Brownian dynamics simulation of a dispersion composed of disk-like hematite particles regarding the orientational distribution and the magneto-rheological properties

Structural- and optical-properties analysis of single crystalline hematite (α-Fe2O3) nanocubes prepared by one-pot hydrothermal approach

“…46 Previously, many experimental and theoretical studies primarily focused on the size and morphology of the α-Fe 2 O 3 nanostructures. [47][48][49] Since α-Fe 2 O 3 is well-known for its various applications. Hence, one of the most important aims of this paper was to present a study of the time-dependent morphological evolution of α-Fe 2 O 3 and its transformation from 0D to 3D (cubic shape).…”

Anisotropic magnetic nanoparticles for biomedicine: bridging frequency separated AC-field controlled domains of actuation

“…In order to shed some light on this question, we have theoretically investigated what would be the heating properties of anisotropic nanomagnets in a viscous environment, if the Néel contribution is quenched, for example in large (> 20 -50 nm) nanoparticles with high anisotropy. By using a Brownian dynamics technique 13 we have simulated the AC field response of magnetic disks of large (> 2 -4) aspect ratio, able to provide large mechanical action. The interest in the disk shape is the similarity to the blood cells freely travelling within the vessels, hence constituting a very interesting morphology for the colloidal properties for intravenous injection.…”

“…We used the same model as in Ref. [13], i.e. disk-like particles as schematically drawn in Figure 1 which, in addition to the usual translational and rotational Brownian motion, it is considered the spin Brownian motion about the particle axis.…”

“…The rotational motion about a line normal to the particle axis and the spin rotational motion about the particle axis are expressed, respectively, as 2) show the equations providing the particle direction e and the magnetic moment direction n, respectively (note the simplification regarding the same expressions in Ref. [13], since no shear flow is considered in the present work). The components normal and parallel to the particle axis are denoted by the subscripts  and ||, respectively; and Δt, k and T are the time interval, Boltzmann's constant and liquid temperature, respectively.…”

ハーゲン・ポアズイユ流中における扁平状磁性粒子の吸着特性（ブラウン動力学シミュレーションによる解析）

“…© The Japan Society of Mechanical Engineers 薬剤を保持する機能を付加した高次機能性磁性粒子の創製 (Patra et al, 2015, Erb et al, 2009, Weingart et al, 2013 ， 腫瘍やがん細胞に対して効果的に薬剤を誘導する delivery システムの構築 (Takeda et al, 2007, Shapiro, 2009および目的部位に対して薬剤を放出するメカニズムの確立 (Müller-Schulte and Schmitz-Rode, 2006, Kim et al, 2008, Shamim et al, 2006を対象とした研究に大別される．近年では，これまで比較的対象とされてこ なかった磁場勾配を用いて血管内へ注入された磁性粒子を目的部位へと誘導する delivery システムの構築を主眼 とした実験 (Asfer et al, 2017)およびシミュレーション的研究 (Heinrich et al, 2015, Sharifi et al, 2019が遂行さ れるに至っている．また，従来の drug delivery システムに関する研究では，球状磁性粒子を対象とした研究が主 であった．しかしながら，磁性粒子調製技術の発展に伴い，棒状粒子などの非球状磁性粒子を対象とした研究が 近年において活発に遂行されるに至っている．さらには，球状磁性粒子と比較して細胞表面に対する吸着性能に 優れているという利点から扁平状磁性粒子を対象とした機能性粒子創製に関する実験的研究 (Wang et al, 2019, Lin et al, 2016, Truong et al, 2015, Goiriena-Goikoetxea et al, 2020 (Satoh and Sakuda, 2009, Satoh and Sakuda, 2010, Satoh, 2015a, 2015b…”