• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2011년도 춘계학술대회 논문집
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• pp.777-778
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• 2011

• 한국정밀공학회지
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• 제33권1호
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• pp.45-51
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• 2016

The present study uses an electron beam (e-beam) to modify the wetting characteristics of thermoplastic polymer surfaces. A high energy e-beam irradiated various polymer surfaces (PET, PMMA, and PC), with variations in irradiation time and applied current. The water contact angles were measured on the e-beam irradiated surfaces in order to investigate the changes in the surface energy and the relevant wettability. Furthermore, XPS analyses were performed to investigate the chemical composition change in the e-beam irradiated surfaces; the results showed that the hydrophilic groups (C-O) increased after the electron beam irradiation. Also, water collection tests were performed for various polymer samples in order to investigate the effect of the surface energy on the ability of water collection, from which it can be seen that the irradiated surfaces revealed better water-collecting capability than pure polymer surfaces.

• Journal of Information Display
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• 제3권4호
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• pp.8-12
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• 2002

We have carried out a simulation study on an e-beam addressed liquid crystal projection display in which the liquid crystal is switched by the electric field of the charge, produced by an electron beam, on the surface of the display. We calculated the electric field produced by the surface charge, the liquid crystal director configuration and the profile of the transmitted light. We studied the factors affecting the resolution of the display and the effect of pretilt angle on the performance of the display. The e-beam addressed liquid crystal projection display potentially has the advantages of high resolution and high brightness.

• Carbon letters
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• 제15권2호
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• pp.129-135
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• 2014

Spinnable pitch for melt-electrospinning was obtained from pyrolized fuel oil by electron beam (E-beam) radiation treatment. The modified pitch was characterized by measuring its elemental composition, softening point, viscosity, molecular weight, and spinnability. The softening point and viscosity properties of the modified pitch were influenced by reforming types (heat or E-beam radiation treatment) and the use of a catalyst. The softening point and molecular weight were increased in proportion to absorbed doses of E-beam radiation and added $AlCl_3$ due to the formation of pitch by free radical polymerization. The range of the molecular weight distribution of the modified pitch becomes narrow with better spinning owing to the generated aromatic compounds with similar molecular weight. The diameter of melt-electrospun pitch fibers under applied power of 20 kV decreased 53% ($4.7{\pm}0.9{\mu}m$) compared to that of melt-spun pitch fibers ($10.2{\pm}2.8{\mu}m$). It is found that E-beam treatment for reforming could be a promising method in terms of time-savings and cost-effectiveness, and the melt-electrospinning method is suitable for the preparation of thinner fibers than those obtained with the conventional melt-spinning method.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2013년도 제45회 하계 정기학술대회 초록집
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• pp.138.1-138.1
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• 2013

We present the low temperature (${\leq}1,000^{\circ}C$) vacuum sublimation behavior of an e-beam evaporative deposited on a SiC film and a method to reduce the vacuum sublimation through an ion beam process. The density of the SiC film deposited using the e-beam evaporation method was ~60% of the density of the bulk source material. We found that the sublimation became appreciable above ${\sim}750^{\circ}C$ under $1.5{\times}10^{-5}$ torr pressure and the sublimation rate increased with an increase in temperature, reaching ~70 nm/h at $950^{\circ}C$ when the coated sample was heated for 5 h. When the film was irradiated with 70 keV N+ ions prior to heating, the sublimation rate decreased to ~23 nm/h at a fluence of $1{\times}10^{17}\;ions/cm^2$. However, a further increase in fluence beyond this value or an extended heating period did not change (decrease or increase) the sublimation rate any further.

• Journal of the Optical Society of Korea
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• 제14권2호
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• pp.127-130
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• 2010

We have developed an efficient electron beam (e-beam) source, a microcolumn, that can be used as a source module for of microscopy and its applications. To obtain a low operating voltage, a very sharp cold field electron emitter was developed by electrochemically etching a tungsten wire. Laser diffraction was used for the fabrication of high-quality electron lenses and for their precise alignment. The measurement of the e-beam currents, and SEM images captured by the microcolumn confirmed the potential of the device as a very good e-beam source.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2003년도 International Meeting on Information Display
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• pp.802-805
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• 2003

The ion-induced secondary electron emission coefficient ${\gamma}$ for MgO thin film with $O_{2}$ plasma treatment has been investigated by ${\gamma}$-FIB (focused ion beam) system. The MgO thin film deposited from sintered material with $O_2$ plasma treatment is found to have higher ${\gamma}$ than that without $O_{2}$ plasma treatment. The energy of $Ne^{+}$ ions used has been ranged from 100eV to 200eV throughout this experiment. It is found that the highest secondary electron emission coefficient ${\gamma}$ has been achieved for 10 minutes of $O_{2}$ plasma treatment.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2004년도 Asia Display / IMID 04
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• pp.525-528
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• 2004

The ion-induced secondary electron emission coefficient ${\gamma}$ and work function for MgO thin film with $O_2$ plasma treatment has been investigated by ${\gamma}$ -FIB (focused ion beam) system. The MgO thin film deposited from sintered material with $O_2$ plasma treatment is found to have higher ${\gamma}$ and lower work function than those without $O_2$ plasma treatment. The energy of various ions used has been ranged from 100eV to 200eV throughout this experiment. It is found that the highest secondary electron emission coefficient ${\gamma}$ has been achieved for 10 minutes of $O_2$ plasma treatment under RF power of 50W.

• 한국지반환경공학회 논문집
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• 제13권10호
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• pp.69-76
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• 2012

본 연구에서는 전자빔공정(Electron beam process, E-beam)에서 생성되는 수산화라디칼의 생성특성을 조사하였고, 이 공정에 첨가제로 과산화수소와 $Fe^{3+}-EDTA$을 이용한 펜타클로로페놀(Pentachlorophenol, PCP)의 분해 특성을 조사하였다. 이를 위해 수산화라디칼의 측정은 벤조산(Benzoic Acid, BA)에 의한 hydroxylation으로 생성된 hydroxybenzoic acid(OHBA)의 농도를 정량화하여 수행하였다. 실험결과, 실제 측정된 수산화라디칼의 농도는 예측된 수산화라디칼에 비해 낮은 농도로 나타났으며, 이것은 아마도 E-beam 에너지의 조사와 동시에 형성되는 다양한 반응성 화학종이 수산화라디칼을 스케빈져(scavening)할 것으로 생각되었다. 특히, 1mM 이하의 과산화수소 주입은 PCP 분해를 촉진시킬 수 있으나 그 이상의 과산화수소의 주입은 오히려 PCP의 분해를 감소시키거나 PCP의 부산물인 염소이온과 Carbon yield(%)를 증가시키는 요인으로 작용하였다. 반면에, $20{\mu}M$의 $Fe^{3+}-EDTA$ 첨가는 효과적으로 PCP를 제거하였고, 이에 따른 G-value도 증가한 것으로 나타났다. OHBA의 형성과 PCP의 분해를 고려하여 보면, 결과적으로 E-beam공정에 가하는 $Fe^{3+}-EDTA$의 첨가는 상대적으로 낮은 세기에서도 효과적으로 PCP를 처리할 수 있을 것으로 생각된다.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2011년도 춘계학술대회 논문집
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• pp.215-216
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• 2011