Thermal transport of polyethylene oxide (PEO) nanofibers fabricated from near-field electrospinning: effect of molecular weight and molecular concentration.

Materials Today Communications · 2025-11-23 · 1 citations

Optimizing electrohydrodynamic direct-writing with multilayer perceptron: accurate and efficient predictions of jet profiles

Journal of Intelligent Manufacturing · 2025-01-11 · 4 citations

Investigating the Impact of Geometric and Surface Factors on the Aerosol Capture Efficiency of Electrospun Polymeric Fibers

International Journal of Precision Engineering and Manufacturing · 2024-10-25

Demonstration of an integrated-heating load frame for quantitatively assessing microscale tensile properties of copper and Zircaloy-2

Journal of Nuclear Materials · 2024-08-13 · 2 citations

Fabrication and Customization of Highly Porous PLGA Membranes Utilizing Near‐Field Electrospinning, Thermal Transitions, and Multilayer Strategies

Advanced Engineering Materials · 2024-09-19 · 12 citations

Polymer porous membranes are crucial in various applications, including water filtration, tissue engineering, and drug administration. Conventional far‐field electrospinning (FFES) is widely used for producing polymeric membranes due to its cost‐effectiveness, scalability, and flexibility in using many polymers. However, FFES has limitations in controlling pore form and size, as it produces randomly oriented fibers that lead to inconsistent and noncustomizable pore sizes. To address these limitations, this work combines near‐field electrospinning (NFES) with thermal treatment of polymer fibers and membranes. NFES offers more precise control over fiber placement and alignment, producing well‐defined fiber patterns with consistent and customizable pore sizes without compromising the thickness of membranes. By exploring the interplay between polymer behavior, thermal effects, and capillary action, the differences in pore area under various temperatures and fiber spacings are characterized. Additionally, this study investigates the influence of multilayer infusion on pore size and geometric arrangement by examining multilayer configurations stacked at various angles. The results indicate that increasing the number of layers leads to decreased pore size, while the alignment of infused fibers affects pore shape. This integrated approach enhances control over membrane characteristics, improving the performance and consistency of polymer porous membrane fabrication across various applications.

Fabrication and customization of highly porous PLGA membranes utilizing near-field electrospinning, thermal transitions, and multilayer strategies

2024-04-18

Polymer porous membranes play a crucial role in various applications, including water filtration, tissue engineering, and drug administration. Conventional electrospinning is employed for the production of polymeric membranes because of its cost-effectiveness, scalability, and the flexibility. However, it has limitations in terms of controlling the form and size of the pores. Ensuring the ability to maintain a consistent and customizable pore size without sacrificing the thickness of the membrane becomes more crucial to satisfy the various requirements of cell and tissue engineering applications. To address these limitations, this work combines Near-Field Electrospinning with thermal treatment of polymer fibers and membranes by exploring the connection between polymer behavior, thermal effects, and capillary action by measuring the fluctuations in pore area under different temperatures and fiber spacings. Furthermore, the study investigated the influence of multilayer infusion on pore size and geometric arrangement by investigating multiple-layer configurations stacked at different angles. The results indicated that increasing layers leads to decreasing pore size, while the alignment of infused fibers adds to differences in pore form. By enabling enhanced control over membrane characteristics, the proposed approach can enhance the performance and consistency of polymer porous membranes in a wide range of applications.

Suspended Graphene/PEDOT: PSS‐PEO Channel for H₂ Gas Sensing Fabricated Using Direct‐Write Functional Fibers

Advanced Materials Technologies · 2023-02-03 · 6 citations

Abstract In this study, the hydrogen gas (H 2 ) sensing mechanism of suspended graphene (Gr)/ Poly(3,4‐ethylene dioxythiophene): Poly(styrene sulfonate) – Polyethylene oxide (PEDOT: PSS‐PEO) composite nanoscale channels precisely patterned with near‐field electrospinning is investigated. Suspended Gr/PEDOT: PSS‐PEO nanoscale channels not only have a higher surface‐to‐volume ratio for easy diffusion in/out of the composite but also show enhanced response due to effective charge transfer at the interface of suspended graphene and PEDOT: PSS‐PEO nanofiber. A sensing response of 2% for 1 ppm of H 2 concentration with good linearity over a wide dynamic range is achieved. Arrays of nanoscale channels for enhanced sensitivity are also implemented and microheaters for effective and fast device recovery are integrated. Moreover, the sensor response is also characterized at various conditions such as channel materials and sizes, temperatures, and gas concentrations. The demonstrated performance, with low power consumption and small form factor, promises a facile and low‐cost suspended graphene/PEDOT: PSS‐PEO sensor solution with enhanced sensitivity.

Tu1631 DEVELOPMENT OF FUNCTIONAL GASTROINTESTINAL DISORDER SYMPTOMS FOLLOWING LAPAROSCOPIC CHOLECYSTECTOMY: A PROPECTIVE COHORT STUDY

Gastroenterology · 2023-05-01

Benchmarking Microscale Ductility Measurements (Final Report of the Project DE-NE0008799)

2023-02-28

Conventional macroscale experimentation is generally considered to be straightforward with few limitations. Conversely, micro/nanoscale experimentation presents numerous challenges in loading device design, sample preparation and handling, as well as accurate understanding of grain size and local texture effects on recorded measurements. Despite these challenges, nanopillar compression, MEMs based micro-tension, and nanoindentation approaches have been able to provide fundamental contributions to the understanding of material behavior at small lengthscales. However, the overarching shortcoming of these micro/nanoscale experimentation approaches, is the inability to directly translate measurements evaluated at the nm and µm length scales (e.g., hardness) to macroscale tensile material behavior (i.e., elastic modulus, yield strength, and ductility). The objectives of the proposed study are, 1) to establish best practices for obtaining tensile microscale ductility measurements, and 2) to validate methodologies to for comparing microscale ductility measurements to macroscale ductility measurements. In order to achieve these objectives, a multi-lengthscale, multi-temperature testing protocol and simulation framework are executed first on copper as a model material to validate the following approach, and second on reactor grade Zircaloy-2. Experiments are conducted on specimens extracted from the same test piece to ensure nominally identical grain size and texture from specimens to specimen. Motivated by the need to isolate the contribution of size-effects on obtained mechanical property measurements, specimens are manufactured with thicknesses at the micro- (1-10 µm), meso- (10-100's µm), and macroscales (sub-sized ASTM E8). In-situ full-field deformation techniques (scanning electron microscopy (SEM) grid methods and optical DIC) are incorporated into testing at each specimen length-scale to capture plasticity localization and evolution. Experimental testing for all specimens is conducted at both room temperature and elevated temperatures to probe the role of thermal activation on plastic deformation accommodation processes. Simulation efforts focus on examining the mechanical behavior of microscale specimens using a finite element approach with explicitly resolved grain morphologies, and an embedded crystal plasticity model. The cost-efficient implementation method allows for the modeling of a statistically significant number of both real (i.e., digital twin) and generated microstructures to obtain an understanding of the interrelationships between specimen microstructure and geometric variables (grain size, texture, specimen geometry, etc.) on microscale mechanical behavior.

Controlled initiation and termination of jetting in near-field electrospinning through voltage-driven surface charge manipulation

Journal of Manufacturing Processes · 2023-02-15 · 9 citations