Abstract
The presented study aims at synthesizing layered calcium hydroxide particles by precipitating method in aqueous media. Prepared layered particles were characterized by different experimental methods including powder X-ray diffraction (XRD), field emission scanning electron microscopy (SEM) and flourier transform infrared spectroscopy (FT-IR). It is observed by the XRD analysis that the layered Ca(OH)2 particles exhibit high crystallininty structure and layered particles preferentially orientate in (001) and (101) reflection plane. The FT-IR result shows that the starch molecules exist in interlayer of Ca(OH)2 crystals after removing washing step which confirms that the starch molecules are involved in the growth process of the Ca(OH)2 crystal. Starch modified Ca(OH)2 particles are observed in irregular shape with layers assembled given in SEM images. When pr-dissolving the starch in alkaline solution, only irregular thin plates are observed in SEM images. Based on the results, the formation mechanism of layered calcium hydroxide could be summarized as that monolayer calcium hydroxide is assembled by starch molecules. Starch-assisted synthetic layered calcium hydroxide particle method was first proposed and synthetic particles can be used to control the cement hydration process.
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Acknowledgements
The authors gratefully acknowledge the financial supports from National Key R&D Program of China (Grant No. 2017YFB0310100) and the 973 Program of China (Grant No. 2015CB655100). This work was also supported by the Scientific Research Foundation of Graduate School of Southeast University. And also greatly appreciate Jiangsu Research Institute of Building Science Co., Ltd. and the State Key Laboratory of High Performance Civil Engineering Materials for funding the research project.
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Zhang, H., Wang, W., Li, L. et al. Starch-Assisted Synthesis and Characterization of Layered Calcium Hydroxide Particles. J Inorg Organomet Polym 28, 2399–2406 (2018). https://doi.org/10.1007/s10904-018-0895-7
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DOI: https://doi.org/10.1007/s10904-018-0895-7