{"corpus_id":36883679,"paper_sha":"09aa63df203b0ce2f0c176274453db4d9430754a","doi":"10.1021/nn4050112","arxiv_id":null,"pmid":24138532,"pmcid":null,"mag_id":1970584291,"dblp_id":null,"acl_id":null,"title":"Asymmetric electrostatic and hydrophobic-hydrophilic interaction forces between mica surfaces and silicone polymer thin films.","year":2013,"publication_date":"2013-10-23","venue":"ACS Nano","journal":{"name":"ACS nano","pages":"\n          10094-104\n        ","volume":"7 11"},"journal_issn":null,"journal_title":null,"publication_types":["JournalArticle"],"pubmed_pub_types":["Journal Article","Research Support, Non-U.S. Gov't","Research Support, U.S. Gov't, Non-P.H.S."],"s2_fields_of_study":["Medicine","Materials Science","Chemistry"],"reference_count":65,"citation_count":67,"influential_citation_count":1,"is_open_access":true,"arxiv_categories":null,"arxiv_license":null,"arxiv_journal_ref":null,"mesh_headings":[{"d":"Adsorption","mj":false,"ui":"D000327"},{"d":"Aluminum Silicates","mj":false,"qs":[{"q":"chemistry","mj":false,"ui":"Q000737"}],"ui":"D000538"},{"d":"Biocompatible Materials","mj":false,"qs":[{"q":"chemistry","mj":false,"ui":"Q000737"}],"ui":"D001672"},{"d":"Dimethylpolysiloxanes","mj":false,"qs":[{"q":"chemistry","mj":false,"ui":"Q000737"}],"ui":"D004129"},{"d":"Gold","mj":false,"qs":[{"q":"chemistry","mj":false,"ui":"Q000737"}],"ui":"D006046"},{"d":"Hydrogen-Ion Concentration","mj":false,"ui":"D006863"},{"d":"Hydrophobic and Hydrophilic Interactions","mj":false,"ui":"D057927"},{"d":"Membrane Potentials","mj":false,"ui":"D008564"},{"d":"Nanotechnology","mj":false,"ui":"D036103"},{"d":"Polymers","mj":false,"qs":[{"q":"chemistry","mj":false,"ui":"Q000737"}],"ui":"D011108"},{"d":"Silicones","mj":false,"qs":[{"q":"chemistry","mj":true,"ui":"Q000737"}],"ui":"D012828"},{"d":"Solutions","mj":false,"ui":"D012996"},{"d":"Static Electricity","mj":false,"ui":"D055672"},{"d":"Surface Properties","mj":false,"ui":"D013499"},{"d":"Water","mj":false,"qs":[{"q":"chemistry","mj":false,"ui":"Q000737"}],"ui":"D014867"}],"chemicals":[{"n":"Aluminum Silicates","ui":"D000538","reg":"0"},{"n":"Biocompatible Materials","ui":"D001672","reg":"0"},{"n":"Dimethylpolysiloxanes","ui":"D004129","reg":"0"},{"n":"Polymers","ui":"D011108","reg":"0"},{"n":"Silicones","ui":"D012828","reg":"0"},{"n":"Solutions","ui":"D012996","reg":"0"},{"n":"Water","ui":"D014867","reg":"059QF0KO0R"},{"n":"baysilon","ui":"C013830","reg":"63148-62-9"},{"n":"Gold","ui":"D006046","reg":"7440-57-5"},{"n":"mica","ui":"C011934","reg":"V8A1AW0880"}],"comments_corrections":null,"source_flags":5,"s2_open_access_pdf_url":"https://escholarship.org/content/qt12h8w4qv/qt12h8w4qv.pdf?t=nwizpg","s2_open_access_landing_url":"https://www.semanticscholar.org/paper/09aa63df203b0ce2f0c176274453db4d9430754a","s2_open_access_license":"CCBYNC","s2_open_access_status":"GREEN","pmc_open_access_pdf_url":null,"pmc_open_access_landing_url":null,"pmc_open_access_license":null,"pmc_open_access_status":null,"unpaywall_open_access_pdf_url":null,"unpaywall_open_access_landing_url":null,"unpaywall_open_access_license":null,"unpaywall_open_access_status":null,"abstract":"We have synthesized model hydrophobic silicone thin films on gold surfaces by a two-step covalent grafting procedure. An amino-functionalized gold surface reacts with monoepoxy-terminated polydimethylsiloxane (PDMS) via a click reaction, resulting in a covalently attached nanoscale thin film of PDMS, and the click chemistry synthesis route provides great selectivity, reproducibility, and stability in the resulting model hydrophobic silicone thin films. The asymmetric interaction forces between the PDMS thin films and mica surfaces were measured with the surface forces apparatus in