Corrosion and Surface Technology Research Group       

Materials and Surface Engineering

Department of Mechanical Engineering

Technical University of Denmark     

AMAS - Anti-microbial aluminium surfaces

 

 

AMAS was a project funded by the Danish National Advanced Technology foundation. Project partners are: PAJ System Teknik A/S (Co-ordinator), Alucluster, Danish Technological Institute (DTI), Institute of Product Development (IPU), DTU-MEK, and DTI-Bio.

 

Light weight aluminium alloy surfaces with “Anti-microbial properties” have high demand for various technological applications in health care, architecture, measuring system and equipments etc. Self-cleaning surfaces on aluminium are also very much useful for other applications such as transportation and building. This project focus on developing “anti-microbial surfaces” on aluminium alloys using the plasma technique involving the use of photocatalytic TiO2 based coatings together with nano-structuring.

 

Sumarry of research work presently under focus at DTU:

 

  • Photoelectrochemical characterisation of TiO2 coatings on aluminium and stainless steel by plasma coating.
  • Effect of substrate surface morphology on TiO2 coating morphology and photocatalytic effect.
  • Photocatalytic acitivty of TiO2 coatings on aluminium by methylene blue decompositon.  
  • Effect of TiO2 coating thickness on photocatalytic acitivity.  
  • SEM/FIB/TEM characterization of TiO2 coatings.  
  • Analysis of TiO2 coatings using GDOES and XRD.

 

 

  • Photocatalytic effect is found to be a function of optical and electrical properties of the substrate material.
  • Substrate surface morphology cause variation in photocatalytic activity probably due to variation in optical properties of the substrate.
  • Morphology of the TiO2 coating was independant of the nature of substrate.
  • OCP and potentiodynamic polarization measurements are good for characterizing photocatalytic activity.
  • Photocatalytic activity is a function of the surface morphology of the coating ie. cell size, which slightly varied with thinkness of the coating.

 

 A schematic showing the reason for self-cleaning effect of TiO2:

 

 

 

For more information contact: Rajan Ambat, ram@mek.dtu.dk

 

 

 

SEM micrograph showing the nanoscale surface morphology of TiO2 coatings.

 

 

Photo-electrochemical cell

 

 

 

 

Building 425, Section of Materials and Surface Engineering, Department of Mechanical Engineering, Technical University of Denmark, DK 2800 Lyngby, Denmark