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Influence of Modification Time and High Frequency Ultrasound Irradiation on Self-Assembling of Alkylphosphonic Acids on Stainless Steel: Electrochemical and Spectroscopic Studies

Florian Roy, Abdeslam Et Taouil, Fabrice Lallemand, Jean-Marie Melot, Xavier Roizard, Olivier Heintz, Virginie Moutarlier, Jean-Yves Hihn

Ultrason Sonochem. 2016 Jan;28:269-275.

PMID: 26384908

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 8h 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 1h 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.

Chemicals Related in the Paper:

Catalog Number Product Name Structure CAS Number Price
AP4721179 Hexadecylphosphonic acid Hexadecylphosphonic acid 4721-17-9 Price
AP6874608 Decylphosphonic acid Decylphosphonic acid 6874-60-8 Price
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