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Properties and characterization of sodium silicate based silica aerogel film at ambient pressure
전순정,박성수,( Shao Godlisten Namwel ),김희택 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1
Recently, there have been considerable investigations to improve the dielectric constant of silica semiconductor. However, most of reports tetraethylorthosilicate or tetramethylorthosilicate are mainly used as SiO<sub>2</sub> precursors which are undoubtedly expensive and hazardous. Meanwhile, using hydrogen plasma treatment desired properties such as a stable low dielectric constant for silica aerogel films can be attained. In the present study the effect of hydrogen plasma treatment on the properties of silica aerogel film obtained at ambient pressure using less expensive silica precursor (sodium silicate) was studied. The aerogels were characterized by FTIR and SEM analyses in order to determine the structure and morphology of the films. The possibility of producing silica aerogel films with appreciable properties from less expensive source will promote large scale production of dielectric materials for various applications.
Synthesis of mesoporous titania-silica composite from rice husk and their photocatalytic properties
전순정,( Godlisten N. Shao ),박성수,반가람,김희택 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
Mesoporous titania-silica composite was prepared by a facile sol-gel process using cost-effective precursors at low temperature. Silica source was the rice husk, which is an agricultural waste and rich in silica. Rice husk are an excellent source of high-grade amorphous silica. Utilization of rice husk as a resource of silica is based on removal of impurities with low effort and the high specific surface. Silica was extracted fromash as sodium silicate by boiling it in sodium hydroxide solution. The extracted silica source was reacted with Titania sol yielded from titanium oxychloride to form titania-silica composite. The structure of the composite was characterized by FE-SEM, EDAX, TEM, XRD, UV-vis DRS, FTIR and nitrogen gas physisorption studies. These analyses showed that mesoporous titania-silica composites with desirable properties for photocatalysis can be obtained via this facile process.
친환경 타이어 충진제 적용을 위한 SiO2-ZnO 복합체 합성 및 특성평가
전순정 ( Sun Jeong Jeon ),송시내 ( Si Nae Song ),강신재 ( Shin Jae Kang ),김희택 ( Hee Taik Kim ) 한국화학공학회 2015 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.53 No.3
타이어 라벨링제 도입으로 인한 친환경 타이어 개발의 요구로 타이어산업에서 사용되고 있는 기존 산화아연의 문제 점 개선을 위하여 나노산화아연과 나노기공 실리카와의 복합체 합성에 대한 연구를 진행하였다. 본 연구에서는 타이 어의 트레드(tread) 부분에 적용될 기존의 고무 보강재인 카본블랙을 대체하기 위한 실리카와 나노산화아연의 복합체를 합성하기 위하여, 일정량의 나노기공 실리카를 함유하고 재질 상으로는 나노기공 실리카와 산화아연을 물리적 결합을 통하여 hysteresis 손상을 줄이면서 트레드의 탄성을 증대시키기 위해 내마모성능의 향상을 목표로 실험을 진행하였다. 이를 위하여 복합체와 고무 조성물과의 컴파운딩 시 낮은 활성도와 분산안정성 저하의 문제점 개선하고자 숙성시간 (Aging time)과 몰 비 그리고 반응물의 반응 순서에 따라 미치는 영향에 대해 조사하였다. 0.03몰 비의 산화아연과 숙 성기간 10일의 조건의 실리카에서 가장 작은 평균입도(약 50.5 nm)와 안정적인 분산성을 보였고, 약 649 m2/g의 높은 비표면적을 나타내었다. The development of the environment-friendly tire that meets the standard requirements according to tire labeling system can be improved through using highly homogeneous silica immobilized zinc oxide nanoparticles. In this study, a considerable amount of nanoporous silica was essentially added into nano zinc oxide to improve the physiochemical properties of the formed composite. The introduction of nanoporous silica materials in the composite facilitates the improvement of the wear-resistance and increases the elasticity of the tread. Therefore, the introduction of nanoporous silica can replace carbon black as filler in the formation of composites with desirable properties for conventional green tire. Herein, mesoporous silica immobilized zinc oxide nanoparticle with desirable properties for rubber compounds was investigated. Composites with homogeneous dispersion were obtained in the absence of dispersants. The dispersion stability was controlled through varying the molar ratio, ageing time and mixing order of the reactants. A superior dispersion was achieved in the sample obtained using 0.03 mol of zinc precursor as it had the smallest grain size (50.5 nm) and then immobilized in silica aged for 10 days. Moreover, the specific surface area of this sample was the highest (649 m2/g).
IB MYP 교육 프로그램과 공교육의 만남에 대한 사례 연구
전순정(Soon Jeong Jeon) 한국교육과정개발원 2024 한국교육과정개발연구 Vol.2 No.2
교육생태계가 급변하고 있는 현 시점에서 학교현장에서의 미래교육의 의미와 목적에 대한 탐색이 무엇보다 필요하며, 이를 실현하기 위한 논의 또한 다각도로 이루어져야 하는 상황이다. 이러한 실현 방안의 하나로 IB 교육과정이 국내에 도입, 공교육에서 실행되고 있으나, 기대와 우려가 공존하고 있는 것이 현실이다. 이러한 기대와 우려에 대해 논하기 위해 IB MYP 인증학교의 수업-평가 사례(언어와 문학)를 살펴보고, 교육과정 운영의 틀로서 교수-학습에 미치는 영향과 학습자와 교사의 교육 경험에 대해 논의하고자 한다. 또한 이를 근거로 IB MYP와 국가수준 교육과정 결합의 적합성과 타당성, 운영의 방향성에 대해 탐색해 볼 것이다. At a time when the educational ecosystem is rapidly changing, exploration of the meaning and purpose of future education in schools is more necessary, and discussions to realize this must also take place from various angles. As one of these realization measures, the IB curriculum has been introduced in Korea and implemented in public education, but the reality is that expectations and concerns coexist. To discuss these expectations and concerns, we look at teaching-assessment cases (language and literature) at IB MYP-certified schools, As a framework for curriculum operation, we would like to discuss the impact on teaching and learning and the educational experience of learners and teachers. Additionally, based on this, we will explore the suitability, feasibility, and direction of operation of combining the IB MYP with the national level curriculum.