Microcapsule production by an hybrid colloidosome-layer-by-layer technique

Although many different methods for microencapsulation are known only some of them had been applied at industrial scale, due to complexity, lack of mechanical strength of the resulting capsules, and the costs related to their production. One of such methods is the electrostatic layer-by-layer (LbL) adsorption, which produce shells from oppositely charged polymers. The thickness of those shells can be tuned with nanometric precision, but to build enough strength for practical applications requires the adsorption of an impractical number of layers. We present here a method to produce strong microcapsules combining the assembly of a protein/pectin shell via electrostatic LbL adsorption with the adsorption of bigger charged colloidal particles. Those colloidal particles do not need any pretreatment to modify their wettability, as would be the case for a standard colloidosome route. In this way strong encapsulates with porous walls are obtained, which can be used as easy to load scaffolds. The pores in the walls can be closed through subsequent adsorption of more layers of protein and pectin. Since the assembly scheme occurs at pH 3.5 we expect the produced microcapsules to act as an effective delivery system in food products, protecting their contents from the acidity of the stomach and dissolving later at the small intestine. The proteins and pectins used as basic building blocks are food-grade and inexpensive.     

An enzyme-loaded reactor using metal-organic framework-templated polydopamine microcapsule

Ultrathin polydopamine microcapsules with hierarchical structure and porosity were prepared for the immobilization of multienzymes using metal-organic framework (MOF) as the template. The multienzyme/MOF composite was first prepared using a “one-pot” co-precipitation approach via the coordination and self-assembly of zinc ions and 2-methylimidazole in the presence of enzymes. The obtained nanoparticles were then coated with polydopamine thin layer through the self-polymerization of dopamine under alkaline condition. The polydopamine microcapsules with an ultrathin shell thickness of ~48 nm were finally generated by removing the MOF template at acidic condition. Three enzymes were encapsulated in PDA microcapsules including carbonic anhydrase (CA), formate dehydrogenase (FateDH), and glutamate dehydrogenase (GDH). FateDH that catalyzed the main reaction of CO₂ reduction to formic acid retained 94.7% activity of equivalent free FateDH. Compared with free multienzymes, the immobilized ones embedded in PDA microcapsules exhibited 4.5-times higher of formate production and high catalytic efficiency with a co-factor-based formate yield of 342%.     

高阻尼微胶囊/环氧树脂复合材料的制备及性能

以不同含量和粒径的微胶囊制备了微胶囊/环氧树脂复合材料,采用动态力学热分析仪,通过双悬臂梁测试方法在变温(-40～150℃)和变频(1～200Hz)条件下对其阻尼性能进行了研究。结果表明:微胶囊含量、粒径以及囊芯液体的黏度对复合材料的阻尼性能有显著影响。在相同含量下,随着微胶囊粒径和囊芯液体黏度的增大,复合材料阻尼性能不断提高。微胶囊的加入提高了复合材料低频下的阻尼性能。     

十八烷/PSt相变微胶囊的制备及其热性能研究

细乳液法制备了十八烷/聚苯乙烯(PSt)相变微胶囊,用TEM、DLS和DSC等对微胶囊进行了表征。研究了十二烷基硫酸钠(SDS)的加入量、亲水性单体丙烯酸的加入量、引发剂类型以及苯乙烯与十八烷的加料比对产物形态的影响。研究表明:低的SDS浓度有利于微胶囊结构的形成,产物粒子的平均粒径随SDS加入量的增大而减小;加入亲水性共聚单体丙烯酸可以改善微胶囊的形态,但产物中PSt均相微球增多;使用油溶性引发剂AIBN比使用KPS更加有利于微胶囊的形成;苯乙烯与十八烷的投料比为1∶1时,制备的微胶囊相变焓为111.6 J/g。     

纺织涂料用可逆热敏变色色素研究

主要对用于纺织涂料的供吸电子型可逆热敏变色色素作一探讨，着重讨论可逆热敏变色色素的各组份对变色温度、变色灵敏度的关系及影响情况，还对色素微胶囊的稳定性进行了讨论。     

哒螨酮微胶囊剂的制备研究

本研究选用杀虫杀螨剂哒螨酮为芯材，以癸二酰氯、乙二醇聚合生成的聚酯为囊皮，制备哒螨酮微胶囊；工艺条件为聚合温度30-50℃，搅拌速率500r/min；实验证明单体总用量、搅拌速率、聚合温度影响微胶囊剂的外观及粒径。     

热敏记录材料及其研发新进展

本文介绍了热敏记录材料的种类、用途和基本成像原理。重点介绍了热响应性微胶囊、光固定、全彩色热敏成像和热升华转印的技术要点。还介绍了热敏记录材料研发新进展中的几项专利发明技术要旨。指出了起步较晚的我国热敏记录材料研发、生产业界引进、参考、借鉴国外专利发明技术要旨的重要性。     

微胶囊技术及其在复合材料中的应用

介绍了微胶囊技术的概念及其种类,归纳总结了微胶囊的表征方法。根据微胶囊近年来的研究,重点阐述了微胶囊技术在聚合物基复合材料损伤自修复过程中的应用研究。     

Transferring Process of RE~(3 ) with the Microcapsules Containing P507

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