Statler College of Engineering and Mining Resources
Mechanical and Aerospace Engineering
Silica is the most abundant component on the earth’s surface. It plays an important role in many natural processes. Silica is also a critical material for a wide range of technical applications such as in optics and electronics. In this work, we discuss our recent experimental observation of the unusual amber coloration of aluminum doped sol-gel glass that has not been reported in the past. We characterized Al-doped sol-gel glasses, prepared at different sintering temperature, using a plethora of techniques to investigate the origin of this unusual coloration and to understand their structural and chemical properties. We used these experimental results to test a number of possible coloring mechanisms. The results suggested this coloring is likely caused by temperature-dependent aluminum-associated defect centers associated with different amorphous-to-crystalline ratios of the annealed sol-gel silica glass structures.
Digital Commons Citation
Chang, Alvin; He, Yujuan; Arango, Maria A. Torres; Wang, Maoyu; Ren, Yang; Feng, Zhenxing; Chang, Chih-Hung; and Sierros, Knostantinos A., "On the Unusual Amber Coloration of Nanoporous Sol-gel Processed Al-doped Silica Glass: An Experimental Study" (2019). Faculty & Staff Scholarship. 1849.
Chang, A., He, Y., Arango, M. A. T., Wang, M., Ren, Y., Feng, Z., Chang, C.-H., & Sierros, K. A. (2019). On the unusual amber coloration of nanoporous sol-gel processed Al-doped silica glass: An experimental study. Scientific Reports, 9(1). https://doi.org/10.1038/s41598-019-48917-4