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Nonlinear size-dependent melting of the silica-encapsulated silver nanoparticles
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Image of FIG. 1.
FIG. 1.

(a) DSC profile of 15 nm silica-encapsulated Ag NPs. The large endotherm at 353 K is due to the loss of the water/ethanol azeotrope, the one at 1070 K is the melting of the NPs, and the event at 1234 K is the melting of bulk silver. (b) A detailed view of the silver melting region.

Image of FIG. 2.
FIG. 2.

DSC profiles of 26 nm (a) and 42 nm (b) silica-encapsulated Ag NPs in the silver melting region. The endotherms at 1147 K (a) and 1181 K (b) are the melting of the NPs, and the events at 1231 K (a) and 1235 K (b) are the melting of bulk silver.

Image of FIG. 3.
FIG. 3.

Size dependence of the melting temperature (T m) of silica-encapsulated Ag NPs. The □ symbols are the experimental data points. The △ symbols are the calculated data points. The blue solid line is the fit of the calculated data with respect to the particle size (D, nm), which can be simply described by .


Generic image for table
Table I.

Summary of the sizes, measured melting temperatures (T mm), and calculated melting temperature (T mc) with two different correct factors (C) for the Ag NPs with various particles.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Nonlinear size-dependent melting of the silica-encapsulated silver nanoparticles