Two-Dimensional Monte Carlo Simulations of a Colloidal Dispersion Composed of Polydisperse Ferromagnetic Particles in an Applied Magnetic Field

Aoshima, Masayuki; Watanabe, Tomonori; Satoh, Akira

doi:10.1252/kakoronbunshu.30.771

Cited by 5 publications

(6 citation statements)

References 14 publications

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“…The creation of these formations caused by magnetic field very well correlated also with numerical simulations (Aoshima and Satoh, 2005;Diblik and Kudelcikova, 2011;Satoh et al, 2000;Taixiang et al, 2014). Part of long chains or clusters contains several nanoparticles and can be characterized by diameter and constant of recovering force.…”

Section: Resultssupporting

confidence: 77%

“…From the presented results as well as from our previous works (Kudelcik et al, 2012(Kudelcik et al, , 2013a(Kudelcik et al, , 2013b(Kudelcik et al, , 2014a, we can suppose that magnetic nanoparticles in magnetic field are arranged in long chains or can create clusters. The creation of these formations caused by magnetic field very well correlated also with numerical simulations (Aoshima and Satoh, 2005;Diblik and Kudelcikova, 2011;Satoh et al, 2000;Taixiang et al, 2014). Part of long chains or clusters contains several nanoparticles and can be characterized by diameter and constant of recovering force.…”

Section: Resultssupporting

confidence: 77%

“…These shapes depend on both particle-particle interactions represented by the coupling constant and particle-field interactions. There are also computer simulations (Aoshima and Satoh, 2005;Koltunowicz et al, 2013;Satoh et al, 2000;Taixiang et al, 2014) that investigated aggregation phenomena in a polydisperse colloidal dispersion of ferromagnetic nanoparticles, and their simulations confirmed creation of various types of chains for various conditions.…”

Section: Introductionmentioning

confidence: 98%

See 2 more Smart Citations

Acoustic spectroscopy of magnetic fluids based on transformer oil

Kúdelčík

Hardoň

Bury

et al. 2015

Journal of Intelligent Material Systems and Structures

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The structural changes in transformer oil-based magnetic fluids with magnetite nanoparticles, FeOÁFe 2 O 3 , of different diameters upon the effect of an external magnetic field were studied by acoustic spectroscopy. The corresponding changes of the acoustic wave attenuation as a function of magnetic field were measured. Over the linear increasing magnetic field, the interaction between the magnetic field and the magnetic moments of the nanoparticles led to the aggregation of magnetic nanoparticles and following chain or cluster formation. These structures enlarged with the magnetic field and this process had the influence on the value of the acoustic attenuation. The remarkable changes in the acoustic attenuation were also observed in the magnetic fluid subjected to a jumped magnetic field observed for a given time. After the back change of magnetic field to zero, the attenuation drastically decreases because the lifetime of big clusters is in this case small. The anisotropy of the acoustic attenuation in external magnetic field was measured and analyzed at various temperatures, and the cluster radius, the number density of the colloidal nanoparticles, and some other parameters of magnetic nanoparticles could be determined from experimental results.

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Section: Resultssupporting

confidence: 77%

Section: Resultssupporting

confidence: 77%

Section: Introductionmentioning

confidence: 98%

See 1 more Smart Citation

Acoustic spectroscopy of magnetic fluids based on transformer oil

Kúdelčík

Hardoň

Bury

et al. 2015

Journal of Intelligent Material Systems and Structures

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“…記録材料 (Verdes et al, 2006)の分野への応用に加え，近年では医用工学 (Häfeli et al, 1997)や環境資源工学 (Girginova et al, 2010)の分野への応用展開が活発になされるに至っている．医用工学や環境資源工学の分野では，目的に合わせた高次機能性磁性粒子の創製やその凝集構造や運動の制御法の構築が主な研究課題となっている．医用工学分野での応用に際しては，薬剤を包含した機能性粒子をガン・腫瘍部への誘導のための drug delivery システムの構築 (Shapiro, 2009) ，磁気モーメントの緩和現象に基づいた磁気温熱効果の制御法の構築 (Rosensweig, 2002, Obaidat et al, 2015)などがある．環境資源工学での応用に際しては，物質の吸着現象の解明と磁場勾配による回収技術の構築 (Konicki et al, 2017)などが必要となる．磁性粒子や非磁性粒子の高次機能化を計るには，物質の表面改質技術が必要となる．物質の表面改質に関する研究は非常に数多くなされているが，ここでは物理的な観点から，表面改質技術の磁性粒子への応用に関係する研究について簡単に言及する．磁性球状粒子を対象とした研究として，2 次元平面上での凝集形態や相転移現象の解明と印加磁場の影響を検討した研究 (Duncan and Camp, 2004, Dempster et al, 2015, Pham et al, 2017, Theis-Bröhl et al, 2015などがある．このような物質表面での磁性粒子の凝集構造・相転移・配向特性に関する研究は，球状粒子から，軸対称粒子の代表的な形状である棒状粒子 (Gil-Villegas et al, 1997, Domingos et al, 2017, Aoshima and Satoh, 2005や扁平粒子 (Satoh and Sakuda, 2010)に範囲を広げて，活発に遂行されてきている．さらに最近では，キューブ状磁性粒子を対象に，磁場の強さの変化に対する凝集構造の相転移の研究もされている (Satoh andOkada, 2017, Okada andSatoh, 2018) ．キューブ状ヘマタイト粒子の場合には，対角線に近い方向で磁化されていると考えられる (Rossi et al, 2011, Meijer et al, 2012) ．キューブ状磁性粒子の物質表面上の単層の凝集構造の研究により，ある条件下では面接触による凝集体を形成する傾向が非常に強いことがわかっている (Rossi et al, 2011, Meijer et al, 2012, Linse, 2015, Donaldson and Kantorovich, 2015, Satoh and Okada, 2017 ．上述の研究例でもわかるように，物質表面上での磁性粒子の凝集形態や内部構造を制御するためには，外部磁場を効果的に活用する方法が有効である．さらに一歩進めて，磁性粒子を帯電させ，電場と磁場により，より高度に物質表面上の磁性粒子の内部構造を制御しようとするアプローチも非常に可能性があるものと期待される．帯電した非磁性粒子の電極板表面への付着特性や層構造に関する研究は，これまで多くの研究者により非常に活発に研究がなされている．例えば，電気力により電極板表面に付着させ，所望の層構造を発生させようとする研究 (Oćwieja et al, 2017) ，帯電した棒状粒子の 2 次元系での凝集現象と相転移現象の研究 (Rutkowski et al, 2016) ，帯電した粒子の運動を電場により制御することで電極表面に付着させ，不純物質を取り除こうとする環境工学的な研究 (Choi et al, 2001)などが挙げられる．これらの現象解明もしくは技術構築を達成させるために，平板電極により発生した電場中における帯電粒子の動的な挙動の解明が精力的になされてきている (Watanabe et al, 2005…”

