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. 2017 May 11;7:1798. doi: 10.1038/s41598-017-01953-4

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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FT-IR spectra of CaOx crystallized in AU with various pH. (A) FT-IR spectra demonstrated the consistent spectra of CaOx. (B) Proportion of CaOx monohydrate (COM or whewellite) and dihydrate (COD or weddellite) slightly varied among different pH conditions. (C) Curve fitting analysis to differentiate pattern of “O-H” stretching between wavenumber of 3600–2800 cm⁻¹ of FT-IR spectra.