Person: AYKUT, YAKUP
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AYKUT
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YAKUP
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Publication Regenerated cellulose woven fabric reinforced hydrogel composite(Taylor, 2021-03-29) Koç, Ümit; Aykut, Yakup; Eren, Recep; Koç, Ümit; AYKUT, YAKUP; EREN, RECEP; Mühendislik Fakültesi; Tekstil Mühendisliği Bölümü; 0000-0002-9061-3040; JTV-2018-2023; G-2674-2016; CPO-1051-2022This study evaluates the effects of different aqueous borax solutions on the morphology, mechanical, thermal and chemical properties of regenerated cellulose fiber woven fabric reinforced hydrogel composites. The fabric reinforced hydrogel composites were fabricated with PVA/viscose ring, PVA/viscose open-end (viscose OE), PVA/viscose continuous filament (viscose CF) blended woven fabrics. Mechanical tests results showed that regenerated cellulose fiber woven fabric reinforced hydrogel composites made from PVA/viscose CF (380 N) exhibited better mechanical performance than its viscose ring (258 N) and viscose OE (318 N) counterparts. Another significant result, evaluated using statistical package for social sciences (SPSS) data analysis showed that there was a high level positive and meaningful relationship between borax-water concentration and breaking force at the breaking points of regenerated cellulose woven fabric reinforced hydrogel composites in the warp direction. The results have suggested that the regenerated cellulose fabric reinforced hydrogel composites with enhanced mechanical properties could be used as agricultural water retention materials and in geotextiles applications.Publication Cellulose monoacetate/nafion (cma/n) hybrid nanofibers as interface for electrochemical dna biosensors(Ege Univ, 2019-07-01) Bostancı, Ayşe; AKÇALI BOSTANCI, NİHAL; Tanık, Nilay Aladağ; Aykut, Yakup; AYKUT, YAKUP; Mühendislik Fakültesi; Tekstil Mühendisliği Bölümü; JTV-2018-2023Cellulose monoacetate/Nafion (CMA/N) hybrid nanofibers were produced via a one-step electrospinning method. Nanofibers morphologies transformed from uniform to bead on a string defect morphology with increasing Nafion ratio in CMA/N hybrid nanofibers. The melting point of CMA was detectable at DSC measurement, but since the addition of Nafion did not allow a proper crystallization of CMA, melting peak disappeared after the Nafion addition. Decomposition temperature decreased dramatically with the addition of Nafion into CMA/N nanofibers and decomposition took place at a broad temperature range. Nanofibers were also electrospun on the cylindrical graphite electrode for DNA electrochemical sensor analysis. Unmodified and NH-modified single strand DNA molecules were immobilized via physical adsorption method on the asprepared nanofiber sensory system. Electrochemical analysis were performed via differential pulse voltammetry (DPV) to observe the guanine oxidation signal at unmodified and NH-modified DNA. Maximum oxidation signals were detected from pure CMA nanofibers at unmodified DNA. Signal intensity increased with the addition of Nafion into CMA/N nanofibers at NH-modified DNA sample comparing to unmodified DNA. It was concluded that DNA molecules could be properly immobilized on the produced CMA/N hybrid nanofibers via physical adsorption method and used as electrochemical DNA biosensor.Publication Ecofriendly development of electrospun antibacterial membranes loaded with silver nanoparticles(Sage Publications, 2021-04-22) İrfan, Muhammad; Uddin, Zia; Ahmad, Faheem; Rasheed, Abher; Qadir, Muhammad Bilal; Ahmad, Sheraz; Aykut, Yakup; Nazir, Ahsan; AYKUT, YAKUP; Mühendislik Fakültesi; Tekstil Mühendisliği Bölümü; JTV-2018-2023Functional polymeric membranes with antibacterial properties have gained significant importance in many applications. Silver NPs offer advantage over other materials for their effective antibacterial properties and being safer for humans at low concentrations. The synthesis of silver NPs may not always be environmental friendly and their incorporation in the polymer membranes is usually a multistep process. In this study, PVDF/PVP/AgNPs electrospun membranes were developed in a single step process where silver NPs were synthesized using reducing and stabilizing properties of PVP. The UV-vis spectroscopy confirmed the synthesis of silver NPs in PVP solution by sharp absorption peak at 398 nm. The membranes were loaded with various concentrations of silver NPs (1, 1.5, 2 and 2.5 wt%). The scanning electron microscopy of the developed membranes