1 Oil-water emulsion formationan overview 2 Environmental impact of nanomaterials 3 Principles of oil-water separation strategies 4 Nanotechnology for remediation of oilfield and refineries wastewater 5 Fiber membranes for oil/water separation 6 Carbon-based nanomaterials (graphene and graphene oxide, carbon nanotubes, and carbon nanofibers) for oil-water separation 7 Chitosan-based composites for oil-contaminated water treatment 8 Membrane-based hybrid materials for oil/water separation 9 Electrospun nanofibers-based membranes for oil-water treatment 10 Application of electrospun fibers for oil/water separation 11 Electrospun fibers: promising materials for oil water separation 12 Regeneration/reuse capability of monolithic carbon xerogels-metal nanocomposites for crude oil removal from oil-in-saltwater emulsions 13 Toxicity of nanomaterials used in oilwater separation 14 Overview of demulsification techniques in the petroleum industry 15 Nanomaterials: fundamentals and applications 16 Bio-based aerogel absorbents for oil-water separation 17 Applications of superwettable materials for oil and water separation 18 The role of redox agents in oilwater separation 19 Magnetic polymer hybrid substances for water/oil separation 20 Bio-adsorbents for water-oil separation