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Hassan, Rizwan Ul,Jo, Soohwan,Seok, Jongwon World Scientific Publishing Company 2018 Functional materials letters Vol.11 No.2
<P>The feasibility of fabrication of shape memory polymers (SMPs) was investigated using a customized 3-dimensional (3D) printing technique with an excellent resolution that could be less than 100 microns. The thermorheological effects of SMPs were adjusted by contact and non-contact triggering, which led to the respective excellent shape recoveries of 100% and 99.89%. Thermogravimetric analyses of SMPs resulted in a minor weight loss, thereby revealing good thermal stability at higher temperatures. The viscoelastic properties of SMPs were measured using dynamic mechanical analyses, exhibiting increased viscous and elastic characteristics. Mechanical strength, thermal stability and viscoelastic properties, of the two SMPs were compared [di(ethylene) glycol dimethacrylate (DEGDMA) and poly (ethylene glycol) dimethacrylate (PEGDMA)] to investigate the shape memory behavior. This novel 3D printing technique can be used as a promising method for fabricating smart materials with increased accuracy in a cost-effective manner.</P>
Electric field effect on the dynamics of viscous fluids flow between capillary slits
Rizwan Ul Hassan,Shaheer Mohiuddin Khalil,Doyoung Byun 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
In addition to laboratory research, a fuller understanding of the viscous fluid dynamics between parallel plates necessitates the use of increasingly sophisticated numerical simulations and mathematical models. We look at how different viscous fluids flow between parallel plates, driven by the combined effects of capillary and electric potential, to achieve rapid filling in this study. We show that an electric field actuation produces a quicker filling of a viscous liquid between parallel plates as compared to a basic capillary actuation. We conducted experiments to gain a better knowledge of the dynamics of various viscous fluids, such as the fluids ionic concentrations and apparent viscosity. The use of electric potential resulted in a significant reduction in the filling time for high viscosity fluids between parallel plates.