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Fusion materials based on cationic gold nanoparticles with ionic liquids were prepared. The anion-exchange of the surface capping ligand on the gold nanoparticles from a halogen anion to bis(trifluoromethanesulfonyl)amide (Tf2N) in an aqueous solution afforded nanoparticles showing the infinite miscibility with Tf2N-based ionic liquids. The thermal decomposition temperature of gold nanoparticle was elevated by 100 °C after the anion-exchange. The ionic liquid-like structure of the surface capping ligand with Tf2N anion led to a grassy solid material with densely-packed assembly of nanoparticles, in which a portion of nanoparticles formed superlattices. A fusion material of ionic liquid and gold nanoparticle with a gold content as high as 40wt% was obtained by the co-solvent evaporation method using acetone. The stable dispersion of gold nanoparticles in the fusion materials with a high gold content was confirmed by the clear appearance of the plasmon absorption of gold nanoparticles in an optical microscope image as well as in an absorption spectrum. The use of an ionic liquid-based monomer gave a gold nanoparticle-ionic liquid polymer composite, in which the gold nanoparticles showed a high thermal stability.

Heterogeneous distribution of carbon black (CB) was observed in the polymer blends of high density polyethylene (HDPE)/polypropylene(PP).From the observation with an electron microscope it was found that the majority of CB particles distribute in the HDPE phase. The DSC cooling curves for HDPE/PP blends and CB-filled HDPE/PP blends shewed that for the blends having a volume fraction of HDPE under 40%, two crystalline peaks of HDPE and PP were observed, and the positions of the two peaks were changed on addition the CB particles. This change confirmed that the CB particles predominantly distribute in the HDPE phase. Also, temperature dependence of electrical conductivity was measured, and the effect of heterogeneous distribution of CB particles in the property was observed .

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