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현재영,최정미,박윤선,강지훈,석중현,Hyeon, Jae-Young,Choi, Jung-Mi,Park, Youn-Sun,Kang, Jiehun,Sok, Junghyun 한국진공학회 2013 Applied Science and Convergence Technology Vol.22 No.3
연속적인 1차원의 나노섬유를 제작하는데 빠르고 효과적인 방법인 전기방사법을 이용하여 Ag 나노섬유로 이루어진 투명전극을 제작하고 그 특성을 측정하였다. 전기방사를 통해 제조된 Ag 나노섬유는 큰 종횡비를 갖게 되며 열처리를 통해 생성된 섬유사이의 fused junction이 접촉저항을 낮추어 전기적 특성을 향상시킨다. Ag/고분자 용액을 졸-겔 방법을 이용하여 제조한 후 glass 기판위에 방사시켜 Ag/고분자 나노섬유 구조체를 제작하고 $200{\sim}500^{\circ}C$, 2시간 열처리하여 고분자가 일정부분 제거되고 전도성이 향상된 Ag 나노섬유 투명전극을 제조하였다. Ag 나노섬유의 모폴로지를 FE-SEM을 통해 확인하였고 Ag 나노섬유 투명전극의 투과도와 면저항을 UV-vis-NIR spectroscopy와 I-V특성 측정장치를 사용하여 측정하였다. 투과도 83%에서 면저항 $250{\Omega}/sq$의 투명전극을 제작하였으며 전도성필름에 적합한 수준이다. Ag 나노섬유로 이루어진 투명 전극은 전기적, 광학적, 기계적 특성이 우수하여 차세대 유연 디스플레이에 적용 가능성을 보여준다. We fabricated transparent conductive electrodes with silver (Ag) nanofibers by electrospinning process. Ag nanofibers have high aspect ratio and fused junctions which result in low sheet resistance. Electrospinning is a fast and efficient process to fabricate continuous one-dimensional (1D) nanofibers. Ag/polymer ink were prepared in polymer matrix solution by a sol-gel method. Then, Ag/polymer nanofibers precursors are heated at $200{\sim}500^{\circ}C$ in air for 2 h to eliminate partially the polymers. The topographical features of the Ag nanofibers were characterized by FE-SEM, and the electrical property was analyzed through I-V measurement system. Finally, optical property was measured using UV/VIS spectroscopy. The transparent conductive electrodes with Ag nanofibers exhibited a sheet resistance (Rs) of $250{\Omega}/sq$ at a transparency (T) of 83%. Transparent conductive films, contain the Ag nanofibers as conductive materials, have good electrical, optical, and mechanical properties. Therefore, it is expected to be useful for the application of flexible display in the future.
현재영,좌성훈,박경완,석중현 대한금속·재료학회 2020 대한금속·재료학회지 Vol.58 No.9
We fabricated a transparent conducting electrode composed of graphene oxide (GO) and silver (Ag) nanofibers. The graphene oxide was spray-coated on the Ag nanofiber film, which was fabricated by electrospinning process. Ag/poly(vinyl alcohol) ink was fabricated in a polymer matrix solution using the solgel method. The sprayed film was sintered at 200 oC for 100 min under H2/Ar atmosphere. The optical transmittance of the transparent electrodes was measured by UV/VIS spectroscopy, and sheet resistance was measured using I-V measurement system. As the amount of GO sprayed on the nanofibers increased, the diameters of the nanofibers increased, therefore, the transmittance of the electrode linearly decreased. However, the conductivity of the electrode increased. This is because the sprayed GO filled the gap between the nanofibers, and GO deposited on the surface of the nanofibers will form more effective electron pathways, resulting in increased conductivity. The GO-Ag nanofiber electrode also exhibited excellent environmental stability, and the sheet resistance of the electrode remained very stable during 30 days testing. The lowest sheet resistance of the transparent electrode was 250 ohm/sq with approximately 83% transparency at a wavelength of 550 nm. This excellent electrical properties and environmental stability might facilitate applications of the GO-Ag nanofiber electrode in optoelectronic devices.
