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Publikācija: Effect on Drying Conditions on Amorphous Calcium Phosphate

Publication Type Conference paper
Funding for basic activity Unknown
Defending: ,
Publication language English (en)
Title in original language Effect on Drying Conditions on Amorphous Calcium Phosphate
Field of research 2. Engineering and technology
Sub-field of research 2.4 Chemical engineering
Authors Agnese Brangule
Kārlis-Agris Gross
Keywords amorphous calcium phosphate, drying conditions, drying agents, FTIR DRIFT, XRD
Abstract Amorphous calcium phosphate (ACP) plays an important role in the body and can be used as an intermediate phase for forming calcium phosphates. All ACPs are thermodynamically unstable compounds unless stored in dry conditions and spontaneously undergo transformation to crystalline calcium phosphates (CaP). This work will investigate the influence of drying on the stability of ACP. ACP powders were prepared by wet synthesis where a calcium containing solution was rapidly mixed with a phosphate solution. The suspension was stirred, filtered and washed and the filter cake was dried at different conditions and with different drying agents. XRD patterns and FTIR spectra showed poorly crystallinity powders after drying. Some FTIR spectra indicated residual organic compounds from drying. The Rietveld’s method and Scherrer’s relationship estimated the crystallite size as about 15 - 20 nm. Thermogravimetry (TG) revealed a 7 – 25% weight loss upon drying. The drying agents have no significant effect on particle characteristics. By changing the drying conditions, it is a possible to retain the amorphous calcium phosphate or adjust the particle size, level of crystallinity, moisture content and type of carbonate modification to the apatite lattice.
Reference Brangule, A., Gross, K. Effect on Drying Conditions on Amorphous Calcium Phosphate. In: 26th Symposium and Annual Meeting of the International Society for Ceramics in Medicine (BIOCERAMICS 26): Final Programme and Abstracts Book, Spain, Barselona, 6-8 November, 2014. Barselona: 2014, pp.75-75.
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