Unravelling the anisotropic wetting properties of banana leaves with water and human urine

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dc.contributor.author Prajapati, Deepak
dc.contributor.author Rowthu, Sriharitha
dc.coverage.spatial United States of America
dc.date.accessioned 2022-01-28T07:49:27Z
dc.date.available 2022-01-28T07:49:27Z
dc.date.issued 2022-04
dc.identifier.citation Prajapati, Deepak and Rowthu, Sriharitha, “Unravelling the anisotropic wetting properties of banana leaves with water and human urine”, Surfaces and Interfaces, DOI: 10.1016/j.surfin.2022.101742, vol. 29, Apr. 2022. en_US
dc.identifier.issn 2468-0230
dc.identifier.uri https://doi.org/10.1016/j.surfin.2022.101742
dc.identifier.uri https://repository.iitgn.ac.in/handle/123456789/7427
dc.description.abstract We report the heterogeneous and anisotropic wetting behaviors of Banana (Musa) leaves on adaxial (top) and abaxial (bottom) surfaces with water and human urine. Both surfaces comprise of varying number densities of micro ridges, micro stomata, micro flakes and nano hairs while the adaxial surface also constitutes discrete visible crest lines. The Wenzel roughness on abaxial and non-crest adaxial are 1.5 ± 0.05 and 1.18 ± 0.008, respectively as measured by combining optical profilometry and atomic force microscopy. A key scientific development in this work is to incorporate the measured Wenzel roughness in the surface energy estimations using Neumann's, Owens-Wendt-Rabel-Kaelble (OWRK) and Wu's models. The surface energy is 29 ± 2 mJ/m2 (OWRK) and 26 ± 1 mJ/m2 (Wu) on the adaxial surface. Nevertheless, the abaxial surfaces are characterized by smaller surface energy values of 20 ± 4 mJ/m2 (OWRK) and 24 ± 3 mJ/m2 (Wu). The measured static contact angles with water and urine are 110 ± 4° and 88 ± 4° (crest line), 130 ± 4° and 107 ± 5° (non-crest adaxial), 121 ± 4° and 120 ± 2° (abaxial) indicating hydrophobicity and urine-phobicity. The water droplets (2.5 to 10 µl) exhibited anisotropic dynamic wettability as they only rolled off parallel to the micro-ridges but stuck when slid perpendicular to the ridges even for specimen tilts up to 90°. Thus, this study unravels the anisotropic wettability of banana leaves due to the presence of micro-ridges which can be biomimicked for providing anisotropic liquid gliding. Also, this can aid in designing the spraying conditions of urine as a natural pesticide/fertilizer in the banana orchards.
dc.description.statementofresponsibility by Deepak Prajapati and Sriharitha Rowthu
dc.format.extent vol. 29
dc.language.iso en_US en_US
dc.publisher Elsevier en_US
dc.subject Banana leaves en_US
dc.subject Anisotropic wetting en_US
dc.subject Human urine en_US
dc.subject Stomata en_US
dc.subject Ridges en_US
dc.subject Hydrophobicity en_US
dc.title Unravelling the anisotropic wetting properties of banana leaves with water and human urine en_US
dc.type Article en_US
dc.relation.journal Surfaces and Interfaces

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