Synthesis Of Monodispersed Noble Metal Nanoparticles And Catalytic Decomposition Of JP-10

Monodispersed noble metal nanoparticles (NPs) have substantial application inelectronics, photonics, catalysis, biomedicine and sensors because of nanoparticleshave better features than common particles. Through the process of synthesis metalnanoparticles, different shapes of nanoparticles would be prepared if the condition oftime or temperature were controlled. When adding monodispersed metal nanoparticlesinto the fuels, it will form a quasi homogeneous system which would catalyze thedecomposition of fuels. The catalyst not only promotes the decomposition of fuels,but also reduces the challenges hypersonic flying. The objective of this work is toresearch the shape evolution of Au nanoparticles in Brust-Schiffrin (B-S) method,fabricating of monodispersed Pd NPs, Pt NPs and catalytic decomposition of JP-10.Au NPs, Pd NPs, Pt NPs were prepared by the Brust-Schiffrin method, all of thesamples were characterized by various methods. Meanwhile, the decompositionreaction of JP-10catalyzed by Pd NPs, Pt NPs was evaluated. The properties andinfluences of catalyst nanoparticles with different protecting ligands were reported.New insight into the shape evolution and control in Brust-Schiffrin synthesis ofAu nanoparticles is reported. When the capping ligands were changed fromdodecanethiol to oleylamine, triangle nanoparticles were formed through the particles’evolution. To further demonstrate the possibility of shape control in the B-S synthesis,we used the mixture of dodecanethiol and oleylamine (molar ratio of2/1) as theprotecting ligand. Different from current wisdom, Au NPs formed in this processundergo a time-dependent shape evolution first controlled by kinetics and then bythermodynamics. NPs with various thermodynamically unfavored shapes presentduring this evolution. Moreover, such shapes like well-defined triangles andquadrilateral particles can be produced. Finally, the Au NPs all become the shape ofsphere with uniform size.Pd NPs, Pt NPs with octadecylamine, oleylamine as protecting ligands wereprepared by the Brust-Schiffrin method. Through the process, we prepared four kindsof nanoparticles with the moral ratio of ligand/metal from1to4. The size of the NPswould become bigger when the ligands increased.Monodispersed Pd NPs and Pt NPs can easily disperse into JP-10. When Pt NPs were used as the catalyst, the heat sink of decomposition of JP-10changed from2088KJ/g to2852KJ/g, improved36percent. In summary, metal NPs could use toimprove the decomposition of fuels.