Interfacial phonon scattering

Cai et al. proposed a new route to reduce the interfacial phonon scattering (27). Semicrystalline PU dispersions were used as latex host to accommodate MWNTs following the colloidal physics... 

Hida S, Shiga T, Maruyama S, Elliott JA, Shiomi J (2012) Influence of thermal boundary resistance and interfacial phonon scattering on heat conduction of carbon nanotube/polymer composites. Trans Jpn Soc Mech Eng Part B 78(787) 634-643 Hilmi Y, Seyhana TA, Servet T, Metin T, Wolfgang B, Karl S (2010) Electric field effects on CNTs/vinyl ester suspensions and the resulting electrical and thermal composite properties. Compos Sci Technol 70(14) 2102-2110... 

In addition, the interface disorder can scatter phonons at grain boundaries or interfaces between similar materials [51]. Thus, it may be expected that materials with high interfacial densities should reduce the thermal conductivity of TBCs. For instance, a multilayered W/AI2O3 film could give rise to a thermal conductivity of 0.6 W.m K [51]. For EBPVD coatings, the introduction of interfaces into each column, which are parallel to the ceramic/metal interface, can reduce the thermal conductivity by 37-45% compared to state-of-the art EBPVD TBCs (Fig.8) [9, 52]. 

From a theoretical point of view, the scattering of phonons in mnltiphase systems is determined by the existence of an interfacial thermal barrier from acoustic mismatch. In a simplified model, the transmission of a phonon between two phases is affected by the presence of common vibration frequencies for the two phases. Thus, it... 

In conventional composites, the models of thermal conduction are based on the Fourier heat conduction theory. However, these models are not valid at the nanoscale due to the ballistic phonon transport and interfacial scattering. Chen et al. [31] have reviewed the status and progress of theoretical and experimental studies of thermal transport phenomena in nanostructures. We discuss here some theoretical and numerical efforts toward the prediction of thermal conductivity of nanopartide-polymer nanocomposites. 

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