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Ünlü BA, Akkoyun S, Karatay A, Ates A, Elmali A. Controlled plasmon-induced nonlinear absorption and optical limiting in Al/PVP composite nanofibers. NANOSCALE 2023; 15:19229-19237. [PMID: 37987611 DOI: 10.1039/d3nr03859a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2023]
Abstract
The effect of aluminum (Al) concentration on the surface plasmon resonance (SPR) band position of aluminum/polyvinylpyrrolidone (Al/PVP) composite nanofibers was investigated to strengthen nonlinear absorption (NLA) and widen its spectral range. With increasing Al content in PVP nanofibers, the SPR band was shifted towards excitation wavelength and an improved NLA response was achieved. The NLA response was examined both experimentally, by conducting Z-scan experiments, and theoretically, using two models. In the first model, the contributions of one-photon absorption (OPA), two-photon absorption (TPA), excited state absorption (ESA) and saturated absorption (SA) are considered. The second model, on the other hand, is a model that is widely used in the literature, and while taking into account the contributions of OPA and TPA, it neglects the ESA. The first model provides more accurate results due to the high concentration of free carriers in the samples examined. In order to reveal the contribution of Al to the nonlinear absorption, a laser excitation wavelength of 532 nm was chosen to minimize both the defect-assisted sequential and genuine two-photon absorption contributions of PVP. While the nonlinear absorption of pure PVP is quite weak, the NLA performance of Al/PVP nanofibers significantly improved as the Al content increased. As the amount of Al increased, the aggregation effect increased and a broadening and red shift in the SPR band were observed in the plasmonic behavior. This indicates a decreasing interparticle distance in Al particles. The sample with the highest amount of Al is anticipated as a potential candidate for optical limiting (OL) applications due to its superior NLA performance and SPR band furthest towards the near infrared (NIR) region, allowing a wider range of wavelength set to be used in OL applications.
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Affiliation(s)
- Bekir Asilcan Ünlü
- Department of Engineering Physics, Faculty of Engineering, Ankara University, 06100 Ankara, Türkiye.
| | - Serife Akkoyun
- Department of Metallurgical and Materials Engineering, Faculty of Engineering and Natural Sciences, Ankara Yildirim Beyazit University, 06010 Ankara, Türkiye.
- Central Research Laboratory, Application and Research Center, Ankara Yildirim Beyazit University, 06010 Ankara, Türkiye
| | - Ahmet Karatay
- Department of Engineering Physics, Faculty of Engineering, Ankara University, 06100 Ankara, Türkiye.
| | - Aytunc Ates
- Department of Metallurgical and Materials Engineering, Faculty of Engineering and Natural Sciences, Ankara Yildirim Beyazit University, 06010 Ankara, Türkiye.
| | - Ayhan Elmali
- Department of Engineering Physics, Faculty of Engineering, Ankara University, 06100 Ankara, Türkiye.
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2
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Mamun A, Kiari M, Sabantina L. A Recent Review of Electrospun Porous Carbon Nanofiber Mats for Energy Storage and Generation Applications. MEMBRANES 2023; 13:830. [PMID: 37888002 PMCID: PMC10608773 DOI: 10.3390/membranes13100830] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2023] [Revised: 09/28/2023] [Accepted: 10/12/2023] [Indexed: 10/28/2023]
Abstract
Electrospun porous carbon nanofiber mats have excellent properties, such as a large surface area, tunable porosity, and excellent electrical conductivity, and have attracted great attention in energy storage and power generation applications. Moreover, due to their exceptional properties, they can be used in dye-sensitized solar cells (DSSCs), membrane electrodes for fuel cells, catalytic applications such as oxygen reduction reactions (ORRs), hydrogen evolution reactions (HERs), and oxygen evolution reactions (OERs), and sensing applications such as biosensors, electrochemical sensors, and chemical sensors, providing a comprehensive insight into energy storage development and applications. This study focuses on the role of electrospun porous carbon nanofiber mats in improving energy storage and generation and contributes to a better understanding of the fabrication process of electrospun porous carbon nanofiber mats. In addition, a comprehensive review of various alternative preparation methods covering a wide range from natural polymers to synthetic carbon-rich materials is provided, along with insights into the current literature.
