Electrophoretic deposition of materials using lithocholic acid as a dispersant

•Electrophoretic deposition (EPD) of materials was performed in ethanol solvent.•Lithocholic acid (LCA) was used as an anionic biosurfactant for EPD.•Diamond and poly(tetrafluoroethylene) (PTFE) were deposited.•LCA was used as a co-dispersant for EPD of diamond-PTFE composites.•PTFE coatings provide...

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Bibliographic Details
Published inMaterials letters Vol. 275; p. 128129
Main Authors Zhao, Q., Liu, X., Zhitomirsky, I.
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier B.V 15.09.2020
Elsevier BV
Subjects
Bile
Corrosion currents
Corrosion potential
Corrosion prevention
Corrosion protection, coating
Diamond
Diamond films
Diffusion barriers
Diffusion coating
Dispersants
Electrophoretic deposition
Equivalent circuits
Ethanol
Lithocholic acid
Materials science
Particle charging
Poly(tetrafluoroethylene)
Polytetrafluoroethylene
Protective coatings
Stainless steels
Steroids
Diamond
Corrosion protection, coating
Lithocholic acid
Poly(tetrafluoroethylene)
Electrophoretic deposition
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Summary:•Electrophoretic deposition (EPD) of materials was performed in ethanol solvent.•Lithocholic acid (LCA) was used as an anionic biosurfactant for EPD.•Diamond and poly(tetrafluoroethylene) (PTFE) were deposited.•LCA was used as a co-dispersant for EPD of diamond-PTFE composites.•PTFE coatings provided corrosion protection of stainless steel. Lithocholic acid (LCA) was used as an anionic biosurfactant for the dispersion and electrophoretic deposition (EPD) of electrically neutral materials, such as poly(tetrafluoroethylene) (PTFE) and diamond from suspensions in ethanol. The steroid structure of LCA facilitated its adsorption on PTFE and diamond, which allowed for particle charging and deposition by anodic EPD. LCA was used as a co-dispersant for the fabrication of composite PTFE-diamond coatings. PTFE coatings provided corrosion protection of stainless steel in 3% NaCl solutions. Potentiodynamic studies revealed increased corrosion potential and decreased corrosion current of coated steel in comparison with uncoated steel. Impedance spectroscopy studies and analysis of the equivalent circuit showed that PTFE coating acted a barrier for electrolyte diffusion. LCA is a promising surfactant for EPD of other hydrophobic electrically neutral materials.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2020.128129