Hydrogen bonding between adenine-modified surfaces and terminal thymine-functionalized polystyrene : influence of the surface adenine concentration on polymer recognition
The influence of the surface adenine concentration on the adhesion of terminal thymine-functionalized polystyrene (PS-thymine) to a silicon surface that was modified with adenine-functionalized triethoxysilane (ADPTES) was investigated. The surface adenine concentration was systematically varied via...
| Publié dans: | Langmuir : the ACS journal of surfaces and colloids. - 1985. - 25(2009), 12 vom: 16. Juni, Seite 6808-12 |
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| Auteur principal: | |
| Autres auteurs: | , |
| Format: | Article en ligne |
| Langue: | English |
| Publié: |
2009
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| Accès à la collection: | Langmuir : the ACS journal of surfaces and colloids |
| Sujets: | Journal Article Research Support, U.S. Gov't, Non-P.H.S. Polystyrenes Adenine JAC85A2161 Thymine QR26YLT7LT |
| Résumé: | The influence of the surface adenine concentration on the adhesion of terminal thymine-functionalized polystyrene (PS-thymine) to a silicon surface that was modified with adenine-functionalized triethoxysilane (ADPTES) was investigated. The surface adenine concentration was systematically varied via co-deposition of a non-hydrogen-bonding diluent. Two different silanes, i.e., 2-diphenylphosphinoethyl triethoxysilane (DPPETES) and 3-mercaptopropyl triethoxysilane (MPTES), were used as the diluents. The compositions of the silicon surfaces modified with different ratios of ADPTES/DPPETES were determined using X-ray photoelectron spectroscopy (XPS) and agreed well with the ADPTES/DPPETES molar ratios in solution. XPS and water contact-angle measurements revealed that modification of surfaces exclusively with the diluents or with a very low concentration of adenine did not result in significant PS-thymine attachment. However, as the adenine concentration on the surface increased, PS-thymine adsorption also increased, passing through a maximum before decreasing with a further increase in the adenine concentration. Surfaces modified exclusively with adenine showed negligible polymer attachment. A similar non-monotonic trend in PS-thymine adsorption was observed for surfaces that were modified with a mixture of ADPTES and MPTES, where PS-thymine adsorption was found to go through a maximum at a particular adenine concentration. A further increase in adenine concentration led to decreased polymer adsorption, and an exclusive presence of adenine was again found to promote negligible polymer adsorption |
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| Description: | Date Completed 17.08.2009 Date Revised 21.11.2013 published: Print Citation Status MEDLINE |
| ISSN: | 1520-5827 |
| DOI: | 10.1021/la803453v |