By Luis M. Liz-Marzán, Prashant V. Kamat
Prepared nanoassemblies of inorganic nanoparticles and natural molecules are development blocks of nanodevices, whether or not they are designed to accomplish molecular point computing, experience the surroundings or enhance the catalytic houses of a fabric. the main to construction of those hybrid nanostructures lies in realizing the chemistry at a primary point. This ebook serves as a reference ebook for researchers by means of supplying basic realizing of many nanoscopic fabrics.
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The charge of the dissociated head groups is pH dependent, allowing control on the solubility of the nanoparticles. For example, nanoparticles functionalized with amino groups are soluble in acidic solutions, whereas carboxylic units provide solubility in basic solutions. 86 Nanoparticles functionalized with sulfonic acid units are well soluble in a broad pH range. 75 The dissociation of the functionalized metal nanoparticles was studied by measurements of the contact angle at a solid support covered with the nanoparticles,75 Figure 6(A).
229 Such a system is different from molecular host-guest complexes because a single functionalized Au nanoparticle carries many binding sites that accommodate many guest molecules. The diacyldiaminopyridine-host sites have different affinities to the oxidized and reduced states of flavin-guest, and the binding of flavin increases more than 20-fold upon its reduction. This provides a direct electrochemical switch for the control of complex formation at the surface of the functionalized nanoparticles.
195 Double-layer capacitances of individual functionalized metal nanoparticles in electrolyte solutions are small (sub-attoFarad, aF). 1 V increments for single-electron transfers at the electrode/electrolyte interface. 62,152,196 For example, a differential pulse voltammogram obtained for a solution of thiolate-capped Au nanoparticles clearly shows peaks for a multi-step single-electron charging process,62 Figure 20. 26 E. KATZ ET AL. The electrochemical properties of redox unit-functionalized nanoparticles are unusual in comparison with free redox-molecules because they transfer many redoxequivalents under diffbsional control to the electrode/solution interface.