**7. Concluding Remarks**

Amorphization of drugs has great value in research and application due to the benefits of improving the solubility, dissolution, and bioavailability of poorly water-soluble drugs. It is of importance to develop characterization methods for studying the physicochemical properties of ASDs, especially for maintaining their physical stability. With a better understanding on the recent development of the characterization methods, it is expected that the commercialization of ASDs with desired pharmaceutical properties would be greatly accelerated.

**Author Contributions:** Conceptualization, Q.S., C.Z. and Y.W. (Yanan Wang); Writing—original draft preparation, Y.W. (Yanan Wang) and Y.W. (Yong Wang); Writing—review and editing, Q.S., J.C., H.C., J.X. and Z.L.; Funding acquisition, Q.S. and C.Z. All authors have read and agreed to the published version of the manuscript.

**Funding:** The authors are grateful for financial support of this work by the National Natural Science Foundation of China (nos. 81803452, 21803004), the Natural Science Foundation of Jiangsu Province (no. BK20211114), Shenzhen Science and Technology Innovation Committee (no. JCYJ20200109141808025) and the National Subject Cultivation Project of Jiangsu Vocational College of Medicine (no. 20204304).

**Conflicts of Interest:** The authors declare no conflict of interest.