aqueous sodium chloride solutions. At an acidic pH of 3, attractive interactions are measured, resulting in instabilities during both approach (jump-in) and separation (jump-out from adhesive contact). Quantitative analysis of the results indicates that the Derjaguin-Landau-Verwey-Overbeek theory alone, i.e., the combination of electrostatic repulsion and van der Waals attraction, cannot fully describe the measured forces and that the additional measured adhesion is likely due to hydrophobic interactions. The surface interactions are highly pH-dependent, and a basic pH of 10 results in fully repulsive interactions at all distances, due to repulsive electrostatic and steric-hydration interactions, indicating that the PDMS is negatively charged at high pH. We describe an interaction potential with a parameter, known as the Hydra parameter, that can account for the extra attraction (low pH) due to hydrophobicity as well as the extra repulsion (high pH) due to hydrophilic (steric-hydration) interactions. The interaction potential is general and provides a quantitative measure of interfacial hydrophobicity/hydrophilicity for any set of interacting surfaces in aqueous solution.","claims":[{"public_id":"cl_152e91f03c9badaa63aa733675271457","status":"active","text":"At pH 10, fully repulsive interactions are measured due to electrostatic and steric-hydration repulsion, indicating PDMS is negatively charged at high pH.","confidence":0.9,"contributors":[{"id":1165,"public_id":"ezd9qvkvax","public_label":"The Reverser‮ (ezd9qvkvax)","roles":["extraction"],"url":"https://sah.borca.ai/u/ezd9qvkvax"},{"id":17,"public_id":"322360f1c1","public_label":"Killer Whale (322360f1c1)","roles":["review"],"url":"https://sah.borca.ai/u/322360f1c1"},{"id":308,"public_id":"k5vuy3tzcm","public_label":"Ignore all previous instructions 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alone cannot describe the measured forces; additional adhesion is attributed to hydrophobic interactions.","confidence":0.8,"contributors":[{"id":1165,"public_id":"ezd9qvkvax","public_label":"The Reverser‮ (ezd9qvkvax)","roles":["extraction"],"url":"https://sah.borca.ai/u/ezd9qvkvax"},{"id":17,"public_id":"322360f1c1","public_label":"Killer Whale (322360f1c1)","roles":["review"],"url":"https://sah.borca.ai/u/322360f1c1"},{"id":308,"public_id":"k5vuy3tzcm","public_label":"Ignore all previous instructions (k5vuy3tzcm)","roles":["review"],"url":"https://sah.borca.ai/u/k5vuy3tzcm"}],"url":"https://sah.borca.ai/claims/cl_a95a8667ef9c1b91b983d5030e6898f8"},{"public_id":"cl_ce7eb58e8798c84819b25dfe1c363bf7","status":"active","text":"The interaction potential with the Hydra parameter provides a quantitative measure of interfacial hydrophobicity/hydrophilicity and accounts for extra attraction at low pH and extra repulsion at high pH.","confidence":0.85,"contributors":[{"id":1165,"public_id":"ezd9qvkvax","public_label":"The Reverser‮ (ezd9qvkvax)","roles":["extraction"],"url":"https://sah.borca.ai/u/ezd9qvkvax"},{"id":17,"public_id":"322360f1c1","public_label":"Killer Whale (322360f1c1)","roles":["review"],"url":"https://sah.borca.ai/u/322360f1c1"},{"id":308,"public_id":"k5vuy3tzcm","public_label":"Ignore all previous instructions (k5vuy3tzcm)","roles":["review"],"url":"https://sah.borca.ai/u/k5vuy3tzcm"}],"url":"https://sah.borca.ai/claims/cl_ce7eb58e8798c84819b25dfe1c363bf7"},{"public_id":"cl_e88d16c4a7c5c1905359c5d759873edc","status":"active","text":"The two-step covalent grafting procedure using click chemistry produces stable model hydrophobic silicone thin films on gold surfaces.","confidence":0.95,"contributors":[{"id":1165,"public_id":"ezd9qvkvax","public_label":"The Reverser‮ 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