showed nano fibers of uniform diameter at optimized electrospinning conditions. FTIR spectroscopy also confirmed the successful development of polymeric composite (PVDF/PVP/AgNPs) membranes. The composite membranes demonstrated effective antibacterial properties against Staphylococcus aureus in disk diffusion test. The size of the inhibition halo increased with the concentration of the silver NPs in electrospun membranes. The findings of this study will be helpful in the simple and environmentally friendly development of antibacterial membranes for applications such as air and water filtration.Publication Cellulose monoacetate/tetraethyl orthosilicate hybrid nanofibers for electrochemical DNA biosensors(Korean Fiber, 2021-03-03) Civan, Sinem; Aydın, Şeval; Tanık, Nilay Aladağ; Aykut, Yakup; Civan, Sinem; Aydın, Şeval; Tanık, Nilay Aladağ; AYKUT, YAKUP; Mühendislik Fakültesi; Tekstil Mühendisliği Bölümü; JTV-2018-2023; EQW-9988-2022; CEH-2842-2022; EAB-4433-2022Cellulose monoacetate/tetraethyl orthosilicate (CMA/TEOS) hybrid nanofibers were produced with different ratios via electrospinning and used for guanine oxidation analysis in the single strand deoxyribonucleic acid (ssDNA) molecules by electrochemical method. Nanofiber (NF) diameters for pure CMA dramatically decreased from between 2.4 mu, -306 nm to between 958-42 nm with addition of hydrochloric acid (HCl) catalyzer into the electrospinning solution. Uniform CMA nanofibers morphologies transform to more defect structures containing particular structures with the addition and increase of TEOS content in CMA electrospinning solution. Also, nanofibers' diameters range became more fluctuated form and ultrafine nanofibers (diameters below 100 nm) existed more in the nanofiber mat. Even though the melting point was seen at CMA nanofibers, melting points were not detectable in CMA/TEOS NFs since TEOS addition does not allow an appropriate crystallization. Thermal analysis results revealed that residual contents after TGA measurement in nitrogen atmosphere were gradually increased by increasing TEOS ratio in CMA/TEOS nanofibers. ssDNA molecules were immobilized on the as-spun nanofibers and differential pulse voltammetry (DPV) measurements were carried out to investigate the guanine oxidation in ssDNA. Guanine oxidation signal intensities decreased with the initial addition of TEOS to CMA nanofibers and increases again by increasing TEOS content in CMA/TEOS hybrid nanofibers and then gradually decreases again with increasing TEOS content. The prepared CMA/TEOS hybrid nanofibers could be a promising candidate as an electrode interface for genetic molecule detection via electrochemical methods.Publication Investigation of mechanical properties of a novel green composite developed by using enset woven fabric and bioresin materials(Springer, 2023-07-12) Temesgen, Alhayat Getu; Eren, Recep; EREN, RECEP; Aykut, Yakup; AYKUT, YAKUP; Mühendislik Fakültesi; JTV-2018-2023The developments of environmental concerns and regulations have pushed most of the composite industries to revisit natural resources. They have focused on natural fibers as a reinforcing material having low cost, low density and good mechanical strengths. Enset woven fabric is manufactured from enset fibers, which are abundantly available, light weight (1.2 g/cm(3)), moderate moisture content (10%) and biodegradable un-utilized new fiber under Ensete Ventricosum family. This research work focused on investigating mechanical properties of a new green composite fabricated by enset woven fabric reinforcement and specially prepared bioresin from plant gums. The tensile strength of the enset fabric was improved four times from 528 to 2074 N in single-layer composite structure, while double-layer composite tensile strength was obtained as 3480 N. The test results indicated that the laboratory-made bioresin matrix from acacia and frankincense gums had a significant effect on the mechanical strength of composite structures compared with enset fabrics having the same number of threads (warps) in the specimens. Increasing the grammage of bioresin restored energy and improved the performance of tensile and flexural strength by reducing the deformation of composite structures. Generally, this study revealed that enset woven fabric as reinforcing structure and mixed acacia-frankincense bioresin as a matrix materials had a promising result to be used as composite materials in light weight structural applications with the same potential to improve its performance.Publication One-step preparation of woven