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Affiliation(s)
- Al Mamun
- Junior Research Group “Nanomaterials”, Faculty of Engineering and Mathematics, Bielefeld University of Applied Sciences and Arts, 33619 Bielefeld, Germany
| | - Mohamed Kiari
- Department of Physical Chemistry, Institute of Materials, University of Alicante, 03080 Alicante, Spain
| | - Lilia Sabantina
- Faculty of Apparel Engineering and Textile Processing, Berlin University of Applied Sciences—HTW Berlin, Hochschule für Technik und Wirtschaft Berlin, 12459 Berlin, Germany
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Langwald SV, Ehrmann A, Sabantina L. Measuring Physical Properties of Electrospun Nanofiber Mats for Different Biomedical Applications. MEMBRANES 2023; 13:488. [PMID: 37233549 PMCID: PMC10220787 DOI: 10.3390/membranes13050488] [Citation(s) in RCA: 12] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2023] [Revised: 04/26/2023] [Accepted: 04/27/2023] [Indexed: 05/27/2023]
Abstract
Electrospun nanofiber mats are nowadays often used for biotechnological and biomedical applications, such as wound healing or tissue engineering. While most studies concentrate on their chemical and biochemical properties, the physical properties are often measured without long explanations regarding the chosen methods. Here, we give an overview of typical measurements of topological features such as porosity, pore size, fiber diameter and orientation, hydrophobic/hydrophilic properties and water uptake, mechanical and electrical properties as well as water vapor and air permeability. Besides describing typically used methods with potential modifications, we suggest some low-cost methods as alternatives in cases where special equipment is not available.
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Affiliation(s)
- Sarah Vanessa Langwald
- Faculty of Engineering and Mathematics, Bielefeld University of Applied Sciences and Arts, 33619 Bielefeld, Germany;
| | - Andrea Ehrmann
- Faculty of Engineering and Mathematics, Bielefeld University of Applied Sciences and Arts, 33619 Bielefeld, Germany;
| | - Lilia Sabantina
- Faculty of Clothing Technology and Garment Engineering, School of Culture + Design, HTW Berlin—University of Applied Sciences, 12459 Berlin, Germany
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Blachowicz T, Ehrmann A. Optical Properties of Electrospun Nanofiber Mats. MEMBRANES 2023; 13:441. [PMID: 37103868 PMCID: PMC10146296 DOI: 10.3390/membranes13040441] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/02/2023] [Revised: 04/15/2023] [Accepted: 04/17/2023] [Indexed: 06/19/2023]
Abstract
Electrospun nanofiber mats are usually applied in fields where their high specific surface area and small pore sizes are important, such as biotechnology or filtration. Optically, they are mostly white due to scattering from the irregularly distributed, thin nanofibers. Nevertheless, their optical properties can be modified and become highly important for different applications, e.g., in sensing devices or solar cells, and sometimes for investigating their electronic or mechanical properties. This review gives an overview of typical optical properties of electrospun nanofiber mats, such as absorption and transmission, fluorescence and phosphorescence, scattering, polarized emission, dyeing and bathochromic shift as well as the correlation with dielectric constants and the extinction coefficient, showing which effects may occur and can be measured by which instruments or used for different applications.
