• Effect of Reaction Conditions on the Size and Size Distribution of Magnetite Nanoparticles Coated with Siloxane
  • Yoon KH, Han CM, Chang YM
  • 반응조건에 따른 실록산으로 코팅된 마그네타이트 나노입자의 크기 및 분포
  • 윤관한, 한창민, 장용민
Abstract
The effect of reaction conditions on the size and size distribution of superparamagnetic iron oxide coated with siloxane was big investigated by using dynamic light scattering. The hydrogen bond between the hydroxyl groups on the surface of the magnetite and silanol was confirmed by FT-IR. The size of nanoparticles increased with the reaction temperature, but decreased with monomer contents and agitation speeds. There was not a big difference in size of nanoparticles, prepared by different reaction conditions, but its distribution was in the range of 14 ~ 41 nm. All samples exhibited the superparamagnetic nature. The magnetic susceptibility of the nanoparticles increased with the reaction temperature while it decreased with the monomer content and agitation speed.

반응조건에 따른 실록산으로 코팅된 마그네타이트 나노입자의 크기 및 분포를 동적광산란을 이용하여 조사하였다. FT-IR로부터 마그네타이트의 표면에 히드록시기가 존재함을 확인하였고 이 히드록시기는 코팅된 실록산의 실란올과 수소결합을 이루고 있음이 확인되었다. 제조된 나노입자의 크기는 반응온도가 증가함에 따라 입자크기는 증가하였고 단량체 함량과 교반속도의 증가에 따라서는 감소하였다. 입자 크기 분포는 반응조건에 따라서 약간의 변화는 있지만 전체적으로 14 ~ 41 nm 크기의 범위를 나타냈다. 제조된 마그네타이트의 자성특성은 vibrating sample magnetometer를 이용하여 초상자성임이 확인되었고 실록산으로 코팅된 나노입자 역시 초상자성을 나타냄을 확인하였다. 반응조건에 따라서는 반응온도가 증가할수록 포화자화강도는 증가하였고 단량체 함량과 교반속도가 증가함에 따라서 포화자화강도가 감소하는 것을 나타내었다.

Keywords: contrast agent; siloxane; superparamagnetic iron oxide; size and size distribution

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This Article

  • 2004; 28(2): 170-176

    Published online Mar 25, 2004

  • Received on Jun 5, 2003
  • Accepted on Mar 17, 2004