Publication date: 15 April 2015
Source:Journal of Crystal Growth, Volume 416
Author(s): Takashi Nishio , Kensuke Naka
Photoinduced crystallization of calcium carbonate (CaCO3 ) was demonstrated by the photodecarboxylation of ketoprofen (KP, 2-(3-benzoylphenyl)propionic acid) under alkaline conditions (pH 10). In this method, a homogeneous solution comprising KP, calcium chloride, ammonia, and partially hydrolyzed poly(vinyl alcohol) (PVAPS , degree of saponification: 86.5–89.0 mol %) was used as the precursor solution and was exposed to ultraviolet (UV) irradiation for different time periods. Thermogravimetric analysis of the obtained xerogels showed that increasing the UV irradiation time increased the amount of CaCO3 formed and the complete conversion of calcium ions to calcite was achieved after 50 min of UV irradiation. Furthermore, solid phase analyses suggested that nanometer-to-micron-sized calcite crystals were formed and dispersed in the obtained PVAPS matrix.
Source:Journal of Crystal Growth, Volume 416
Author(s): Takashi Nishio , Kensuke Naka