• 공업화학
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• 제29권5호
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• pp.533-540
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• 2018

그래핀은 표면 에너지가 낮고 원자단위의 얇은 물질로서 다양한 소재의 표면에 코팅시키거나 윤활제에 분산시켜 접착력과 마찰을 줄여주는 우수한 윤활유 첨가제로 보고되고 있다. 본 연구에서는 산화 그래핀 나노시트를 세 가지 종류의 염화알킬(butyl chloride, octyl chloride 및 tetradecyl chloride)을 이용하여 액체 윤활제 첨가제용 기능화 산화 그래핀(alkyl functionalized GO, FGO)을 제조하였다. 제조한 기능화 산화 그래핀의 화학적 및 구조적 특성은 Fourier transform infrared (FT-IR), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscope (SEM), and transmission electron microscope (TEM)으로 분석하였다. 제조한 기능화 산화 그래핀은 PAO-0W40 오일에 0.02 wt%의 농도로 분산시켰으며, 트라이볼로지적 특성을 high frequency friction/wear tester로 분석한 결과, FGO-14이 첨가된 PAO-0W40 오일은 ball-on-disk의 직선왕복운동 하에서 기유에 비해 ~5.88%의 마찰계수와 ~3.8%의 마모 트랙 폭을 감소시킴으로써 내마모성이 향상됨을 확인하였다. 본 연구에서는 산화 그래핀의 성공적인 기능화와 더불어 다양한 탄화수소사슬 길이에 따른 분산 안정성 및 트라이볼로지적 특성의 향상을 입증하였다.

• Applied Microscopy
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• 제39권1호
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• pp.41-48
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• 2009

본 연구는 색조화장품에 사용되는 진주광택안료의 특성을 주사전자현미경과 에너지분산분광분석기 및 열분석기를 사용하여 규명하였다. 본 연구에 사용된 인공합성 진주광택안료를 여성의 볼과 눈두덩 부위에 화장을 한 후 육안으로 관찰하였을 때 진주 광택안료는 보는 각도에 따라 흰색에서 보라색까지 다양한 색조로 빛을 반사하였다. 진주광택안료의 주사전자현미경 관찰 결과 안료는 얇은 판상의 다각형의 형태를 하고 있었으며 크기는 규격화된 모양이 아니고 다양하게 관찰되었다. 이런 조각의 크기는 약 $30{\mu}m$에서 $300{\mu}m$까지 측정되었고 안료 조각은 끝이 뾰족하거나 각진 상태로 존재하였다. 고배율의 주사전자현미경상에서 안료조각의 모서리 부위와 측면은 날카롭지 않은 타원형의 형태로 나타났으며 두께는 약 $9{\mu}m$로 측정되었다. 안료조각 표면은 직경이 약 60 nm의 이산화티탄 입자들에 의해서 피복되어 있었다. 진주광택안료의 에너지분산분석기를 사용하여 구성 원소 성분을 분석한 결과 안료의 표면은 O, Si, C, Na, Ca, Ti, Zn 등이 검출되었고 안료의 측면 부위도 동일한 성분들이 검출되었다. 이들 안료는 운모 티타니아(mica titania)로 확인되었다. 진주광택안료의 열분석 결과 초기 $100^{\circ}C$부터 $800^{\circ}C$까지 중량 감소는 큰 차이를 보이지 않았다. 열분석 결과 $115^{\circ}C$에서 1.1% 중량 감소를 하였고 $416^{\circ}C$에서 1.7% 감소하였으며 $797^{\circ}C$ 에서 1.9%의 중량이 감소된 것을 확인하였다.

• 한국응용과학기술학회지
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• 제28권4호
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• pp.393-401
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• 2011

Natural Curcumin belongs to Zingiber Officinale Roscoe was known to possess natural odor, natural taste, natural color, and other pharmaceutical & chemical characteristics. Natural Curcumin extract was made to use ethanol as a solvent was to show a yellow color having state of solid powder and an active component. Natural Curcumin extract tested pharmaceutical & chemical experiment to dilute in curcumin 1%-water solution. Curcumin extract tested antimicrobial experiment using microbe, and tested dye experiment using fiber. Some conclusions in the result of characteristics experiment was obtained as follow. The result of antimicrobial experiment showed that the growth of staphylococcus aureus (ATCC-001) and aspergillus niger (ATCC-002) as microbes decreased according to passage of time. This phenomenon could know that Curcumin compoment showed influence to antimicrobial effect. Also, the result of dye experiment showed that cotton and sick with fiber dyeing dyed in direction of dark yellow color. This phenomenon could know that Curcumin extract showed influence to dyeing effect in observation of optical electron microscope(OEM.) The result of instrument analysis ascertained inorganic components of K(53.300ppm), Na(1.150ppm), Ca(0.711ppm), Ti(0.351ppm), Li(0.256ppm), Cu(0.233ppm) etcs from Curcumin component with ICP/OES, and ascertained organic components of propanoic acid(1.859), benzene(10.814), phenol(14.194) etcs from Curcumin component with GC/MSD.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2009년도 하계학술대회 논문집
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• pp.5-6
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• 2009

