高濃度乳液結構流變學

Abstract

我們自製構造了一個的設備，結合了時間、光散射和應力的測量，設備上允許我們同步擷取的結構和流變性質的資訊，用以研究受剪切下濃Emulsion的複雜結構和機械行為。實驗結果提供我們對Emulsion更詳細的流變學與油滴結構複雜關係理解，在有限的剪切速率對Emulsion的作用下有剪切稀化的現象。光散射結果表明高和低剪切速率的油滴結構破壞，而在中等剪切速率液滴順序強烈油滴結構誘導，油滴排列的結構影響也可以在流變反應中被發現。結合油滴排列結構 ( 光散射圖案 ) 與流變 ( 應力 ) 反應，我們發現更好的油滴排結構對應到較弱的應力，這個結果可以解釋為Emulsion受一定範圍內的剪切速度，油滴呈現較有序的排列結構(HCP)，導致較小的應力。We use a homemade device combining time-resolved light scattering and stress measurement to study the complex structural and mechanical behavior of concentrated emulsions under shear. Our device allows us to measure the structure and the rheology synchronously. The results of our experiments provide us a insight full information the complex structure-rheology relationship of the emulsions in a more detailed then rheometer manner. Shear thinning behavior at finite shear rates is observed. The light scattering result shows that the inter-droplet order is weakly induced at high and low shear rates while at medium shear rate the droplet order is strongly induced. The inter-droplet structure is coupled with the rheology behavior. Combining the structural (scattering) and the rheological (stress) responses, we discovered that within certain range of shear rate, better inter-droplet order corresponds to weaker stress response.