• Title/Summary/Keyword: 자성산화철

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Synthesis of Magnetic Polystyrene-Polyimide Core-Shell Microsphere (자성 폴리스티렌-폴리이미드 Core-Shell 마이크로스피어의 합성)

  • Ahn, Byung-Hyun
    • Elastomers and Composites
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    • v.47 no.2
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    • pp.168-173
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    • 2012
  • Polystyrene-polyimide core-shell microsphere was prepared by dispersion polymerization using poly(amic acid) as the stabilizer. Iron oxide was formed at the microsphere by thermal decomposition of iron pentacarbonyl impregnated in the microsphere. The magnetic polystyrene-polyimide microsphere was monodisperse and the size was about 500 nm. The magnetic polystyrene-polyimide microsphere had 40% of iron oxide, which was identified as $Fe_3O_4$ by X-ray diffraction.

Synthesis of Monodispersed Magnetic Polymer Particle (균일한 자성 고분자 입자의 합성)

  • Ahn, Byung Hyun
    • Applied Chemistry for Engineering
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    • v.19 no.3
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    • pp.316-321
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    • 2008
  • Monodispersed particles of poly(styrene-co-4-vinylpyridine), poly(st-co-4vp) were prepared by soapless emulsion polymerization. Iron oxide was formed on the surface and inside of the poly(st-co-4vp) particles by thermal decompostion of iron pentacarbonyl. The obtained magnetic poly(st-co-4vp) particles was mondispersed and the average size was 250 nm. The magnetic poly(st-co-4vp) particles had 14% of iron oxide, which was identified as $Fe_3O_4$ by XRD. The magnetic poly(st-co-4vp) particles had superparamagnetism according to superconducting susceptometer (SQUID).

Preparation of Water-based Magnetic Fluids with Spent Iron Oxide Catalyst (산화철 폐촉매로부터 수상 자성유체 제조방법)

  • Lee, Hyo-Sook;Shao, Hui-Ping;Kim, Chong-Oh
    • Journal of the Korean Magnetics Society
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    • v.15 no.1
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    • pp.37-41
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    • 2005
  • We prepared water-based magnetic fluids with the spent iron oxide catalysts which were used in the styrene monomer production process. The catalyst was composed with 70% magnetite and alkali metals. The water-based magnetic fluids were prepared by mechanical grinding with olecic acid as a surfactant and water in an attritor. The magnetization of the water-based magnetic fluids was 22 emu/g in the 10 kOe.

Development of DNA Sensor Using Magnetic Iron Oxide Nanoparticle (자성 산화철(iron oxide) 나노입자를 이용한 DNA 센서 개발)

  • Nam, Ki-Chang;Song, Kwang-Soup
    • Journal of the Institute of Electronics Engineers of Korea SC
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    • v.48 no.6
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    • pp.51-56
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    • 2011
  • The surface of magnetic iron oxide nanoparticles (${\gamma}-Fe_2O_3$) is functionalized ($-NH_2$, -COOH) with bifunctional organic molecules and evaluated using FT-IR (Fourier transform infrared spectroscopy). We immobilize 21-base pair probe DNA and hybridize fluorescence-labeled (Cy5) target DNA onto the functionalized iron oxide nanoparticles. The fluorescence images obtained from a confocal microscopy show that the functionalized iron oxide nanoparticles should detect the hybridization of complementary and noncomplementary DNA.

