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Synthesis of Nano Calcium Hydroxide in Aqueous Medium
Author(s) -
Samanta Aniruddha,
Chanda Dipak K.,
Das Pradip Sekhar,
Ghosh Jiten,
Mukhopadhyay Anoop Kumar,
Dey Arjun
Publication year - 2016
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.14023
Subject(s) - aragonite , calcium hydroxide , fourier transform infrared spectroscopy , scanning electron microscope , materials science , calcite , chemical engineering , aqueous solution , transmission electron microscopy , phase (matter) , precipitation , nanoparticle , rietveld refinement , particle size , mineralogy , analytical chemistry (journal) , nuclear chemistry , chemistry , nanotechnology , crystallography , crystal structure , organic chemistry , meteorology , engineering , composite material , physics
The present work reports a simple, inexpensive method for synthesis of calcium hydroxide [Ca( OH ) 2 ] nanoparticles ( CHNP s). The method involves chemical precipitation (CP) in aqueous medium at room temperature. Calcium nitrate dihydrate [Ca( NO 3 ) 2 .2H 2 O] and sodium hydroxide were used as precursors. The CHNP s were characterized by Fourier transform infrared (FTIR) spectroscopy, X‐ray diffraction (XRD), Rietveld analysis, field‐emission scanning electron microscopy (FE‐SEM) and transmission electron microscopy (TEM), BET surface area evaluation as well as particle size distribution analysis techniques. The results confirmed the synthesis of CHNP s as the major phase. The CHNP s exhibited an average size of about 350 nm. In addition, some calcite phase formed due to the inevitable carbonation process. A very minor amount of aragonite phase was also present. A schematically developed new qualitative model is proposed to explain the genesis and subsequent evolution of the various phases at the nanoscale. The model helps to identify the rate‐controlling step. It also highlights the implication of reaction kinetics control in synthesis of predesigned nanophase assembly.