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Affiliation(s)
- Tomasz Blachowicz
- Center for Science and Education, Institute of Physics, Silesian University of Technology, 44-100 Gliwice, Poland
| | - Andrea Ehrmann
- Faculty of Engineering and Mathematics, Bielefeld University of Applied Sciences, 33619 Bielefeld, Germany
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Uhljar LÉ, Alshweiat A, Katona G, Chung M, Radacsi N, Kókai D, Burián K, Ambrus R. Comparison of Nozzle-Based and Nozzle-Free Electrospinning for Preparation of Fast-Dissolving Nanofibers Loaded with Ciprofloxacin. Pharmaceutics 2022; 14:pharmaceutics14081559. [PMID: 36015184 PMCID: PMC9413034 DOI: 10.3390/pharmaceutics14081559] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2022] [Revised: 07/21/2022] [Accepted: 07/26/2022] [Indexed: 11/16/2022] Open
Abstract
The study aimed to prepare ciprofloxacin-loaded polyvinylpyrrolidone electrospun nanofibers for oral drug delivery, using a conventional nozzle-based and a lab-built nozzle-free electrospinning equipment. To produce nanofibers, electrospinning is the process most often used. However, from the industry’s point of view, conventional electrospinning does not have sufficiently high productivity. By omitting the nozzle, productivity can be increased, and so the development of nozzle-free processes is worthwhile. In this study, a solution of ciprofloxacin and polyvinylpyrrolidone was electrospun under similar conditions, using both single-nozzle and nozzle-free methods. The two electrospinning methods were compared by investigating the morphological and physicochemical properties, homogeneity, in vitro drug release, and cytotoxicity. The stability of the nanofibers was monitored from different aspects in a 26 month stability study. The results showed that the use of the nozzle-free electrospinning was preferable due to a higher throughput, improved homogeneity, and the enhanced stability of nanofiber mats, compared to the nozzle-based method. Nevertheless, fast dissolving nanofibers loaded with poorly water-soluble ciprofloxacin were produced by both electrospinning methods. The beneficial properties of these nanofibers can be exploited in innovative drug development; e.g., nanofibers can be formulated into orodispersible films or per os tablets.
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Affiliation(s)
- Luca Éva Uhljar
- Faculty of Pharmacy, Interdisciplinary Excellence Centre, Institute of Pharmaceutical Technology and Regulatory Affairs, University of Szeged, Eötvös Street 6, 6720 Szeged, Hungary; (L.É.U.); (G.K.)
| | - Areen Alshweiat
- Department of Pharmaceutics and Pharmaceutical Technology, Faculty of Pharmaceutical Sciences, The Hashemite University, Zarqa 13133, Jordan;
| | - Gábor Katona
- Faculty of Pharmacy, Interdisciplinary Excellence Centre, Institute of Pharmaceutical Technology and Regulatory Affairs, University of Szeged, Eötvös Street 6, 6720 Szeged, Hungary; (L.É.U.); (G.K.)
| | - Michael Chung
- School of Engineering, Institute for Materials and Processes, The University of Edinburgh, King’s Buildings, Edinburgh EH9 3FB, UK; (M.C.); (N.R.)
| | - Norbert Radacsi
- School of Engineering, Institute for Materials and Processes, The University of Edinburgh, King’s Buildings, Edinburgh EH9 3FB, UK; (M.C.); (N.R.)
| | - Dávid Kókai
- Department of Medical Microbiology and Immunobiology, University of Szeged, Dóm Square 10, 6720 Szeged, Hungary; (D.K.); (K.B.)
| | - Katalin Burián
- Department of Medical Microbiology and Immunobiology, University of Szeged, Dóm Square 10, 6720 Szeged, Hungary; (D.K.); (K.B.)
| | - Rita Ambrus
- Faculty of Pharmacy, Interdisciplinary Excellence Centre, Institute of Pharmaceutical Technology and Regulatory Affairs, University of Szeged, Eötvös Street 6, 6720 Szeged, Hungary; (L.É.U.); (G.K.)
