Changes in the interaction characteristics of polyelectrolyte complex covered silica surfaces |
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| Institution: | 1. Jiangsu Vocational Institute of Architectural Technology, Xuzhou 221116, Jiangsu, China;2. Xuzhou Intelligent Machine Vision Engineering and Technology Center, Xuzhou 221116, Jiangsu, China;3. Department of Mathematics, College of Science, King Saud University, Riyadh 11451, Saudi Arabia;4. Department of Science and Environmental Studies, Lakehead University, Thunder Bay, ON P7B 5E1, Canada;5. Department of Mathematical and Computer Modeling, Al-Farabi Kazakh National University, Almaty, Kazakhstan;6. Department of Mathematical and Computer Modeling, Kazakh-British Technical University, Almaty, Kazakhstan;7. Future Technology Research Center, National Yunlin University of Science and Technology, 123 University Road, Section 3, Douliou, Yunlin 64002, Taiwan, ROC;1. Department of New Materials and Biosystems, Max Planck Institute for Intelligent Systems, Heisenbergstr. 3, D-70569 Stuttgart, Germany;2. Department of Biophysical Chemistry, University of Heidelberg, INF 253, D-69120 Heidelberg, Germany;3. CNRS-UMR 5628, LMGP, 3 parvis L.Néel, F-38 016 Grenoble, France;4. University Grenoble Alpes, Grenoble Institute of Technology, LMGP, 3 parvis Louis Néel, F-28016 Grenoble, France;5. INSERM U823, ERL CNRS5284, Université de Grenoble Alpes, Institut Albert Bonniot, Site Santé, BP170, 38042 Grenoble cedex 9, France;1. Key Laboratory for Ultrafine Materials of Ministry of Education, East China University of Science and Technology, Shanghai 200237, China;2. School of Life Sciences, Guangzhou University, Guangzhou 510006, China;3. Engineering Research Center for Biomedical Materials of Ministry of Education, East China University of Science and Technology, Shanghai 200237, China |
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| Abstract: | The adsorption of polyelectrolyte complexes, PEC, made from the cationic poly (diallyldimethylammonium) chloride (PDADMAC) and the anionic maleic acid-co-propene copolymer (MA-P) on a Si-wafer surface has been studied. The application of highly diluted colloidally dispersed PEC solutions led to the deposition of single PEC particles onto the surface of the Si-wafer. The interaction forces of the heterogeneously covered surface were monitored by direct force measurements with an atomic force microscope (AFM) in the force volume mode. On the surface of a single PEC particle drastic changes in the interaction forces were found in comparison with the unmodified Si-wafer: in all force vs. distance curves a strong increase of the adhesion was measured that can be attributed to the formation of electrostatic bonds between the negatively charged Si3N4-tip and the cationic excess charge of the PEC. Additionally, the behavior during approach of both surfaces has been distinct: at pH 6.1 we see a long range electrostatic attraction between the tip and the PEC particle. The attraction becomes even stronger at pH 4.1, because of an increased positive net charge. Generally, a heterogeneous surface with a wide variety of interaction features can be created by the adsorption of PEC particles. |
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