科研之友
微信
新浪微博
Facebook
分享链接
摘要
Complex porous fluorescein microspheres with hierarchical superstructures and relievo-like complex fluorescein crystals can be easily generated by a recrystallization/reprecipitation method using poly(allylamine hydrochloride) (PAH) and poly(sodium 4-styrenesulfonate) (PSS) as structure directing agents at room temperature. The polymer-induced liquid precursor (PILP) phase is believed to play a role in the formation of such unusual shapes and structures. The shape and sizes of fluorescein crystals can be well controlled by adjusting the amounts of raw fluorescein precursor and polyelectrolytes. Furthermore, shaking and ultrasonic treatments can provide additional parameters for fabricated of fluorescein crystals with unique superstructures. The UV-vis spectroscopy indicates that the addition of PAH results in shifting of the absorption peak of monomer from 481 nm toward 494 nm, and such shifting is dependent on the PAH concentration.
- 出版日期2007-12
- 单位中国科学技术大学
