Surface modification of nanomaterials


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Surface modifications of nanomaterials help to tune their properties to suit different applications in the field of nanotechnology

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Surface modification of nanomaterials

  1. 1. Ümit TAYFUNPolymer Science & Technology
  2. 2. There are limitations in the applications ofnanomaterials because of their restrictedbehaviour in different solventsSurface modifications of nanomaterials help totune their properties to suit different applicationsin the field of nanotechnology, because surfaceproperties determine the interaction among thecomponents, as well as the solubility andagglomeration behaviour in different solvents
  3. 3. Chemical modification of nanoparticle surfaceMain aim is to make nanomaterial;To gain Hydrophilic, hydrophobic, conductive or anticorrosive properties
  4. 4. Development of multi-functional hybrid coating for scratch andcorrosion resistance: inorganic (nanoparticle) and organic component(active site)• Functionalized nanoparticles can be applied in different areas:engineering, medical, biological, etc.Its necessary optimize the active sites on the nanoparticle surface(hydrophilic, hydrophobic, conductive etc)
  5. 5. • NMR (Nuclear Magnetic Resonance) spectroscopy 1H and 13C;• FTIR (Fourier Transform Infrared in the transmission mode at400 – 4000 cm-1 – degree of modification of the nanoparticles;• RAMAN SPECTROSCOPY• TEM (Transmission Electron Microscopy) images – effect ofmodification of nanoparticles on their dispersion properties;• EIS (Electrochemical Impedance Spectroscopy) – estimate thecorrosion protection performance of the prepared coatings
  6. 6. FTIR VIBRATION SURFACE TRANSMISSION ELECTRON CHARACTERIZATION MICROSCOPY Aggegation size • Relatively dispersed at the scale of 100 – 170 nmA – aminopropyl trimethoxy silane (APS)B – untreated ZrO2 nanoparticles •Some aggregates particles can beC – APS – treated ZrO2 nanoparticles observed (-OH: hydrogen bonding)
  7. 7. Development of nanotechnology-based organic coating to enhanceanticorrosion properties (incorporation of nanoparticles) • The improvement in the properties of the nanocoatings is attributed to their nanoparticles functionalized ; • Nanomaterials mostly used in coating system: SiO2, TiO2, ZnO, Al2O3, Fe2O3, nano-aluminum, nano-titanium
  8. 8. Improvement of UV-Blocking Coatings•Inorganic nanoparticles, as alternative to UV-blockers in coating applications•Nano-ZnO, nano-TiO2, nano-CeO2 : excellent photo- and thermal stability•Example: transparent ZnO/epoxy nanocomposite coating via in situpolymerization. Optical properties of the nanocomposite coating depends onZnO particle size
  9. 9. Development of transparency and wear resistance•The interface between particle and polymer matrix plays an important role as awell integrated filler provides better mechanical reinforcement•When grafted with silanes having a reactive group, particles can be boundcovalently to the polymer matrix via silane surface modification E. Barna et al, Surface Modification of Nanoparticles for Scratch Resistant Clear Coatings, 2007
  10. 10. Development of Super-Hydrophobic coatings•Continuous demand for water-repellent or hydrophobic coatings in industry
  11. 11. Improvement of colloidal stability of nanoparticles •Attractiveness between the grafted polymer and the silica materialIn image (a), the silica particles have similar colloidal shape and size, with near-monodispersed. In image (b), the polymer-grafted silica nanoparticles are further apart.This indicates that thick layers of hydrophilic methacrylate material were formed Perruchot, Cat al., Synthesis of Well-Defined, Polymer-Grafted Silica Particles by Aqueous ATRP. Langmuir 2001
  12. 12. Fullerene and CNT functionalization•For improvement of reactivity and adhesion properties C60 C60(OH)24 Chemically Phospholipid-coated SWCNT Fullerene Modified Fullerene Sayes et al., NanoLet, 2004
  13. 13. C. Zilg, R. Mu¨lhaupt and J. Finter, Macromolecular Chemistry and Physics 200 (1999) 661.B. Wetzel, F. Haupert and M. Qiu Zhang, Composites Science and Technology 63 (2003) 2055.Siegel, R.H.; Hue, E.; Cox, D.; Goronkin, H.; Jelinski, L.; Koch, C.; Mendel, J.; Roco, M.; Shaw, D. R & D Status and Trends inNanoparticles. Nanostructured materials, and nanodevices in the United States. WTEC Proceedings, International TechnologyInstitute, Baltimore, Maryland, 1998; 1–233.Perruchot, C.; Khan, M. A.; Kamitsi, A.; Armes, S. P.; von Werne, T.; Patten, T. E., Synthesis of Well-Defined, Polymer-GraftedSilica Particles by Aqueous ATRP. Langmuir 2001, 17 (15), 4479-4481.E. Barna, D. Rentsch, B. Bommer, A. Vital, Surface Modification of Nanoparticles for Scratch Resistant Clear Coatings, RawMaterials, 2007F. Bauer, H.-J. Glasel, U. Decker, H. Ernst, A. Freyer, E. Hartmann, V. Sauerland and R. Mehnert, Progress in Organic Coatings,47, 2003, 147.N. Nakashima, Y. Tomonari, H. Murakami, “Water-soluble single-walled carbon nanotubes via noncovalent sidewall functionalizationwith a pyrene-carrying ammonium ion”, Chem. Lett. 6, 638-639, 2002Jung Tae Park , Jin Ah Seo, Sung Hoon Ahn, Jong Hak Kim, Sang Wook Kang, Surface modification of silica nanoparticles withhydrophilic polymers, Journal of Industrial and Engineering Chemistry 16 (2010) 517–522Iijima, M., Tsukada, M. and Kamiya, H., Effect of particle size on surface modification of silica nanoparticles by using silane couplingagents and their dispersion stability in methylethylketone, J. Colloid Interface Sci., 307, 2007, pp.418-424