단호박 "보짱" 장기저장을 위한 염소수 및 구연산 전처리 효과
박도수 ( D. S Park ),현재영 ( J. Y. Hyun ),권혜순 ( H. S. Kown ),정천순 ( C. S. Jeong ) 강원대학교 농업생명과학연구원(구 농업과학연구소) 2016 강원 농업생명환경연구 Vol.28 No.1
단호박 ``보짱`` 장기 저장을 위한 염소수 및 구연산 전처리 후 적정 저장온도를 구명하기 위한 연구결과는 다음과 같다. 중량손실은 염소수 처리구 보다는 구연산 처리구에서 다소 많았고, 저장온도는 7℃보다는 10℃에서 적었다. 부패율은 저장 2 개월째부터 부패하기 시작하였으며, 무처리구>염소수>구연산 순으로 나타났다. 저장온도별로는 7℃ 보다는 10℃에서 저장 5 개월까지 살균 처리구에서 2% 내외로 매우 낮게 나타났다. 가용성 고형물 함량은 구연산 보다 염소수에서 높게 유지되었고, 10℃보다는 7℃에서 높았다. 그리고 저장초기(약 14°Brix)부터 저장 4 개월째(약 17°Brix)까지는 증가한 다음 감소하는 경향을 보였다. 경도는 무처리구보다 염소수처리구가 단단하였고, 10℃ 보다는 7℃에서 높게 유지되었다. 과육의 색도는 살균 처리구 간에 차이가 없었고, 7℃보다는 10℃에서 다소 높게 유지되었다. 전분함량은 수확직후에는 약 20%에서 저장 1 개월째부터 감소하였고, 저장온도 및 살균처리구간에 차이는 없었다. 단호박의 당함량은 주로 비환원당인 sucrose 가 환원당인 glucose+fructose 함량보다 약 2 배 이상 많았다. 당함량은 구연산 처리구에서 타 처리구보다 감소폭이 많았고, 10℃ 저장보다는 7℃ 저장에서 높게 유지되었다. 총페놀함량은 저장기간 및 살균처리 구간에서 일정한 경향은 없었지만, 저장 6 개월까지 점증하는 경향을 나타냈다. This study was done to investigate proper long term storage temperature of squash ``Bochang`` after pre-treatment with NaOCl and citric acid. Weight loss was somewhat higher in citric acid treatment group than NaOCl treatment and it is lower in 7℃ than 10℃ treatment. Decay rate the loss percentage after 2 months, it appeared as Untreated > NaOCl > citric acid. In both sterilization treatment groups, storage at 10℃ is better than 7℃ and stored up to 5 months with very low difference of about 2%. Soluble solids content was higher in NaOCl treatment than citric acid and it was higher in 7℃ than 10℃. At the beginning of storage total soluble solids content (TSS) was about 14°Brix and 4 months after storage it was reached about 17°Brix and then a decreasing trend was observed. Higher firmness values were observed in NaOCl treatment than control and treatments in 7℃ were firmer than 10℃. No significant difference was observed among the sterilization treatments regarding flesh color, a slightly higher values were recorded in 10℃ than 7℃. Starch content immediately after harvest was about 20% and reduced after 3 months storage, no significant difference was observed in storage temperature and sterilization treatments. Squash sugar content is mainly non reducing sugar sucrose and reducing sugar (glucose+fructose) were about 2 times of the content. The decline in sugar content was higher in citric acid treatment than the others and it was higher in 7℃ than 10℃. Even though; there exist no certain data regarding total phenolic content during storage period and sterilization period, it showed a tendency to an increasing storage 6 months.
Wan Meng,권오형,강인규,현재영,Xinglin Guo,조얼령 한국생체재료학회 2002 생체재료학회지 Vol.6 No.2
A-B-A type block copolymers were prepared by the polymerization of (-benzyloxycarbonyl L-lysine N-carboxyanhydride) (A segment) using amino-terminated polyoxypropylene (POP, B segment) as an initiator. The morphology of the block copolymers showed POP domains dispersed in the poly(-benzyloxycarbonyl L-lysine) (PBCL) matrix. Water contact angles of films of the block copolymer were almost same as that of the surface of PBCL film. Upon acid treatment of the block copolymer films, water contact angles decreased. Thrombus formation on block copolymer films was minimum for a POP content of 29 mol%. Identical results were obtained from a blood clotting test. The number of platelets adhered to the bulk and the surface-modified block copolymers was almost equal. However, serotonins were less released from the platelets adhered on the PL-2 block copolymer and surface-modified block copolymers (MPL-1, MPL-2, MPL-3).