Research progress on interfacial thermal transport controlled by self⁃assembled monolayers

doi:10.19491/j.issn.1001-9278.2022.04.011

Abstract

Abstract:

This reviewed the research progress in the heat transfer control of the soft?hard interfaces through self?assembled monolayers （SAM） in the microscopic viewpoint. The heat transfer mechanisms of SAM were introduced and its structure?thermal conductance relations were summarized systematically. The influential factors such as coverage density， length， and terminal functional group of the SAM on the interfacial thermal conductance were discussed. In addition， the current research status of SAM in the polymer?based thermal composites was introduced， and its future research directions of in interfacial heat transfer were prospected.

Key words: interfacial heat transfer, self?assembled monolayer, thermal resistance, thermal conductance, polymer?based composite

CLC Number:

TQ320.66

SONG Lijian, ZHANG Youchen, ZUO Xiahua, ZHANG Zhenghe, AN Ying, YANG Weimin, TAN Jing, CHENG Lisheng. Research progress on interfacial thermal transport controlled by self⁃assembled monolayers[J]. China Plastics, 2022, 36(4): 60-69.

Figures/Tables 13

Fig.1. Schematic illustration of SAM grafted on hard materials（a） and temperature file with SAM and without SAM， respectively［（b）~（c）］

Fig.2. Decomposition of heat flux in SAM and n?dodecane solvents（a） and schematic diagram of heat flow in SAM and n?dodecane： the structure of SAM is ordered， the structure of n?dodecane is disordered （b）

Fig.3. Thermal conductance with different SAM coverage

Fig.4. Schematic illustration of heat flux imposing and temperature distribution （a） and thermal conductance with different SAM coverage under different soft materials system （b）

Fig.5. The vibrational density of normal modes of SAM with different chain length （a） and thermal conductance as a function of the number of methylene groups forming the backbone of the SAM （b）

Fig.6. Thermal conductance of SAM as a function of chain length

Fig.7. Vibrational power spectra of gold， PE and SAM with different chain length（a） and thermal conductance of bare gold and SAM functionalized gold surfaces with different chain length （b）

Fig.8. Schematic illustration of mix?chains SAM

Fig.9. Thermal conductance as a function of interface potential with different mix?chains SAM

Fig.10. Schematic illustration of 75 % C4/25 % C12 （top panel） and 25 % C4/75 % C12 （bottom panel）（a） and thermal conductance of mixed chains has a nonmonotonic dependence on the fraction of long chains（b）

Fig.11. Decomposition of thermal conductance into contributions from the L?J interaction （the grayed portion） and electrostatic interactions （the bright portion）

Fig.12. RDFs of four representative groups on SAMs （-CH3 group， -CH2NH2 group， -CH2OH group， and -COOH group） with respect to atoms in pentacene molecules

Fig.13. Research on SAM in polymer?based thermal conductive composites

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