fabric-reinforced hydrogel composite(Sage Publications, 2021-02) Koç, Ümit; Aykut, Yakup; Eren, Recep; AYKUT, YAKUP; EREN, RECEP; Koç, Ümit; Mühendislik Fakültesi; 0000-0002-9061-3040; G-2674-2016; JTV-2018-2023; CPO-1051-2022Cotton-woven fabric-reinforced polyvinyl alcohol-based hydrogel composite was produced by constructing cotton as warp and polyvinyl alcohol/cotton hybrid and polyvinyl alcohol yarns as weft yarns in the fabric structure. As-prepared polyvinyl alcohol/cotton fabrics were treated with different concentrations of aqueous borax and glutaraldehyde crosslinking solutions. Polyvinyl alcohol molecules were transformed to crosslinked gel structure after the treatments. Since cotton yarns kept their yarn structure in the fabrics, woven fabric-reinforced hydrogel composites were obtained. Chemical analysis to investigate crosslinking was conducted by attenuated total reflection-Fourier transform infrared spectroscopy spectra analysis, and the results revealed that a proper crosslinking of polyvinyl alcohol molecules in polyvinyl alcohol yarns occurred by using both borax and glutaraldehyde as crosslinkers. Thermal stabilities of the samples were observed via thermogravimetric analysis measurements. Even though borax crosslinking increased the thermal stability, glutaraldehyde crosslinking did not have a significant effect on the thermal stability of hydrogel composite. Crystalline microstructural analysis was carried out with X-ray diffraction measurement. Tensile properties of the samples by focusing on the crosslinker ratio and water contents in the hydrogel composites were performed. The results revealed that tensile properties of hydrogel composite tremendously increased with fabric reinforcement. Also, breaking force gradually increased when the hydrogel composite structure released the water from its structure at both borax and glutaraldehyde samples. Since the produced fabric-reinforced hydrogel composites have high strength, they are promising candidates as hygroscopic materials for planting and erosion control at inclined terrains.Publication Guanine oxidation signal amplification in single strand DNA molecules with heat-treated polyacrylonitrile/sulfuric acid micro/nanofibrous system(Wiley, 2020-10-03) Aydın, Şeval; Tanık, Nilay A.; Aykut, Yakup; Aydın, Şeval; Tanık, Nilay A; AYKUT, YAKUP; Mühendislik Fakültesi; Fen Bilimleri Enstitüsü; Tekstil Mühendisliği Bölümü; JTV-2018-2023; CEH-2842-2022; EAB-4433-2022Effect of sulfuric acid (SA) on the heat treatment of electrospun polyacrylonitrile (PAN) fibers and their application on guanine oxidation detection in single-strand DNA molecules (ssDNA) were studied. In this regard, two different approaches were performed. Aqueous sulfuric acid solutions were poured on the pure PAN nanofibers and heat treatment process was performed to determine the maximum temperature at which fiber structures does not deteriorate. Also, SA was directly added into electrospinning solutions with different ratios and heat treatment process was applied to the as-spun PAN/SA fibers. The fibers were produced both directly on a grounded plate and cylindrical pencil graphite surfaces (PGE) for the fiber characterizations and biosensor measurements. Single strand DNA (ssDNA) molecules were immobilized on the samples for the electrochemical investigation of guanine oxidation signal. 0.971 and 3.69 mu A guanine oxidation signal intensities were detected for neat PGE and heat-treated PAN/SA fiber coated PGE. The formation of sulfonic groups on the fibers has driven more ssDNA attachment on the surface, and hence increased the guanine oxidation signal intensity dramatically (about 261.4% increment). The results have shown promising future of heat-treated PAN/SA micro/nanofibers for sensitive detection of guanine oxidation signal from genetic molecules.Publication Yarn-reinforced hydrogel composite produced from woven fabrics by simultaneous dissolution and cross-linking(Sage, 2021-02-01) Koç, Ümit; Eren, Recep; Aykut, Yakup; Koç, Ümit; EREN, RECEP; AYKUT, YAKUP; Fen Bilimleri Yüksekokulu; Tekstil Mühendisliği; 0000-0002-9061-3040; JTV-2018-2023; G-2674-2016; CPO-1051-2022Polyvinyl alcohol (PVA)/cotton (Co) woven fabrics were produced by constructing Co as warp yarns and PVA as weft yarns in the fabric structure. As-prepared PVA/Co fabrics were treated with borax/water solution. Because of the simultaneous dissolution and gelation of PVA yarn in the fabric and transformation of PVA molecules into cross-linked gel structures, gel penetrated among the yarns in the matrix form