• Proceedings of the KIEE Conference
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• 2007.10a
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• pp.251-252
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• 2007

Nano manipulator is used to manufacture Carbon NanoTube(CNT) tips. Using nano manipulator operator attaches a CNT at the end of Atomic Force Microscopy(AFM) tip, which requires a master mechanic and long manufacture time. Nano manipulator is installed inside Scanning Electron Microscopy (SEM) chamber to observe the operation. This paper presents a control of horizontal axis of nano manipulator via processing SEM image. Edges of AFM tip and CNT are first detected, the position information so obtained is fed to control horizontal axis of nano manipulator. To be specific, visual servoing loop was realized to control the axis more precisely.

• Korean Chemical Engineering Research
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• v.55 no.6
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• pp.771-777
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• 2017

Adsorption characteristics of Eosin Y dye by carbon nano tubes (CNTs) were examined through batch experiments. CNTs used in the study had specific surface area of $106.9m^2/g$, porosity volume of $1.806cm^3/g$, and porosity diameter of $163.2{\AA}$, respectively. Adsorption experiments were carried out as function of contact time, initial solution pH (2~10), dye concentration (100, 150 and 200 mg/L), adsorbent dose (0.05~1.0 g) and temperature (293, 313 and 333 K). The adsorption was favoured at lower pHs and temperatures. Adsorption data were well described by the Langmuir model. The adsorption process followed the pseudo-second order kinetic model. The adsorption capacity decreased with increase in temperature. The results of the intraparticle diffusion model suggested that film diffusion and particle diffusion were simultaneously occured during the adsorption process. Thermodynamic studies suggested the spontaneous and endothermic nature of adsorption of Eosin Y dye onto CNTs.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2006.04a
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• pp.106-106
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• 2006

• Smart Structures and Systems
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• v.22 no.1
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• pp.105-120
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• 2018

In this paper, the nonlinear free and forced vibration responses of sandwich nano-beams with three various functionally graded (FG) patterns of reinforced carbon nanotubes (CNTs) face-sheets are investigated. The sandwich nano-beam is resting on nonlinear Visco-elastic foundation and is subjected to thermal and electrical loads. The nonlinear governing equations of motion are derived for an Euler-Bernoulli beam based on Hamilton principle and von Karman nonlinear relation. To analyze nonlinear vibration, Galerkin's decomposition technique is employed to convert the governing partial differential equation (PDE) to a nonlinear ordinary differential equation (ODE). Furthermore, the Multiple Times Scale (MTS) method is employed to find approximate solution for the nonlinear time, frequency and forced responses of the sandwich nano-beam. Comparison between results of this paper and previous published paper shows that our numerical results are in good agreement with literature. In addition, the nonlinear frequency, force response and nonlinear damping time response is carefully studied. The influences of important parameters such as nonlocal parameter, volume fraction of the CNTs, different patterns of CNTs, length scale parameter, Visco-Pasternak foundation parameter, applied voltage, longitudinal magnetic field and temperature change are investigated on the various responses. One can conclude that frequency of FG-AV pattern is greater than other used patterns.

• Composites Research
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• v.29 no.6
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• pp.353-357
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• 2016

An appropriate way to fabricate a hybrid composite containing evenly dispersed carbon nano tubes(CNTs) is to stacking B-stage resin films that contain evenly dispersed CNTs and various reinforcing fiber layers alternatively. In the present study, B-stage resin films are manufactured via shear mixing and three-roll milling. CNT dispersion in resin via these two processes are evaluated by SEM on their fracture surfaces. For more efficient process, the dispersivities are evaluated according to the number of calendering passes. Samples are made for different number of passes during calendering, and their dispersions are evaluated via SEM fractographs as well as by measuring their electrical conductivities. Additionally, the optimal process conditions are obtained by measuring the electrical conductivity and evaluating their dispersivity of the samples prepared by gap mode and force mode.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.34 no.1
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• pp.56-64
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• 2006

This paper presents the development and application of a conducting shape memory polyurethane (CSMPU) actuator. While conventional shape memory polyurethanes were activated by external heat source, conducting shape memory polyurethanes introduced in 2004 are activated by electric power. Conducting shape memory polyurethane actuators were manufactured by adding carbon nano tube to conventional shape memory polyurethane. The main problem of the CSMPU developed in 2004 was bad dispersion of carbon nano tubes. In this paper, we tried to find how to solve the dispersion problem, and with a lot of elaborative works, conducting shape memory polyurethane actuators which had better electrical characteristics were developed. Then the actuation performance of the conducting shape memory polyurethane actuators was also measured and assessed. Finally, the possibility of applications were examined through the installation to Micro Air Vehicle.

