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首頁(yè)> 外文學(xué)位 >Magneto-optical and rheological behaviors of oil-based ferrofluids and magnetorheological fluids.
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Magneto-optical and rheological behaviors of oil-based ferrofluids and magnetorheological fluids.

機(jī)譯：油基鐵磁流體和磁流變液的磁光和流變行為。

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摘要

The magneto-optical and rheological behaviors of magnetic fluids and magnetorheological (MR) fluids have been investigated. A magneto-optical apparatus was constructed which enabled us to investigate the birefringence and dichroism of ferrofluids at various levels of applied magnetic field. Specifically, the effects of the film thickness of oil-based ferrofluids and the concentration of surfactant in the oil-based ferrofluids on their magneto-optical behavior were investigated. A commercial magneto-rheological instrument (Physica MCR 301, Anton Paar) equipped with a cone-and-plate fixture was employed to investigate the transient and steady-state shear flow of both ferrofluids and MR fluids as a function of shear rate at various levels of applied magnetic fields. The rheological investigation has enabled us to determine the effect of applied magnetic field on the shear viscosity and yield stress of ferrofluids and MR fluids. A special ferrofluid was prepared by filtering out nearly all of the surfactant and small particles in an oil-based ferrofluid. We then compared its magneto-optical and rheological behaviors with those of an unfiltered ferrofluid. Further, we have found that the ferrofluid with a lower concentration of surfactant gave rise to larger birefringence and yield stress, and stronger shear thinning behavior than the ferrofluid containing a higher concentration of surfactant. This observation has lead us to conclude that an increase in unbound surfactant in a ferrofluid hindered chain formation of magnetic particles, leading to a decrease in the optical and rheological behaviors of the ferrofluid. Optical microscopy confirmed no visible chain formation of magnetic particles in the ferrofluid having a high concentration of surfactant owing to weak yield stress, birefringence, and shear thinning. On the other hand, we observed from optical microscopy that the filtered ferrofluid gave rise to larger yield stress, birefringence, and stronger shear thinning behavior. Thus, using optical microscopy we were able to explain the magneto-optical and rheological behaviors of the ferrofluids and magnetorheological fluids investigated.
機(jī)譯：已經(jīng)研究了磁性流體和磁流變（MR）流體的磁光和流變行為。構(gòu)造了磁光裝置，使我們能夠研究在不同水平的磁場(chǎng)作用下鐵磁流體的雙折射和二向色性。具體地，研究了油基鐵磁流體的膜厚度和油基鐵磁流體中表面活性劑的濃度對(duì)其磁光性能的影響。使用配有錐板夾具的商用磁流變儀（Physica MCR 301，安東帕爾）來(lái)研究鐵磁流體和MR流體在不同水平下的瞬時(shí)和穩(wěn)態(tài)剪切流與剪切速率的關(guān)系施加的磁場(chǎng)流變學(xué)研究使我們能夠確定施加的磁場(chǎng)對(duì)鐵磁流體和MR流體的剪切粘度和屈服應(yīng)力的影響。通過(guò)濾出油基鐵磁流體中的幾乎所有表面活性劑和小顆粒，制備了特殊的鐵磁流體。然后，我們將其磁光和流變行為與未過(guò)濾的鐵磁流體進(jìn)行了比較。此外，我們發(fā)現(xiàn)與表面活性劑濃度較高的鐵磁流體相比，表面活性劑濃度較低的鐵磁流體引起更大的雙折射和屈服應(yīng)力，以及更強(qiáng)的剪切稀化行為。該觀察結(jié)果使我們得出結(jié)論，鐵磁流體中未結(jié)合的表面活性劑增加會(huì)阻礙磁性顆粒的鏈形成，從而導(dǎo)致鐵磁流體的光學(xué)和流變行為降低。光學(xué)顯微鏡證實(shí)，由于弱的屈服應(yīng)力，雙折射和剪切稀化，在具有高濃度表面活性劑的鐵磁流體中沒(méi)有可見(jiàn)的磁性顆粒鏈形成。另一方面，我們從光學(xué)顯微鏡觀察到，過(guò)濾后的鐵磁流體會(huì)產(chǎn)生更大的屈服應(yīng)力，雙折射和更強(qiáng)的剪切稀化行為。因此，使用光學(xué)顯微鏡，我們能夠解釋所研究的鐵磁流體和磁流變流體的磁光和流變行為。

著錄項(xiàng)

  • 作者

    Getzie, Travis.;

  • 作者單位

    The University of Akron.;

  • 授予單位 The University of Akron.;
  • 學(xué)科 Engineering Materials Science.
  • 學(xué)位 Ph.D.
  • 年度 2012
  • 頁(yè)碼 191 p.
  • 總頁(yè)數(shù) 191
  • 原文格式 PDF
  • 正文語(yǔ)種 eng
  • 中圖分類(lèi)
  • 關(guān)鍵詞

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