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NTIS 바로가기공업화학 = Applied chemistry for engineering, v.31 no.3, 2020년, pp.299 - 304
박영주 (금오공과대학교 화학공학과) , 장지웅 (금오공과대학교 화학공학과)
Nanoparticles play an important role as a catalyst in many chemical syntheses. Colloidal nanoparticles were usually synthesized with reducing, capping, and shape directing agents which induce surface poisoning of catalysts. A new green synthesis for silver nanoparticles was developed by utilizing le...
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핵심어 | 질문 | 논문에서 추출한 답변 |
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금속 나노입자의 특징은 무엇인가? | 금속 나노입자는 양자 사이즈 효과, 광학적 특성 및 전자 특성 때문에 광학, 광전자 공학, 촉매, 나노 구조 제조 및 화학⋅생화학 센서 등의 영역에서 오랫동안 광범위하게 연구되었다[1-9]. 특히 금속 나노입자는 Fermi potential이 높기 때문에 활성이 높은 촉매로 쓰일 수 있다[10]. | |
Colloidal synthesis의 장점은 무엇인가? | 촉매로 이용하는 금속 나노입자의 크기와 형상을 제어하기 위해서 colloidal synthesis, 예를 들어 polyol method를 많이 사용하고 있다[20,21]. Colloidal synthesis는 다른 합성법에 비해 환원제, capping agent, shape directing agent 등의 양을 쉽게 조절할 수 있는 장점과 나노입자 합성 속도와 수율이 높은 장점이 있다[22-24]. 하지만 이렇게 합성된 나노입자의 표면은 capping agent, shape directing agent 등이 흡착되어 있다. | |
colloidal synthesis로 surface poisoning이 거의 없는 나노입자의 합성이 어려운 이유는 무엇인가? | 따라서 나노입자 표면의 active site에 합성에 사용된 capping agent와 shape directing agent가 surface poisoning을 일으켜 촉매로 이용할 경우 촉매의 특성이 낮아질 수 있다. Capping agent가 없는 나노입자는 높은 표면장력으로 가지므로 표면적을 줄이기 위해 응집해 큰 입자를 형성한다[25-28]. 따라서 colloidal synthesis로는 surface poisoning이 거의 없는 나노입자 합성하기 어렵다. |
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