Surface morphology of electrospun PLA fibers: mechanisms of pore formation

Natarajan, Lakshmi; New, Jackie; Dasari, Aravind; Yu, Suzhu; Manan, Munirah Abdul

doi:10.1039/c4ra06215a

Cited by 68 publications

(56 citation statements)

References 33 publications

(48 reference statements)

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“…It can be inferred from the aforementioned discussion that VIPS leads to the creation of micro/nano roughness. These findings are similar to the recent works by Lu and Xia and Natarajan et al …”

Section: Resultssupporting

confidence: 93%

“…It can be inferred from the aforementioned discussion that VIPS leads to the creation of micro/nano roughness. These findings are similar to the recent works by Lu and Xia 50 and Natarajan et al 51 It is worth mentioning that Figure 7 schematically shows the mechanism of pore formation and does not necessarily emphasize the shape of pores, or even the size and number of vapor molecules.…”

Section: The Mechanism Of the Roughness Formation On Fiber Surface Ansupporting

confidence: 90%

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Developing porous fibers by electrocentrifuge spinning system

Mobasheri

Valipouri

Ravandi

2019

J of Applied Polymer Sci

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In this study, polysulfone fibers with various surface morphologies were developed using electrocentrifuge spinning system. The effects of a number of parameters, including the solvent system, spinning system angular velocity, and relative humidity, on the fiber morphology were studied using field emission scanning electron microscopy, porosimetry [Brunauer–Emmett–Teller (BET)], and contact angle test. The results showed that the fibers prepared from the acetone/dimethylformamide (DMF) solvent system had higher micro/nano roughness than those fabricated from the tetrahydrofuran/DMF solvent system, that is to say, the higher the vapor pressure of the solvent, the higher the surface roughness. The acetone/DMF system created fibers that had internal porosity. Also, the relative humidity had a significant effect on providing micro/nano roughness, so that increasing the relative humidity led to an increase in the surface roughness. The increase in the angular velocity caused to stretch the micro/nano patterns and increase the fiber diameter. The results of the BET confirmed the microscopic observations. With the increase in the relative humidity and the use of the acetone/DMF system, porosity, and specific surface area of the fiber increased. X‐ray diffraction analysis was also performed and it was found that the presence of moisture did not affect the crystallinity of the fibers. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47513.

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Section: Resultssupporting

confidence: 93%

Section: The Mechanism Of the Roughness Formation On Fiber Surface Ansupporting

confidence: 90%

Developing porous fibers by electrocentrifuge spinning system

Mobasheri

Valipouri

Ravandi

2019

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

“…A combination of solvent and non-solvent (or poor solvent) has also been used to induce porosity in PLA fibres. When studying a ternary system composed of PLA/DCM/DMF, Natarajan and co-workers [37] found that the addition of DMF (10 % v/v) resulted in surface porosity. Similar systems have been used to produce porous PLA fibres by Li et al [16].…”

Section: Introductionmentioning

confidence: 99%

Fabricating porous poly(lactic acid) fibres via electrospinning

Huang

Thomas

2018

European Polymer Journal

155

115

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In this paper, amorphous poly(lactic acid) (PLA), a biodegradable polymer with excellent biocompatibility, is successfully electrospun into micron-sized fibres with controlled surface and internal morphologies. By careful solvent selection, either surface porosity or internal porosity can be achieved through different mechanisms. Use of chloroform as the solvent gives rise to circular pores of 100 nm diameter confined to the surface. These are obtained in humid conditions by the so-called 'Breath Figure' mechanism. It is found that combining chloroform with a water-miscible non-solvent yields either surface porosity (wrinkled effect) using a low boiling point liquid, e.g. ethanol, or internal porosity using a high boiling point liquid, e.g. dimethyl sulphoxide (DMSO). Both these microstructures are obtained through a non-solvent induced phase separation (NIPS) mechanism. Finally, it is found possible to produce both surface and internal porosity using DMSO by a vapour induced phase separation (VIPS) mechanism. The porous electrospun PLA mats were shown to exhibit significantly increased oil absorption capacity compared with the non-porous fibre mats.

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“…In the electrospinning process, the environment of jet volatilization is relatively dry. 23,[27][28][29] Chloroform mixed with chloroform ethanol is used as a solvent. Ethanol is a volatile nonsolvent for PLA.…”

Section: Preparation Of Microspheresmentioning

confidence: 99%

Research on electrospinning three‐branched‐chain PLA porous microspheres and adsorption for silver ions

Shen

Zhang

et al. 2018

J of Applied Polymer Sci

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The objective of the present study was to prepare poly(lactic acid) (PLA) porous microspheres. Special attention was paid to the effects of improving the surface hydrophilicity of the microspheres on the adsorption of silver ions. The linear PLA and the three‐branched‐chain PLA microspheres with pores or without pores were obtained by electrospinning. The morphology, hydrophilicity, and silver ion adsorption of the microspheres were investigated, and the antibacterial properties of microspheres with adsorbed silver ions were studied. The research showed that the three‐branched‐chain PLA porous microspheres had good hydrophilicity and strong adsorption ability of silver ions. Using X‐ray photoelectron spectroscopy and scanning electron microscopy, it is found that the microspheres can adsorb more silver ions with an increase in holes. However, the multihydroxyl structure of the three‐branched‐chain PLA has strong hydrophilicity. It has a better phase separation ability to obtain the porous structures easily. In aqueous solution, these microspheres are more likely to adsorb drugs with positive charge, and the size of the microspheres is controlled in the solvent with different dielectric constants. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46735.

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Surface morphology of electrospun PLA fibers: mechanisms of pore formation

Abstract: Interaction of relative humidity with solvent(s) is relatively more important in obtaining surface pores than solvent volatility and phase separation.

Cited by 68 publications

References 33 publications

Developing porous fibers by electrocentrifuge spinning system

Developing porous fibers by electrocentrifuge spinning system

Fabricating porous poly(lactic acid) fibres via electrospinning

Research on electrospinning three‐branched‐chain PLA porous microspheres and adsorption for silver ions

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