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표은지 ( Eunji Pyo ),김영용 ( Youngyong Kim ),권기영 ( Ki-young Kwon ) 한국공업화학회 2016 공업화학 Vol.27 No.6
본 연구에서는 수열합성법을 이용하여 수산화인회석을 합성하였다. 또한 이온 교환 반응을 통하여 수산화인회석 표면에 은을 도입하였다. 합성된 샘플의 결정성과 형태를 X-선 회절 분석과 투과전자현미경을 통하여 분석하였으며, 산란반사 UV-vis 스펙트럼을 통하여 합성한 샘플의 광학적 특성을 조사하였다. 은이 도핑된 수산화인회석의 경우 은이 수산화인회석 표면에 나노입자 형태로 존재한다는 것을 X-선 회절 분석과 투과전자현미경 실험으로 확인하였다. 특히 수산화인회석과 비교하여 은 나노 입자가 도입된 수산화인회석의 경우에는 UV-Vis 영역에서 높은 흡광도를 나타내었다. Hydroxyapatite (HAP) was prepared by a hydrothermal synthesis method and also silver was introduced on the surface of HAP through an ion exchange reaction. The crystal phase and morphology of HAP were then evaluated by X-ray diffraction (XRD) and transmission electron microscopy (TEM). In addition, the absorption property of HAP was characterized by diffuse reflectance UV-Vis spectroscopy. The presence of silver nanoparticles on the surface of HAP was also verified by XRD and TEM analysis. Particularly, the silver doped HAP showed an enhanced absorption property in UV-Vis region compared to that of the pristine HAP.
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오일 양이 최소화된 물/오일 에멀젼을 통한 구형 마이크로 크기 실리카 합성
표은지 ( Eunji Pyo ),차연아 ( Yeona Cha ),강동균 ( Donggyun Kang ),권기영 ( Ki-young Kwon ) 한국공업화학회 2020 공업화학 Vol.31 No.6
W/O 에멀젼을 통해 구형의 실리카를 합성하는데 있어서 오일의 양을 최소화하는 연구를 수행하였다. 물유리 283 g에 오일로서 헥산을 최소한으로 20~60 mL 사용하여 구형의 실리카가 합성됨을 확인하였다. 실리카의 크기는 오일의 양에 의존하였으며, 오일의 양이 증가함에 따라서 실리카 입자의 크기가 증가하는 것을 확인하였다. 합성된 구형 실리카의 비표면적을 BET법을 통해 측정해본 결과 186~230 m<sup>2</sup>/g 값임을 확인하였다. XRF 분석으로부터 90% 이상이 SiO<sub>2</sub>임을 확인하였으며, 물유리 사용으로 인한 나트륨이 3.27~4.5 wt. %의 불순물로 함유되어 있었다. 본 연구에서 제조한구형의 실리카는 Si의 전구체를 공업용 규산나트륨 용액을 사용함과 더불어 최소한의 헥산과 비이온계면활성제를 통하여 만들어졌기 때문에 대량 합성 및 상업화에 최적화되어 있는 조건이라고 판단된다. We prepared spherical silica by minimizing the amount of oil through water/oil (W/O) emulsion. The spherical silica was successfully synthesized by using 20 to 60 mL of hexane as an oil for 283 g of water glass. The size of silica was dependent on the amount of oil where the size of silica particles increased as the amount of oil increased. The specific surface areas of samples measured using the BET method were 186 to 230 m<sup>2</sup>/g. X-ray fluorescence (XRF) analysis results showed that the SiO<sub>2</sub> content was more than 90% while sodium was 3.27~4.5 wt. %. The spherical silica prepared in this study could be optimized for mass synthesis and commercialization because the industrial sodium silicate solution was used as a precursor of Si as well as the minimum amounts of hexane and nonionic surfactant were employed.
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중소도시 주부들의 과일 소비실태 및 수입과일에 대한 인식
장태희(Jang, Taehui),백지선(Baek, Jiseon),이선민(Lee, Seonmin),표은지(Pyo, Eunji),현태선(Hyun, Taisun) 충북대학교 생활과학연구소 2019 생활과학연구논총 Vol.23 No.3
The purpose of this study was to examine purchasing behavior and consumption frequency of fruits, and perception of imported fruits among housewives living in small cities. A questionnaire survey was conducted to 265 housewives living in Cheongju, Suwon and Pohang from May to June in 2015. The place to buy fruits were fruit shop (30.9%), large discount store (25.3%), nearby supermarket (17.7%), and traditional markets (16.6%). When purchasing fruits, 34.3% answered they always checked their country of origin, 34.7 % answered ‘sometimes’, and 25.7% seldom checked, and 5.3% never checked. While 53.6% preferred domestic fruits, 46.4% preferred imported fruits or they do not care about the country of origin. These purchasing behaviors of fruits were significant different according to age. More than 90% had experience in purchasing imported fruits. Fruit consumption frequencies were higher in the group aged 50 or older than the group aged less than 40. Apple and tangerine were the most frequently consumed domestic fruits, and banana and orange were the most frequently consumed imported fruits. The most important factors for choosing fruits were taste, freshness, safety, price, nutrition in the order. They perceived imported fruits as tasty and having different types and flavor, but negatively perceived in terms of freshness, safety and hygiene. While the housewives thought that taste, freshness, and safety were the most important factors for choosing fruits, they do not think imported fruits were fresh, safe, and hygienic.
ScienceON
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