- Correspondence:
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Jankauskaite L, Malinauskas M, Aukstikalne L, Dabasinskaite L, Rimkunas A, Mickevicius T, Pockevičius A, Krugly E, Martuzevicius D, Ciuzas D, Baniukaitiene O, Usas A. Functionalized Electrospun Scaffold-Human-Muscle-Derived Stem Cell Construct Promotes In Vivo Neocartilage Formation. Polymers (Basel) 2022; 14:polym14122498. [PMID: 35746068 PMCID: PMC9229929 DOI: 10.3390/polym14122498] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2022] [Revised: 06/15/2022] [Accepted: 06/17/2022] [Indexed: 02/05/2023] Open
Abstract
Polycaprolactone (PCL) is a non-cytotoxic, completely biodegradable biomaterial, ideal for cartilage tissue engineering. Despite drawbacks such as low hydrophilicity and lack of functional groups necessary for incorporating growth factors, it provides a proper environment for different cells, including stem cells. In our study, we aimed to improve properties of scaffolds for better cell adherence and cartilage regeneration. Thus, electrospun PCL–scaffolds were functionalized with ozone and loaded with TGF-β3. Together, human-muscle-derived stem cells (hMDSCs) were isolated and assessed for their phenotype and potential to differentiate into specific lineages. Then, hMDSCs were seeded on ozonated (O) and non-ozonated (“naïve” (NO)) scaffolds with or without protein and submitted for in vitro and in vivo experiments. In vitro studies showed that hMDSC and control cells (human chondrocyte) could be tracked for at least 14 days. We observed better proliferation of hMDSCs in O scaffolds compared to NO scaffolds from day 7 to day 28. Protein analysis revealed slightly higher expression of type II collagen (Coll2) on O scaffolds compared to NO on days 21 and 28. We detected more pronounced formation of glycosaminoglycans in the O scaffolds containing TGF-β3 and hMDSC compared to NO and scaffolds without TGF-β3 in in vivo animal experiments. Coll2-positive extracellular matrix was observed within O and NO scaffolds containing TGF-β3 and hMDSC for up to 8 weeks after implantation. These findings suggest that ozone-treated, TGF-β3-loaded scaffold with hMDSC is a promising tool in neocartilage formation.
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Affiliation(s)
- Lina Jankauskaite
- Institute of Physiology and Pharmacology, Lithuanian University of Health Sciences, LT-49264 Kaunas, Lithuania; (M.M.); (L.A.); (A.R.); (T.M.); (A.U.)
- Correspondence:
| | - Mantas Malinauskas
- Institute of Physiology and Pharmacology, Lithuanian University of Health Sciences, LT-49264 Kaunas, Lithuania; (M.M.); (L.A.); (A.R.); (T.M.); (A.U.)
| | - Lauryna Aukstikalne
- Institute of Physiology and Pharmacology, Lithuanian University of Health Sciences, LT-49264 Kaunas, Lithuania; (M.M.); (L.A.); (A.R.); (T.M.); (A.U.)
| | - Lauryna Dabasinskaite
- Faculty of Chemical Technology, Kaunas University of Technology, LT-44029 Kaunas, Lithuania; (L.D.); (E.K.); (D.M.); (D.C.); (O.B.)
| | - Augustinas Rimkunas
- Institute of Physiology and Pharmacology, Lithuanian University of Health Sciences, LT-49264 Kaunas, Lithuania; (M.M.); (L.A.); (A.R.); (T.M.); (A.U.)
| | - Tomas Mickevicius
- Institute of Physiology and Pharmacology, Lithuanian University of Health Sciences, LT-49264 Kaunas, Lithuania; (M.M.); (L.A.); (A.R.); (T.M.); (A.U.)
| | - Alius Pockevičius
- Pathology Center, Department of Veterinary Pathobiology, Veterinary Academy, Lithuanian University of Health Sciences, LT-47181 Kaunas, Lithuania;
| | - Edvinas Krugly
- Faculty of Chemical Technology, Kaunas University of Technology, LT-44029 Kaunas, Lithuania; (L.D.); (E.K.); (D.M.); (D.C.); (O.B.)
| | - Dainius Martuzevicius
- Faculty of Chemical Technology, Kaunas University of Technology, LT-44029 Kaunas, Lithuania; (L.D.); (E.K.); (D.M.); (D.C.); (O.B.)
| | - Darius Ciuzas
- Faculty of Chemical Technology, Kaunas University of Technology, LT-44029 Kaunas, Lithuania; (L.D.); (E.K.); (D.M.); (D.C.); (O.B.)
| | - Odeta Baniukaitiene
- Faculty of Chemical Technology, Kaunas University of Technology, LT-44029 Kaunas, Lithuania; (L.D.); (E.K.); (D.M.); (D.C.); (O.B.)
| | - Arvydas Usas
- Institute of Physiology and Pharmacology, Lithuanian University of Health Sciences, LT-49264 Kaunas, Lithuania; (M.M.); (L.A.); (A.R.); (T.M.); (A.U.)
