Characterization and preparation of magnetic fluid with anti-agglomeration

• Main Authors: Hua-Ching Hsueh, 薛華慶
• Other Authors: 芮祥鵬
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/ac744n

碩士 === 國立臺北科技大學 === 分子科學與工程系有機高分子碩士班 === 106 === Magnetorheological fluid is a kind of intelligent liquid, which is mainly composed of magnetic particles, carrier liquid and surfactant. It has significane Magnetorheological effect in additional magnetic field. It has been widely used in chemical, mechanical and automotive industries now, but it is not popular. The purpose of this study is to prepare anti-agglomerate magnetorheological liquids and to investigate their properties and compare them with commercial products. Therefore, this study is divided into two parts: synthesis multi-wall carbon nanotubes with carbonyl iron, then investigat its magnetorheological properties；Carbonyl Iron surface modification with Silane coupling agent, then investigat its magneto -rheological properties. We fabricated multi-walled carbon nanotubes (MWCNTs) on the surface of CI particles by using p-aminobenzoic acid as a grafting agent. This process not only preserve a good saturation magnetization but also increases its dispersion.；Using silane coupling agent to modify surface of carbonyl iron, functionalizing the surface of carbonyl iron to protect the carbonyl iron powder from agglomeration close to each other. According to the experimental results confer that both methods can prevent the rapid sedimentation of magnetic particles to achieve the purpose of anti-agglomeration. Observe the surface and structure by SEM, TEM and IR, using a rheometer to test the magnetorheological effect, saturation magnetic measured by Vibrating Sample Magnetometer, using laser light transmittance detector to test anti-agglomeration effect. In addition, when the carrier liquid was 10 cp of silicon oil with suitable quantity of thickener, it had lower viscosity and higher shear stress than commercial products.