Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/3036
標題: 二氧化鈦/碳黑複合奈米流體製備與穩定性研究
Study on Preparation and Stability of Titanium Dioxide /Carbon Black Composite Nano-fluids
作者: 蕭羽辰
Xiao, Yu-Chen
關鍵字: 複合奈米流體;Composite nanofluids;碳黑;二氧化鈦;流變;穩定性;分散性;Carbon black;Titanium dioxide;Rheology;Stability and dispersion
出版社: 化學工程學系所
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Journal of Nano Particle Research 11(2009)1513-1520. [7] J Gustafsson, P Mikkola, M Jokinen, J B Rosenholm: The influence of pH and NaCl on the zeta potential and rheology of anatase dispersions. Physicochemical and Engineering Aspects 175(2000)349-359. [8] M E Meibodi, M Vafaie-Sefti: The role of different parameter on the stability and thermal conductivity of carbon nanotube/water nano-fluids. International Communication in Heat and Mass Transfer 37(2010)319-323. [9] P Garg, J L Alvarado, Ch Marsh, T A Carlson, D A Kessler, K Annamalai: An experimental study on the effect of ultrasonication on viscosity and heat transfer performance of multi-wall carbon nanotube-based aqueous nano-fluids. International Journal of Heat and Mass Transfer 52(2009)5090-5101. [10] M N Pantzali, A A Mouza, S V Paras: Investigating the efficacy of nano-fluids as coolants in plate heat exchangers (PHE). Chemical Engineering Science 64 (2009)3290-3300. 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摘要: 
  奈米科技是21世紀最重要的科技之一,隨著尺寸的縮小,奈米流體的各種特性與微米尺度所觀察到的性質差異很大,但奈米流體在使用上卻碰到難題,無數很小顆粒的金屬,會因為顆粒過小而產生聚集的現象,雖然在奈米等級的各種金屬性質都來的比一般金屬來的好,但也同樣面臨穩定性不足,分散性不佳的問題。
  本實驗參考各種文獻以及奈米流體分散的方法,探討影響分散的原因,發現二氧化鈦的奈米流體穩定性十分良好,但各種奈米流體的性質沒有明顯增加其性質,故添加第二種碳黑奈米粒子,進而製備出二氧化鈦/碳黑複合奈米流體,希望能夠增加原始的性質,並期望能夠維持其穩定性與分散性。藉由探討超音波製程與研磨製程的不同,可以發現超音波製程分散性均一性比較高,並比較碳黑的分散性,選擇出最佳製備二氧化鈦/碳黑複合奈米流體的方法,利用原子力顯微鏡探討其表面的形貌,可以發現粒徑邊界已經打開,利用粒徑分析儀與穿透式電子顯微鏡驗證分散性;我們製備的0.5w%、2.0w%、5.0w%TiO2加碳黑0.0025g複合奈米流體分別為64.9nm、75.6nm、91.3nm,可以分別放置為8、4、2個小時,均還是100nm以下的流體,而從穿透式電子顯微鏡可以更加證明出我們利用粒徑分析儀得到的結果,我們可以得到0.5w%、2.0w%、5.0w%TiO2加碳黑0.0025g複合奈米流體分別為約30nm、60nm、90nm製備出分散性良好的奈米流體。我們量測其流體的性質,並針對二氧化鈦加碳黑複合奈米流體進行流變的分析,其流體同樣是類似牛頓流體,即增加碳黑對於流體的黏度影響不會產生很大的改變,可以視為原始基液的性質。

Nanotechnology is one of the most important science technologies in the 21st century. With the reduction of size;We discover that the various characteristics exhibited by nano-fluids show huge differences from those of micro-fluids. However, we have encountered problems to put nano-fluids into practice. For instance, many small particles of metal would aggregate because the particles are too small. A variety of metal perform better when they are at the nanometer scale, but we also face such problems as low stability and poor dispersion. This study uses many references and discusses how nano-fluids disperse in order to find out what affects dispersion. The results indicate that the nano-fluids of titanium dioxide are very stable, but the nano-fluids of other metal show no significant changes. Therefore, we add a second generation of nano particles based on carbon black to produce the titanium dioxide/carbon black nano-fluids. In this way, we hope to enhance the characteristics of nano-fluids and to maintain their stability and dispersion. We explore the differences between ultrasonic process and grinding process, to compare the dispersion of carbon black in order to find the best method to prepare and produce titanium dioxide/carbon black composite nano-fluids, and we find that it is uniform on ultrasonic process. When we put the composite nano-fluids under the scope of atomic force microscopy, we find that the boundaries of particle sizes are blurred. Then we use dynamic light scattering particle size analyzer nano and transmission electron microscopy to examine the dispersion of carbon black nano-fluids. We prepare 0.5w%, 2.0w% and 5.0w% of titanium dioxide, each added with 0.0025g of carbon black, to produce 64.9nm, 75.6nm and 91.3nm of titanium dioxide/carbon black composite nano-fluids. The fluids are respectively placed for 8, 4 and 2 hours and can still maintain the sizes below 100nm. Then we examine through transmission electron microscopy, which better supports the results we obtain by using dynamic light scattering particle size analyzer nano. We find that 0.5w%, 2.0w% and 5.0w% of TiO2 added with 0.0025 g of carbon black nano-fluids are approximately 30nm, 60nm, 80nm in sizes. After preparing the nano-fluids with good dispersion, we measure the characteristics of these nano-fluids and do rheological analysis on titanium dioxide/carbon black composite nano-fluids. These nano-fluids have as Newtonian fluids. Increasing the amount of carbon black does not greatly affect the viscosity of nano-fluids, which can be regarded as a feature of the original base fluid.
URI: http://hdl.handle.net/11455/3036
其他識別: U0005-2108201217140200
Appears in Collections:化學工程學系所

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