- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Continuous Synthesis of Monodisperse Yolk-Shell Titania Microspheres
摘要： A microfluidic strategy is developed for continuous synthesis of monodisperse yolk-shell titania microspheres. The continuous flow synthesis of titania microparticles is achieved by decoupling the microdroplet formation and interfacial hydrolysis reaction steps by utilizing a polar aprotic solvent as the continuous phase in the microreactor. The decoupling of the precursor microdroplet formation and the hydrolysis reaction allows titania synthesis throughputs an order of magnitude higher than those previously reported in a single-channel flow reactor (~0.1 g/h calcined microparticles), without affecting the microreactor lifetime due to clogging. Flow synthesis and dynamics across a broad range of precursor flow rates are examined, while effects of flow synthesis parameters, including the precursor to continuous phase flow rate ratio, precursor composition, and calcination temperature on the surface morphology, size, and composition of the resulting titania microparticles are explored in detail. Titania microparticle size can be controlled by variation in the precursor to continuous phase flow rate ratio. The surface morphology and porosity of the in-flow synthesized titania microparticles can be varied by adjusting the precursor composition, while crystalline phase can be tuned by varying the calcination temperature.
关键词： continuous synthesis,titania,microfluidic,yolk-shell,monodisperse
更新于2025-09-09 09:28:46
-
Rational design of yolk–shell nanostructures for photocatalysis
摘要： Photocatalysis is a promising route to convert solar energy into chemical energy directly, providing an alternative solution to environment and natural resource problems. Theoretically, all photocatalytic reactions are driven by charge carriers whose behavior can be divided into charge generation, separation, migration and surface reactions. Efficiencies of charge utilization in every step determine the overall performance of photocatalysis. Yolk–shell (YS) structures can provide an ideal platform for the efficient utilization of charge carriers. Typically, a YS structure is constructed from a hollow shell and an inner core, which can enhance light scattering in the hollow space and provide a large surface to create sufficient active sites, both of which can significantly improve the efficacy of charge utilization. Additionally, many strategies can be adopted to modify the YS structure for further enhancement of charge behaviors in every step. Existing reviews about YS structures mainly concentrate on the universality of the application of YSs, while the strategies to improve photocatalytic performance based on YSs have not been elaborately illustrated. This review describes the classification, synthesis, formation mechanism of YS structures and the rational regulation of the behaviors of photogenerated charge carriers, aiming at their effective utilization based on YS structures in heterogeneous photocatalytic reactions.
关键词： Charge carriers,Heterogeneous photocatalytic reactions,Solar energy conversion,Yolk–shell structures,Photocatalysis
更新于2025-09-04 15:30:14