start-ver=1.4 cd-journal=joma no-vol=49 cd-vols= no-issue=10 article-no= start-page=3388 end-page=3391 dt-received= dt-revised= dt-accepted= dt-pub-year=2011 dt-pub=201108 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Superhydrophilicity on nano-rough carbon surfaces achieved by hyperthermal oxygen-atom beam exposure en-subtitle= kn-subtitle= en-abstract= kn-abstract=In order to investigate a method to increase hydrophilicity on nano-rough carbon surfaces, a nano-rough surface of C(60) film and an atomically flat surface of highly oriented pyrolytic graphite (HOPG) were oxidized by hyperthermal oxygen-atom beam exposure and the hydrophilicities of the surfaces were investigated. Superhydrophilicity were achieved on these exposed carbon surfaces, which had low O/C ratio of approximately 28% and surface roughness (Ra) of approximately 3 nm. The direct oxidations on sp(2) bonded carbon atoms (basal plane) of these two carbon materials by the exposure of hyperthermal O-atom beam would contribute the superhydrophilicity. en-copyright= kn-copyright= en-aut-name=KinoshitaHiroshi en-aut-sei=Kinoshita en-aut-mei=Hiroshi kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=NakayamaTakashi en-aut-sei=Nakayama en-aut-mei=Takashi kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=MatsumotoNaohiro en-aut-sei=Matsumoto en-aut-mei=Naohiro kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= en-aut-name=OhmaeNobuo en-aut-sei=Ohmae en-aut-mei=Nobuo kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=4 ORCID= affil-num=1 en-affil= kn-affil=Department of Mechanical Engineering, Faculty of Engineering, Okayama University affil-num=2 en-affil= kn-affil=Department of Mechanical Engineering, Faculty of Engineering, Okayama University affil-num=3 en-affil= kn-affil=Department of Mechanical Engineering, Faculty of Engineering, Okayama University affil-num=4 en-affil= kn-affil=Department of Mechanical Engineering, Faculty of Engineering, Okayama University END