Publikation: Tailoring the Surface and Solubility Properties of Nanocrystalline Titania by a Nonaqueous In Situ Functionalization Process
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The reaction between titanium tetrachloride and benzyl alcohol in the presence of enediol ligands such as dopamine and 4-tert-butylcatechol provides a simple nonaqueous route to in situ surface functionalization of titania nanoparticles. The as-prepared precipitates are resoluble either in water or in organic solvents, depending on the ligand used. The surface chemistry of the 4-tert-butylcatechol-functionalized particles dissolved in dimethylformamide was analyzed by 1H NMR measurements revealing the presence of adsorbed 4-tert-butylcatechol, in addition to benzyl alcohol and water. Although the reaction temperatures of 70 or 80 °C are relatively low, XRD and HRTEM investigations give evidence that the as-synthesized nanoparticles are highly crystalline. Ultracentrifugation analysis of dopamine-functionalized titania nanoparticles dissolved in water shows a particle size distribution of approximately 3.5−8 nm with the peak maximum at 5.5 nm. Furthermore, the UV−vis detector system of the ultracentrifuge allows the measurement of the absorption spectra dependent on the particle size, showing an unusual red shift with decreasing particle size.
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NIEDERBERGER, Markus, Georg GARNWEITNER, Frank KRUMEICH, Reinhard NESPER, Helmut CÖLFEN, Markus ANTONIETTI, 2004. Tailoring the Surface and Solubility Properties of Nanocrystalline Titania by a Nonaqueous In Situ Functionalization Process. In: Chemistry of Materials. 2004, 16(7), pp. 1202-1208. ISSN 0897-4756. eISSN 1520-5002. Available under: doi: 10.1021/cm031108rBibTex
@article{Niederberger2004-04Tailo-40467, year={2004}, doi={10.1021/cm031108r}, title={Tailoring the Surface and Solubility Properties of Nanocrystalline Titania by a Nonaqueous In Situ Functionalization Process}, number={7}, volume={16}, issn={0897-4756}, journal={Chemistry of Materials}, pages={1202--1208}, author={Niederberger, Markus and Garnweitner, Georg and Krumeich, Frank and Nesper, Reinhard and Cölfen, Helmut and Antonietti, Markus} }
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