Singh, Jitendra Pal Lim, Weon Cheol Won, Sung Ok Kim, Sang Ok Chae, Keun Hwa 2024-01-20T03:02:43Z 2024-01-20T03:02:43Z 2021-09-04 2016-11 1533-4880 https://pubs.kist.re.kr/handle/201004/123507 Calcite nanoparticles were synthesized using modified sol-gel method starting from calcium nitrate. Annealing of precursor at 0, 300, and 400 degrees C leads to the formation of amorphous phase of calcium carbonate. At 500 degrees C, amorphous phase converted into calcite phase of calcium carbonate, which retains at 600 degrees C. At higher temperature, mixed phases of calcium hydroxide and calcium oxide appear along with the calcite phase. Calcite nanoparticles synthesized at 500 and 600 degrees C exhibit particle size of 23 and 43 nm, respectively. X-ray absorption spectroscopy measurements performed on these materials show that electronic structure is sensitive to crystalline and amorphous calcite phase, however it is almost insensitive to mixed calcite phases present in the mixture of CaO and Ca(OH)(2). Moreover, C K-edge spectra infer about the attached water molecules with calcite. English AMER SCIENTIFIC PUBLISHERS CARBONATE GROWTH XANES WATER MORPHOLOGY REMOVAL SPECTRA ACID EDGE Synthesis and Local Electronic Structure of Calcite Nanoparticles Article 10.1166/jnn.2016.13523 1 JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, v.16, no.11, pp.11429 - 11433 JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY 16 11 11429 11433 scie scopus 000387278200059 2-s2.0-84992490615 Chemistry, Multidisciplinary Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Science & Technology - Other Topics Materials Science Physics Article CARBONATE GROWTH XANES WATER MORPHOLOGY REMOVAL SPECTRA ACID EDGE Calcite Nanoparticles Amorphous Phase Electronic Structure