本文選題：液滴蒸發(fā) + 聚二甲基硅氧烷　； 參考：《湖北工業(yè)大學(xué)》2017年碩士論文

【摘要】：隨著新型材料的不斷涌現(xiàn)和加工工藝的不斷優(yōu)化,以聚二甲基硅氧烷(polydimethylsiloxane,PDMS)為代表的軟襯材料在微納米加工技術(shù)、微納機電系統(tǒng)和微納流體系統(tǒng)等領(lǐng)域發(fā)揮著極為重要的作用。同時,液滴作為一種載體被廣泛應(yīng)用于這些系統(tǒng)中,但是由于液滴具有蒸發(fā)或揮發(fā)特性,一方面它將會影響這些系統(tǒng)的工作性能,另一方面它可用于實現(xiàn)一些新的功能。在液氣界面張力垂直分量的作用下,軟襯基底會產(chǎn)生一定的表面變形,這種變形將會影響液滴的蒸發(fā)行為,進而影響蒸發(fā)液滴的內(nèi)部流動。為此,本文開展了PDMS表面上的蒸發(fā)液滴內(nèi)部流動實驗研究,主要內(nèi)容如下:(1)開展了PDMS表面上的液滴蒸發(fā)實驗,發(fā)現(xiàn)PDMS質(zhì)量配比越大,基底彈性模量越小,常接觸面積(constant contact area mode,CCR)蒸發(fā)階段持續(xù)時間越長。在液滴為球冠狀和具有均勻的濃度梯度的假設(shè)下,得到了液滴以CCR模式蒸發(fā)時的解析解;(2)采用微觀粒子圖像測速技術(shù)(micro-particle imaging velocimetry,Micro-PIV)觀測了PDMS表面上的蒸發(fā)液滴的內(nèi)部流動,揭示了質(zhì)量配比對流型變化、速度分布和渦量分布的影響,并利用激光共聚焦顯微鏡對兩種濃度下溶液液滴蒸發(fā)殘留的圖案進行觀察,發(fā)現(xiàn)兩者存在明顯的差異;(3)采用粒子跟蹤測速(Particle Tracking Velocimetry,PTV)技術(shù)觀察了固液界面處的液體流動情況,發(fā)現(xiàn)在蒸發(fā)初始階段液體由液滴邊緣向液滴中心流動,而后運動發(fā)生反轉(zhuǎn)。使用最小二乘法分析了接觸線的運動特征,通過各種作用力和慣性力的量級比較,認(rèn)為接觸線處的微球的運動為準(zhǔn)靜態(tài)的,并建立了一種新的微球釘扎機制。
[Abstract]:With the continuous emergence of new materials and the continuous optimization of processing technology, the soft lining materials, such as polydimethylsiloxane polymethylsiloxane PDMSs, play an extremely important role in the fields of micro / nano machining, micro / nano electromechanical systems and micro / nano fluid systems.At the same time, droplets are widely used in these systems as a carrier, but due to the evaporation or volatilization characteristics of droplets, on the one hand, it will affect the performance of these systems, on the other hand, it can be used to achieve some new functions.Under the action of vertical component of liquid-gas interfacial tension, the soft liner substrate will produce a certain surface deformation, which will affect the evaporation behavior of the droplet, and then affect the internal flow of the evaporative droplet.In this paper, an experimental study on the internal flow of evaporated droplets on the surface of PDMS is carried out. The main contents are as follows: (1) the evaporation experiments on the surface of PDMS are carried out. It is found that the larger the mass ratio of PDMS is, the smaller the elastic modulus of the substrate is.The longer the evaporation stage of constant contact area mod.Under the assumption that the droplet is spherical and has a uniform concentration gradient, the analytical solution of the droplet evaporation in CCR mode is obtained. The micro-particle imaging velocimetric micro-PIV technique is used to observe the internal flow of the evaporated droplet on the PDMS surface.The effects of mass ratio convection distribution velocity distribution and vorticity distribution were revealed and the patterns of droplet evaporation at two concentrations were observed by laser confocal microscope.It is found that there is a significant difference between the two methods. The particle Tracking velocimetry (PTV) technique is used to observe the liquid flow at the solid-liquid interface. It is found that the liquid flows from the edge of the droplet to the center of the droplet at the initial stage of evaporation, and then the motion reverses.The motion characteristics of the contact line are analyzed by using the least square method. By comparing the magnitude of various forces and inertial forces, it is considered that the motion of the microsphere at the contact line is quasi-static, and a new pinning mechanism of the microsphere is established.
【學(xué)位授予單位】：湖北工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：O35

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