The Development of Theoretical Model for Relaxation Mechanism of Sup erparamagnetic Nano Particles (초상자성 나노 입자의 자기이완 특성에 관한 이론적 연구)

  • 장용민;황문정
    • Investigative Magnetic Resonance Imaging
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    • v.7 no.1
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    • pp.39-46
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    • 2003
  • Purpose : To develop a theoretical model for magnetic relaxation behavior of the superparamagnetic nano-particle agent, which demonstrates multi-functionality such as liver- and lymp node-specificity. Based on the developed model, the computer simulation was performed to clarify the relationship between relaxation time and the applied magnetic field strength. Materials and Methods : The ultrasmall superparamagnetic iron oxide (USPIO) was encapsulated with biocompatiable polymer, to develop a relaxation model based on outsphere mechanism, which was resulting from diffusion and/or electron spin fluctuation. In addition, Brillouin function was introduced to describe the full magnetization by considering the fact that the low-field approximation, which was adapted in paramagnetic case, is no longer valid. The developed model describes therefore the T1 and T2 relaxation behavior of superparamagnetic iron oxide both in low-field and in high-field. Based on our model, the computer simulation was performed to test the relaxation behavior of superparamagnetic contrast agent over various magnetic fields using MathCad (MathCad, U.S.A.), a symbolic computation software. Results : For T1 and T2 magnetic relaxation characteristics of ultrasmall superparamagnetic iron oxide, the theoretical model showed that at low field (<1.0 Mhz), $\tau_{S1}(\tau_{S2}$, in case of T2), which is a correlation time in spectral density function, plays a major role. This suggests that realignment of nano-magnetic particles is most important at low magnetic field. On the other hand, at high field, $\tau$, which is another correlation time in spectral density function, plays a major role. Since $\tau$ is closely related to particle size, this suggests that the difference in R1 and R2 over particle sizes, at high field, is resulting not from the realignment of particles but from the particle size itself. Within normal body temperature region, the temperature dependence of T1 and T2 relaxation time showed that there is no change in T1 and T2 relaxation times at high field. Especially, T1 showed less temperature dependence compared to T2. Conclusion : We developed a theoretical model of r magnetic relaxation behavior of ultrasmall superparamagnetic iron oxide (USPIO), which was reported to show clinical multi-functionality by utilizing physical properties of nano-magnetic particle. In addition, based on the developed model, the computer simulation was performed to investigate the relationship between relaxation time of USPIO and the applied magnetic field strength.

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양극산화 자성피막을 이용한 수직자기기록매체

  • 강희우
    • 전기의세계
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    • v.42 no.9
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    • pp.20-27
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    • 1993
  • 1. 철근출막은 결정자기이방성의 영향이 작기 때문에, 자기특성이 막의 기하학적구조에 의해 거의 결정되고 그것에 의하여 자성막의 설계가 가능하다. 2. 코발트 근출막은 결정자기이방성이 자기특성에 영향은 크기때문에 코발트 결정의 자화용역축(C축)의 배향에 의하여 자기특성은 크게 변한다. 따라서 이 C축의 배향성을 변화시켜 석출입자의 형태를 바꾸지 않고 작은 포아직경에서도 항자력의 제어가 가능하였다. 3. 코발트-철합금신출막은 조성변화에 의하여 자기특성을 제어할 수 있다. 또 ㅈ포화자화, 항자력도 철을 석출한 자성막에 비해서 높은 값을 나타냄을 물론, 우수한 각형화(Mr/Ms)로 얻어지는 큰 자기에너지적으로 수직 자기기록방식의 고정밀의 로타리 엔코다에의 응용이 유망하다.

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The Multi-Frequency NMR Relaxation and EPR Study of Nano-sized Iron Oxide

  • 황문정;이영주;이일수;장용민
    • Proceedings of the KSMRM Conference
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    • 2002.11a
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    • pp.129-129
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    • 2002
  • 목적: 초상자성 nano 산화철 입자의 특성을 연구하기 위하여, 여러 다른 자기장 세기에서의 NMR 자기공이완시간(T1/T2)을 측정하고, 초상자성 nano-particle 조영제의 기전에 관한 모델로부터 얻어 진 계산식과 비교해보며, 다양한 온도에서의 EPR spectrum을 이용하여 이들의 전자적 성질을 비교해 보고자 하였다.

