超晶格和層狀結(jié)構(gòu)傳熱特性的連續(xù)模型及其在能源材料設(shè)計(jì)中的應(yīng)用
發(fā)布時(shí)間：2018-11-06 08:49
【摘要】：層狀材料和超晶格結(jié)構(gòu)為提高熱電材料和隔熱涂層提供了新的設(shè)計(jì)思路,并成為最近的研究熱點(diǎn).應(yīng)用連續(xù)波動方程和線性阻尼理論,本文研究了此類材料中的聲子輸運(yùn)特性.給出了在整個(gè)相空間里的界面調(diào)制和聲子局域化效應(yīng),得出了超晶格材料熱導(dǎo)率的上極限和下極限;同時(shí),分析表明界面銳化加強(qiáng)了聲子帶隙,使得部分模態(tài)的聲子局域化加強(qiáng).最后,通過對石墨烯/氮化硼超晶格(G/hBN)和硅/鍺超晶格的分子模擬(Si/Ge),驗(yàn)證了該理論模型.該方法適用于所有的層狀材料和超晶格結(jié)構(gòu),對此類新能源材料的設(shè)計(jì)提供了普適的設(shè)計(jì)思路.
[Abstract]:Layered materials and superlattice structures provide a new design idea for improving thermoelectric materials and thermal insulation coatings, and have become a hot research topic recently. Using the continuous wave equation and the linear damping theory, the phonon transport characteristics in this kind of materials are studied in this paper. The interface modulation and phonon localization effects in the whole phase space are given, and the upper and lower limits of thermal conductivity of superlattice materials are obtained. At the same time, the analysis shows that the interface sharpening strengthens the phonon band gap, which strengthens the local phonon localization of some modes. Finally, the theoretical model is verified by molecular simulation of graphene / boron nitride superlattice (G/hBN) and silicon / germanium superlattice (Si/Ge). This method is suitable for all layered materials and superlattice structures and provides a general design idea for the design of such new energy materials.
【作者單位】： 耶魯大學(xué)材料科學(xué)與機(jī)械工程系;紐約城市大學(xué)物理系 列維奇本杰明研究所;
【基金】：國家自然科學(xué)基金(批準(zhǔn)號:DMR-0934206)資助的課題~~
【分類號】：TB34
本文編號：2313802
[Abstract]:Layered materials and superlattice structures provide a new design idea for improving thermoelectric materials and thermal insulation coatings, and have become a hot research topic recently. Using the continuous wave equation and the linear damping theory, the phonon transport characteristics in this kind of materials are studied in this paper. The interface modulation and phonon localization effects in the whole phase space are given, and the upper and lower limits of thermal conductivity of superlattice materials are obtained. At the same time, the analysis shows that the interface sharpening strengthens the phonon band gap, which strengthens the local phonon localization of some modes. Finally, the theoretical model is verified by molecular simulation of graphene / boron nitride superlattice (G/hBN) and silicon / germanium superlattice (Si/Ge). This method is suitable for all layered materials and superlattice structures and provides a general design idea for the design of such new energy materials.
【作者單位】： 耶魯大學(xué)材料科學(xué)與機(jī)械工程系;紐約城市大學(xué)物理系 列維奇本杰明研究所;
【基金】：國家自然科學(xué)基金(批準(zhǔn)號:DMR-0934206)資助的課題~~
【分類號】：TB34
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