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7
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Electrospinning for the Modification of 3D Objects for the Potential Use in Tissue Engineering. TECHNOLOGIES 2022. [DOI: 10.3390/technologies10030066] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Electrospinning is often investigated for biotechnological applications, such as tissue engineering and cell growth in general. In many cases, three-dimensional scaffolds would be advantageous to prepare tissues in a desired shape. Some studies thus investigated 3D-printed scaffolds decorated with electrospun nanofibers. Here, we report on the influence of 3D-printed substrates on fiber orientation and diameter of a nanofiber mat, directly electrospun on conductive and isolating 3D-printed objects, and show the effect of shadowing, taking 3D-printed ears with electrospun nanofiber mats as an example for potential and direct application in tissue engineering in general.
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Investigation of the Morphological Structure of Needle-Free Electrospun Magnetic Nanofiber Mats. MAGNETOCHEMISTRY 2022. [DOI: 10.3390/magnetochemistry8020025] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Electrospun magnetic nanofibers are promising for a variety of applications in biomedicine, energy storage, filtration or spintronics. The surface morphology of nanofiber mats plays an important role for defined application areas. In addition, the distribution of magnetic particles in nanofibers exerts an influence on the final properties of nanofiber mats. A simple method for the production of magnetic nanofiber mats by the addition of magnetic nanoparticles in an electrospinning polymer solution was used in this study. In this work, magnetic nanofibers (MNFs) were prepared by needle-free electrospinning technique from poly(acrylonitrile) (PAN) in the low-toxic solvent dimethylsulfoxide (DMSO) and 20 wt% Fe3O4 at different parameter conditions such as PAN concentration, voltage and ultrasonic bath. The distribution of nanoparticles in the fiber matrix was investigated as well as the chemical and morphological properties of the resulting magnetic nanofibers. In addition, the surface morphology of magnetic nanofiber mats was studied by confocal laser scanning microscope (CLSM), scanning electron microscope (SEM), Fourier transform infrared microscope (FTIR) and ImageJ software, and distribution of Fe3O4 particles in the matrix was investigated by energy dispersive X-ray spectroscopy (EDX).
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Trabelsi M, Mamun A, Klöcker M, Moulefera I, Pljonkin A, Elleuch K, Sabantina L. Magnetic Carbon Nanofiber Mats for Prospective Single Photon Avalanche Diode (SPAD) Sensing Applications. SENSORS (BASEL, SWITZERLAND) 2021; 21:7873. [PMID: 34883875 PMCID: PMC8659674 DOI: 10.3390/s21237873] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/27/2021] [Revised: 11/12/2021] [Accepted: 11/19/2021] [Indexed: 11/16/2022]
Abstract
Electrospinning enables simple and cost-effective production of magnetic nanofibers by adding nanoparticles to a polymer solution. In order to increase the electrical conductivity of such nanofibers, the carbonization process is crucial. In this study, the chemical and morphological properties of magnetic nanofiber mats prepared from polyacrylonitrile (PAN)/magnetite were investigated. In our previous studies, PAN/magnetite nanofiber mats were carbonized at 500 °C, 600 °C, and 800 °C. Here, PAN/magnetite nanofiber mats were carbonized at 1000 °C. The surface morphology of these PAN/magnetite nanofiber mats is not significantly different from nanofiber mats thermally treated at 800 °C and have remained relatively flexible at 1000 °C, which can be advantageous for various application fields. The addition of nanoparticles increased the average fiber diameter compared to pure PAN nanofiber mats and improved the dimensional stability during thermal processes. The high conductivity, the high magnetization properties, as well as shielding against electromagnetic interference of such carbonized nanofibers can be proposed for use in single photon avalanche diode (SPAD), where these properties are advantageous.
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Affiliation(s)
- Marah Trabelsi
- Ecole Nationale d’Ingénieurs de Sfax, Laboratory LGME, University of Sfax, Sfax 3038, Tunisia; (M.T.); (K.E.)
