合物。实验表明，在阳离子聚合电解质的存在下，荧光染料溶液中荧光强度的变化值与被荧光染料复合的聚合电解质的含量成正比，此法测定水样中低含量聚合电解质，结果令人满意。     

Chitosan-Based Zwitterionic Polyelectrolytes and Their N-Phosphobetainates: Facile Synthesis and Aqueous Solution Behaviors

1Introduction Chitosan has remarkable potential applications in pharmaceutical and cosmetic formulations[1], e.g. for drug delivery systems, tissue engineering, transplant and cell regeneration due to its excellent biocompatibility, biodegradability, mucoadhesion, etc. Its major drawback as considered for pharmaceutical and cosmetic formulations is its poor solubility due to strong hydrogen bonding and compact structures. Considerable efforts were focused on improving its solubility and enforcing its functionality[1]. As well-known that phosphorylcholine (PC), the structural component of cell membrane, is an amphiphile containing the zwitterionic quaternary ammonium and phosphonic acid moieties (phosphobetaine groups). There has been an intensive effort over the past decades to prepare and explore potential applications of the synthetic PC-polymers[2].In this paper, we describe a facile synthesis of chitosan derivatives containing zwitterionic secondary/tertiary amine and phosphonic acid groups and their further N-phosphobetainates. The polyelectrolyte effect and anti-polyelectrolyte effect of the chitosan-based zwitterionic polyelectrolytes were studied.     

Synthesis and Characterization of Photoresponsive Azo Polyelectrolytes

IntroductionPhotoresponsive polymers have been extensivelyinvestigated for their potential applications in theareas of optical information storage and opticalcontrolling processes.Azo polymers are receivingincreasing attention because of their specialproperties and interesting potential applications,including light- induced phase transition of LCP[1] ,command surfaces[2 ] ,light- induced birefringenceand dichroism[3] ,second- order opticalnonlinearity[4 ] ,light- induced surface reliefgrating…     

The Use of Chemical Modification of Polymer Waste for Obtaining Polymer Flocculants

1 Results Chemical modification of polymer plastic wastes to useful products can be one of the way of effective waste plastics management (chemical recycling). Chemical modification of polymers and polymer plastic wastes can yield products with suitable physical and chemical properties. In consequence they can be used as polyelectrolytes[1]. The variety of pollutants, universality of various water and sewage treatment technologies, introduction of new water quality improved technologies have caused a gr...     

基于邻苯二胺电聚合膜和PSS自组装的补体C3压电免疫传感器

生物分子固定化或传感界面设计技术是研制压电免疫传感器的关键之一．本文结合电聚合膜和聚电解质静电吸附组装技术，提出了一种新的压电免疫传感器中生物分子固定化方法，研制成一种检测补体C3的压电免疫传感器．研究了pH值、抗体稀释比和温育温度等抗体的固定化条件，讨论了传感器采用这种固定化方法的响应与再生性能，并与戊二醛键合固定化法进行比较．结果表明，该传感器的响应频移值大，在补体C3浓度为7．75μg／mL时。采用该法频移值达239Hz，而采用戊二醛键合固定化法频移值仅163Hz；灵敏度高，最小检出浓度达0．078μg／mL；选择性较好，对同浓度的牛血清白蛋白(BSA)响应很小，仅为35Hz．此外，该传感器能重复使用20次以上，具有较好的再生性能．     

聚合物电解质包裹金核银壳纳米棒制备双模式光学细胞成像探针

报道了一种新型的荧光及表面增强拉曼散射(SERS)双模式光学成像探针. 该探针以金核银壳纳米棒为SERS增强基底, 其表面标记拉曼分子产生SERS信号. 随后通过层层吸附的方法在标记了拉曼分子的金核银壳纳米棒表面包裹聚合物电解质. 最后在聚合物电解质层上连接异硫氰酸荧光素产生荧光信号. 将探针置入HeLa细胞, 实现了荧光、SERS双模式成像. 该探针具有以下优点: (1) 能产生荧光、SERS两种信号, 实现双模式光学成像; (2) 金核银壳纳米棒具有优异的SERS增强能力, 使得探针进入活细胞后仍能提供高信噪比的SERS信号; (3) 聚合物电解质在形成隔离层避免荧光信号被金属淬灭的同时, 提高了探针的生物兼容性. 这种双模式光学成像探针在药物输运和肿瘤靶向等研究中具有重大的应用前景.     

高分散高稳定BaTiO3水基悬浮液制备的研究

采用胶体电空间稳定机制改善陶瓷粉体的分散性,以聚合物电解质PMAA—NH_4为分散剂,利用Zeta电位、沉降实验、粘度测定和粒度分析等手段,研究了分散剂的用量和pH值对BaTiO_3水基悬浮液流变性的影响,并在最佳分散剂用量和pH值条件下,制备出了高分散高稳定的BaTiO_3水基悬浮液。图4,参11。     

分光光度法测定水中阳离子聚合电解质

阴离子染料能与水中阳离子聚合电解质形成胶体复合物,该复合物不溶于水和有机溶剂,通过离心分离除去.由体系中吸光度值的变化,可推出体系中阳离子聚合电解质的含量.     

超细粉体在液相中分散稳定性的研究

文章以纳米 Zr O2 的水悬浮液为例 ,通过粒度分布测量法和上层清液的光透过法等方法 ,研究水溶液中 Zr O2 粉体的表面特性、聚电解质分散剂的结构与数量以及悬浮液的离子浓度等对悬浮液稳定性的影响 ,提出了改善纳米 Zr O2 在水溶液中分散稳定性的几点措施。研究结果表明 ,分散剂的用量及 p H值是控制粉体悬浮液分散性和稳定性的主要参数 ,研究结果较满意。     

Chitosan-Based Zwitterionic Polyelectrolytes and Their N-Phosphobetainates： Facile Synthesis and Aqueous Solution Behaviors

Chitosan has remarkable potential applications in pharmaceutical and cosmetic formulations, e.g. for drug delivery systems, tissue engineering, transplant and cell regeneration due to its excellent biocompatibility, biodegradability, mucoadhesion, etc. Its major drawback as considered for pharmaceutical and cosmetic formulations is its poor solubility due to strong hydrogen bonding and compact structures. Considerable efforts were focused on improving its solubility and enforcing its functionality. As well-known that phosphorylcholine （PC）, the structural component of cell membrane, is an amphiphile containing the zwitterionic quaternary ammonium and phosphonic acid moieties （phosphobetaine groups）. There has been an intensive effort over the past decades to prepare and explore potential applications of the synthetic PC-polymers.