請用此 Handle URI 來引用此文件:
http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/37990
標題: | 電荷可調節之球形粒子在球形孔洞中任意位置的電泳:牛頓與卡羅流體 Electrophoresis of a Charge-Regulated Sphere at an Arbitrary Position in a Spherical Cavity: Newtonian and Carreau Fluids |
作者: | Chi-Ying Chen 陳旂瑩 |
指導教授: | 徐治平(Jyh-Ping Hsu) |
關鍵字: | 電泳,可調節電荷,帶電球殼邊界,卡羅流體,電滲透流, electrophoresis,charge-regulated sphere,charged spherical cavity,electroosmotic flow, |
出版年 : | 2008 |
學位: | 碩士 |
摘要: | 本論文以有限元素分析法研究帶電邊界對可調節電荷球形粒子,在充滿牛頓與非牛頓流體的球形孔洞任意位置的電泳行為,並配合表面弱電位(< 25 mV)以及整個系統處於均勻弱電場(< 25 kV/m)的影響。因為使用了更符合實際的電力計算式,其可被適用於任一系統全對稱或不全對稱的問題,所以之前的文獻則需重新被修正。而且還觀察到更多有趣的現象。
經由數值模擬的結果顯示,我們可以發現下列幾個因素對於膠體粒子電泳行為有重大的影響:粒子在球殼中的相對位置、粒子和球殼的相對大小、電雙層厚度,以及粒子表面的電荷密度。除此之外,剪切稀釋對於粒子的運動則有幫助效應。且因為球殼帶電,會促使電滲透流的產生,這將導致靜電力(electrostatic force)與流動力(hydrodynamic force)之間的競爭,會使得球形粒子在此系統中的電泳現象變為更為複雜。 The electrophoresis of a charge-regulated spherical particle at an arbitrary position in a charged spherical cavity is modeled under the conditions of low surface potential (<25 mV) and weak applied electric field (<25 kV/m). The charged cavity allows us to simulate the effect of electroosmotic flow, and the charge-regulated nature of the particle permit us to model various types of surface. The problem studied previously (Yu et al., Colloid Polym. Sci. 2004, 283, 10) is re-analyzed based on a more rigorous electric force formula. In particular, the influences of various types of charged conditions on the electrophoretic behavior of a particle and the roles of all the relevant forces acting on the particle are examined in detail. Several new results are found. For instance, the mobility of a particle has a local minimum as the thickness of double layer varies, which is not seen in the cases where the surface of a particle is maintained at a constant potential and at a constant charge density. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/37990 |
全文授權: | 有償授權 |
顯示於系所單位: | 化學工程學系 |
文件中的檔案:
檔案 | 大小 | 格式 | |
---|---|---|---|
ntu-97-1.pdf 目前未授權公開取用 | 585.42 kB | Adobe PDF |
系統中的文件,除了特別指名其著作權條款之外,均受到著作權保護,並且保留所有的權利。