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Sorptive Removal of Radionuclides (Cobalt, Strontium and Cesium) using AMP/IO-PAN Composites (AMP/IO-PAN 복합체를 이용한 방사성 핵종(코발트, 스트론튬, 세슘)의 흡착 제거)

  • Park, Younjin;Kim, Chorong;Shin, Won Sik;Choi, Sang-June
    • Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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    • v.11 no.4
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    • pp.259-269
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    • 2013
  • Applicability of ammonium molybdophosphate/iron oxides-polyacrylonitrile (AMP/IO-PAN) composites on the removal of radionuclides in the radioactive wastewater generated from nuclear power plants was investigated. The composites were characterized using the following analytical techniques: X-ray diffraction (XRD), Fourior transform-infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM), particle size analyzer (PSA), nitrogen adsorption-desorption and magnetic property measurement system (MPMS). 10wt% of AMP/IO-PAN composite has a saturation magnetization of 2.038 emu/g. Single-solute sorptions of Co, Sr and Cs onto 10wt% of AMP/IO-PAN composite were investigated. The maximum sorption capacities ($Q^0$) predicted by the Langmuir model on 10wt% of AMP/IO-PAN composite were 0.097, 0.086 and 0.66 mmol/g for Co, Sr and Cs, respectively. The maximum sorption capacities ($Q^0$) of Cs predicted by Langmuir model on 0, 10, 20 and 30wt% of AMP/IO-PAN composites were 0.702, 0.655, 0.602 and 0.559 mmol/g, respectively. The maximum sorption capacities ($Q^0$) of Cs decreased with increasing the iron oxide content in the AMP/IO-PAN composites.

The Effects of Bottom Extremity on the Magnetic Properties of Iron and Cobalt-Iron Electrodeposited Anodic Oxided Films. (철 및 코발트-철합금석출 양극산화피막의 초기석출부가 자기특성에 미치는 영향)

  • ;Ken-Ichi Arai
    • Journal of the Korean Magnetics Society
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    • v.5 no.6
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    • pp.921-927
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    • 1995
  • The micro particle,s shapes of the magnetic films obtained by electrode position of Iron ions and Cobalt-Iron mixed ions in aluminum anodic oxidized films are dependent on the size of particle diameter. When the diameter of deposited particles is larger than $300\AA$, the film plane anisotropy caused by bottom extremity increases, and the crystalization orientation of FeC deposited unusually in the part of the bottom extremities affects on the coercive force Hc and the magnetic anisotropy energy Ku. It was confirmed that the shape anisotropy of particle affects on the both Hc and Ku because the FeC did not deposit in the Iron deposited samples entirely, but in the Cobalt-Iron alloy deposited samples, the effects by the very strong crystalization orientation of the FeC is larger than that of the shape anisotropy. From these results, the Cobalt-Iron alloyed films could switchover the film plane magnetic anisotropy to the perpendicular magnetic anisotropy energy by using the constrainting method of FeC deposition with Cu deposition instead of Cobalt-Iron alloy in the bottom extremities.

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A Study on the removal of Ozone by using Natural Manganese Ore as a catalyst (천연망간광석 촉매를 이용한 오존 제거에 관한 연구)

  • 정규철;이준엽;박태성;홍성창
    • Proceedings of the Korea Air Pollution Research Association Conference
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    • 2002.04a
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    • pp.291-292
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    • 2002
  • 일반적으로 오존(O$_3$)은 친전자성 및 친핵성반응 때문에 탄소-탄소 이중결합을 가진 분자들을 떼어놓을 수 있는 매우 강한 산화능력을 갖고 있는 것으로서 살균, 맛과 냄새의 조절, 색도 제거 등에 이용되어왔다. 그러나, 오존은 대기 중에 미반응상태로 잔류하는 경우에는 광화학 스모그를 발생시키는 주된 요인이 되고 있으며, 강력한 산화력을 지니고 있기 때문에 0.1-l ppm의 범위에서 인체에 노출되면 두통, 목 건조증, 점막손상과 같은 호흡기 질환 등의 원인이 될 뿐만 아니라 악취를 유발하여 불쾌감을 야기한다. (중략)

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