Effect of Cu2+ on the nucleation kinetics and crystallization of rod-shaped CaSO4·2H2O in aqueous solution. Issue 62 (5th November 2019)

• Record Type: Journal Article
• Authors: Sun, Xiangbin; Wang, Xianshun; Zhang, Genlei; Cui, Peng; Shen, Hao
• Is Part Of: RSC advances. Volume 9:Issue 62(2019)
• Page Start: 36020
• Page End: 36026
• Publication Date: 2019-11-05
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c9ra07640a
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : The induction time of DH crystals is extended by the introduction of Cu 2+ . Abstract : In this study, a simple and efficient strategy is developed to synthesize rod-like CaSO4 ·2H2 O (DH) crystals with tunable aspect ratio in aqueous solution using Cu 2+ as modifier. The aspect ratio and length of the DH crystals are effectively reduced to 5.7 : 1 and about 35 μm in the presence of Cu 2+, respectively. The interfacial tension value ( γ ) in the aqueous solution is improved significantly with the assistance of Cu 2+, yet the nucleation rate ( J ) of the DH crystal is decreased sharply. The interfacial tension value ( γ ) in the aqueous solution is improved and the nucleation rate ( J ) of the DH crystal is drastically decreased due to the introduction of Cu 2+, leading to the induction time of the DH crystallization being extended from 4 min to 25 min. The diversification of morphology for the DH crystals is incited by the changes of nucleation kinetics and Cu 2+ incorporated into the crystal lattice, affecting the crystal growth habit, and finally controlling the growth of DH crystals in aqueous solution.