以電漿電弧法製備奈米銅流體之最佳化研究

Abstract

本研究自行研發完成之奈米流體製備系統以氣相合成法製造二次粒徑銅奈米流體。藉由過去文獻與研究資料找出影響奈米粒子粒徑的相關實驗參數並設計出直交表，將實驗產物以SEM、EDS、TEM、粒徑分析儀與光譜儀等檢測儀器分析形貌與成分。最後利用田口實驗法找出製備銅/奈米流體的最佳化參數，並結合變異數分析進行分析。經實驗結果得知，不同參數下生成的產物出現團簇現象，且因冷卻導致出現片狀及立方體狀之粒子形貌，但都已達到奈米級粒子，且成分確為銅材質。由光譜儀觀察得到L9的實驗參數吸收率最大，表示該實驗參數可得較高濃度之銅/奈米流體影響。另由田口實驗法分析得到之最佳化參數為收集液常溫、電流60A、脈衝頻率15Hz、反應氣體流量1.5Lpm，所得到的奈米粒子二次粒徑為最小，可達到240 nm左右，其中由變異數分析法計算可得反應氣體流量及電流安培為製備銅/奈米流體影響因素為顯著因素。

This study use the method of nanofluid vapor phase synthesis to make secondary particle size of copper nanofluids which is developed by our own laboratory. According to previous literature and research data, the researcher identify the impact of nano-particle size and design parameters orthogonal array. After that, the researcher uses SEM, EDS, TEM, particle size analyzer, and Optical spectrometer to analyze the morphology and composition of the experimental products. Eventually, the researcher uses Taguchi method to get the parameters of copper nanofluid optimization, and then the researcher also uses variance analysis to analysize them. As a result, different products under different parameters lead to clusters phenomenon and the cooling process makes the particles become flake or cube-shaped, however, they all reach the nanometer-sized particles and the composition is indeed the copper. By the spectrometer, L9 gets the maximum parameters of absorption, which indicate that the experimental parameters can get the higher concentration of copper nanofluid effects. Moreover, the researcher obtains the optimal parameters for the collection of fluid temperature at room temperature, amperage 60A, pulse frequency 15Hz, reactive gas flow 1.5Lpm by the Taguchi method. Futhermore, it gets the shortest secondary particle diameter of the nanoparticles. It is about 240 nm. Finally, the reaction gas flow and amperage for the preparation of copper nanofluid are the significant factors.