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Observation of Anisotropy in Thermal Conductivity of Individual Single-Crystalline Bismuth Nanowires
Roh, Jong Wook,Hippalgaonkar, Kedar,Ham, Jin Hee,Chen, Renkun,Li, Ming Zhi,Ercius, Peter,Majumdar, Arun,Kim, Woochul,Lee, Wooyoung American Chemical Society 2011 ACS NANO Vol.5 No.5
<P>The thermal conductivity of individual single-crystalline Bi nanowires grown by the on-film formation of nanowires (ON–OFF) has been investigated. We observed that the thermal conductivity of single-crystalline Bi nanowires is highly anisotropic. Thermal conductivity of nanowires (diameter ∼100 nm) in the off-axis [1̅02] and [110] directions exhibits a difference of ∼7.0 W/m·K. The thermal conductivity in both growth directions is diameter-dependent, which indicates that thermal transport through the individual Bi nanowires is limited by boundary scattering of both electrons and phonons. This huge anisotropy in thermal conductivities of Bi nanowires suggests the importance of direction-dependent characterization of charge, thermal transport, and thermoelectric properties of Bi nanowires.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2011/ancac3.2011.5.issue-5/nn200474d/production/images/medium/nn-2011-00474d_0006.gif'></P>
Highly sensitive spin-valve devices for chip-cytometers
Roh, Jong Wook,Son, Oh-Taek,Lee, Young Tack,Lee, Kyoung-il,Jung, Hyo-Il,Lee, Wooyoung WILEY-VCH Verlag 2009 Physica status solidi. PSS. A, Applications and ma Vol.206 No.7
<P>The highly sensitive spin-valve devices integrated with a microfluidic channel have been studied for cell counting in a chip-cytometer. The presence or absence of a single magnetic bead was successfully detected by direct measurement of fringe fields emanating from magnetic beads using spin-valve devices. The real-time detection was also successfully confirmed by the direct measurement of magnetic fields generated from the magnetic beads passing an active sensing area of a spin-valve device integrated with a microfluidic channel. Our results show the possibility of implementing a chip-cytometer for biological applications using the highly sensitive spin-valve devices integrated with a microfluidic device. (© 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)</P>
Roh, Jong Wook,Ham, Jinhee,Kim, Jeongmin,Moon, Hongjae,Kim, Hyun Sik,Lee, Wooyoung Elsevier 2017 ACTA MATERIALIA Vol.136 No.-
<P>Al2O3 nanoparticles-embedded single-crystalline Bi nanowires were successfully synthesized without using any templates via the spontaneous growth of Bi thin films covered with Al2O3 nanoparticles. It is experimentally confirmed that Al2O3 nanoparticles were embedded into the single-crystalline Bi nano wires by using the high-resolution transmission electron microscopy and energy dispersive X-ray spectrometry. The temperature-dependent thermal conductivities of individual Al2O3 nanoparticles-embedded single-crystalline Bi nanowires were measured directly using suspended micro-devices. The thermal conductivities of the Al2O3 nanoparticles-embedded Bi nanowires were found to be extremely low compared with those of pure Bi nanowires of similar diameters. Moreover, the thermal conductivity of the Al2O3 nanoparticles-embedded Bi nanowires was not size-dependent, i.e., it did not vary for nanowires with significantly different diameters. This result suggests that the phonon-boundary scattering is not the dominant phonon scattering mechanism in these systems while the phonon-boundary scattering is dominant in the pure single-crystalline nanowires. From the experimental measurements and theoretical calculation, these drastic reduction and unique tendency in the thermal conductivities of Al2O3 nanoparticles-embedded Bi nanowires were explained by the combined effect of the phonon boundary scattering and impurity scattering occurring between the embedded Al2O3 nanoparticles and Bi matrix. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.</P>
노종욱 ( Jong Wook Roh ),장소영 ( So Young Jang ),강주훈 ( Joo Hoon Kang ),이승현 ( Seung Hyun Lee ),노진서 ( Jin Seo Noh ),박정희 ( Jeung Hee Park ),이우영 ( Woo Young Lee ) 대한금속·재료학회 2010 대한금속·재료학회지 Vol.48 No.2
We investigated the thermal conductivity of individual single-crystalline PbTe nanowires grown by chemical vapor transport method. Suspended MEMS was utilized to precisely measure the thermal conductivity of an individual nanowire. The thermal conductivity of a PbTe nanowire with diameter of 292 nm was measured to be 1.8 W/m·K at 300 K, which is about two thirds of that of bulk PbTe. This result indicates that the thermal conduction through a PbTe nanowire is effectively suppressed by the enhanced phonon boundary scattering. As the diameter of a PbTe nanowire decreases, the corresponding thermal conductivity linearly decreases.