and hence Co yarn-reinforced composite hydrogels were obtained. The retention time of water by composite hydrogels was first increased and then decreased by increasing borax concentration in the cross-linker solution. With yarn reinforcing, the tensile strength of hydrogel structure significantly increased. Mechanical properties of hydrogel composites were very variable depending on water content in the structure and tensile strength tremendously increased when water evaporated from the structure. Thermal and chemical characterizations of yarn-reinforced hydrogel composites were conducted in addition to swelling and mechanical analysis to investigate the performance of the hydrogel composites.Publication Hemoglobin assisted carbon nanofiber preparation for selective detection of miRNA molecules(Sage Publications, 2021-10-24) Sahtani, Karima; Aykut, Yakup; Tanık, Nilay Aladağ; Sahtani, Karima; AYKUT, YAKUP; Tanık, Nilay Aladağ; Mühendislik Fakültesi; Tekstil Mühendisliği Bölümü; 0000-0002-4424-8855; JTV-2018-2023; DPL-7304-2022; EAB-4433-2022A selective miRNA detection is an important factor for the early-stage diagnosis of the diseases and determination of an appropriate treatment method. In this regard, hemoglobin assisted carbon nanofibers (CNFs) were prepared via electrospinning of the precursor polyacrylonitrile/hemoglobin (PAN/Hb) hybrid nanofibers and the following heat treatment process. Addition of low ratio Hb in the precursor PAN nanofibers caused a catalytic effect on the reaction taken place during the stabilization process that helps the formation of more graphitic structure during the carbonization process. But, increasing Hb ratio in the PAN/Hb nanofibers caused an inhibiting effect on the related reactions. Guanine oxidation signals of miRNA molecules were determined via differential pulse voltammetry (DPV) measurement. In this regard, the attachment of anti-miRNA molecules on the CNFs immobilized screen-printed electrodes (SPEs) and a following hybridization of the attached anti-miRNA with miRNA molecules were carried out. Three different miRNA molecules including the target (miRNA), single-base mismatched (SM.miRNA), and non-complementary (NC.miRNA) were hybridized with the previously attached anti-miRNA molecules on the Hb-CNFs immobilized SPEs. The enhancement of the guanine oxidation signal level was observed by using Hb-CNFs instead of using CNFs. That could be attributed to the increase of the graphitic level with low Hb addition to the precursor PAN/Hb nanofibers that causes a catalytic effect on carbonization process. The prepared biosensory system could be used for the selective detection of miRNA molecules.Publication Evaluation of enset fabric reinforced green composite as sound absorber structure(Ege Universitesi, 2021-04-01) Temesgen, Alhayat Getu; Eren, Recep; Aykut, Yakup; Süvari, Fatih; Temesgen, Alhayat Getu; EREN, RECEP; AYKUT, YAKUP; SÜVARİ, FATİH; Bursa Uludağ Üniversitesi, Mühendislik Fakültesi, Tekstil Mühendisliği Bölümü; Tekstil Mühendisliği Bölümü; 0000-0001-5708-7993; 0000-0002-5263-1985; 0000-0001-9389-0281; 0000-0001-7841-2281; JDH-9222-2023; CPO-1051-2022; JTV-2018-2023; N-1770-2019Noise is a problem that should be reduced in a variety of places. Fibrous structures are some of the most commonly used materials for sound absorption applications. Enset fibers have a limited use in technical textile applications especially in packaging sector and are mostly left as an agro waste materials. The aim of this research work was to investigate the acoustic property of this new alternative natural fiber (fabric) and its green composite material. The sound absorption performance of enset fabric and its green composite was determined with impedance tube method. The porosity and void structure of enset fibers were studied by scanning electron microscope (SEM) for analysis of enset fabric and enset fabric reinforced composite sound dissipation mechanism. The sound absorption coefficient of enset fabric could only reach to 0.5 level with 5 layers of enset fabric after 3500 Hz frequency. Composite structures with increasing number of fabric layers decreased sound absorption frequency interval. With 5 layers composite (5 fabric layers in the composite), a sound absorption coefficient remained over 0.5 at a large frequency interval between 2830 and 6000 Hz while it was reaching to 0.9 at around 2500 Hz frequency. Increasing the ratio of bio resin to enset fabric caused the sound absorption behavior of composite material tend to shift from higher to medium frequency regions.