1. Department of Chemical Engineering, KU Leuven, Celestijnenlaan 200F, B-3001 Leuven, Belgium
2. Department of Chemical Engineering, Mulawarman University, Jalan Sambaliung No. 9, Sempaja Selatan, Samarinda, Kalimantan Timur 75119, Indonesia
3. Laboratory of Solid-State Physics and Magnetism, Department of Physics and Astronomy, K.U. Leuven, Celestijnenlaan 200D, B-3001 Leuven, Belgium
4. Faculty of Engineering and the Built Environment, Tshwane University of Technology, Private Bag X680, Pretoria 0001, South Africa