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무기계 MnO<sub>x</sub>-WO<sub>3</sub>-TiO<sub>2</sub> 나노분말의 표면특성 및 자기마모형 수지 적용성 평가
신병길,박현,Shin, Byeongkil,Park, Hyun 해양환경안전학회 2016 海洋環境安全學會誌 Vol.22 No.2
선박 및 해양구조물에서의 생물학적 오손을 방지하기 위하여 나노크기의 $MnO_x-WO_3-TiO_2$ 분말을 졸겔법으로 합성하여 특성을 제어하였고, 입자의 결정과 미세구조 등 분체특성 평가를 실시하였다. 자기마모형 방오도료의 안료에 적용하기 위하여 수지에 첨가된 $TiO_2$계 나노분말 안료의 함량에 따른 표면특성 및 방오성능을 확인하였다. $TiO_2$계 안료의 분체특성으로 비표면적은 약 $90m^2/g$, 입자크기는 약 100 ~ 150 nm을 보였다. 텅스텐 산화물은 망간산화물과 티타늄산화물과 상관관계를 통해, 삼원계 분체가 분체특성 및 표면특성이 우수하였다. 망간산화물의 첨가는 독특한 산화환원 특성으로 인하여 방오성능을 증가시키고, 텅스텐 산화물은 안료의 분체특성을 향상시킴으로, 안료와 수지의 비율을 조절하여 분산성, 표면특성 및 방오성능을 제어하였다. 그 결과로, 분산성 및 표면특성에 있어서 1, 5 wt. % 안료가 첨가된 것이 일부 우수하였으나, 5개월 동안의 해상침지시험에서는 2 wt. % 함유된 시편이 높은 방오성능을 보여 해양구조물의 방오안료 적용가능성을 확인하였다. The $MnO_x-WO_3-TiO_2$ nanoscale powders were synthesized by sol-gel method in order to prevent the biological fouling on the ships and offshore structures. Powder characteristics and antifouling performance were investigated with respect to the crystalline, microstructure and surface property for application in self-polishing copolymer resins. The high antifouling activity of $TiO_2$-system biocide was attributed to its redox potential and soluble metal ions originating from tungsten oxides according to the improvements in the powder characteristics. Based on their physio-chemical characterizations, the specific surface areas of powders were about $90m^2/g$ and the grain size was in the region 100 ~ 150 nm. Powder characteristics and surface properties were improved by the addition of $WO_3$. Antifouling performance were analyzed according to their surface properties and static immersion tests to determine the effects of the $TiO_2$-system compounds. The surface of 2 wt. % added sample was clean for 5 month. This may be attributed to the ability of $MnO_x-WO_3-TiO_2$ powders to act as a promoter in antifouling agents.
신병길,조승현,이희수,박현 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
MnO<sub>x</sub>-CeO<sub>2</sub>-WO<sub>3</sub>/TiO<sub>2</sub> catalysts with different W/Ce ratio were synthesized by the sol-gel method for selective catalytic reduction (SCR) of NO<sub>x</sub> by NH<sub>3</sub> reductant at low-temperatures. The X-ray diffraction (XRD) patterns show that all samples were anatase TiO<sub>2</sub> phase, indicating that MnO<sub>x</sub>, CeO<sub>2</sub>, and WO<sub>3</sub> were well-dispersed on TiO<sub>2</sub> support in amorphous state. The surface acidity of MnO<sub>x</sub>-CeO<sub>2</sub>-WO<sub>3</sub>/TiO<sub>2</sub> catalysts were increased with increasing of W/Ce ratio from 0/10 to 9/1, thus the catalytic activity of W/Ce = 9/1 catalyst was much higher than others in the temperature range of 100 - 300°C under a gas hourly space velocity (GHSV) = 10,000 h<sup>-1</sup>.
Structure, surface acidity and catalytic activity of WO3-TiO2 catalyst for NH3-SCR of NOx
신병길,Teng Wan Dung,이희수 한양대학교 세라믹연구소 2014 Journal of Ceramic Processing Research Vol.15 No.2
WO3-TiO2 catalysts were prepared by an incipient wet-impregnation method for high-temperature selective catalytic reduction (SCR) of NOx. Structure, surface acidity, and catalytic performance of SCR catalyst according to WO3 content (4, 6, 8, and 10 wt.%) were characterized by morphological and spectroscopy analyses. The 10 wt.% WO3-TiO2 catalyst had high conversion efficiency due to the improvement of specific surface area, catalytic acidity, and monolayer capacity of TiO2 support. It was found that tungsten oxide species are dispersed in the interlayer between the grain and the grain boundary of TiO2 support in transmission electron microscopy. The WO3 affected the suppressed grain growth and the improved Brønsted acid sites that could provide much surface acidity by the grain boundary reinforcement. The structural interaction between the proper WO3 content and TiO2 support led to the existence of octahedrally and tetrahedrally coordinated WO3 structures on the surface in the Raman spectra. The enhanced catalytic activity of 10 wt.% WO3-TiO2 is attributed to the increase of the surface acidity (Brønsted acid sites) by the shell formation of WO3 species.
