Abstract
Filament stretching using a flow-focusing microfluidic device coupled with image analysis has emerged as a promising method to resolve extensional properties of low viscosity, low molecular weight solutions. This method was used to calculate extensional properties of aqueous methylcellulose (MC) solutions at varying NaCl concentrations, where transient changes in filament diameter were used to calculate the flow-driven, apparent extensional viscosity of each solution. The increase in apparent extensional viscosity at room temperature as the NaCl concentration increases is attributed to the presence of a fibrillar MC network formed in solution.
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