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탄소 나노 튜브-팁 제작을 위한 다자유도 나노 정렬 시스템 개발
강경수(Gyungsoo Kang),이준석(Junsok Lee),최재성(Jaiseong Choi),곽윤근(Yoon Keun Kwak),김수현(Soohyun Kim) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
AFM tip has been used for surface profiling with a fine resolution, but there is a barrier to improve its performance because of the low aspect ratio. Many researchers have solved this problem with attaching carbon nanotube (CNT) to Si-tip. In this paper, we proposed the aligner system that composed of dual type stage system, and these stages could attach a carbon nanotube to tungsten-tip in vacuum condition. We used tungsten tip instead of Si-tip because of its conductivity. The aligner system proposed in this paper has 10 degree-of-freedom that 3 in the first stage and 7 in the second stage. With picomotors and piezotube, the first stage has the resolution about several tens of ㎚ and the second stage has a resolution about a ㎚. We experimented on characterization of Nano Aligner System and operated picomotors in SEM environment.
인공근육의 일종인 실린더형 유전체 엘라스토머 액츄에이터에 관한 연구
강경수(Gyungsoo Kang),권지훈(Jihoon Kwon),이종현(Jonghyun Lee),김경수(Kyungsoo Kim),김수현(Soohyun Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
Muscle has the most efficient actuation mechanism for known material. This research is for actuator with behavior of natural muscle concerning for characteristics like small size, enough force and linear movement. One of calling as artificial rubber muscle, DEA(Dielectric elastomer actuator) has overwhelming strains characteristics, efficiency and speed properties than natural muscle. Cylindrical roll type dielectric elastomer actuator is consisted of elastomer with electrode wrapped around to spring or another stiffener. Elastomer's spring constant and electrical force also increase as proportional to numbers of layers. We substitute spring constant to elongation-rate relation formula. And we concluded that 3~5 layers can produce enough strains of actuator. More layers can produce large forces and strains, but as numbers of layers increase, strain has become to saturated. Finally we graphed elongation rate vs numbers of layers and voltages using Matlab.
이준석(Lee Junsok),최재성(Choi Jaiseong),강경수(Kang Gyungsoo),곽윤근(Kwak Yoonkeun),김수현(Kim Soohyun) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.11
In this paper, we propose a method to estimate the actuating voltage of the nanotweezer made by manual assembly using carbon nanotube. The nanotweezer is composed of two CNT arms that are made by the multiwalled carbon nanotube and tungsten tip. Since the each CNT arm has the macro actuator, the nanotweezer can manipulate a large particle and it is possible to close and open the CNT arm repeatedly. The closing voltage, i.e., actuating voltage is calculated using the capacitance between the carbon nanotubes in CNT arm. We demonstrate the actuation of the nanotweezer using the voltage calculated with the electrostatic force.
단일 CNT 팁에서 탄소나노튜브의 에칭부피에 관한 연구
이준석(Lee Junsok),최재성(Choi Jaiseong),강경수(Kang Gyungsoo),곽윤근(Kwak Yoonkeun),김수현(Kim Soohyun) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
Because of the various length condition of carbon nanotube, it is very confined the application area of the single CNT tip. In this paper, it was proposed the cutting technique of single CNT tip and the relationship between the etched volume and the amount of the applied charge. It is possible to control the length of single CNT tip arbitrary using this technique. The etched volume and length in the single CNT tip can be predicted with the amount of the applied charge. It is very easy to make a single CNT tip with proper length using this technique and to make nanotweezer that was composed two single CNT tips.