무기계 MnOx-WO3-TiO2 나노분말의 표면특성 및 자기마모형 수지 적용성 평가
신병길,박현 해양환경안전학회 2016 海洋環境安全學會誌 Vol.22 No.2
선박 및 해양구조물에서의 생물학적 오손을 방지하기 위하여 나노크기의 MnOx-WO₃-TiO₂ 분말을 졸겔법으로 합성하여 특성을 제어하였고, 입자의 결정과 미세구조 등 분체특성 평가를 실시하였다. 자기마모형 방오도료의 안료에 적용하기 위하여 수지에 첨가 된 TiO₂계 나노분말 안료의 함량에 따른 표면특성 및 방오성능을 확인하였다. TiO₂계 안료의 분체특성으로 비표면적은 약 90 m²/g, 입자 크기는 약 100 ~ 150 nm을 보였다. 텅스텐 산화물은 망간산화물과 티타늄산화물과 상관관계를 통해, 삼원계 분체가 분체특성 및 표면특성이 우수하였다. 망간산화물의 첨가는 독특한 산화환원 특성으로 인하여 방오성능을 증가시키고, 텅스텐 산화물은 안료의 분체특성을 향상시킴으로, 안료와 수지의 비율을 조절하여 분산성, 표면특성 및 방오성능을 제어하였다. 그 결과로, 분산성 및 표면특성에 있어서 1, 5 wt. % 안료가 첨가된 것이 일부 우수하였으나, 5개월 동안의 해상침지시험에서는 2 wt. % 함유된 시편이 높은 방오성능을 보여 해양구조물의 방오안료 적용가능성을 확인하였다. The MnOx-WO₃-TiO₂ nanoscale powders were synthesized by sol-gel method in order to prevent the biological fouling on the ships and offshore structures. Powder characteristics and antifouling performance were investigated with respect to the crystalline, microstructure and surface property for application in self-polishing copolymer resins. The high antifouling activity of TiO₂-system biocide was attributed to its redox potential and soluble metal ions originating from tungsten oxides according to the improvements in the powder characteristics. Based on their physio-chemical characterizations, the specific surface areas of powders were about 90 m²/g and the grain size was in the region 100 ~ 150 nm. Powder characteristics and surface properties were improved by the addition of WO₃. Antifouling performance were analyzed according to their surface properties and static immersion tests to determine the effects of the TiO₂-system compounds. The surface of 2 wt. % added sample was clean for 5 month. This may be attributed to the ability of MnOx WO₃ TiO₂ powders to act as a promoter in antifouling agents.
신병길 ( Shin Byoung Gil ),권지혜 ( Kwon Ji Hye ),정재훈 ( Jung Jae Hun ),임지숙 ( Lim Ji Sook ),오영석 ( Oh Yung Suk ) 한국구조물진단유지관리공학회 2018 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.22 No.2
Many countries are faced with the threats coming from aging of infrastructures and tries to find preparations. In that sense, comprehensive reports have published through performance evaluation on main infrastructures in the USA, Australia, and Japan etc. The government of South Korea shifted the policy from safety-oriented system toward performance-based system. The concept is included in the revised act, “Special Act on the Safety Control and Maintenance of Public Structures”. According to the Special Act, an annual comprehensive report will be issued in Korea. In this paper ‘Infrastructure Evaluation Report’ is analyzed as a reference.
NOx 제거용 WO3-TiO2 계 SCR 촉매 제조 및 열적열화거동연구
신병길 ( Byeong Kil Shin ),김장훈 ( Jang Hoon Kim ),윤상현 ( Sang Hyeon Yoon ),이희수 ( Hee Soo Lee ),신동우 ( Dong Woo Shin ),민화식 ( Wha Sik Min ) 대한금속재료학회(구 대한금속학회) 2011 대한금속·재료학회지 Vol.49 No.8
Thermal degradation behavior of a WO3-TiO2 monolithic catalyst was investigated in terms of structural, morphological, and physico-chemical analyses. The catalyst with 4 wt.% WO3 contents were prepared by a wet-impregnation method, and a durability test of the catalysts were performed in a temperature range between 400℃ and 800℃ for 3 h. An increase of thermal stress decreased the specific surface area, which was caused by grain growth and agglomeration of the catalyst particles. The phase transition from anatase to rutile occurred at around 800℃ and a decrease in the Brønsted acid sites was confirmed by structural analysis and physico-chemical analysis. A change in Brønsted acidity can affect to the catalytic efficiency; therefore, the thermal degradation behavior of the WO3-TiO2 catalyst could be explained by the transition to a stable rutile phase of TiO2 and the decrease of specific surface area in the SCR catalyst.
척추측만증 검진을 위한 모아레 체형측정법과 설문조사의 상관성 연구
유한길,김혜정,신병철,Yoo, Han-Keel,Kim, Hae-Jung,Shin, Byung-Cheul 척추신경추나의학회 2003 대한추나의학회지 Vol.4 No.1
Objectives : The purpose of this study is researching for correlation between Moire topography results and questionnaire which include obesity rate, height, weight, posture, pain aspect (low back pain, headache, fatigue, neck pain etc), studying posture, school attendance method, menarche. Methods : The authors practiced Moire topography and questionnaire for primary & middle school 24,419 students [male 12,843, female 11,576] in Jeonbuk, korea in 2002. After we distinguished students who had abnormal finding in Moire topography and statistically analysed the data. Results : According to this research, the abnormal finding in Moire topography results was 37.3% (9,105 students), and students needed X-ray re-examination were 3.9% (953 students). According to statistical analysis, male/female and primary/middle school students have no difference in deformity degree of the body surface examined by Moire. Height and weight have low correlation with deformity degree of the body surface examined by Moire and menarche, pain aspect have no correlation. But, school attendance method by bicycle and $90^{\circ}$upright sitting in study posture is the best way to decrease the deformity degree of the body surface examined by Moire. Conclusions : Following this research, throughout Moire topography could detect trunk asymmetry that couldn't be found existing X-ray examination, and school attendance by bicycle and $90^{\circ}$upright sitting in study posture is good for school students to prevent back deformity.