Abstract
Anionic surfactants based on fatty acids are usually used to modify the particle surface properties of CaCO3 with the aim to enhance its dispersion and compatibility with polymer matrices. In this study sodium oleate was used for the preparation of ultrahydrophobic CaCO3 nanoparticles using a wet carbonation route. The effect of sodium oleate on the characteristics, particle size, morphology, surface potential, thermal decomposition and hydrophobicity of CaCO3, was investigated using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), Zeta potential, thermogravimetric analysis (TGA) and water contact angle measurement (WCA). The results showed that the addition of 2 wt% sodium oleate helps in reducing the particle size from 2 μm length scalenohedral particles to 45 nm rhombohedral particles and modifying of the hydrophobic property of CaCO3.
Highlights
Calcium carbonate nanoparticles have received much attention owing to its wide industrial applications such as paper, rubber, plastics, and paints industries
X-ray diffraction (XRD) 3 results indicate that the overall crystalline structure and phase purity of the CaCO3 particles were obtained
The broad absorption peaks at 3445 cm‒1 are assigned to stretching vibration and asymmetric stretching vibration of O―H bond and it can be attributed to the presence of absorbed water and hydroxyl groups on the surface of CaCO3 particles
Summary
Calcium carbonate nanoparticles have received much attention owing to its wide industrial applications such as paper, rubber, plastics, and paints industries. Ultra-fine CaCO3 could be produced using the wet carbonation by adding surfactants and controlling the precipitation conditions, such as initial Ca(OH) concentration, CO2 flow rate, temperature, pH and stirring rate [2]. Anionic surfactants such as fatty acids and their sodium salts are widely used in industry for economic reasons. Such surfactants influence the CaCO3 nucleation, crystal growth, grain shapes, and control the formation of crystal phases that are not usually stabilized under natural environments.
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