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‘ Nanoparticles and biochemistry’

‘ Nanoparticles and biochemistry’

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‘ Nanoparticles and biochemistry’

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  1. ‘Nanoparticles and biochemistry’ Group II Aleksandra Tkacz UST Lidia Proczek UST Katarzyna Michalów UST Jana Hruba’ STU Eva Kuzielova’ STU Krzysztof Burek UST

  2. Outline • Nanomaterials and quantum dots (QDs) • Biochemistry • Gd2O3:Tb3+@SiOx system • Researches • Summary

  3. Nanoparticles

  4. Quantum Dots (QDs) Nanometre-scale semiconductor crystals

  5. Quantum Dots (QDs) How it works ...

  6. Quantum Dots (QDs) Relationship between crystal size and colour The smaller the size, the shorter the wavelenght

  7. Quantum Dots (QDs) Advantages in comparison with conventional Dyes • QDs emit light at a variety of precise wavelenghts • QDs can be excited by any wavelenght shorter than the one it emits • QDs have wide range of avaible colours • QDs are extremely stable

  8. Quantum Dots (QDs) Ways of obtaining nanoparticles • Sol-gel • Plasma • Mechanochemical • Aerosol processing • High-energy ball milling • Polyol and other chemical • Hydrothermal processing • Other chemical and physical techniques as needed

  9. Quantum Dots (QDs) Applications

  10. Life science Controling the size and phase of semiconductor nanocrystals by biological materials (peptides, etc.) QDs as a markers

  11. Gd2O3:Tb3+@SiOx[1] Double Luminescence for Biological Labeling [1] Chem. Mater. 2005, 17, 1673-1682

  12. Optical properties of Gd2O3:Tb3 Double Luminescence for Biological Labeling • high photostability • narrow emission bands

  13. Gd2O3:Tb3+@SiOx systemThe role of the layer : Double Luminescence for Biological Labeling • allows the dispersion of the particles in aqueous solution without loss of luminescence intensivity • the luminescence of polisiloxane-coated Gd2O3 nanoparticles is more intense than that in the case of the naked core Gd2O3 • in the presence of amino groups, organic dyes and biotargeting groups (nucleic acid, biotin, streptavid) were covalently linked to the polisiloxane network

  14. Research work ‘Preparation and characterization of ZnS:Mn nanoparticles’

  15. Materials

  16. Preparation route I

  17. Preparation route II

  18. Results a) pH=4,82 b) pH=4,91

  19. Results a) pH=4,82 b) pH=4,91

  20. Results a) pH=4,82 b) pH=4,91

  21. Summary • A wide range of future application • QDs have better properties than conventional Dyes • The luminescence of QDs @ SiOx systems is very intense • It’s not difficult to obtain • luminescent nanoparticles

  22. Thank you for your attention

  23. References • C. Louis, R. Bazzi, C.A. Marquette, J-L. Bridot, S.Roux, G. Ledoux, B. Mercier, L. Blum, P. Perriat, O. Tillement Chem. Mater 2005, 17, 1673-1682 • E. Klarreich Nature 2001, 413, 450-452 • N.G. Portney, K. Singh, S. Chaudhary, G. Destito, A.Schneemann, M.Machester, M. Ozkan Langmuir 2005, 21, 2098-2103 • C.E. Flynn, C. Mao, A. Hayhurst, J.L. Williams, G. Georgiu, B. Iverson, A.M. Belcher J.Mater. Chem. 2005, 13, 2414-2421