Preparation of superhydrophobic nanocalcite crystals using Box–Behnken design |
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| Authors: | Said M El-Sheikh Ahmed Barhoum Samya El-Sherbiny Fatma Morsy Ayman Abdel-Hamid El-Midany Hubert Rahier |
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| Institution: | 1. Nanostructured Materials Division, Advanced Materials Department, CMRDI, P.O. Box 87, Helwan 11421, Cairo, Egypt;2. Department of Materials and Chemistry, Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium;3. Applied Chemistry, Chemistry Department, Faculty of Science, Helwan University, 11795 Helwan, Egypt;4. Faculty of Engineering, Mining, Petroleum and Metallurgical Department, Cairo University, Giza, Egypt |
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| Abstract: | Superhydrophobic nanocalcite crystals were prepared via an adjusted aqueous reaction of CaO, CO2 gas and sodium oleate. Box–Behnken design was used to optimize the preparation parameters such as CaO concentration, CO2 gas flow rate and surfactant concentration. The results revealed that the produced CaCO3 is indexed to the calcite phase. The crystallite size, particle size, morphology, hydrophobicity and surface charge of CaCO3 are significantly affected by changing the preparation parameters. The addition of sodium oleate helps in reducing the crystallite size from 101 nm to 48 nm, reducing the particle size from 1.5 μm length scalenohedral particles to 40 nm rhombohedral particles and modifying the properties of pure CaCO3 from highly hydrophilic to superhydrophobic. |
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| Keywords: | Corresponding author Nanocalcite crystals Bubbling carbonation Box–Behnken design Surface modification Hydrophobicity Particle surface charge |
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