Thermal Transport across Surfactant Layers on Gold Nanorods in Aqueous Solution

Xuewang Wu, Yuxiang Ni, Jie Zhu, Nathan D. Burrows, Catherine J. Murphy, Traian Dumitrica, Xiaojia Wang

Research output: Contribution to journalArticle

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 languageEnglish (US)
Pages (from-to)10581-10589
Number of pages9
JournalACS Applied Materials and Interfaces
Volume8
Issue number16
DOIs
StatePublished - Apr 27 2016

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Keywords

  • gold nanorods
  • interfacial thermal conductance
  • molecular dynamics simulation
  • thermal transport
  • transient absorption

ASJC Scopus subject areas

  • Materials Science(all)

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