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Abstract
The mechanical properties of electrospun nanofiber membranes are critical for their applications. A clear understanding of the mechanical properties that result from the characteristics of the individual fiber and membrane microstructure is vital in the design of fiber composites. In this reported study, silk fibroin (SF)/polycaprolactone (PCL) composite nanofiber membranes were preparedusing an electrostatic spinning technology. The nanofiber orientation distribution (FOD) of the membrane was analyzed using multi-layer image fusion technology, and the results indicated the presence of an approximately uniform distribution of fibers in the electrospun membranes. The relationship between the single nanofiber and the membrane was established by analyzing the geometrical structure of the cell by employing a representative volume element (RVE) analysis method. The mechanical properties of the 272 nm diameter SF/PCL composite fibers were then predicted using the developed model.
Highlights
Nanomaterials have become a popular research topic in recent years and in this vein, electrospinning has been recognized as an effective method to produce continuous fibers with diameters in the range of several nanometers to several microns
In electrospinning, which is a fascinating electrostatic fiber fabricating technique, a charged jet flow is first produced in the polymers by high-voltage static electricity, and the charged jet flow is thinly stretched in the static electric field
Where, P is the membrane porosity, Vf is the volume of fiber, is the volume of membrane, L is the side length of the square, T is the membrane thickness, r is the fiber radius, N f is the total number of fibers in the representative volume element (RVE), l N f is the length of the Nth fiber, ∆l is tolerances for the fiber length in the RVE
Summary
Nanomaterials have become a popular research topic in recent years and in this vein, electrospinning has been recognized as an effective method to produce continuous fibers with diameters in the range of several nanometers to several microns. The accuracy of these results was verified by a traditional tensile test or theoretical estimation In this way, the authors analyzed the mechanical properties of polyoxyethylene, polyamide, polyimide and many other electrospun nanofibers under tension. A practical analysis is needed that can help predict the mechanical properties, tensile properties of a single nanofiber using known testing parameters In this reported study, nanofiber membranes were produced by electrospinning. The geometric configurations of an idealized nanofiber membrane were analyzed with all the fibers randomly distributed and oriented Based on this analysis, a fiber geometry model was developed that related the tensile strength of the nanofiber membrane to a single nanofiber based on the fiber volume fraction and the dimensions of the test specimen. The results of this study may be very useful in the designing and dictating the desired mechanical properties of nanofiber membranes
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