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Moving of Magnetic Clusters Driven by an/Applied Eccentric Rotational Magnetic Field

機譯：偏心旋轉磁場驅動的磁簇的運動

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摘要

Magnetic swimmers have been studied with the purpose of applying them to mimic the motion of organisms in fluids. Clusters formed by self-assembled magnetic particles is one the possible approaches for that purpose. A considerable amount of effort has been made on applying uniaxial, biaxial, and triaxial magnetic fields to study self-assembled clusters. For the case where biaxial magnetic fields are applied, a circular rotational magnetic (CRM) field is usually adopted. Relevant results concerning the behavior of these clusters in eccentric rotational magnetic (ERM) fields are limited. This may be due to the limited number of stable conformations formed in such a magnetic field is linear. In this thesis, we show that several unique metastable cluster structures can form in an ERM field. The clusters are formed by applying a CRM field to a dispersion containing paramagnetic particles to form a specific configuration and then the magnetic field is switched to an ERM those field to visualize new dynamics. These 2-D clusters can be driven by the applied magnetic field, yielding an appreciable net displacement, and exhibit specific dynamic behavior. The behavior of these clusters is influenced by the surface charge of the comprising magnetic particles, the strength and the frequency of the applied magnetic field, and the viscosity of the dispersion fluid. A model is proposed to simulate the phenomena observed in the experiment which describes successfully the displacement of a pentamer colloidal cluster.
機譯：已經(jīng)研究了磁性游泳者，其目的是將其應用于模仿流體中生物的運動。由自組裝磁性顆粒形成的團簇是為此目的可能的方法之一。在應用單軸，雙軸和三軸磁場研究自組裝簇方面已經(jīng)做出了相當大的努力。對于施加雙軸磁場的情況，通常采用圓形旋轉磁場（CRM）。有關這些團簇在偏心旋轉磁場（ERM）場中的行為的相關結果是有限的。這可能是由于在這種磁場是線性的情況下形成的穩(wěn)定構象的數(shù)量有限。在本文中，我們證明了在ERM字段中可以形成幾種獨特的亞穩(wěn)態(tài)簇結構。通過將CRM場施加到包含順磁性粒子的分散體上以形成特定的配置，然后將磁場切換到ERM那些場以可視化新的動力學，從而形成了簇。這些二維簇可以由施加的磁場驅動，產生可觀的凈位移，并表現(xiàn)出特定的動態(tài)行為。這些簇的行為受所包含的磁性顆粒的表面電荷，所施加磁場的強度和頻率以及分散液的粘度的影響。提出了一個模擬實驗中觀察到的現(xiàn)象的模型，該模型成功地描述了五聚體膠體簇的位移。

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  • 作者

    Hsu, Chien.;

  • 作者單位

    Rice University.;

  • 授予單位 Rice University.;
  • 學科 Chemical engineering.
  • 學位 M.S.
  • 年度 2016
  • 頁碼 89 p.
  • 總頁數(shù) 89
  • 原文格式 PDF
  • 正文語種 eng
  • 中圖分類
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