An Innovative Nanofluid Manufacturing System

創新式奈米流體製備系統

張合(Ho Chang) ； 高木榮(Mu-Jung Kao)

《中國機械工程學刊》 28卷2期 (2007/04) Pp. 187-193

https://doi.org/10.29979/JCSME.200704.0010

摘要

本文旨在發展一套創新式之奈米流體製備系統，此系統係由作者所發展之潛弧奈米流體合成系統加以改良，即利用監測奈米流体之導電度以獲得粒徑分佈性良好之TiO2奈米流體，同時藉由控制閥之自動控制而可以連績的方式生產奈米流體，此系統係以去離子水作為介電液，當經電弧作用所產生之奈米流體其比電阻值達設定值後，奈米流體能自動流出系統而至收集腔體中，同時純淨的去離子水立即自動的被抽取補充到真空腔体內，以持績的產出具有一致性的TiO2奈米流體。經由實驗證實，TiO2奈米流體之比電阻值對於奈米顆粒之粒徑與尺寸一致性之影響非常大，當比電阻值在1500~1650 kΩ•Cm範圍時，可得到尺寸一致性最理想的TiO2奈米顆粒。另其pH為7.5，遠大於等電位之pH4，且其zeta電位達45mV，因此，所製備之TiO2奈米流體具有穩定懸浮特性。此外，文中也針對所產出之TiO2奈米流體進行材料特性量測及分析，包括形貌、濃度檢測及介面電位等。

並列摘要

This paper presents an innovative nanofluid manufacturing system which is an improvement of the Submerged Arc Nanofluid Synthesis System developed by the author. The new system makes use of the monitored conductivity of a nanofluid to acquire the TiO2 nanofluid with good distribution of nanoparticles sizes. Meanwhile, through the automatic control function of control valve, a nanofluid can be produced continuously. When specific resistance of the nanofluid caused by electric discharge machining reaches a preset value, the nanofluid can automatically flow from the system to the collection chamber. At the same time pure deionized water can be immediately and automatically pumped out for supplementing the vacuum chamber, so as to produce conforming TiO2 nanofluid continuously. When the specific resistance is in the range of 1500 kΩ•cm ~ 1650 kΩ•cm, the TiO2 nanoparticles of the most ideal size conformity can be acquired. The pH of the prepared TiO2 nanofluid is 7.5, which is much higher than that of isoelectric point (i.e.p.) by about 4. In addition, the zeta potential of the produced TiO2 nanofluid reaches as high as 45mV, Hence, nanoparticles suspending to deionized water already have possessed electrostatic stability properties. This paper also conducts measurement and analysis of the material properties of the produced TiO2 nanofluids, including their morphology, concentration and Zeta potential.

並列關鍵字

conductivity ； nanofluid ； zeta potential