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Poly(vinylidene fluoride) (PVDF) dual-layer hollow fiber membranes with porous layers were successfully prepared by simultaneous spinning of thermally induced phase separation (TIPS) and non-solvent induced phase separation (NIPS) through a triple orifice spinneret (TOS). The support layer was produced using a TIPS system from PVDF, with γ -butyrolactone (GBL) as the diluent. The...