Size‐Dependent Elastic Modulus and Core–Shell Structural Characteristics of Electrospun Nanofibers

Munawar M, Nilsson F, Schubert DW (2025)

Publication Type: Journal article

Publication year: 2025

Journal

Macromolecular Bioscience Wiley-VCH Verlag

Article Number: e00280

DOI: 10.1002/mabi.202500280

Abstract

This study investigates the size-dependent mechanical properties of electrospun polycaprolactone (PCL) nanofibers by analyzing the relationship between fiber diameter and Young's modulus. Experimental data reveal a clear inverse trend: as fiber diameter decreases, stiffness increases significantly, indicating strong surface and confinement effects at the nanoscale. Two theoretical models were employed to interpret the observed behavior: a simplified core–shell model (Model 1) and an extended model (Model 2) incorporating surface tension and curvature elasticity. Both models accurately fit the experimental data across a diameter range of 450–850 nm, with Model 2 providing slightly better agreement at intermediate diameters (∼600–750 nm), where surface mechanics become more prominent. The enhanced stiffness in thinner fibers is attributed to increased surface-to-volume ratio and tighter molecular packing, while larger fibers exhibit bulk-dominated mechanical responses. These findings highlight the importance of nanoscale geometry and surface effects in determining mechanical properties and suggest that fiber stiffness can be systematically tuned via diameter control during electrospinning.

Authors with CRIS profile

Muhammad Munawar Lehrstuhl für Werkstoffwissenschaften (Polymerwerkstoffe) (LSP) Dirk Schubert Lehrstuhl für Werkstoffwissenschaften (Polymerwerkstoffe) (LSP)

Involved external institutions

Royal Institute of Technology / Kungliga Tekniska Högskolan (KTH) SE Sweden (SE)

How to cite

APA:

Munawar, M., Nilsson, F., & Schubert, D.W. (2025). Size‐Dependent Elastic Modulus and Core–Shell Structural Characteristics of Electrospun Nanofibers. Macromolecular Bioscience. https://doi.org/10.1002/mabi.202500280

MLA:

Munawar, Muhammad, Fritjof Nilsson, and Dirk W. Schubert. "Size‐Dependent Elastic Modulus and Core–Shell Structural Characteristics of Electrospun Nanofibers." Macromolecular Bioscience (2025).

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