| | - Al Mamun
- Junior Research Group “Nanomaterials”, Faculty of Engineering and Mathematics, Bielefeld University of Applied Sciences, 33619 Bielefeld, Germany;
| | - Michaela Klöcker
- Faculty of Engineering and Mathematics, Bielefeld University of Applied Sciences, 33619 Bielefeld, Germany;
| | - Imane Moulefera
- L.M.A.E. Laboratory, Department of Process Engineering, Faculty of Science and Technology, University of Mustapha Stambouli, Mascara 29000, Algeria;
| | - Anton Pljonkin
- Institute of Computer Technology and Information Security, Southern Federal University (SFedU), 347900 Taganrog, Russia;
| | - Khaled Elleuch
- Ecole Nationale d’Ingénieurs de Sfax, Laboratory LGME, University of Sfax, Sfax 3038, Tunisia; (M.T.); (K.E.)
| | - Lilia Sabantina
- Junior Research Group “Nanomaterials”, Faculty of Engineering and Mathematics, Bielefeld University of Applied Sciences, 33619 Bielefeld, Germany;
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Electrospun Nanofibrous Membranes for Tissue Engineering and Cell Growth. APPLIED SCIENCES-BASEL 2021. [DOI: 10.3390/app11156929] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
In biotechnology, the field of cell cultivation is highly relevant. Cultivated cells can be used, for example, for the development of biopharmaceuticals and in tissue engineering. Commonly, mammalian cells are grown in bioreactors, T-flasks, well plates, etc., without a specific substrate. Nanofibrous mats, however, have been reported to promote cell growth, adhesion, and proliferation. Here, we give an overview of the different attempts at cultivating mammalian cells on electrospun nanofiber mats for biotechnological and biomedical purposes. Starting with a brief overview of the different electrospinning methods, resulting in random or defined fiber orientations in the nanofiber mats, we describe the typical materials used in cell growth applications in biotechnology and tissue engineering. The influence of using different surface morphologies and polymers or polymer blends on the possible application of such nanofiber mats for tissue engineering and other biotechnological applications is discussed. Polymer blends, in particular, can often be used to reach the required combination of mechanical and biological properties, making such nanofiber mats highly suitable for tissue engineering and other biotechnological or biomedical cell growth applications.
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Mamun A, Blachowicz T, Sabantina L. Electrospun Nanofiber Mats for Filtering Applications-Technology, Structure and Materials. Polymers (Basel) 2021; 13:1368. [PMID: 33922156 PMCID: PMC8122750 DOI: 10.3390/polym13091368] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2021] [Revised: 04/16/2021] [Accepted: 04/20/2021] [Indexed: 12/12/2022] Open
Abstract
Air pollution is one of the biggest health and environmental problems in the world and a huge threat to human health on a global scale. Due to the great impact of respiratory viral infections, chronic obstructive pulmonary disease, lung cancer, asthma, bronchitis, emphysema, lung disease, and heart disease, respiratory allergies are increasing significantly every year. Because of the special properties of electrospun nanofiber mats, e.g., large surface-to-volume ratio and low basis weight, uniform size, and nanoporous structure, nanofiber mats are the preferred choice for use in large-scale air filtration applications. In this review, we summarize the significant studies on electrospun nanofiber mats for filtration applications, present the electrospinning technology, show the structure and mechanism of air filtration. In addition, an overview of current air filtration materials derived from bio- and synthetic polymers and blends is provided. Apart from this, the use of biopolymers in filtration applications is still relatively new and this field is still under-researched. The application areas of air filtration materials are discussed here and future prospects are summarized in conclusion. In order to develop new effective filtration materials, it is necessary to understand the interaction between technology, materials, and filtration mechanisms, and this study was intended to contribute to this effort.
