Incorporation of hydrophobic silica in a polyvinylidene fluoride membrane: Membrane development and performance modeling by Gan, Grace Sze Yin, Nur Fatin Aqilah, Nur Fatin Aqilah, Mat Nawi, Normi Izati, Mohd. Hizam, Shafiq, Md. Nordin, Nik Abdul Hadi, Bilad, Muhammad Roil, Adi Putra, Zulfan, Jaafar, Juhana, Yusof, Norhaniza, Abdul Hamid, Nurfaizey, Mohd. Mokhtar, Nadzirah