http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Kang, Sunggu,Cha, Jonghwan,Seo, Kyeongbeom,Kim, Sejun,Cha, Youngsun,Lee, Howon,Park, Jinsung,Choi, Wonjoon Elsevier 2019 INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER - Vol.130 No.-
<P><B>Abstract</B></P> <P>Integrated circuits or miniaturized portable electronics require adaptive thermal control under certain temperatures. Thermal metamaterials (TMs), which artificially manipulate the heat passing through mediums have shown innovative thermal functions at a continuum scale. However, they cannot implement tunable thermal functions at local spots depending on the operating temperatures. Herein, we introduce temperature-responsive TMs enabled by modular design of thermally tunable unit cells. As ambient temperature changes, tunable thermal shifters can dynamically turn on/off their intrinsic functions to guide anisotropic heat transfer through the transition of thermal conductivities from the inner phase change nanocomposites (PCNCs), and their modular design realizes temperature-responsive thermal shields having switchable functions. The layered structures of stainless steel and the PCNC of <I>n</I>-octadecane embedding carbon nanotubes and copper powder are fabricated as tunable thermal shifters. Their 4 × 4 modular structure confirms the feasibility of temperature-responsive TMs, verified by the disappearance and appearance of thermally shielded regimes at low- and high-temperature ranges. The potential use of the developed concept was demonstrated as tunable interfaces between thermal dissipation and insulation for protecting temperature-sensitive components. This work can offer new capabilities for conventional passive TMs, such as local thermal adaptation, active thermal control interface, and thermal disturbance mitigation.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Temperature responsive thermal metamaterials (TMs) comprising of tunable cells were developed. </LI> <LI> Tunable shifters as unit cells turn on/off anisotropic heat transfer as temperature changes. </LI> <LI> Tunable shifters were realized in layered structures of metals and phase change nanocomposites. </LI> <LI> Modular 4-by-4 cells as one TM perform dynamic thermal shielding by temperature changes. </LI> <LI> The potential use was demonstrated as a tunable interface of thermal dissipation-insulation. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>