By Chauhan B.P.S. (ed.)
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71 Chemical methods such as the reduction of metal salts is the most convenient way to control the size of the particles. Today, the key goal in the metal colloid area is the development of reproducible nanoparticle (or modern nanocluster) syntheses in opposition to traditional colloids. 72 The reduction of metal salts in solution is the most widely used method to generate colloidal suspensions of metals. In fact, this method is generally very simple to put into operation. 73–80 Surfactants are generally used as stabilizers of aqueous colloidal suspensions of metal nanoparticles.
Carbon, metal oxides, and zeolites) or stabilized by capping with ligands ranging from small organic molecules to large polymers, which also facilitates catalyst recycling. Sometimes nanoparticles are prepared in various micellar media, which may be cationic, anionic, or neutral. However, supported metal nanoparticles highly dispersed in a host material are mainly desired for practical applications. 31–34 However, the synthesis of metal nanoparticles well dispersed in porous AAO films has been well explored recently.
For the recovery of the metallic nanoparticles from the resin beads, the resin-bound gold NPs were transferred to a beaker and 30 mL of aqueous CPC (50 mmol/dm3) was added in portions of 5 mL at the respective stages. The solution above the resin became pink instantaneously and showed an absorption maximum at 533 nm, indicating the regeneration of gold NPs. Finally, free resin beads were set free, ready for another exchange process. So, from this experiment, versatility of the resin was also confirmed: resins are not only used as a growth controlling agent or stabilizers and can act as such agents so that we can successfully change the surface charge of the metal nanoparticle.
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