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Tuning surface texture of electrospun polycaprolactone fibers: Effects of solvent systems and relative humidity

Published online by Cambridge University Press:  31 January 2020

Murat Şimşek
Murat Şimşek*
Affiliation:
Department of Biomedical Engineering, Inonu University, Malatya 44280, Turkey
*
a)Address all correspondence to this author. e-mail: murat.simsek@inonu.edu.tr
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Abstract

In this study, the surface morphology of electrospun polycaprolactone (PCL) fibers was investigated. PCL was dissolved in various solvent/nonsolvent systems (acetone/dimethylformamide (DMF), tetrahydrofuran (THF)/DMF, dichloromethane (DCM)/DMF, chloroform (CF)/DMF, acetone/dimethyl sulfoxide (DMSO), THF/DMSO, DCM/DMSO, CF/DMSO) at a fixed ratio of 80/20 v/v. PCL solutions from these solvent systems were electrospun under varying high relative humidity (60–90%), and also room humidity. Characterization of fibers was evaluated by a scanning electron microscope, an atomic force microscope, water contact angle measurements, the Brunauer–Emmett–Teller method, and a strain–stress test. Results revealed that the surface texture of individual fibers changed with the presence of different types of pores and surface roughness depending on both humidity and solvent/nonsolvent properties. Miscibility with water was another factor to be taken into account for understanding mechanisms that contributed to the formation of surface defects. Fibrous materials having such a surface architecture, especially the porous ones, are potential candidates for various applications such as tissue engineering, drug delivery, catalysis, and filtration.

Keywords

surface topographyporous PCL fiberselectrospinninghumidity
Type
Article
Information
Journal of Materials Research , Volume 35 , Issue 3 , 14 February 2020 , pp. 332 - 342
Copyright
Copyright © Materials Research Society 2020

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