Electrospinning Technique as a Powerful Tool for the Design of Superhydrophobic Surfaces

Rivero, Pedro J.; Vicente, Adrián; Rodríguez, Rafael

doi:10.5772/intechopen.92688

Cited by 2 publications

(2 citation statements)

References 65 publications

(65 reference statements)

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“…The fiber size distribution depends on the size of the modifier-the smallest when it is gentamicin sulphate, the largest when it is clay (MMT) and modified clay (MMTG). Due to the presence of the filler in the fiber, it is possible to reduce the roughness effect; unfortunately, the specific microstructure of fibrous membranes usually increases the hydrophobicity of such materials, placing them on the border of highly hydrophobic and sometimes even superhydrophobic materials (the contact angle above 150 • ) [41]. The contact angle of the PCL_MMTG membrane also takes an intermediate value between PCL_G and PCL_MMT, which may indicate a homogeneous distribution of the filler in the fiber, which, in combination with the fiber size distribution, reduces the degree of membrane wettability (Figure 5).…”

Section: Discussionmentioning

confidence: 99%

“…Such materials are characterized by a high surface-to-volume ratio, which leads to the improvement of many properties, from chemical to physicochemical and mechanical, and simultaneously allows for a relatively high homogeneity of the material in terms of the presence of the additive in the matrix [37][38][39]. Membranes composed of nanofibers are characterized by high surface energy and often also high hydrophobicity due to the synergistic effect of ultrathin fibers and the nature of the polymer itself [40,41]. By introducing nanoparticles into the matrix of the fiber, the wettability of the surface of fibrous materials can be controlled, as is the case in PCL/HAp or PCL/TCP systems [42].…”

Section: Introductionmentioning

confidence: 99%

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Effects of Montmorillonite and Gentamicin Addition on the Properties of Electrospun Polycaprolactone Fibers

et al. 2021

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Electrospinning was used to obtain multifunctional fibrous composite materials with a matrix of poly-ɛ-caprolactone (PCL) and 2 wt.% addition of a nanofiller: montmorillonite (MMT), montmorillonite intercalated with gentamicin sulphate (MMTG) or gentamicin sulphate (G). In the first stage, the aluminosilicate gallery was modified by introducing gentamicin sulfate into it, and the effectiveness of the intercalation process was confirmed on the basis of changes in the clay particle size from 0.5 µm (for MMT) to 0.8 µm (for MMTG), an increase in the interplanar distance d001 from 12.3 Å (for MMT) to 13.9 Å (for MMTG) and altered clay grain morphology. In the second part of the experiment, the electrospinning process was carried out in which the polymer nonwovens with and without the modifier were prepared directly from dichloromethane (DCM) and N,N-dimethylformamide (DMF). The nanocomposite fibrous membranes containing montmorillonite were prepared from the same polymer solution but after homogenization with the modifier (13 wt.%). The degree of dispersion of the modifier was evaluated by average microarray analysis from observed area (EDS), which was also used to determine the intercalation of montmorillonite with gentamicin sulfate. An increase in the size of the fibers was found for the materials with the presence of the modifier, with the largest diameters measured for PCL_MMT (625 nm), and the smaller ones for PCL_MMTG (578 nm) and PCL_G (512 nm). The dispersion of MMT and MMTG in the PCL fibers was also confirmed by indirect studies such as change in mechanical properties of the nonwovens membrane, where the neat PCL nonwoven was used as a reference material. The addition of the modifier reduced the contact angle of PCL nonwovens (from 120° for PCL to 96° for PCL_G and 98° for PCL_MMTG). An approximately 10% increase in tensile strength of the nonwoven fabric with the addition of MMT compared to the neat PCL nonwoven fabric was also observed. The results of microbiological tests showed antibacterial activity of all obtained materials; however, the inhibition zones were the highest for the materials containing gentamicin sulphate, and the release time of the active substance was significantly extended for the materials with the addition of montmorillonite containing the antibiotic. The results clearly show that the electrospinning technique can be effectively used to obtain nanobiocomposite fibers with the addition of nonintercalated and intercalated montmorillonite with improved strength and increased stiffness compared to materials made only of the polymer fibers, provided that a high filler dispersion in the spinning solution is obtained.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of Montmorillonite and Gentamicin Addition on the Properties of Electrospun Polycaprolactone Fibers

et al. 2021

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Investigation of Different Membrane Porosities on the Permeate Flux of Direct Contact Membrane Distillation

Elrasheedy

Rabie

El-Shazly

et al. 2021

KEM

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In the present study the surface morphology of electrospun fibers at different polystyrene (PS) solution concentration was studied by SEM imaging to determine the best PS solution concentration yielding continuous uniform beadles fibers. Contact angle measurements of the optimum fabricatedPS-18 membrane confirmed the super hydrophobic property of the membrane that exhibited a static water contact angle of 145o. Numerical investigation of the performance of PS-18 membrane at different membrane thicknesses and porosities on direct contact membrane distillation showed that increasing the membrane porosity increases the permeate flux considerably.

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Electrospinning Technique as a Powerful Tool for the Design of Superhydrophobic Surfaces

Cited by 2 publications

References 65 publications

Effects of Montmorillonite and Gentamicin Addition on the Properties of Electrospun Polycaprolactone Fibers

Effects of Montmorillonite and Gentamicin Addition on the Properties of Electrospun Polycaprolactone Fibers

Investigation of Different Membrane Porosities on the Permeate Flux of Direct Contact Membrane Distillation

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