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James Chapman & Prof. Fiona Regan Questor – Dublin City University

Novel Antifouling Strategies based on Materials Doped with Nanoparticles for use in Environmental M onitoring. James Chapman & Prof. Fiona Regan Questor – Dublin City University. Project Summary. Investigate initial microorganism attachment

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James Chapman & Prof. Fiona Regan Questor – Dublin City University

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  1. Novel Antifouling Strategies based on Materials Doped with Nanoparticles for use in Environmental Monitoring James Chapman & Prof. Fiona Regan Questor – Dublin City University

  2. Project Summary Investigate initial microorganism attachment Probe microbial interaction and substrate influences Applications Improve health, efficiency and performance

  3. Objectives Create a platform material suitable for preventing biofouling Create a platform suitable for preventing bio-corrosion Develop biocidal agents

  4. Industrial Benefits • Marine/Fresh water systems • Water treatment • Air treatment • Medical exploitation • Corrosion prevention • Antifouling Paint costs €65 per L • 3000 L to paint a typical oil tanker • €195K total • PVC costs €140 per Kg • For 10 % w/v • €14 per L • €42K per Kg • Saving €153K

  5. Exploitation • Antifouling Application • Biocorrosion • Biofouling • Coatings • Membranes • Filters

  6. Overview • What is Biofouling? • Remediation through time • Project Work: -Plasticized PVC -Metal Nanoparticles -Membranes • Future Work • Conclusions

  7. What is Biofouling • Woods Hole Oceanographic Institute 1952

  8. The Process

  9. Fouling

  10. Objective Direction 1625 – 1st coating Patent by William Beale 2003 – IMO ban On TBT paint application 2008 – IMO ban On TBT based paints Novel Methods & alternatives 1600 2000BC 300BC 1700 1800 1900 2000 2008 Copper sheathing on wooden ships, and heavy metal based coatings – copper coatings with booster biocides Arsenic Compounds & Tar TBT 1976 Patent Foul release coatings 1977 patent Novel Methods & Alternatives

  11. Work Carried Out • PVC and Solgels • Plasticizers • Metal Nanoparticles • Gallium exploitation • Antifouling Membranes

  12. Laboratory Tests Natural Light Pumps and Aerator pH &DO • Biofouling Assays: • Slime • Biomass • Hydrophobicity Tank 3 Tank 1 Tank 2

  13. Hydrophobicity, Slime and Biomass Analysis Plasticized PVC

  14. Phthalic Acid Esters DMP DEP BOP DEHP

  15. Biomass

  16. Slime

  17. Azelates DMAz DIHAz DEHAz DINAz DIDAz

  18. Biomass

  19. Slime

  20. Chloroparaffins Cl40 Cl50 Cl60 Cl70

  21. Biomass

  22. Slime

  23. Dibenzoates DEGDB DPGDB PEGDB

  24. Biomass

  25. Slime

  26. Adipates DIBd DEHAd DINAd DCAd DnHnHAd DTDAd

  27. Biomass

  28. Slime

  29. DTDAd DIDAz PEGDB DEHP Cl70

  30. Contact Angle

  31. Summary • Some plasticizers offer greater resistance to biofouling • Molecular Structure • Transparent • Everyday material • Cost

  32. Hydrophobicity, Slime and Biomass Analysis Period Four Metal Nanoparticles

  33. Contact Angle Undoped blank Fe-doped

  34. Biomass

  35. Slime

  36. Gallium and Germanium Germanium MNPS Gallium MNPS

  37. Summary • Ga and Ge show good response • MNPs are dopable • Transparent • Effective biocides

  38. Approach and Initial Results Antifouling Membranes

  39. In Situ Synthesis In-situ synthesis Ga0 Cellulose acetate GaNO3 Reducing Agent H2O

  40. Membranes

  41. NPs in Nylon

  42. Flow rates

  43. Conclusions • Ag MNPs synthesised… • In-situ with membranes • Potential in water and air systems • Require fouling and bacterial testing

  44. Thank You And any questions???

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