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Öğe Carbon Nanotubes and Similar Nanostructures Derived from Biomass for Supercapacitors Application(Springer Science and Business Media Deutschland GmbH, 2023) Duygun, İnal Kaan; Çelik Bedeloğlu, AyşeCarbon nanotubes are advanced carbon materials with unique physicochemical and mechanical properties that make them important candidates for supercapacitor applications. However, their synthesis mostly requires carbon precursors derived from fossil fuel-related compounds. Recently, the use of biomass as a carbon source for energy storage materials has attracted great attention. Biomass precursors are considered an alternative carbon source to fossil fuel-related compounds in energy storage devices. In this section, the importance of biomass-based carbon nanotubes, their composites, and similar nanostructures for supercapacitor applications is evaluated. The potential use and common applications of biomass-based carbon nanotubes for high-performance SC applications are assessed. The synthesis methods for carbon nanotubes from biomass precursors are presented. A future perspective of biomass-derived carbon nanotubes and the fabrication of high-performance supercapacitors are also discussed. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.Öğe Conducting polymer blends, interpenetrating polymeric networks, and gels based on polyvinyl chloride(Elsevier, 2024) Duygun, İnal Kaan; Altin, Yasin; Çelik Bedeloğlu, AyşeConducting polymers (CPs) are polymers that attract great attention due to their very good electrical and optical properties. However, their mechanical strength and processability are far from the necessary conditions for many applications. On the other hand, polyvinyl chloride (PVC), which is the third most produced polymer in terms of quantity, is a common polymer type whose properties can be changed with many additives and thus can be used in many different fields. The resulting blended films find application in areas such as sensors, supercapacitors, electromagnetic shielding, and antistatic coating. In this section, first of all, the electrical, optical, and mechanical properties of CP/PVC mixtures will be examined. Then, the applications of CP/PVC mixtures will be mentioned. © 2024 Elsevier Inc. All rights reserved.Öğe Electromagnetic interference shielding applications of poly-ether-ether-ketone (PEEK)-based hybrids and composites(Elsevier, 2025) Sezer Hicyilmaz, Ayse; Çelik Bedeloğlu, AyşeWith the advancement of technology, electromagnetic interference (EMI) and electromagnetic radiation pollution have become a serious global problem. Polymeric composites have been widely used as an alternative to metals for electromagnetic shielding, which is the most efficient material. Polyether ether ketone (PEEK) is a high-performance engineering polymer with outstanding mechanical, chemical, and thermal properties. It is frequently employed in industries that require EMI protection, such as aircraft, space exploration, and military. In recent years, a large number of studies on PEEK polymers with EMI shielding properties have been performed. These studies mainly focused on the preparation of the composites added with carbon-based or metal-based nanoparticles, carbon fibers, metal-coated carbon fibers, and hybrid additives in the PEEK polymer matrix or PEEK blends. This chapter reviews the representative additives in PEEK composites or blends, the preparation methods, and the EMI shielding properties. Moreover, the relationship between EMI shielding properties and other material properties is also discussed. The application of these composites in different industries and the expecting prospects in this emerging field are introduced. © 2026 Elsevier Inc. All rights reserved.Öğe MXene/cellulose nanocrystal-coated cotton fabric electrodes for wearable electronics(Springer Science and Business Media Deutschland GmbH, 2024) Duygun, İnal Kaan; Çelik Bedeloğlu, AyşeIncreasing mechanical properties without losing electrical properties is of great importance for the development of advanced electronic textile products and their use in different areas. In this study, a cost-effective and facile preparation of MXene/cellulose nanocrystal-coated cotton fabrics by drop-casting was carried out to investigate electrical and mechanical properties of plain woven cotton fabrics. MXene (Ti3C2Tx) and cellulose nanocrystal dispersions of MXene (5 wt.%, 10 wt.% and 15 wt.% cellulose nanocrystal content) were applied to cotton fabrics, and the coated fabrics were characterized in terms of their morphological and structural properties for their suitability for wearable electronics. The surface resistivity and mechanical properties were also determined to evaluate the effectiveness of coating. Ti3C2Tx/cellulose nanocrystal dispersions are suitable to obtain a low electrical resistivity (186.4 ?/sq) in cotton fabrics. The results also showed that increasing cellulose nanocrystal content results in a more stable coating layer on the cotton fabric and a high tensile (63.2 MPa) and elongation at break values are obtained (30.2%) as a result of that. © King Abdulaziz City for Science and Technology 2024.Öğe Self-standing piezoelectric nanogenerator fabrics from ZnO-doped PVDF nanofiber yarns(John Wiley and Sons Inc, 2024) Borazan, Ismail; Çelik Bedeloğlu, AyşeToday a wide variety of wearable electronics are in our daily lives and their uses are increasing. The development of portable, flexible, lightweight, cost-effective, and stable devices that produce sustainable energy with renewable approaches in the field of wearable electronics, as in every field, is one of the important issues of today. According to their volume and weight, the use of nanofibers with high surface area in energy-generating devices may bring them advantages such as lightness and higher energy density. Therefore, in recent years, researchers have focused on the development of nanofiber-based nanogenerators that produce energy using mechanical energy in a sustainable and renewable way. In this paper, self-standing piezoelectric nanogenerator (PENG) fabrics were obtained by developing flexible composite poly(vinylidene fluoride) (PVDF) nanofiber yarns doped with zinc oxide (ZnO) nanoparticles at different rates to provide higher power output. It has been characterized from electromechanical, structural, and morphological aspects. The most successful self-standing PENG fabric obtained (at 5% ZnO loading) doubled the energy output of the fabric made from pure PVDF nanofiber yarn and provided a peak total power of 81 ?W and a power density of 30 ?W/cm2. The present results open up the field for the development of PVDF/ZnO-based nanomats and their use in sensors and actuators in the healthcare and engineering industries. © 2023 The Authors. Journal of Applied Polymer Science published by Wiley Periodicals LLC.Öğe Textile-Based Flexible Supercapacitors(CRC Press, 2022) Altin, Yasin; Çelik Bedeloğlu, AyşeWith the increase in smart and wearable electronic applications, it has become important to meet the energy demands of these products with flexible and wearable energy storage technologies. Conventional energy storage techniques have difficulty meeting critical requirements, such as flexibility and safety, for wearable electronics applications. Among the textile-based energy storage applications, flexible textile-based supercapacitors stand out due to their advantages, which include flexibility, light in weight, environmentally friendly, long cycle life, and fast charge/discharge. Carbon-based materials (activated carbon, graphene, carbon nanotube, carbon nanofiber, etc.), metal oxides/nitrides/sulfides, conductive polymers (polyaniline, polythiophene, polypyrrole, PEDOT: PSS, etc.), and their combinations are used as electrode materials in supercapacitor applications. Textile-based supercapacitors are developed both by spinning/drawing these electrode materials into a textile form, such as graphene yarn, carbon nanotube yarn, etc., and by applying them on various textile substrates. In this chapter, materials used in textile-based supercapacitors, application techniques of these materials, and textile-based supercapacitor forms are discussed in detail. © 2022 selection and editorial matter,[Ram K. Gupta, Tuan Anh Nguyen; individual chapters, the contributors.