In this paper, plasma ion implant is performed with $PH_3$ gas diluted by helium gas on P-type Si wafer (100). Spike Rapid Thermal Processing(RTP) annealing performed for 30~60 sec from $800\;^{\circ}C$ to $1000\;^{\circ}C$ in $N_2+O_2$ ambient. Crystalline defect is analyzed by Transmission Electron Microscope(TEM) and Double crystal X-ray Diffraction(DXRD). Contact resistivity($\rho c$), contact resistance(Rc) and sheet resistance(Rs) are analyzed by measuring Transfer Length Method(TLM) using 4155C analysis. As annealing temperature increase, Rs decrease and ${\rho}c$ and Rc increase at temperature higher than $850\;^{\circ}C$. We achieve low Rs, ${\rho}c$ and Rc with Plasma ion implant and spike RTP.

• 대한한의학회지
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• 제23권4호
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• pp.27-31
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• 2002

Background and Purpose: There has been little study about the quality of acupuncture needle tips. In order to ensure safe acupuncture treatment, high quality of needle tips is essential. Therefore, we investigated the current condition of the tips of the acupuncture needles on the market. Methods: We selected needles made by 6 companies in Korea, one company each in Japan, the USA and China, and observed the tip of each needle using a scanning electron microscope. Results and Discussion: We found that needles had several defects such as scratch marks on the surface, metallic scuff, lumps and irregularities of the needle tips, stubbed or malformed tips, tips of point off-center, and peeled off coated tips. There were more faulty ones than good ones. Further, better-designed study with a bigger sample size is warranted.

• 센서학회지
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• 제16권4호
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• pp.301-306
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• 2007

AlN thin film for SAW filter application was deposited on (100) silicon wafers by reactive magnetron sputtering method. The structural characteristics were dependent on the deposition conditions such as sputtering pressure, RF power, substrate temperature, and nitrogen partial pressure. Scanning Electron Microscope (SEM), X-ray Diffraction (XRD), Electron Probe MicroAnalyzer (EPMA) and Atomic Force Microscope (AFM) have been used to find out structural properties and preferred orientation of AlN thin films. Insertion loss of SAW devices was 28.51 dB and out of band rejection was about 24 dB.

• 대한수의학회지
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• 제24권2호
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• pp.227-236
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• 1984

A migratory bird, the white stork, Ciconia boyciana was captured from a pond in the Cheju Island on the 18th of December in 1982. The morphological characteristics were described as seen in the binocular stereoscopic microscope and the further fine structures were observed by means of the scanning electron microscope (Model; ISI-DS-130). The bird was examined for the ectoparasites at the Cheju Provincial Veterinary Research Laboratory. Two kinds of specimens were collected from the head and body feathers. The specimens were sent to the Institute of Veterinary Research in Anyang for the classification and identification. The specimens preserved in 70% ethyl alcohol were examined and identified as the fowl head-louse, Cuclotogaster heterographus and the slender goose-louse, Anaticola anseris both classified into Family Philopteridae, Ischnocera, Order Mallophaga.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2007년도 추계학술대회 논문집
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• pp.154-157
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• 2007

The austenite phase observed in low carbon HSLA steels is well known to be decomposed to various bainitic microstructures, such as granular bainite, acicular ferrite and bainitic ferrite during continuous cooling process. These bainitic microstructures have been usually identified by using either scanning electron microscope (SEM) or transmission electron microscope (TEM). However, SEM and TEM images do no exactly coincide, because of the quite different sample preparation method in SEM and TEM observations. These conventional analysis method is, thus, not suitable for characterization of the complex bainitic microstructure. In this study, focused ion beam (FIB) technique was applied to make site-specific TEM specimens and to identify the 3-dimensional grain morphologies of the bainitic microstructure. The morphological feature and grain boundary characteristics of each bainitic microstructure were exactly identified.

• 한국응용곤충학회지
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• 제30권4호
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• pp.285-290
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• 1991

Dacetini족의 1미기록종이 Smithistruma japonica(Ito)가 거금도에서 채집확인 되었기에 한국명을 톱니비늘개미속 톱니비늘개미로 명명 기재하여 보고하며, 주사전자현미경을 사용하여 비늘개비와 톱니비늘개미의 형질특성 차이에 대하여 기재한다. 한국산 비늘개비족(Dacetini tribe)은 모두 2속 2종이 된다.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2021년도 가을 학술논문 발표대회
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• pp.17-18
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• 2021

In the present study, Al-Zn coating was deposited by Arc thermal (AT) and plasma arc thermal (PAT) spray processes, and their corrosion characteristics were studied in 3.5% NaCl through electrochemical impedance spectroscopy (EIS), scanning electron microscope (SEM) and mechanical tests. The bond adhesion result showed that plasma arc sprayed coating had a higher value attributed to compact, dense, and less porous coating compared to arc thermal spray coating which contains defects/pores and uneven morphology as revealed by scanning electron microscope analysis. Electrochemical results revealed that the plasma arc sprayed coating had a high polarization resistance at early stage of immersion, suggesting its excellent corrosion protection performance.