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Affiliation(s)
- Al Mamun
- Junior Research Group “Nanomaterials”, Faculty of Engineering and Mathematics, Bielefeld University of Applied Sciences, 33619 Bielefeld, Germany;
| | - Tomasz Blachowicz
- Institute of Physics-CSE, Silesian University of Technology, 44-100 Gliwice, Poland;
| | - Lilia Sabantina
- Junior Research Group “Nanomaterials”, Faculty of Engineering and Mathematics, Bielefeld University of Applied Sciences, 33619 Bielefeld, Germany;
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12
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Statistical Analysis of Nanofiber Mat AFM Images by Gray-Scale-Resolved Hurst Exponent Distributions. APPLIED SCIENCES-BASEL 2021. [DOI: 10.3390/app11052436] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Two-dimensional structures, either periodic or random, can be classified by diverse mathematical methods. Quantitative descriptions of such surfaces, however, are scarce since bijective definitions must be found to measure unique dependency between described structures and the chosen quantitative parameters. To solve this problem, we use statistical analysis of periodic fibrous structures by Hurst exponent distributions. Although such a Hurst exponent approach was suggested some years ago, the quantitative analysis of atomic force microscopy (AFM) images of nanofiber mats in such a way was described only recently. In this paper, we discuss the influence of typical AFM image post-processing steps on the gray-scale-resolved Hurst exponent distribution. Examples of these steps are polynomial background subtraction, aligning rows, deleting horizontal errors and sharpening. Our results show that while characteristic features of these false-color images may be shifted in terms of gray-channel and Hurst exponent, they can still be used to identify AFM images and, in the next step, to quantitatively describe AFM images of nanofibrous surfaces. Such a gray-channel approach can be regarded as a simple way to include some information about the 3D structure of the image.
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13
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Adhesion of Electrospun Poly(acrylonitrile) Nanofibers on Conductive and Isolating Foil Substrates. COATINGS 2021. [DOI: 10.3390/coatings11020249] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Electrospinning can be used to prepare nanofibers from various polymers and polymer blends. The adhesion of nanofibers to the substrates on which they are electrospun varies greatly with the substrate material and structure. In some cases, good adhesion is desired to produce sandwich structures by electrospinning one material directly onto another. This is the case, e.g., with dye-sensitized solar cells (DSSCs). While both pure foil DSSCs and pure electrospun DSSCs have been examined, a combination of both technologies can be used to combine their advantages, e.g., the lateral strength of foils with the large surface-to-volume ratio of electrospun nanofibers. Here, we investigate the morphology and adhesion of electrospun nanofibers on different foil substrates containing materials commonly used in DSSCs, such as graphite, poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) or TiO2. The results show that the foil material strongly influences the adhesion, while a plasma pretreatment of the foils showed no significant effect. Moreover, it is well known that conductive substrates can alter the morphology of nanofiber mats, both at microscopic and macroscopic levels. However, these effects could not be observed in the current study.
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Cheng C, Dai J, Li Z, Feng W. Preparation and Magnetic Properties of CoFe 2O 4 Oriented Fiber Arrays by Electrospinning. MATERIALS 2020; 13:ma13173860. [PMID: 32882967 PMCID: PMC7504612 DOI: 10.3390/ma13173860] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/09/2020] [Revised: 08/16/2020] [Accepted: 08/21/2020] [Indexed: 11/16/2022]
Abstract
The morphology of magnetic materials has a great influence on the properties, which is attributed to the magnetic anisotropy of the materials. Therefore, it is worth studying the fabrication of the aligned fiber and the change of its domain distribution. Nanoparticles and nanofibers were prepared by the hydrothermal and electrospinning methods, respectively. At the same time, the arranged nanofibers were collected by the drum collecting device. After the same annealing at 700 °C, it was found that the diameter of fibers collected by different collecting drums is similar. By studying the hysteresis loops of nanoarrays, it was found that they had strong anisotropy. The easy axis was parallel to the long axis, the Hc and Mr of the easy axis and the hard axis were 1330.5 Oe, 32.39 Am2/kg, and 857.2 Oe, 24.8 Am2/kg, respectively. Due to the anisotropy of the shape and the interaction between the particles, the Hc could not be enhanced. Therefore, the Ms and Hc of the nanoparticles were 80.23 Am2/kg and 979.3 Oe, respectively. The hysteresis loop and the change of magnetic moment during the demagnetization of the CoFe2O4 nanofiber array were simulated via micromagnetic software. The simulated Hc was 1480 Oe, which was similar to the experimental value.
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Affiliation(s)
- Chen Cheng
- School of Science, Lanzhou University of Technology, Lanzhou 730050, China; (C.C.); (W.F.)
| | - Jianfeng Dai
- School of Science, Lanzhou University of Technology, Lanzhou 730050, China; (C.C.); (W.F.)
