Influence of modification time and high frequency ultrasound irradiation on self-assembling of alkylphosphonic acids on stainless steel: Electrochemical and spectroscopic studies |
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| Institution: | 1. Institut UTINAM, UMR 6213 CNRS, Université de Franche-Comté, 30 Avenue de l’Observatoire, 25009 Besançon Cedex, France;2. Institut FEMTO-ST, UMR 6174 CNRS, Université de Franche-Comté, 26, Chemin de l’Epitaphe, 25030 Besançon Cedex, France;3. ICB Laboratory, UMR 6303 CNRS, Université de Bourgogne, 9, Av. Alain Savary, 21078 Dijon Cedex, France;1. Computational Chemistry Research Group, Ton Duc Thang University, Ho Chi Minh City, Viet Nam;2. Faculty of Applied Sciences, Ton Duc Thang University, Ho Chi Minh City, Viet Nam;3. Department of Applied Chemistry and Institute of Natural Sciences, Kyung Hee University, Gyeonggi-do 446-701, South Korea;4. Faculty of Chemistry, University of Science, Vietnam National University, Ho Chi Minh City, Viet Nam;5. New Industry Creation Hatchery Center, Tohoku University, Sendai 980-8579, Japan;6. Theory and Modeling Department, Culham Centre for Fusion Energy, United Kingdom Atomic Energy Authority, Abingdon OX14 3DB, United Kingdom;1. National Research Centre, Electrochemistry Laboratory, Dokki, Cairo 12622, Egypt;2. Energy Materials Laboratory, Physics Department, School of Sciences and Engineering, The American University in Cairo, P.O. Box 74, New Cairo 11835, Egypt;1. Institute of Nuclear Physics, Polish Academy of Science, 31-342 Krakow, Poland;2. Department of Chemistry, Hankuk University of Foreign Studies, Yongin, Kyunggi-Do 449-791, Republic of Korea, Republic of Korea;3. Faculty of Foundry Engineering, AGH University of Science and Technology, 30-059 Krakow, Poland;1. Laboratorio de Propiedades Ópticas de Materiales (POM). Universidad Nacional de Colombia Sede Manizales, Manizales, Caldas 127, Colombia;2. Línea Biología Molecular y Salud (BIMSA)-Grupo Neuroaprendizaje. Universidad Autónoma de Manizales, Manizales, Caldas, Colombia;3. Department of Physics and Astronomy, The University of Texas at San Antonio, 1 UTSA Circle, San Antonio, Texas 78249, USA;1. Institute of Applied Physics, Academic Str. 5, Chisinau MD-2028, Republic of Moldova;2. Nordic Institute for Theoretical Physics (NORDITA) KTH and Stockholm University, Roslagstullsbacken 23, Stockholm SE-106 91, Sweden |
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| Abstract: | Self-assembly of alkylphosphonic acids on stainless steel was investigated under different conditions. Four different alkylphosphonic acids exhibiting alkyl chain of various size were synthesized and studied: butylphosphonic acid (C4P), octylphosphonic acid (C8P), decylphosphonic acid (C10P), and hexadecylphosphonic acid (C16P). Electrochemistry experiments were extensively carried out in order to determine electrochemical surface blocking of adsorbed layers in function of grafting time. In term of surface blocking, an 8 h modification time was optimal for all alkylphosphonic acids. Longer immersion times lead to degradation of adsorbed layers. For the first time, grafting of C16P was studied under high frequency ultrasound irradiation. Interestingly, grafting process is highly accelerated under sonication and well-covering C16P modified substrates are obtained after 1 h of immersion under ultrasound irradiation. This would allow to elaborate high-quality alkylphosphonic acids modified samples within much shorter times. Water contact angles measurements and X-ray Photoelectrons Spectroscopy (XPS) confirmed presence of adsorbed alkylphosphonic acids on stainless steel surface. A very tight link between electrochemical blocking, surface hydrophobicity and species chemical grafting was established. |
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| Keywords: | Self-assembly Alkylphosphonic acid Stainless steel Cyclic voltammetry High frequency ultrasound |
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