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한국결정성장학회지 = Journal of the Korean crystal growth and crystal technology, v.28 no.3, 2018년, pp.118 - 122
옥지영 (창원대학교 신소재공학과) , 손정훈 (창원대학교 신소재공학과) , 배동식 (창원대학교 신소재공학과)
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| 핵심어 | 질문 | 논문에서 추출한 답변 |
|---|---|---|
| Cerium oxide는 어떤 분야에 응용되어 사용되는가? | Cerium oxide는 특유의 물리, 화학적 성질에 의해 고체산화물 연료전지(SOFC), 산소가스센서, 자외선 흡수제(UV absorbent), 연마제 등 매우 광범위한 분야로 응용되어 사용된다[1-9]. 세리아는 주위의 산소 농도에 따라 산화/환원 작용을 하며 우수한 산소 저장 능력을 가지고 있으며, 특히 자동차의 배기 가스를 분해하여 무독성의 가스로 변환하는 촉매로써 널리 응용되고 있다[10-12]. | |
| 세리아 나노 입자를 합성하는 방법에는 무엇이 있는가? | 그러나, 입자의 크기가 작아지면 입자들끼리 강한 응집 작용이 일어나므로 높은 비표면적을 얻기는 쉽지 않다[20]. 세리아 나노 입자를 합성하는 방법은 침전법, 졸겔법, 마이크로 에멀젼법, 용매열 공정 등 다양한 공정이 있다[21-29]. 침전법과 졸겔법은 높은 결정성을 가지는 분말을 만들기 위해 추가적인 고온 반응 공정을 필요로 한다. | |
| 침전법과 졸겔법은 높은 결정성을 가지는 분말을 만들기 위해 추가적인 고온 반응 공정을 필요로 하는데, 이 과정에서 어떤 문제가 생기는가? | 침전법과 졸겔법은 높은 결정성을 가지는 분말을 만들기 위해 추가적인 고온 반응 공정을 필요로 한다. 이 과정에서 입자들은 표면 에너지를 낮추기 위해 응집이 되며, 불규칙한 모양을 형성한다[30, 31]. 이를 제어하기 위해 계면활성제를 첨가하며, 계면활성제를 제거하기 위한 공정을 필요로 한다[14]. |
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