期刊
ACS NANO
卷 10, 期 8, 页码 7792-7798出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.6b03381
关键词
interfacial thermal conductance; solubility parameter; organic-inorganic interface; miscibility; time domain thermoreflectance
类别
资金
- National Natural Science Foundation of China [51373184, 51336009]
- National Plan for Science & Technology Support, China [2014BAC03B05]
- MoST (Ministry of Science and Technology) [2014CB931803, 2012CB933801]
- Ministry of Science and Technology of the People's Republic of China [2013YQ120355]
- UMN CSE
Interfacial thermal conductance (ITC) receives enormous consideration because of its significance in determining thermal performance of hybrid materials, such as polymer based nanocomposites. In this study, the ITC between sapphire and polystyrene (PS) was systematically investigated by time domain thermoreflectance (TDTR) method. Silane based self-assembled monolayers (SAMs) with varying end groups, -NH2, -Cl, -SH and -H, were introduced into sapphire/PS interface, and their effects on ITC were investigated. The ITC was found to be enhanced up by a factor of 7 through functionalizing the sapphire surface with SAM, which ends with a chloride group (-Cl). The results show that the enhancement of the thermal transport across the SAM-functionalized interface comes from both strong covalent bonding between sapphire and silane-based SAM, and the high compatibility between the SAM and PS. Among the SAMs studied in this work, we found that the ITC almost linearly depends on solubility parameters, which could be the dominant factor influencing on the ITC compared with wettability and adhesion. The SAMs serve as an intermediate layer that bridges the sapphire and PS. Such a feature can be applied to ceramic-polymer immiscible interfaces by functionalizing the ceramic surface with molecules that are miscible with the polymer materials. This research provides guidance on the design of critical-heat transfer materials such as composites and nanofluids for thermal management.
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