Empirical Evidence for Roughness-Dependent Limit in Observation of Odd–Even Effect in Wetting Properties of Polar Liquids on n-Alkanethiolate Self-Assembled Monolayers

dc.contributor.author Wang, Zhengjia
dc.contributor.author Chen, Jiahao
dc.contributor.author Thuo, Martin
dc.contributor.author Oyola-Reynoso, Stephanie
dc.contributor.author Thuo, Martin
dc.contributor.department Materials Science and Engineering
dc.contributor.department Center for Bioplastics and Biocomposites
dc.date 2018-02-18T18:56:36.000
dc.date.accessioned 2020-06-30T06:07:36Z
dc.date.available 2020-06-30T06:07:36Z
dc.date.copyright Fri Jan 01 00:00:00 UTC 2016
dc.date.issued 2016-01-01
dc.description.abstract <p>Substrate roughness influences the wetting properties of self-assembled monolayers (SAMs), but details on this dependency at the sub-nanometer level are still lacking. This study investigates the effect of surface roughness on interfacial properties of <em>n</em>-alkanethiolate SAMs, specifically wetting, and confirms the predicted limit to the observation of the odd–even effect in hydrophobicity. This article studies static contact angles of polar and nonpolar probe liquids on a series of <em>n</em>-alkanethiolate SAMs on surfaces with tunable roughness. We prepared Ag surfaces with root-mean-square roughness (<em>R</em>rms) of ∼0.6–2.2 nm and compared the wetting properties of <em>n</em>-alkanethiolate SAMs fabricated on these surfaces. We measured the static contact angles, θs, formed between SAM and probe liquids [water, glycerol, and hexadecane]. Hexadecane showed an odd–even effect on all surfaces irrespective of the degree of roughness. Polar liquids (water and glycerol), however, showed a dependency on the roughness of the substrate with an odd–even effect observable only on smooth, but not rougher (<em>R</em>rms ≥ 1.15 nm), surfaces. These results confirm that the previously predicted limit to observation of the odd–even effect in hydrophobicity (here extended to polar liquids) is real. From the results with glycerol, we infer that this limit is not limited just to hydrophobicity but may extend to other polar liquids. Results from hexadecane, however, suggest that this limit may not be a universal property of the SAM.</p>
dc.description.comments <p>This article is reprinted with permission from Wang, Zhengjia, Jiahao Chen, Stephanie Oyola-Reynoso, and Martin Thuo. "Empirical evidence for roughness-dependent limit in observation of odd–even effect in wetting properties of polar liquids on n-alkanethiolate self-assembled monolayers." <em>Langmuir</em> 32, no. 32 (2016): 8230-8237, doi:<a href="http://dx.doi.org/10.1021/acs.langmuir.6b02159" target="_blank">10.1021/acs.langmuir.6b02159</a>. Copyright 2016 American Chemical Society.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/mse_pubs/239/
dc.identifier.articleid 1244
dc.identifier.contextkey 10543612
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath mse_pubs/239
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/55572
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/mse_pubs/239/0-2016_Thuo_EffectSubstrate_License.pdf|||Fri Jan 14 22:50:01 UTC 2022
dc.source.bitstream archive/lib.dr.iastate.edu/mse_pubs/239/2016_Thuo_EmpiricalEvidence.pdf|||Fri Jan 14 22:50:02 UTC 2022
dc.source.uri 10.1021/acs.langmuir.6b02159
dc.subject.disciplines Biology and Biomimetic Materials
dc.subject.disciplines Materials Science and Engineering
dc.subject.disciplines Polymer and Organic Materials
dc.title Empirical Evidence for Roughness-Dependent Limit in Observation of Odd–Even Effect in Wetting Properties of Polar Liquids on n-Alkanethiolate Self-Assembled Monolayers
dc.type article
dc.type.genre article
dspace.entity.type Publication
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relation.isOrgUnitOfPublication bf9f7e3e-25bd-44d3-b49c-ed98372dee5e
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