- State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China;
- Correspondence:
| | - Zengpeng Li
- State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China;
- Key Laboratory of Solar Power System Engineering, Vocational and Technical College Jiuquan, Jiuquan 735000, China
| | - Wei Feng
- School of Science, Lanzhou University of Technology, Lanzhou 730050, China; (C.C.); (W.F.)
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Fokin N, Grothe T, Mamun A, Trabelsi M, Klöcker M, Sabantina L, Döpke C, Blachowicz T, Hütten A, Ehrmann A. Magnetic Properties of Electrospun Magnetic Nanofiber Mats after Stabilization and Carbonization. MATERIALS (BASEL, SWITZERLAND) 2020; 13:E1552. [PMID: 32230911 PMCID: PMC7177732 DOI: 10.3390/ma13071552] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/05/2020] [Revised: 03/23/2020] [Accepted: 03/24/2020] [Indexed: 11/30/2022]
Abstract
Magnetic nanofibers are of great interest in basic research, as well as for possible applications in spintronics and neuromorphic computing. Here we report on the preparation of magnetic nanofiber mats by electrospinning polyacrylonitrile (PAN)/nanoparticle solutions, creating a network of arbitrarily oriented nanofibers with a high aspect ratio. Since PAN is a typical precursor for carbon, the magnetic nanofiber mats were stabilized and carbonized after electrospinning. The magnetic properties of nanofiber mats containing magnetite or nickel ferrite nanoparticles were found to depend on the nanoparticle diameters and the potential after-treatment, as compared with raw nanofiber mats. Micromagnetic simulations underlined the different properties of both magnetic materials. Atomic force microscopy and scanning electron microscopy images revealed nearly unchanged morphologies after stabilization without mechanical fixation, which is in strong contrast to pure PAN nanofiber mats. While carbonization at 500 °C left the morphology unaltered, as compared with the stabilized samples, stronger connections between adjacent fibers were formed during carbonization at 800 °C, which may be supportive of magnetic data transmission.
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Affiliation(s)
- Nadine Fokin
- Department of Physics, Center for Spinelectronic Materials and Devices, Bielefeld University, 33615 Bielefeld, Germany; (N.F.); (A.H.)
| | - Timo Grothe
- Faculty of Engineering and Mathematics, Bielefeld University of Applied Sciences, 33619 Bielefeld, Germany; (T.G.); (A.M.); (M.T.); (M.K.); (L.S.); (C.D.)
| | - Al Mamun
- Faculty of Engineering and Mathematics, Bielefeld University of Applied Sciences, 33619 Bielefeld, Germany; (T.G.); (A.M.); (M.T.); (M.K.); (L.S.); (C.D.)
| | - Marah Trabelsi
- Faculty of Engineering and Mathematics, Bielefeld University of Applied Sciences, 33619 Bielefeld, Germany; (T.G.); (A.M.); (M.T.); (M.K.); (L.S.); (C.D.)
- Ecole Nationale d’Ingénieurs de Sfax (ENIS), Sfax 3038, Tunisia
| | - Michaela Klöcker
- Faculty of Engineering and Mathematics, Bielefeld University of Applied Sciences, 33619 Bielefeld, Germany; (T.G.); (A.M.); (M.T.); (M.K.); (L.S.); (C.D.)
| | - Lilia Sabantina
- Faculty of Engineering and Mathematics, Bielefeld University of Applied Sciences, 33619 Bielefeld, Germany; (T.G.); (A.M.); (M.T.); (M.K.); (L.S.); (C.D.)
| | - Christoph Döpke
- Faculty of Engineering and Mathematics, Bielefeld University of Applied Sciences, 33619 Bielefeld, Germany; (T.G.); (A.M.); (M.T.); (M.K.); (L.S.); (C.D.)
| | - Tomasz Blachowicz
- Institute of Physics–CSE, Silesian University of Technology, 44-100 Gliwice, Poland;
| | - Andreas Hütten
- Department of Physics, Center for Spinelectronic Materials and Devices, Bielefeld University, 33615 Bielefeld, Germany; (N.F.); (A.H.)
| | - Andrea Ehrmann
- Faculty of Engineering and Mathematics, Bielefeld University of Applied Sciences, 33619 Bielefeld, Germany; (T.G.); (A.M.); (M.T.); (M.K.); (L.S.); (C.D.)
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