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Towards the mechanism of electrochemical activity and self-healing of 1 wt% PTSA doped polyaniline in alkyd composite polymer coating: combined AFM-based studies
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface and Corrosion Science.ORCID iD: 0000-0001-5007-2705
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface and Corrosion Science.
KTH, School of Engineering Sciences (SCI), Applied Physics, Nanostructure Physics.
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface and Corrosion Science.ORCID iD: 0000-0002-4431-0671
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2016 (English)In: RSC Advances, ISSN 2046-2069, E-ISSN 2046-2069, Vol. 6, no 23, 19111-19127 p.Article in journal (Refereed) Published
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Text
Abstract [en]

A composite solvent-borne alkyd coating with 1 wt% p-toluene sulfonic acid (PTSA) doped polyaniline (PANI) was prepared. The mechanisms of electrochemical activity and self-healing properties of the composite coating were investigated by in situ atomic force microscopy (AFM), intermodulation AFM (ImAFM), electrochemical controlled (EC)-AFM combined with cyclic voltammetry (CV), Kelvin force microscopy (KFM), and Fourier transform infrared spectroscopy (FTIR), as well as open-circuit potential (OCP) and electrochemical impedance spectroscopy (EIS) methods. The ImAFM demonstrates the multiphase structure of the composite coating and a high compatibility between the doped PANI and alkyd matrix. The CV and EC-AFM results reveal a high electrochemical activity of the doped PANI in the composite coating as well as reversible redox reactions between the emeraldine salt (ES) and leuco emeraldine base (LB) forms. The Volta potential mapping of KFM demonstrates a strong self-healing ability of the doped PANI in air conditions. The good electrochemical connection between the fine network of PANI in the composite coating and metal surface underneath enable the occurrence of reversible redox reaction between the ES/LB forms of doped PANI and a concomitant release of dopant anions both in air and in 3 wt% NaCl solution as demonstrated by OCP and EIS results. These therefore lead to the strong passivation and self-healing effect of the composite coated on the carbon steel surface.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2016. Vol. 6, no 23, 19111-19127 p.
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-183688DOI: 10.1039/c6ra00661bISI: 000370710500042Scopus ID: 2-s2.0-84958974224OAI: oai:DiVA.org:kth-183688DiVA: diva2:913126
Note

QC 20160319

Available from: 2016-03-19 Created: 2016-03-18 Last updated: 2017-03-14Bibliographically approved
In thesis
1. Electrochemical Application and AFM Characterization of Nanocomposites: Focus on Interphase Properties
Open this publication in new window or tab >>Electrochemical Application and AFM Characterization of Nanocomposites: Focus on Interphase Properties
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The use of graphene and conductive polyaniline nanomaterials in the field of electrochemistry is increasing due to their excellent conductivity, rapid electron transfer and high specific surface area. However, these properties are strongly dependent on the preparation processes. To accelerate the development of advanced electrochemical sensors for the simultaneous detection of trace amounts of heavy metal ions, two facile and green methods are proposed to improve their performance in this thesis. The first one was dedicated to make graphene-carbon nanotube hybrid nanocomposites. The introduction of carbon nanotubes not only greatly enhances the conductivity of graphene but also suppresses, to some degree, the aggregation between graphene nanosheets. Another method proposed in this thesis work was to synthesize a phytic acid doped polyaniline nanofiber based nanocomposite. The synergistic contribution from polyaniline nanofibers and phytic acid enhances the accumulation efficiency and the charge transfer rate of metal ions during the differential pulse anodic stripping voltammetry analysis. The above-mentioned nanocomposite modified electrodes were all successfully applied to real samples for the simultaneous detection of Cd2+ and Pb2+ with good recovery rates. Meanwhile, corrosion protection is another important branch in the field of electrochemistry. In this direction, an active alkyd-polyaniline composite coating with self-healing functionality was prepared. The polyaniline used in this thesis was doped with p-toluene sulfonic acid, which was employed to increase the conductivity of polyaniline, and 1 wt.% of as-prepared polyaniline nanoparticles were found to offer an effective conductive network for anticorrosion. Finally, the reasons that such low loading levels of nanomaterials can result in significantly reinforced properties in nanocomposites were studied with combined atomic force microscopy (AFM) techniques. The results demonstrated that the interphase for a 40-nm-sized silica particle could extend to 55–70 nm in poly(ethyl methacrylate) (PEMA) and poly(isobutyl methacrylate) (PiBMA) polymer matrix, and the interphase exhibited a gradient distribution in surface nanomechanical properties.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2017. 72 p.
Series
TRITA-CHE-Report, ISSN 1654-1081 ; 2017:13
Keyword
Electrochemical sensor, nanocomposite, graphene, carbon nanotubes, phytic acid, polyaniline, corrosion protection, silica nanoparticles, atomic force microscopy, interphase
National Category
Materials Chemistry
Research subject
Chemistry
Identifiers
urn:nbn:se:kth:diva-203239 (URN)978-91-7729-285-2 (ISBN)
Public defence
2017-03-10, F3, Lindstedtsvägen 26, Stockholm, 10:00 (English)
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Supervisors
Note

QC 20170315

Available from: 2017-03-15 Created: 2017-03-14 Last updated: 2017-03-17Bibliographically approved

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