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탄소나노튜브 및 마이크로 글래스 버블 기반 열전 복합재
강구혁 ( Gu-hyeok Kang ),성광원 ( Kwang Won Seong ),김명수 ( Myung Soo Kim ),김인국 ( In Guk Kim ),방인철 ( In Cheol Bang ),박형욱 ( Hyung Wook Park ),박영빈 ( Young-bin Park ) 한국복합재료학회 2015 Composites research Vol.28 No.2
본 논문에서는 탄소나노튜브(CNT)와 마이크로 글래스 버블(GB)을 포함한 폴리아마이드 6(PA6) 복합재의 열전 특성을 다뤘다. 복합재에 포함된 GB은 복합재 내에서 큰 공간을 차지하게 되는데, 이때 CNT는 GB가 없는 공간으로 밀려나면서 고밀도로 격리된(segregated) 네트워크를 형성한다. CNT의 분산을 위해, 소니케이션(Sonicatoin)으로 CNT를 분산시킨 PA6, 포름산 용액을 증류수를 이용하여 응고시킨 후 압축성형하여 복합재 판을 제조하였다. 복합재 판의 열전성능을 평가하기 위해서 열전도도, 전기전도도, 제벡계수(Seebeck coefficient) 등을 측정하였고, 최고 0.016의 성능지수를 얻었다. In this paper, carbon nanotubes (CNTs) and micro glass bubbles (GBs) have been incorporated into a polyamide6 (PA6) matrix to impart thermoelectric properties. The spaces created in the matrix by GBs allows the formation of “segregated” CNT network. The tightly bound CNT network, if controlled properly, can serve as a conductive path for electron transport, while prohibiting phonon transport, which would provide an ideal configuration for thermoelectric applications. The CNTs and GBs were dispersed in a nylon-formic acid solution using horn sonication followed by coagulation in deionized water, and nanocomposite panels were fabricated using a hot press. The performance of nanocomposite panels was evaluated from thermal and electrical conductivities and Seebeck coefficient, and a thermoelectric figure of merit as high as 0.016 was achieved.
열에너지 수확용 멀티스케일 및 섬유강화 복합재의 열전 특성 평가
성대한(Dae Han Sung),강구혁(Gu-Hyeok Kang),공경일(Kyungil Kong),김명수(Myungsoo Kim),박형욱(Hyung Wook Park),박영빈(Young-Bin Park) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
In this research, two kinds of multifunctional materials that serve as not only structural but also thermoelectric materials were manufactured, and their applicability was assessed as thermoelectric materials. One is multiscale composite (carbon nanotubes(CNT)/glass fabric(GF)/epoxy) and the other is fiber-reinforced composite (carbon fiber(CF)/epoxy). GF/epoxy composites containing various contents of CNT were prepared by calendering with a threeroll-mill followed by a hand-layup process on a hot plate. Experiments confirmed that the electrical conductivity of multiscale composites increases as CNT concentration increases. In-plane thermal and electrical conductivities of multiscale and fiber-reinforced composites are higher than those in through-thickness direction due to the alignment effect of CNTs and continuity of woven fabric. In most cases, conductivities of fiber-reinforced composites are higher than those of multiscale composites. Calculating the Seebeck coefficients, we concluded that multiscale composites behave as n-type thermoelectric materials and fiber-reinforced composites showed p-type nature. Closed circuit consisting of two different types of materials showed appreciable electric currents in the presence of temperature gradients.