Section: 緒言磁性粒子を母液に懸濁して機能性を持たせた磁性サスペンションは，従来の流体工学(Wereley 2013)や磁気unclassified

3D Monte Carlo simulations on the control of the aggregate structures of cubic magnetic particles in terms of an external electric field

Satoh

Okada

Futamura

2018

Transactions of the JSME (In Japanese)

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We have addressed a suspension composed of magnetic cubic particles, which have a magnetic dipole moment at the particle center magnetized along the diagonal direction of the cube, in order to elucidate the physical phenomenon of the attachment characteristics and the aggregation structure of these particles, by means of Monte Carlo simulations. The cubic particles are negatively charged and confined between the two parallel walls one of which is positively charged (i.e., electrode) and the other is connected to the ground. The main results obtained here are summarized as follows. In the case of no external magnetic field, if the magnetic interaction is sufficiently strong for the formation of stable chain-like clusters, then longer chain-like clusters are formed between the two parallel walls and these clusters are more significantly located along the surface of the electrode as the electric interaction strength is increased. In the case of the electric particle-wall interaction being stronger than the magnetic interaction, almost all constituent cubic particles of chain-like clusters more significantly attach to the surface of the electrode in a face-to-face contact manner between the face of the cube and the wall. To the contrary, if the magnetic interaction is stronger than the electric interaction, the chain-like clusters are formed in the space of the two parallel walls from the end particle attached to the electrode wall. In the case of an external magnetic field applied along the surface of the electrode wall, the chain-like clusters are formed and extended from the surface to the space of the two parallel walls with the end of the particle of the clusters attached to the electrode wall.

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“…Satoh and his coworkers [4][5][6] proposed a so-called cluster-moving MC method to simulate the two-and three-dimensional microstructure of the magnetic fluid and they found that the magnetic particles were allied to form chainlike cluster along the applied magnetic field. Castro et al [7] proposed a poly-disperse particle model to study the microstructure of a magnetic fluid.…”

Section: Introductionmentioning

confidence: 99%

Simulation and control scheme of microstructure in magnetic fluids

Xuan

2007

SCI CHINA SER E

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By accounting for the external and internal force acting on the suspended magnetic nanoparticles and motion characteristics of the suspended magnetic nanoparticles in the magnetic fluids, the three-dimensional microstructure of magnetic fluids is investigated by means of the molecular dynamics simulation method. The distribution of suspended magnetic nanoparticles and microstructure of the magnetic fluid are simulated in both absence and presence of an external magnetic field. The effects of the nanoparticles volume fraction, the dipole-dipole interaction potential and the particle-field interaction potential on the microstructures of the magnetic fluids are discussed. The main results obtained here are summarized as follows. The suspended magnetic nanoparticles tend to aggregate and make the irregular distribution structure in the absence of an external magnetic field. When the magnetic fluid is exposed to a magnetic field, the magnetic nanoparticles suspended in the carrier fluid tend to remain chained-alignment in the direction of the external magnetic field. The tendency of chain-alignment morphology of the suspended magnetic nanoparticles is enhanced with the nanoparticles volume fraction, the dipole-dipole interaction potential and the particle-field interaction potential.

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Two-Dimensional Monte Carlo Simulations of a Colloidal Dispersion Composed of Polydisperse Ferromagnetic Particles in an Applied Magnetic Field

Cited by 5 publications

References 14 publications

Acoustic spectroscopy of magnetic fluids based on transformer oil

Acoustic spectroscopy of magnetic fluids based on transformer oil

3D Monte Carlo simulations on the control of the aggregate structures of cubic magnetic particles in terms of an external electric field

Simulation and control scheme of microstructure in magnetic fluids

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