Abstract
Ultrafast transient absorption experiments and molecular dynamics simulations are utilized to investigate the thermal transport between aqueous solutions and cetyltrimethylammonium bromide (CTAB)- or polyethylene glycol (PEG)-functionalized gold nanorods (GNRs). The transient absorption measurement data are interpreted with a multiscale heat diffusion model, which incorporates the interfacial thermal conductances predicted by molecular dynamics. According to our observations, the effective thermal conductance of the GNR/PEG/water system is higher than that of the GNR/CTAB/water system with a surfactant layer of the same length. We attribute the enhancement of thermal transport to the larger thermal conductance at the GNR/PEG interface as compared with that at the GNR/CTAB interface, in addition to the water penetration into the hydrophilic PEG layer. Our results highlight the role of the GNR/polymer thermal interfaces in designing biological and composite-based heat transfer applications of GNRs, and the importance of multiscale analysis in interpreting transient absorption data in systems consisting of low interfacial thermal conductances.
Original language | English (US) |
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Pages (from-to) | 10581-10589 |
Number of pages | 9 |
Journal | ACS Applied Materials and Interfaces |
Volume | 8 |
Issue number | 16 |
DOIs | |
State | Published - Apr 27 2016 |
Keywords
- gold nanorods
- interfacial thermal conductance
- molecular dynamics simulation
- thermal transport
- transient absorption
ASJC Scopus subject areas
- General Materials Science