Continuous fabrication of calcium sulfate whiskers with adjustable aspect ratio in microdroplets

Qi, Yunfei; Zeng, Changfeng; Wang, Chongqing; Ke, Xuebin; Zhang, Lixiong

Abstract

Hemi-hydrate and anhydrous CaSO₄ whiskers with adjustable aspect ratio were continuously synthesized by the reactive crystallization of CaCl₂ to K₂ S₂ O₈ in microdroplets. The effects of solvent and reactive temperature were examined, with SEM and XRD characterizations. Hemi-hydrate and anhydrous CaSO₄ whiskers can be, respectively, obtained in aqueous and N,N-dimethylformamide solutions at 90 °C in 180 s. The addition of ethylene glycol or glycerol as well as increasing temperature could lead to the increase in length and aspect ratio of the whiskers. Thus this preparation technique provides a simple continuous route to synthesize CaSO₄ whiskers with two kinds of crystal structures in a short time, and adjustable lengths and aspect ratios.

Citation

Qi, Y., Zeng, C., Wang, C., Ke, X., & Zhang, L. (2017). Continuous fabrication of calcium sulfate whiskers with adjustable aspect ratio in microdroplets. Materials letters, 194, 231-233. https://doi.org/10.1016/j.matlet.2017.02.066

• Acceptance Date: Feb 18, 2017
• Online Publication Date: Feb 21, 2017
• Publication Date: May 1, 2017
• Deposit Date: Apr 24, 2017
• Publicly Available Date: Feb 28, 2018
• Journal: Materials letters
• Print ISSN: 0167-577X
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 194
• Pages: 231-233
• DOI: https://doi.org/10.1016/j.matlet.2017.02.066
• Keywords: CaSO₄; Whiskers; Crystal growth; Crystal structure
• Public URL: https://hull-repository.worktribe.com/output/450742
• Publisher URL: http://www.sciencedirect.com/science/article/pii/S0167577X17302471
• Additional Information: Authors' accepted manuscript of article published in: Materials letters, 2017, v.194.
• Contract Date: Feb 28, 2018