Theses and Dissertations

Date of Award

8-1-2024

Document Type

Thesis

Degree Name

Master of Science in Engineering (MSE)

Department

Mechanical Engineering

First Advisor

Ali Ashraf

Second Advisor

Karen Lozano

Third Advisor

Victoria M. Padilla

Abstract

Advancing materials for water desalination and sensing is essential for tackling global issues related to clean water and efficient energy systems. This thesis explores the application of 2D nanomaterials, specifically graphene, integrated onto 1D poly(vinylidene fluoride) (PVDF) nanofibers to enhance their effectiveness in these areas. Utilizing innovative techniques such as Forcespinning® and plasma treatment, PVDF nanofibers were strengthened with graphene and conductive polymers like poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT: PSS). The research involved thorough assessments using direct contact membrane distillation (DCMD) systems, oil-water separation tests, and various mechanical and electromechanical evaluations. Heat-pressed membranes consistently delivered a flux of 0.33 kg/m²/hr and a high rejection rate of 95%. Tensile tests demonstrated notable improvements in mechanical strength, with heat-pressed membranes enduring up to 2.25 lbF. Plasma-treated sensors also exhibited enhanced electromechanical properties, generating up to 70 mV of maximum voltage and displaying a resistance change of 678% under mechanical stress. This research advances the development of durable and efficient nanofiber membranes and sensors, offering effective solutions for sustainable water purification and advanced electromechanical devices.

Comments

Copyright 2024 Elmmer A. Vera Alvarado. https://proquest.com/docview/3115383923

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