以改良式真空潛弧系統製備奈米氧化銅流體之懸浮穩定性探討

The suspension stability research of an innovation Submerged Arc Nanoparticles Synthesis System for preparing CuO nanofluid

陳信銓(Xin-Quan Chen)

指導教授 ： 張合

國立臺北科技大學/機電學院/機電整合研究所/碩士(2008年)

摘要

具有高度懸浮穩定性之奈米流體在工業應用上，才可確保奈米化之獨特性與應用價值。由於奈米顆粒間擁有吸引力使奈米顆粒產生團聚，因此奈米顆粒需要利用不同分散方法使其分散穩定和擁有奈米顆粒本身的特性。本研究是利用改良式真空潛弧製造系統(SANSS)來製備奈米氧化銅(CuO)溶液懸浮液，針對改良先前製具及製程參數，如峰質電流、崩潰電壓及放電幅等，以期獲得分散穩定之氧化銅懸浮液的製備條件。由實驗結果得知，改良後之製具其製備出之奈米流體的懸浮分散更佳穩定，針對所製備出之奈米流體檢測其平均粒徑、粒徑分佈、形貌特性、pH值、介面電位、光吸收值及材料結構等特徵，經由長時間的觀察及量測靜置時間與上述奈米流體特性變化之關連性，最後利用DLVO理論的凡德瓦爾力及電雙層排斥力結合總交互作用能Vtotal來探討流體的能障值與穩定關係，藉以了解真空電弧奈米流體合成系統內部顆粒是以電雙層分散機制達到穩定，以驗證此真空電弧奈米流體合成系統可保持長時間之懸浮穩定性，至少半年時間的分散穩定。

關鍵字

真空電弧 ； 懸浮穩定性 ； 氧化銅奈米流體 ； 介面電位 ； DLVO理論

並列摘要

Nanofluid has good suspension stability which may guarantee that nanotechnology of unique material characteristics and the application value in the industrial application. The attractive force between the nanoparticles can cause them to aggregate. Therefore, nanoparticles need to be dispersed by different methods in order to stabilize suspension and completely utilize their unique material characteristics. This purpose of this study is to use an innovation Submerged Arc Nanoparticles Synthesis System(SANSS) to prepare the copper oxide nanofluid. This study aims to reform fore tools and parameter such as peak current, breakdown voltage and pulse-duration, to expect that the condition of prepare good suspension stability CuO nanofluid. From experiment results reveal that the reformatory tools prepares good stability suspension. The nanofluid utilize to examine its average particle diameter, size distribution, observe the morphology of the particles, the pH value, Zeta potential, light adsorption value, and the composition. By the way of long time, observing and measuring the correlation of settles time with the variation of characteristic of nanofluid. Finally, to utilize the total interaction energy of DLVO theory, which composes of the van der waals attraction and the electrostatic repulsion energies, is applied to explain the relation of energy barrier with stability. So as to understand and confirm nanofluid which prepare by Submerged Arc Nanoparticles Synthesis System(SANSS) can be stabilized for a period of time longer than six months by the electrostatic mechanism.

並列關鍵字

SANSS ； Suspension stability ； CuO nanofluid ； Zeta potential ； DLVO theory

參考文獻

[1] Richard P F. There's Plenty of Room at the Bottom, annual meeting of the American Physical Society, 1959.

[2] Kubo R. Electrical Properties of Metallic Fine Particles .Journal of the Physical Society of Japan, 17(6), 1962: 975-986.

[3] Birringer R, H. Gleiter, H. –P. Klein,et al. Nanocrystalline Materialsan Approach to a Novel Solid Structure with Gas Like

[8] Pai S H, Tsung T T. Optimization and Properties Research of the Ultrasonic-aided SubmergedArc Nanoparticle Synthesis System for preparing TiO2 Nanoparticle Suspension [D] .National Taipei University of Technology, 2004.

[10] J Ren, S Lu, J Shen,, C Yu. Powder Technology, 2001,120(3)：187~193