An experimental study was performed to investigate the nucleate boiling and critical heat flux (CHF) of water and FC-72 dielectric liquid on hydrophilic titanium oxide (TiO2) nanoparticle modified Surface A 1 cm(2) copper heater with 1 mu m thick TiO2 Coating Was utilized in saturated pool boiling tests with water and highly-wetting FC-72. and its performance was compared to that of a smooth surface Results showed that TiO2 coated surface increased CHF by 50.4% and 38 2% for water and FC-72. respectively, and therefore indicated that boiling performance enhancement depends on the level of wettability improvement. A silicon oxide (SiO2) coated surface, exhibiting similar surface topology, was tested to isolate the roughness related enhancement from the overall enhancement. Data confirmed that hydrophilicity of TiO2 coated Surface provides an additional mechanism for boiling enhancement (C) 2010 Elsevier Ltd. All rights reserved