3-Arm star pyrene-functional PMMAs for efficient exfoliation of graphite in chloroform: fabrication of graphene-reinforced fibrous veils

Γκερμπούρα, Σάνδρα; Papadimitriou, K.; Skountzos, Emmanuel N.; Polyzos, Ioannis; Carbone, Maria Giovanna Pastore; Κοτρώτσος, Αθανάσιος; Mavrantzas, Vlasis G.; Galiotis, Costas; Tsitsilianis, Constantinos

doi:10.1039/c8nr06888g

Cited by 19 publications

(18 citation statements)

References 65 publications

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“…All scaffold types exhibited typical yield behavior. An analogous behavior was also observed in [28] and in [43], in which Poly(methyl methacrylate) (PMMA) and SP scaffolds were fabricated and tested under the same conditions. Bar charts of Figure 8A-E provide average values of the apparent E, σ max , ε max (%), σ y , and ε y (%) respectively.…”

Section: Mechanical Propertiessupporting

confidence: 61%

“…Thus, nanofillers' inclusion contributed to electrostatic charge build up during SEP. Finally, the quite large SSD values are common in electrospinning technique [28,43] as small changes of the electric field occur during the phenomenon. Apart from SEM examination of the fabricated PEI scaffolds, TEM examination was also conducted (see Figure 5B).…”

Section: Structural and Morphological Analysismentioning

confidence: 99%

“…PEI polymer has been studied so far, for its biocompatibility and has shown that allows the attachment and growth of cells [25,26]. For further improvement of mechanical and cellular performance of electrospun structures, GNPs and HAP inclusions have been incorporated into polymer fibers and further investigated [27,28]. Repanas et al in [29], utilized multi-walled carbon nanotubes (MWCNTs) for fibers' reinforcement.…”

Section: Introductionmentioning

confidence: 99%

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Fabrication and Characterization of Polyetherimide Electrospun Scaffolds Modified with Graphene Nano-Platelets and Hydroxyapatite Nano-Particles

Kostopoulos

Κοτρώτσος

Fouriki

et al. 2020

IJMS

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Solution electrospinning process (SEP) is a versatile technique for generating non-woven fibrous materials intended to a wide range of applications. One of them is the production of fibrous and porous scaffolds aiming to mimic bone tissue, as artificial extracellular matrices (ECM). In the present work, pure and nano-modified electrospun polyetherimide (PEI) scaffolds have been successfully fabricated. The nano-modified ones include (a) graphene nano-platelets (GNPs), (b) hydroxyapatite (HAP), and (c) mixture of both. After fabrication, the morphological characteristics of these scaffolds were revealed by using scanning electron (SEM) and transmission electron (TEM) microscopies, while porosity and mean fiber diameter were also calculated. In parallel, contact angle experiments were conducted so that the hydrophilicity level of these materials to be determined. Finally, the mechanical performance of the fabricated scaffolds was investigated by conducting uniaxial tensile tests. Ιn future work, the fabricated scaffolds will be further utilized for investigation as potential candidate materials for cell culture with perspective in orthopedic applications.

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Section: Mechanical Propertiessupporting

confidence: 61%

Section: Structural and Morphological Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fabrication and Characterization of Polyetherimide Electrospun Scaffolds Modified with Graphene Nano-Platelets and Hydroxyapatite Nano-Particles

Kostopoulos

Κοτρώτσος

Fouriki

et al. 2020

IJMS

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“…In the case of scaffolds modified with HAP, it was shown that by increasing the HAP concentration the tensile properties were enhanced even if the aggregate presence is made stronger by increasing the HAP concentration (see in Figure 4 A,B). Similar findings were also observed in Kostopoulos et al’s [ 30 ] and Gkermpoura et al’s [ 38 ] investigations, in which various scaffolds were nanomodified with various nanoparticles. In Figure 8 , a snapshot of the tensile testing is illustrated, indicated the ductile nature of the precise PLA scaffolds.…”

Section: Resultssupporting

confidence: 90%

Fabrication and Characterization of Polylactic Acid Electrospun Scaffolds Modified with Multi-Walled Carbon Nanotubes and Hydroxyapatite Nanoparticles

2020

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The solution electrospinning process (SEP) is a cost-effective technique in which a wide range of polymeric materials can be electrospun. Electrospun materials can also be easily modified during the solution preparation process (prior SEP). Based on this, the aim of the current work is the fabrication and nanomodification of scaffolds using SEP, and the investigation of their porosity and physical and mechanical properties. In this study, polylactic acid (PLA) was selected for scaffold fabrication, and further modified with multi-walled carbon nanotubes (MWCNTs) and hydroxyapatite (HAP) nanoparticles. After fabrication, porosity calculation and physical and mechanical characterization for all scaffold types were conducted. More precisely, the morphology of the fibers (in terms of fiber diameter), the surface properties (in terms of contact angle) and the mechanical properties under the tensile mode of the fabricated scaffolds have been investigated and further compared against pristine PLA scaffolds (without nanofillers). Finally, the scaffold with the optimal properties was proposed as the candidate material for potential future cell culturing.

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“…GNPs can be obtained by using different methods. These methods involve mechanical and/or chemical exfoliation of graphite [21,25,26].…”

Section: Introductionmentioning

confidence: 99%

Graphene Nanoplatelet- and Hydroxyapatite-Doped Supramolecular Electrospun Fibers as Potential Materials for Tissue Engineering and Cell Culture

Kostopoulos

Κοτρώτσος

Fouriki

2019

IJMS

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Porous and fibrous artificial extracellular matrices (ECM) called scaffolds are considered to be promising avenues of research in the field of biomedical engineering, including tissue fabrication through cell culture. The current work deals with the fabrication of new matrix-type scaffolds through electrospinning, in order to support future three-dimensional tissue formation. The selected material for the fabrication of these scaffolds was a supramolecular polymer (SP) that is based on ureiodypyrimidone hydrogen bonding units (UPy). More precisely, pure SP and modified electrospun scaffolds with (a) graphene nanoplatelets (GNPs), (b) hydroxyapatite (HA), and (c) a mixture of both were fabricated for the needs of the current study. The aim of this work is to engineer and to characterize SP electrospun scaffolds (with and without fillers) and study whether the introduction of the fillers improve the physical and mechanical properties of them. The obtained results indicate that doping the SP scaffolds with GNPs led to improved apparent mechanical properties while HA seems to slightly deteriorate them. For all cases, doping provided thinner fibers with a more hydrophilic surface. Taking together, these types of SP scaffolds can be further studied as potential candidate for cell culture.

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3-Arm star pyrene-functional PMMAs for efficient exfoliation of graphite in chloroform: fabrication of graphene-reinforced fibrous veils

Abstract: Stable graphene dispersions in chloroform, using very low pyrene-functionalized polymer/graphite mass ratio.

Cited by 19 publications

References 65 publications

Fabrication and Characterization of Polyetherimide Electrospun Scaffolds Modified with Graphene Nano-Platelets and Hydroxyapatite Nano-Particles

Fabrication and Characterization of Polyetherimide Electrospun Scaffolds Modified with Graphene Nano-Platelets and Hydroxyapatite Nano-Particles

Fabrication and Characterization of Polylactic Acid Electrospun Scaffolds Modified with Multi-Walled Carbon Nanotubes and Hydroxyapatite Nanoparticles

Graphene Nanoplatelet- and Hydroxyapatite-Doped Supramolecular Electrospun Fibers as Potential Materials for Tissue Engineering and Cell Culture

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