Nanoparticulas.doc
2
Synthesis of the Gold Nanoparticles Our team (Los Salvadores del gato de Shcrödinger) is supported by Instituto de Ciencia Molecular in Valencia`s University, Spain, with the scientist Gonzalo Abellán working there until September, when he will work as Marie Curie Fellow with Prof. Dr. Andreas Hirsch in Erlangen-Nuremberg Institut für Organische Chemie II, who has tauch us how to synthesized gold nanoparticles by a seed growth strategy kinetically controlled with the reduction of ácido tetracloroaurico (HauCl 4 using the method deeloped by the group of Victor Puntes Landmuir, 2011, 27 (17) pp 11098-11105. By this method we obtain aqueous colloidal scatterings of gold nanoparticles of controlled size, monoscattered and quasi- spherical. Experimental procedure: We begin with a sodium citrate scattering in distilled water which its heated up with hard agitation. When the mixture starts boiling, we add the HauCl 4. The resulting particles (ca. 10 nm, ca. 3.10 12 Nps/mL) are coated by citrate ions negative charged, so they remain well suspended in H 2 O. In a second step, we can increase the size of the nanoparticles in a controlled way, avoiding the formation of new growth seeds: Inmediately after synthesising the NPs of Au and in the same flask, the reaction cools down and we inyect the soudium citrate and the HauCl 4 secuenctially. Finally, we obtain the Nps, which size can be moduled repeating this last addition atter up 14 times, getting a wide-range of sizes from 20nm to 180nm. If the water of the disolution is eaporated we can obtain gold nanoparticles dust. Therefor, we can have for the experiment a suspention of nanoparticles both in water or in dust. Annexes: Images
Transcript of Nanoparticulas.doc
Synthesis of the Gold Nanoparticles
Our team (Los Salvadores del gato de Shcrdinger) is supported by Instituto de Ciencia Molecular in Valencia`s University, Spain, with the scientist Gonzalo Abelln working there until September, when he will work as Marie Curie Fellow with Prof. Dr. Andreas Hirsch in Erlangen-Nuremberg Institut fr Organische Chemie II, who has tauch us how to synthesized gold nanoparticles by a seed growth strategy kinetically controlled with the reduction of cido tetracloroaurico (HauCl4
using the method deeloped by the group of Victor Puntes Landmuir, 2011, 27 (17) pp 11098-11105.
By this method we obtain aqueous colloidal scatterings of gold nanoparticles of controlled size, monoscattered and quasi-spherical.Experimental procedure:We begin with a sodium citrate scattering in distilled water which its heated up with hard agitation. When the mixture starts boiling, we add the HauCl4. The resulting particles (ca. 10 nm, ca. 3.1012 Nps/mL) are coated by citrate ions negative charged, so they remain well suspended in H2O.In a second step, we can increase the size of the nanoparticles in a controlled way, avoiding the formation of new growth seeds:
Inmediately after synthesising the NPs of Au and in the same flask, the reaction cools down and we inyect the soudium citrate and the HauCl4 secuenctially. Finally, we obtain the Nps, which size can be moduled repeating this last addition atter up 14 times, getting a wide-range of sizes from 20nm to 180nm. If the water of the disolution is eaporated we can obtain gold nanoparticles dust.Therefor, we can have for the experiment a suspention of nanoparticles both in water or in dust.Annexes: Images
Image of an electronic microscopy showing Au nanoparticles obtained quasi spherical. The scale bar represents 50nm
Image of a histogram showing the size distribution of the Au nanoparticles. The analysis of more than 400NPs yields an aerage size of 16,3 (2.1) nm.gg
Image of an absorptio spectrum UV-vis Au nanoparticles showing the characteristic absorption band of the surface of the plasmon
