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전기방사법을 이용한 Ag 나노입자 분산 고분자 나노파이버와 Ag 나노파이버 제조 및 특성 평가
김희택,황치용,송한복,이근재,주연준,홍성재,강남기,박성대,김기도,좌용호,Kim, Hee-Taik,Hwang, Chi-Yong,Song, Han-Bok,Lee, Kun-Jae,Joo, Yeon-Jun,Hong, Seong-Jei,Kang, Nam-Kee,Park, Seong-Dae,Kim, Ki-Do,Cho, Yong-Ho 한국분말야금학회 2008 한국분말재료학회지 (KPMI) Vol.15 No.2
Functional nanomaterial is expected to have improved capacities on various fields. Especially, metal nanoparticles dispersed in polymer matrix and metal nanofiber, one of the functional nanomaterials, are able to achieve improvement of property in the electric and other related fields. In this study, the fabrication of metal (Ag) nanoparticle dispersed nanofibers were attempted. The Ag nanoparticle dispersed polymer nanofiber and Ag nanofiber were fabricated by electrospinning method using electric force. First, PVP/$AgNO_3$ nanofibers were synthesized by electrospinning in $18{\sim}22kV$ voltage with the starting materials (Ag-nitrate) added polymer (PVP; poly (vinylpyrrolidone)). Then Ag nanoparticle dispersed polymer nanofibers were fabricated to reduce hydrogen reduction at $150^{\circ}C$ for 3hr. And Ag nanofibers were synthesized by the decomposited of PVP at $300{\sim}500^{\circ}C$ for 3hr. The nanofibers were analyzed by XRD, TGA, FE-SEM and TEM. The experimental results showed that the Ag nanofibers could be applied in many fields as an advanced material.
도시 소각로 쓰레기 소각후 생성된 폐가스 및 비산재중에 포함된 다이옥신류의 측정 및 특성고찰
임채현,김희택,손정현,장윤석 ( Chae Hyun Lim,Hee Taik Kim,Jung Hyun Sohn,Yoon Seok Chang ) 한국공업화학회 1997 공업화학 Vol.8 No.5
일반적으로 독성물질의 전형으로 알려진 다이옥신은 다양한 경로로 발생하여 인간과 환경에유입되지만 대부분은 연소과정에서 발생된다. 본 실험에서는 EPA 방법에 의해 쓰레기 소각 처리후 생성된 폐가스와 비산재에 함유된 다이옥신류의 분포형태를 조사하고, 보다 효율적인 시료채취와 전처리 방법을 살펴보았다. 가스시료는 등속흡인하여 포집하였으며, 전 처리시 고체, 액체시료는 각각 속실렛과 액-액 추출법으로 추출하고 실리카겔, 알루미나, 활성탄 칼럼으로 정재한 후 고분해능 가스크로마토그래피 /질량분석기(HRGC/H-RMS)로 분석하였다. 굴뚝 배출가스의 등속흡인결과 상대오차율이 평균 96.5%로서 안정적으로 시료가 흡인되었음을 확인하였으며, 폐가스와 비산재에서 측정된 다이옥신과 퓨란류는 선진국과 유사한 패턴을 나타냈다. 굴뚝 배출가스중 다이옥신과 퓨랸의 양은 각각 1076.20pg/Nm³과 1452.34 pg/Nm³으로 나타났다. 주로 염소원자 7∼8개로 치환된 이성체가 많았으며, 독성이 가장 강한 2,3,7,8-TCDD는 8.84pg/Nm³으로서 전체 양의 0.64%를 차지해 비교적 낮게 확인되었다. Polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofuransfurans are the archetype of toxic chemicals. So it has absorbed public attention. The major primary sources of PCDDs and PCDFs are chemical, thermal and photochemical reactions. Municipal solid waste incinerator facilities has been reported as the major contributors of dioxins to the environment. In this paper, Dioxins and furans were examined emission gas and fly ash produced during combustion in municipal solid waste incinerator. More effective method for sampling, extraction was described. The sample was extracted using a soxhlet method and purified using silicagel, alumina and carbon fibre HPLC to remove interfering compound. The extract was then analyzed by HRGC / HRMS. The result of this study showed recovery standard was good and the data resembled those of thermal processes. Total dioxins and furans were 1076.20 pg/Nm³ and 1452.34 pg/Nm³ respectively. The amount of highly chlorinated compound was more than that of lowly chlorinated compound. The 2,3,7,8-substituted TCDD was just 0.34% of the total dioxins / furans amount.
흡수식냉난방기용 다성분 리튬염 작동매체의 증기압 및 용해도 측정
주우성,김희택,오영삼,백영순 ( Woo Sung Ju,Hee Taik Kim,Young Sam Oh,Young Soon Baek ) 한국공업화학회 1998 공업화학 Vol.9 No.1
고효율 공냉형 흡수식 냉방기를 위한 신작동매체로 기존의 LiBr-H₂O계에 높은 흡수성과 용해성를 지닌 LiNO₃과 LiCl 무기물을 각각 첨가하여 제조하였다. 본 연구를 통하여 제조된 다성분계의 작동매체에 대한 용해도와 증기압을 측정하여 기존의 LiBr-H₂O계와 비교 분석하였으며, 이들에 대한 최적혼합비를 각각 구하였다. 용해도 측면에서 LiBr-LiNO₃-H₂O계의 경우, LiBr과 LiNO₃의 최적혼합 몰비는 5 : 1이었으며, 반면 LiBr-LiNO₃-H₂O계의 경우 LiBr, LiNO₃, LiCl의 최적흔합몰비는 5 : 1 : 2로 나타났다 한편 증기압은 LiBr-H₂O계에 LiNO₃의 첨가량이 증가함에 따라 증가하였으나, LiCl의 경우 에는 첨가량이 증가함에 따라 감소하는 경향을 각각 나타내었다. In an effort to obtain high efficiency in air cooled absorption heat pump, a new working fluid has been developed with the addition of LiNO₃ and LiCl to the conventional solution of LiBr-H₂O. The solubility and vapor pressure of the multicomponent salts solution developed in this work were measured and compared with the results of LiBr-H₂0 solution. It was observed that there exists an optimal molar ratio of the inorganic salts in terms of solubility. The molar ratio of LiBr and LiNO₃ was found to be about 5 : 1 in the LiBr-LiNO₃ mixture, and in the case of LiBr-LiNO₃-LiCl mixture, the molar ratio of LiBr, LiNO₃ and LiCl was found to be around 5 : 1 : 2. The vapor pressure of the multicomponent salts solution of the optimal molar ratio was increased with adding LiNO₃, while decreased with adding LiCl.