• 한국정보디스플레이학회:학술대회논문집
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• 2003.07a
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• pp.194-197
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• 2003

The actively addressable carbon nanotube (CNT) emitters have been studied for stable and low-voltage driving field emission display (FED). The a-Si TFT and screen-printed CNT emitters were successfully integrated to fabricate the diode type active-matrix cathode and FED panel. Also, we propose a new FED architecture based on the actively controlled triode CNT emitters showing the properties of ideal triode type cathode with electron beam focusing effect.

• Proceedings of the Korean Vacuum Society Conference
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• 2011.02a
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• pp.453-453
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• 2011

탄소나노튜브(CNT)를 이용한 전도성 투명 박막은 기존의 산화인듐주석(ITO)보다 가공 공정이 매우 간단하고 제조비용이 저렴하여 다양한 제품에 적용시킬 수 있고, 다양한 기판에 형성시킬 수 있어 새로운 유형의 제품을 만들 수 있는 가능성이 있다. 본 연구에서는 CNT를 이용하여 만든 투명 박막의 전도특성을 높이기 위하여 기존의 CNT 박막에 금속 이온간의 산화-환원 반응을 이용하여 Tin(II) chloride와 silver nitrate로 Ag seed를 형성시켜 투명 전도막 효율 변화를 측정하였다.

• Journal of Korean Society of Water and Wastewater
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• v.26 no.6
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• pp.883-888
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• 2012

Anode electrode is one of the most important factors in microbial fuel cell (MFC). This study was conducted to investigate the effects of mediator as methylene blue (MB) and electrode surface area on the power density of MFC with sponge and carbon nano tube (CNT) electrode (SC). The SC electrode with MB (MC) showed the maximum power density increased from 74.0 $mW/m^2$ to 143.1 $mW/m^2$. The grid shaped sponge and CNT (GSC) electrode showed the maximum power density of 209.2 $mW/m^2$ due to the increase of surface area from 88.0 to 152.0 $cm^2$. The GSC electrode with MB (GMC) revealed the maximum power density of 384.9 $mW/m^2$ which was 5.2 times higher than that obtained from the MFC with SC. Therefore MB and increase of surface area led to enhance the performance of microbial fuel cell such as power density.

• 한국신재생에너지학회:학술대회논문집
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• 2007.06a
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• pp.331-334
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• 2007

탄소나노튜브는 화학적 안정성과 고전도성을 갖는 동시에 높은 비표면적을 지니고 있다. 이와 같은 특정으로 염료감응형태양전지의 상대전극으로 사용 가능이 기대되어 지고 있으나, 아직 성공적인 연구가 발표되고 있지 않다. 많은 연구자들이 CNT 자체만으로 원하는 효과를 얻지 못하고 있기 때문에, CNT 조작(가공)을 통해 CNT 특성을 올리고자 노력하였다. 그러나 본 연구에서, 가공하지 않은 CNT powder를 이용하여 paste를 제조하고 doctro-blade법으로 코팅하여 CNT counter electrode를 제조하여 DSSC의 상대전극으로써의 적용 가능성을 조사 해 보았다. 제조된 CNT counter electrode에 대한 CNT 자체만의 전기화학적 특성을 측정하였다. 그리고 DSSC 에 직접 적용하여 전지의 광전특성을 측정하였다. 그 결과 탄소나노튜브의 고전도성 특성과 넓은 비표면적 특성에 의해 상대전극의 전해질/전극계변에서의 전해질의 산화환원 반응에 대한 촉매 작용을 향상시키고, 상대전극 표변에서의 전자전달 속도를 높여 염료감응형 태양전지의 효율을 높이는 것으로 확인되어졌다.