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  本文關(guān)鍵詞：壓電驅(qū)動式脈動微混合生成金納米粒子的研究　出處：《吉林大學(xué)》2012年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 壓電微泵 微混合器 Y型微流道 脈動微混合 金納米粒子

【摘要】：壓電驅(qū)動式脈動微混合作為一種新型流體微混合方式，在國內(nèi)屬于首創(chuàng)研究，其不僅具有重要的學(xué)術(shù)研究意義，而且在醫(yī)學(xué)、生物、化學(xué)等領(lǐng)域具有重要的應(yīng)用價值。 本文提出的壓電驅(qū)動脈動微混合系統(tǒng)是壓電微泵一個新的應(yīng)用基礎(chǔ)研究，通過對壓電微泵驅(qū)動電壓和頻率及混合模式的控制，使檸檬酸鈉和氯金酸溶液在Y型微混合器中實現(xiàn)紊流混合，提高了化學(xué)反應(yīng)速率及反應(yīng)質(zhì)量，從而實現(xiàn)了金納米粒子的可控合成。 通過對單腔體和雙腔體串聯(lián)壓電微泵理論輸出性能的對比，選擇了功能體積比更高的雙腔體串聯(lián)壓電微泵作為脈動微混合的驅(qū)動源，實現(xiàn)高性能流體脈動輸出�；�于壓電微泵設(shè)計理論，采用迭片技術(shù)，設(shè)計、制作出高性能雙腔體串聯(lián)壓電微泵，并對此微泵進行了相關(guān)性能實驗測試。實驗結(jié)果表明，雙腔體串聯(lián)泵在50V電壓200Hz頻率條件下流量達到4.2ml/min，壓力達到34kPa。 基于脈動微混合需要，設(shè)計出一種Y型微混合器。利用微混合理論，對微流體在不同輸入條件、不同流道尺寸條件下Y型微混合流道中的混合狀態(tài)進行了Fluent仿真分析。仿真結(jié)果表明，當(dāng)流道截面尺寸為0.4mm×0.4mm，入口流道夾角為60o，兩脈動流體輸入的相位差為180o，流量幅值為4ml/min，脈動頻率為300Hz時，混合度σ約為0.97；當(dāng)流道截面尺寸為0.4mm×0.4mm，兩入口流道夾角為60o，兩脈動流體輸入的相位差為180o，脈動頻率為200Hz，流量幅值為3ml/min時，混合度σ約為0.96�；�于以上仿真結(jié)果，設(shè)計出適合于壓電驅(qū)動式脈動微混合的Y型微混合器，采用PDMS材料，利用翻模技術(shù)制作出微混合器；對微混合器進行了替代溶液實驗，并利用高速攝像機采集到流道中脈動混合圖像，驗證壓電驅(qū)動式脈動混合模式能提高混合效率與混合質(zhì)量。 采用壓電驅(qū)動式微混合器進行了金納米粒子可控合成的實驗研究。通過調(diào)節(jié)壓電泵的驅(qū)動電壓、頻率及信號相位差，合成了不同形貌、不同粒徑及不同分散性的金納米粒子。實驗結(jié)果表明，，當(dāng)電壓為50V，頻率為200Hz，異相混合（脈動混合）時，混合效果較好，所生成金納米粒子較多，粒徑均一，分散性較好；對反應(yīng)溶液中加PVP與不加PVP生成的金納米粒子進行了研究，發(fā)現(xiàn)不加PVP時，粒子團聚嚴重，加入PVP后，粒子粒徑減小，單分散性顯著提高；分析不同反應(yīng)試劑濃度下生成金納米粒子的實驗結(jié)果得出，檸檬酸鈉濃度為0.5mM時較濃度為1.5mM和6.0mM時生成金納米粒子的粒徑分布、形貌、單分散性好。
[Abstract]:As a new fluid micro-mixing method, piezoelectric pulsating micro-mixing is the first research in China. It is not only of great academic significance, but also in medicine and biology. Chemistry and other fields have important application value. The piezoelectric pulsating micromixing system proposed in this paper is a new applied foundation research of piezoelectric micropump, through the control of the driving voltage, frequency and mixing mode of piezoelectric micropump. The turbulent mixing of sodium citrate and chloruronic acid solution in Y type micromixer improves the reaction rate and reaction quality, thus realizing the controllable synthesis of gold nanoparticles. By comparing the theoretical output performance of single cavity and double cavity series piezoelectric micropump, the double cavity series piezoelectric micropump with higher function volume ratio is selected as the driving source of pulsating micro mixing. Based on the design theory of piezoelectric micropump, the high performance double-cavity series piezoelectric micropump is designed and fabricated by lamination technology. The experimental results show that the flow rate of the double-chamber series pump reaches 4.2 ml / min at the frequency of 50V and 200Hz. The pressure reached 34kPa. Based on the need of pulsating micro-mixing, a Y-type micromixer is designed. The mixing state of Y-shaped micro-mixing channel is simulated by Fluent under different channel sizes. The simulation results show that the section size of the channel is 0.4mm 脳 0.4mm. When the inlet channel angle is 60o, the phase difference of the two pulsating fluids is 180o, the flow amplitude is 4ml / min and the pulse frequency is 300Hz, the mixing degree 蟽 is about 0.97; When the cross section of the channel is 0.4mm 脳 0.4mm, the angle between the two inlet channels is 60o. the phase difference of the two pulsating fluid input is 180o. the pulsation frequency is 200Hz. When the flow amplitude is 3 ml / min, the mixing degree 蟽 is about 0.96. Based on the above simulation results, a Y-type micro-mixer suitable for piezoelectric driven pulsating micro-mixing is designed, using PDMS material. The micro mixer is made by turning mould technology. The experiment of substituting solution for the micro mixer was carried out, and the pulsating mixing images in the flow channel were collected by high speed camera. It was proved that the piezoelectric driven pulsating mixing mode could improve the mixing efficiency and mixing quality. The controlled synthesis of gold nanoparticles was studied using piezoelectric driven micro mixer. Different morphologies were synthesized by adjusting the driving voltage, frequency and signal phase difference of piezoelectric pump. The experimental results show that when the voltage is 50V and the frequency is 200Hz, the mixed effect is better when the particle size is different and the dispersion is different. The gold nanoparticles are more uniform in particle size and have good dispersibility. The gold nanoparticles produced by adding PVP and no PVP in the reaction solution were studied. It was found that the agglomeration of gold nanoparticles was serious without adding PVP, and the particle size decreased and the monodispersity increased significantly after adding PVP. The experimental results of gold nanoparticles at different reaction reagent concentrations showed that the particle size distribution of gold nanoparticles was obtained when the concentration of sodium citrate was 0.5 mm compared with 1.5 mm and 6.0 mm of sodium citrate. Morphology, monodispersity is good.
【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2012
【分類號】：TH38

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