| 高分子 Vol.63 No.11 |
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特集
热电材料的进化 |
| 展望 |
| 利用理论计算模拟的热电材料研究展望 | 浅井美博 |
| <Abstract> 通过精密的理论计算可以详细的推算发热,传热,热散逸,热能转换等与热相关的问题. 纳米电子领域中与热相关问题的应用在扩散,热电材料等方面的应用也在扩大. 本文概述了利用理论计算模拟的热电材料研究的现状及今后的展望. Keywords: Thermoelectric Figure of Merit / First Principle Non-Equilibrium Green Function (NEGF) Method |
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| 有机高分子及复合热电材料的开发 | 户岛直树 |
| <Abstract> 有机热电材料可以把热直接转换成电能. 近年来, 通过导电率和塞贝克系数的改善,导电高分子的性能得到了飞速的提高. 进而,我们了解到通过与无机纳米材料的复合也对性能提高很有效果. 因其具有环保,轻量,可弯曲并且可以通过印刷技术可简单地制备大面积的设备, 这种技术在低级废热回收,自然热回收等领域将有广阔的应用前景. Keywords: Organic Thermoelectric Materials / Conducting Polymers / PEDOT / Hybrid Materials / CNT / Thermoelectric Figure-of-Merit / Electrical Conductivity / Thermal Management |
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| 纳米结构热电材料的开发动向 | 太田裕道 |
| <Abstract> 纳米结构的控制是热电材料高性能化的关键. 1993年MIT的Dresselhaus等人理论预测了纳米结构控制的有效性以来,通过纳米结构控制的实验有人实现了高ZT值(>2). 本文介绍了通过纳米结构控制利用量子尺寸效应的热电能增强的研究及通过微观结构控制的最新低热传导的研究动向. Keywords: Nano-Structure Control / Quantum Confinment Effect / Superlattices / Two-Dimensional Electron Gas (2DEG) / Phonon-Glass Electron-Crystal / Lattice Thermal Conductivity |
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| 话题 |
| 碳纳米管的分离提纯与高效热电材料中的应用 | 片浦弘道 |
| <Abstract> Because 50% of used energy is wasted as heat in Japan, utilizing waste heat could greatly contribute preventing global warming and energy saving. Thin film, flexible, and high performance at low temperature thermoelectric devices are desirable for that purpose. Very recently, Maniwa et al. revealed that semiconducting SWCNT separated from pristine mixture has very large Seebeck coefficient at room temperature, while metallic SWCNT shows low value. This surprising difference can be explained by well- known Mott’s equation. We have demonstrated a thermocouple device constructed from junctions of metallic and semiconducting SWCNTs. Because SWCNT is robust, flexible, chemically inactive, and highly conductive, SWCNT can be a candidate material for high efficiency thin film thermoelectric devices. Low cost and large scale metal / semiconductor separation method of SWCNT was developed in NEDO project. Supply of low price semiconducting SWCNT could be possible in near future. Keywords: Thermoelectric Device / Carbon Nanotube / Separation / Seebeck Coefficient |
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| 利用高分子纳米结构为模板的高效可弯曲Bi2Te3类热电材料的制备研究 | 宫崎康次 |
| <Abstract> We made porous thermoelectric thin films by using a block copolymer as the template. The nano-porous structure was made over a large area by using a phase separation of a block copolymer (PMMA-b-PMAPOSS). The Bismuth telluride was deposited on a porous polymer film. The thermal conductivities of the porous thermoelectric thin films were lower than that of bulk value due to long phonon mean free path, and the non-dimensional figure of merit was enhanced. A prototype thermoelectric module consisting of 20 pairs of p- and n-type strips was fabricated on the porous polyimide substrate. This module produced an output power of 0.1 mW and the output power was 1.5 times greater than that of a module based on flat Bismuth telluride thin films. Keywords: Thermoelectric / ZT Enhancement / Block Copolymer / Porous / Thermal Conductivity / Phonon |
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| 为回收能源为目标的可弯曲有机热电材料的研究 | 青合利明 |
| <Abstract> By using a photo acid generator (PAG), photo-induced doping to conductive polymers was investigated. The homogeneous film comprised of conductive polymers and PAGs, such as sulfonium salts, could be prepared without aggregation on coating and gave good conductivity after UV irradiation of the film. With the increase of PAG content and UV dose, the conductivity of the film showed higher values. The photo doping method was also effective for CNT / conductive polymer composites as another organic thermoelectric materials, which produced much higher conductivity and values of more than ZT=0.3. Utilizing the CNT composite materials, a flexible organic thermoelectric module was prepared through mask printing process and showed the possibility for an energy harvesting device. Keywords: Photo Doping / Photo Acid Generator / Organic Thermoelectric / Conductive Polymer / Carbon Nanotube Composite / Flexible Thermoelectric Module |
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| 利用生物纳米结合制备的碳纳米管热电复合材料中的热流及电流的独立控制 | 中村雅一 |
| <Abstract> Carbon nanotubes (CNTs) are an attractive material for flexible thermoelectric devices because of their mechanical strength and high electrical conductivity. However, their thermoelectric performance is restricted by the large thermal conductivity. In this work, a novel method to improve performance by inserting bio-based molecules at CNT/CNT junctions is proposed. Thermal conductivity is dramatically suppressed, but electrical conductivity increases by the addition of cage-shaped proteins with semiconducting cores. The Seebeck coefficient can be increased by the selection of core material. By the improvements in all of the three important parameters above, the thermoelectric figure of merit (ZT) increases over 1000-fold. Keywords: Carbon Nanotube / Cage-Shaped Protein / Bio-Nano Junction / Thermoelectricity |
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| 高分子科学与我: 个人独白 |
| 为人民为社会的研究工作为目标 | 梶原Yuri |
| <Abstract> In my college days, I learned not only how to promote my research but also aquired a wide range of knowledge in life. I finally found my enthusiasm to do excellent research for the benefit of people and society. Now as a company reseacher, I aspire that the resin I develop should bring new values to the world. |
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| 高分子科学最新进展 |
| 高分子晶化与计算机模拟 | 山本 隆 |
| <Abstract> Computer modeling is acquiring ever increasing significance in the science and technology of polymers. In this article, we review recent advances in computer simulation of polymer crystallization. We here deal with several topics of great relevance, the basic elementary process of polymer crystallization, the characteristic crystallization behavior of polymers having specific molecular structures, the very fast crystallization during deformation and flow, and the crystallization in confined spaces and interfaces with other materials. We here emphasize the great potential of the computer modeling, and the challenges for the future. Keywords: Computer Modeling / Polymer Crystallization / Primary Nucleation / Crystal Growth / Helical Polymers / Comb-Like Polymers / Multi-Scale Modeling |
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