Pool　boiling　heat　transfer　characteristics　of　nanofluids　in　nucleate　pool　boiling　have　been　experimentally　investigated　on　a　horizontal　flat　square　copper　surface　at　10-200　kW/m(2)　heat　fluxes　under　atmospheric　pressure.　The　surface　roughness　has　been　controlled　by　sandpaper　of　grade　#2000　before　boiling.　The　nanofluids　have　been　prepared　by　suspending　delta-Al2O3　nanoparticles　in　base　fluids　refrigerant　141b　(R141b)　at　concentrations　of　0.001　vol.%,　0.01　vol.%　and　0.1　vol.%　with　and　without　surfactant　SDBS.　The　results　show　that　the　suspended　delta-Al2O3　nanoparticles　enhance　the　pool　boiling　heat　transfer　characteristics　for　R141b　at　concentrations　of　0.001　vol.%　and　0.01　vol.%　with　and　without　the　surfactant　SDBS.　However,　the　delta-Al2O3　nanoparticles　deteriorate　the　pool　boiling　heat　transfer　characteristics　at　0.1　vol.%　concentration　without　the　surfactant　SDBS　due　to　the　large　quantity　of　deposition　of　nanopartides.　When　the　particle　concentration　is　0.001　vol.%,　the　addition　of　the　SDBS　decreases　the　enhancement　of　the　boiling　heat　transfer　characteristics　by　nanoparticles,　when　the　particle　concentrations　are　0.01　vol.%　and　0.1　vol.%,　the　addition　of　the　SDBS　increases　the　enhancement　of　the　boiling　heat　transfer　characteristics　by　nanoparticles.　(C)　2013　Elsevier　Inc.　All　rights　reserved.