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영구자석 스크랩으로 합성한 산화철 나노입자의 물성에 미치는 열처리 온도의 영향
홍성제,홍상혁,조아진,김용성,김병준,양수원,이재용,Hong, Sung-Jei,Hong, Sang Hyeok,Jo, Ajin,Kim, Young-Sung,Kim, ByeongJun,Yang, Suwon,Lee, Jae-Yong 한국청정기술학회 2022 청정기술 Vol.28 No.2
In this study, iron oxide (FeO<sub>x</sub>) nanoparticles were synthesized using iron (Fe) by-products recovered from NdFeB permanent magnet scraps, and the effect of heat-treatment temperature on the physical properties of the FeO<sub>x</sub> nanoparticles was investigated. In order to prepare the FeO<sub>x</sub> nanoparticles, 2.0 M ammonia (NH<sub>4</sub>OH) solution was added to an iron by-product solution diluted to c.a. 10 wt% in D.I. water, which led to the precipitation of the iron oxide precursor. Then, the FeO<sub>x</sub> nanoparticles were synthesized by heat-treatment at 300 ℃, 400 ℃, 500 ℃ and 600 ℃. After that, the physical properties of the FeO<sub>x</sub> nanoparticles were investigated in order to understand the effect of the heat-treatment temperature. The results of the X-ray diffraction (XRD) analysis showed that the diffraction peak in accordance with the <104> direction increased as the heat-treatment increased, and a diffraction peak indicating the α-Fe<sub>2</sub>O<sub>3</sub> crystal structure was detected at heat-treatment temperatures above 500 ℃. The BET specific surface area analysis revealed that the specific surface area decreased as the heat-treatment temperature increased to above 400 ℃. Observation with a high resolution transmission electron microscope (HRTEM) showed that rod-shaped nanoparticles were formed, and the size of the nanoparticles showed a tendency to increase as the heat-treatment temperature increased.
커피전문점에 대한 물리적 환경, 점포에 대한 감성, 만족에 관한 연구: 20·30대를 중심으로
이연우 ( Yeonu Lee ),김예니 ( Yeni Kim ),조아진 ( Ajin Jo ) 관광경영학회 2019 관광경영연구 Vol.87 No.-
The purpose of this study was to establish the physical environment which is suitable for coffee shops and examine how physical environment impacts on stores' emotions as a result how the stores' emotions influence on customers' satisfaction. This study used a multi-regression analysis to understand those relationship with focused on the age group of twenties and thirties. The results of this study proved that the factor of 'amusement·attractiveness', 'cleanliness·comfort' and 'environment' had a positive influence on 'customers' satisfaction' otherwise 'aesthetics', 'spaces', and 'convenience' did not statistically influence on 'stores' emotions'. Also the 'stores' emotions' was positively influenced on 'customers' satisfaction' in using coffee shops. This study found that what factors were considered as important in selecting coffee shops in terms of customers and the more customers have positive emotions the more the customers feel higher satisfaction. Therefore managers who operate coffee shops should be considered the element of emotional management to attract more customers for their business.