Papers by Dr. Aniedi Nyong
Academia Materials Science, Nov 21, 2023
A combination of thermal oxidation and chemical modification has been applied in making a superh... more A combination of thermal oxidation and chemical modification has been applied in making a superhydrophobic surface on Cu-32.02%Zn-2.30%Pb alloy. The thermal oxidation was initiated in air and the chemical modification of the oxide surface was effected in 0.005 M solution of arachidic acid. Evaluation of the surfaces after the surface modification was done with SEM, XRD, FT-IR, and contact angle measurement tools. From the XRD studies, the presence of ZnO and PbO were confirmed on the oxidized surfaces. Equally from the XRD and FT-IR tools, it was confirmed that the arachidates of zinc and lead were the products formed after the chemical modification. These products existed in various nanostructural forms on the copper alloy surface. The average contact angles of water measured after the chemical modification step were 153.73 ± 7.35 and 144.94 ± 0.78 for the samples modified in 0.005 M arachidic acid for 6 and 12 hours respectively. Keywords: Copper alloy; arachidate; anti-wetting; superhydrophobicity; thermal oxidation.
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
International Journal of Metallurgy and Metal Physics
Bookmarks Related papers MentionsView impact
Applied Sciences, 2014
Bookmarks Related papers MentionsView impact
Langmuir, 2011
The lotus effect involving roughness-induced superhydrophobicity is a way to design nonwetting, s... more The lotus effect involving roughness-induced superhydrophobicity is a way to design nonwetting, self-cleaning, omniphobic, icephobic, and antifouling surfaces. However, such surfaces require micropatterning, which is extremely vulnerable to even small wear rates. This limits the applicability of the lotus effects to situations when wear is practically absent. To design sustainable superhydrophobic surfaces, we suggest using metal matrix composites (MMCs) with hydrophobic reinforcement in the bulk of the material, rather than only at its surface. Such surfaces, if properly designed, provide roughness and heterogeneity needed for superhydrophobicity. In addition, they are sustainable, since when the surface layer is deteriorated and removed due to wear, hydrophobic reinforcement and roughness remains. We present a model and experimental data on wetting of MMCs. We also conducted selected experiments with graphite-reinforced MMCs and showed that the contact angle can be determined from the model. In order to decouple the effects of reinforcement and roughness, the experiments were conducted for initially smooth and etched matrix and composite materials.
Bookmarks Related papers MentionsView impact
Advanced Materials, 2012
Bookmarks Related papers MentionsView impact
Uploads
Papers by Dr. Aniedi Nyong