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22 results on '"Xu Shijie"'

8. Role of Additives in Crystal Nucleation from Solutions: A Review

Author

Xu, Shijie, Cao, Di, Liu, Yixuan, and Wang, Yanfei

Abstract

Nucleation is a key step in the crystallization of solution. For regulating and controlling this process, it is thus critical to understand the nucleation mechanism under different circumstances. Note that how additives affect nucleation has not been essentially summarized. This contribution aims to explore the role of additives in theoretical models and practical applications. First, we review the development of nucleation theory: classical nucleation theory (CNT) and nonclassical nucleation theory (non-CNT). Under the framework of CNT, how additives influence the nucleation is expounded through the interactions between species involved in nucleation, along with solid–liquid interfacial energy and pre-exponential factors based on the metastable zone width (MSZW) and nucleation induction time (NIT). In non-CNT, we then discuss the effects of additives on the structural evolution of prenucleated species and competitive properties such as the Gibbs free energy change. Then, we summarize the role of multifarious additives in nucleation. Finally, how additives are adapted to treat some diseases in pathological biomineralization such as lithiasis is summarized. This review has a positive significance for comprehending the roles of additives on the nucleation in a solution milieu.

Published
2022
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21. Crystalline o-Carborane Derivatives as a Fluorescence Turning-On Probe for Acid Environments

Author

Shi, Junqing, Li, Mengjia, Xu, Shijie, Chen, Minhui, Zhang, Xinning, Zhang, Yufeng, Wu, Lin, and Ji, Lei

Abstract

Fluorescence from o-carborane derivatives is usually weak in solution due to the robust nonradiative decay via the motion of bond rotation, but it is enhanced in the aggregated states, which is also known as aggregation-induced emission. To the best of our knowledge, there is no other way to significantly enhance the fluorescence intensity of o-carborane derivatives in the reported literature. Also, novel strategies and sensing materials for gaseous acid detection are in high demand due to the aspects of high sensitivity, easy operation, and low cost. Herein, we report the effective fluorescence turning-on phenomenon of crystalline o-carborane derivatives upon exposure to acidic gas, which shows that crystalline o-carborane derivatives can function as effective sensors for acidic environments.

Published
2024
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