MS 마커를 활용한 지역별 오계 유전자원의 다양성 및 유연관계 분석
노희종(Hee-Jong Roh),김관우(Kwan-Woo Kim),이진욱(Jin-Wook Lee),전다연(Da-Yeon Jeon),김승창(Seung-Chang Kim),전익수(Ik-Soo Jeon),고응규(Yeoung-Gyu Ko),이준헌(Jun-Heon Lee),김성희(Sung-Hee Kim),백준종(Jun-Jong Baek),오동엽(Dong-Yep Oh) 한국가금학회 2018 韓國家禽學會誌 Vol.45 No.3
본 연구는 연산오계(천연기념물 제265호)와 이를 기원으로 하는 5개 지역별 오계 집단의 유전적 특성 및 차별성을 분석하기 위해 25개의 초위성체(MS) 마커를 이용하여 총 9개 집단 243수를 대상으로 유전자형을 분석하였다. 마커별 다형성 분석 결과, 총 153개의 대립유전자가 확인되었으며, Hexp와 PIC의 경우 MCW0145에서 각각 0.640, 0.570으로 가장 높았고, Hobs는 MCW0252에서 0.607로 가장 높은 값을 나타내었다. 반면, LEI0166에서 Hexp, Hobs, PIC가 각각 0.248, 0.204, 0.202로 가장 낮았다. 집단간 유전거리 분석 결과로는 9개 집단중 YSO 집단과 SUO 집단이 가장 가까운(0.073) 반면, LG 집단과 CBO 집단 사이에서 가장 먼(0.937) 것으로 확인되었다. 집단의 실제 구조를 확인하기 위한 집단별 균일도를 분석한 결과, 공시된 9개의 집단은 3개의 집단으로 구분했을 때 최적의 K값(7.96)을 얻을 수 있었으며, 5개의 오계 집단(YSO, ARO, CBO, CNO, SUO) 및 LG 집단과 CN․RIR 집단은 각각 1, 2, 3번 군집에 분포하고 있는 것으로 나타났다. 한편, GBO 집단의 경우 1번과 3번 클러스터에 걸쳐서 분포하고 있는 것으로 보아 사육과정에서 타집단과의 교잡이 일어났을 것으로 추정된다. 이러한 결과를 통해 추후 오계 유전자원에 대한 국가 수준의 유전적 특성평가 및 관리의 기초 자료로 유용하게 활용될 것으로 기대된다. The aim of this study was to evaluate the genetic diversity and relationships of Ogye populations in Korea. A total of 243 genomic DNA samples from 6 Ogye population (Yeonsan Ogye; YSO, Animal Genetic Resources Research Center Ogye; ARO, Chungbuk Ogye; CBO, Chungnam Ogye; CNO, Gyeongbuk Ogye; GBO, Seoul National University Ogye; SUO) and 3 introduced chicken breeds (Rhode Island Red; RIR, White Leghorn; LG, Cornish; CN) were used. Sizes of 25 microsatellite markers were decided using GeneMapper Software(v 5.0) after analyzing ABI 3130XL. A total of 153 alleles were observed and the range was 2 to 10 per each locus. The mean of expected and observed heterozygosity and PIC (Polymorphism Information Content) value was 0.53, 0.50, 0.46 respectively. The lowest genetic distance (0.073) was observed between YSO and SUO, and the highest distance (0.937) between the RIR and CBO. The results of clustering analysis suggested 3 clusters (ΔK=7.96). Excluding GBO population, 5 Ogye populations (YSO, ARO, CBO, CNO, SUO) were grouped in same cluster with high genetic uniformity (0.990, 0.979, 0.989, 0.994, 0.985 respectively). But GBO population was grouped in cluster 1 with low genetic uniformity (0.340). The results of this study can be use to basic data for the genetic evaluation and management of Ogye populations in Korea.