Evaporation‐induced Self‐assembly Process Controlled for Obtaining Highly Ordered Mesoporous Materials with Demanded Morphologies

A large number of periodic mesoporous materials have been reported using amphiphilic organic molecules with increasing development of synthetic methods for mesostructural, morphological, and compositional designs. The evaporation‐induced self‐assembly (ESIA) process to fabricate ordered mesoporous films is one of the most essential synthetic methods, which has extensively been applied for obtaining a wide variety of samples (e.g., films and monoliths, including powders). It contains complicated physical variations and chemical reactions, but has been simply explained by several research groups. However, a current, exact understanding of such complicated systems should be given with respect to all the variations and reactions. In this article, I have mainly surveyed the exact EISA process by considering the difference between simple and controlled EISA processes on the basis of my own experiments. I believe that the insights are consequently helpful for obtaining highly ordered mesoporous materials with demanded morphologies.     

立方规则孔道结构含锆介孔氧化硅的合成与表征

以三嵌段共聚物为模板剂, 利用溶剂挥发法合成了具有立方相的含锆介孔氧化硅材料, 并对其结构进行了表征, 初步研究了其生成机理.     

介孔氧化硅膜在多孔陶瓷载体上的组装

采用过滤成膜方式结合溶剂挥发诱导自组装方法在多孔氧化铝中空纤维上制备了介孔氧化硅膜。XRD、TEM和N₂吸附脱附实验结果显示非担载膜具有有序的六方介孔结构。通过对中空纤维担载膜的XRD分析进一步确认介孔氧化硅膜的形成。SEM和EDS线扫描结果显示制备的担载膜表面完整、无缺陷,膜层和载体界面之间结合紧密。在此基础上对介孔膜在多孔陶瓷载体上的形成机理进行了探讨。     

A Platform Approach to Protein Encapsulates with Controllable Surface Chemistry

The encapsulation of proteins into core-shell structures is a widely utilised strategy for controlling protein stability, delivery and release. Despite the recognised utility of these microstructures, however, core-shell fabrication routes are often too costly or poorly scalable to allow for industrial translation. Furthermore, many scalable routes rely upon emulsion-techniques implicating denaturing or environmentally harmful organic solvents. Herein, we investigate core-shell protein encapsulation through single-feed, aqueous spray drying: a cheap, industrially ubiquitous particle-formation technology in the absence of organic solvents. We show that an excipient’s preference for the surface of the spray dried particle is well-predicted by its hydrodynamic diameter (Dh) under relevant feed buffer conditions (pH and ionic strength) and that the predictive power of Dh is improved when measured at the spray dryer outlet temperature compared to room temperature (R2 = 0.64 vs. 0.59). Lastly, we leverage these findings to propose an adaptable design framework for fabricating core-shell protein encapsulates by single-feed aqueous spray drying.     

Encapsulation of dye molecules into mesoporous polymer resin and mesoporous polymer-silica films by an evaporation-induced self-assembly method

Polymer resin and polymer-silica films with highly ordered mesostructure have been used as host materials to encapsulate DCM (4-(dicyanomethylene) -2-methyl-6-(4-dimethylaminostyryl)-4h-pyran), a kind of fluorescent dye, through evaporation-induced self-assembly method (EISA). After encapsulation, the composites show significant blue-shift in photoluminescence (PL) spectra. Particularly, by changing the excitation wavelength, the samples show different emission bands. These phenomena are related to the mesostructure and the positions of DCM molecules in the host.     

硅藻土辅助制备有序介孔碳及其电催化性能

以共聚物F127 为软模板, 酚醛树脂为碳源, 引入硅藻土充当暂态支架, 在不同硅藻土与酚醛树脂质量比下, 用蒸发自组装法合成有序介孔碳材料. 利用XRD, TEM, N₂ 吸附-脱附对其结构进行表征, 结果显示, 与单一软模板相比,在硅藻土辅助下获得的介孔碳材料不仅具有高度有序的孔道, 还具有更大的比表面积(717～773 m²·g^-1)和孔径(3.9～11.3 nm). 依据原料比例与介孔碳结构两者间的变化规律, 初步探讨了硅藻土在制备中所起的辅助作用. 采用微波多元醇还原法制备介孔碳载Pt 电催化剂, 在甲醇溶液中进行循环伏安测试, 发现比表面积的增大有利于碳材料的电催化性能提高, 当硅藻土与酚醛树脂的比例为0.5 时, 制备出的有序介孔碳比表面积最大, 载Pt 后呈现的正向氧化峰电流也最大.