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

doi:10.1021/acsami.5b12163

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 journal › Article › peer-review

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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)
Pages (from-to)	10581-10589
Number of pages	9
Journal	ACS Applied Materials and Interfaces
Volume	8
Issue number	16
DOIs	https://doi.org/10.1021/acsami.5b12163
State	Published - Apr 27 2016

Bibliographical note

Funding Information:
This work was partially supported by the National Science Foundation (NSF) through the University of Minnesota MRSEC under Award DMR-1420013 (X. Wu. and X. Wang), NSF CMMI-1000415 (Y. Ni and T. Dumitrica), and NSF CHE-1306596 (N. Burrows and C. Murphy).

Publisher Copyright:
© 2016 American Chemical Society.

Keywords

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

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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.",

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Thermal Transport across Surfactant Layers on Gold Nanorods in Aqueous Solution

Abstract

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Keywords

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