Browsing by Author "Musayev, Nijat"

Now showing 1 - 4 of 4

Citation - WoS: 5
Citation - Scopus: 6
Appraisal of Inorganic and Lignocellulosic Organic Shell Wastes as a Green Filler in Epoxy-Based Hybrid Composites
(Elsevier, 2025) Ahmetli, Gulnare; Kocaman, Suheyla; Soydal, Ulku; Kocak, Beril; Ozmeral, Nimet; Musayev, Nijat
Hybrid composites are now becoming increasingly important regarding economic and ecological compatibility. This study presented the research results that evaluate the feasibility of using cherry pit shell (CPSh) and chicken eggshell (ChESh) natural wastes as a new hybrid filler mixture for the first time. CPSh and ChESh can reduce the composite material cost and increase the biobased content. CPSh was treated with a 5 % NaOH alkali solution to enhance the lignocellulosic filler-matrix interfacial interaction. Hybrid green organic and inorganic fillers were used in the epoxy matrix (ER). Morphological, water absorption, thermal, and mechanical performance of hybrid composites were investigated. The tensile strength of ER increased max. by 5.73, 7.3, 17.98, and 14.27 % in the case of raw CPSh, ChESh, and hybrid filler mixtures at 1:1 and 1:3 wt mixing ratios of alkali-treated CPSh (NaOHCPSh) and ChESh, respectively. The composites' thermal stability and dynamic-mechanical properties in different aging environments (seawater and hydrothermal) were examined by thermogravimetric analysis (TGA) and dynamic-mechanical analysis (DMA). Hydrothermal was the most affected aging condition on the composite properties. In addition, ANOVA is applied to find the significant effect of different weight percentages of hybrid fillers on the mechanical properties of composites.
Exploring the Influence of Various Filler Modification Techniques on the Biocomposites Properties Derived From Lignocellulosic Hazelnut Waste Shells
(Elsevier, 2025) Ahmetli, Gulnare; Kocaman, Suheyla; Yuksel, Busra Donmez; Ulusoy, Pinar; Musayev, Nijat
Biocomposites exhibit a wide range of properties and can compete with non-biodegradable polymers across various industrial fields. This study presented research results using hazelnut shell waste (HShW) as a biofiller in an epoxy matrix. HShW was modified using sodium hydroxide and several acids, including ethylenediaminetetraacetic (EDTA), acetic (AA), acrylic (AcA), and linoleic (LA). The modification process increased cellulose content, while lignin and hemicellulose contents decreased. This study explored the effects of filler content and modification type on the composites' mechanical, thermal, dynamic mechanical, water sorption, chemical resistance, and hygrothermal aging properties. The distinct X-ray diffraction (XRD) peaks around 22 degrees confirm that Cellulose I retains its original crystal structure within the composites. All modifications improved the tensile strength of the biocomposites, particularly at 20-30 wt%, ranging from 4.65 % to 53.49 %. The LA-HShW composites displayed the highest tensile strength (101-132 MPa), thermal stability, and glass transition temperature (Tg) values of 101.1 degrees C (DMA) and 66.4 degrees C (DSC). The AcA-and LA-modified HShW composites exhibited the lowest mass loss rate at 379.2 degrees C among the composite materials. All composites demonstrated greater resistance to alkali and acids such as hydrochloric and sulfuric, while showing lower resistance to acetone. In addition, hygrothermal aging increased moisture uptake (2.45-5.68 %) in biocomposites and reduced Tg values. A decrease in the Tg values of DMA and DSC was between 4.80 and 18.71 % and 7.01-18.29 %, respectively. The 20 wt% LA-HShW composite demonstrated significantly greater stability to aging, exhibiting the highest storage modulus (0.85 GPa), loss modulus (0.06 GPa), and DSC Tg (58.2 degrees C) compared to the other composites.
Citation - WoS: 6
Citation - Scopus: 6
Hybrid Epoxy Composites Based on Tire Waste-Derived Carbon Black and Eggshells With Enhanced Properties and Aging Life in Different Environmental Conditions
(Elsevier Science Sa, 2025) Ahmetli, Gulnare; Kocaman, Suheyla; Musayev, Nijat; Gasimov, Javidan; Ozmeral, Nimet
Chicken eggshells (ChESh), are an unusual type of biomaterial and huge biological waste because of their rapid formation. In addition, carbon black (CBpyr) recycled from tire wastes by pyrolysis is a significant raw material for obtaining valuable products. This study investigated the effects of the hybrid fillers (CBpyr and ChESh) on the composite properties. The hybrid filler mixture was created in different weight ratios and incorporated into the epoxy matrix (ER) at 15-35 wt%. The 25 wt% hybrid filler ratio proved to be the most suitable for enhancing the mechanical properties. The tensile strength was 104, 99, and 77 MPa for hybrid composites (HC) in the CBpyr: ChESh hybrid filler at 1:1, 1:3, and 3:1 wt ratios. A 1:1 hybrid filler wt ratio was more effective in enhancing fire resistance properties, while a 1:3 ratio was better for achieving thermal resistance of unaged HCs. All 25 wt% HCs had higher storage and loss modulus values than ER. The maximum weight gains over 30 days in pure water, seawater, and hydrothermal aging conditions were found to be 0.99-1.4 %, 0.86-1.18 %, and 1.64-2.63 % for ER and HCs. In contrast to the unaged composite, the composite with the hybrid filler at a 1:3 wt ratio (HC(1:3)) exhibited higher tensile strength under these aging conditions. The mechanical properties were most affected by hydrothermal aging. Also, a lower glass transition temperature (Tg) value reduction was found for the aged HC (1:3). This composite is the most resistant to UV rays.
Citation - WoS: 4
Citation - Scopus: 4
Multi-Walled Carbon Nanotubes and Graphene Oxide-Based Epoxy Hybrid Nanocomposites: Investigation of Nanofiller Modification Effect
(Elsevier, 2025) Ahmetli, Gulnare; Kocaman, Suheyla; Musayev, Nijat; Ozmeral, Nimet; Isik, Murat
Multi-walled carbon nanotubes (MWCNTs) are important nanomaterials utilized in various research and technological applications. Graphene oxide (GO) is another fascinating material that can be effectively applied in various fields, including nanocomposite materials, energy storage, biomedical applications, and catalysis. This study first examined the effect of hybridizing a 1:1 wt ratio mixture of modified carboxyl-functionalized MWCNTs (MWCNTCOOH) and graphene oxide (GO) nanofillers on the properties of novel epoxy resin (ER)based composites. GO was synthesized from graphite. The surface modification of both nanoparticles was performed using polyaniline (PANI) and/or ionic liquid 1-butyl-3-methylimidazolium bromide (IL). The hybrid reinforcement ratio in ER ranged from 0.5 % to 2 % by weight. At the reinforcement ratio of 1.5 wt%, the increase in tensile strength of all nanocomposites compared to ER varied between 22.2 % and 62.8 %. Modification with PANI showed improved mechanical, thermal, and electrical conductivity, as well as enhanced durability in hot water compared to IL. Additionally, PANI and IL further increased the chemical resistance of the hybrid nanocomposites. The highest and lowest glass transition temperatures (Tg) correspond to the 1.5 wt% PANIMWCNTCOOH/ GO (108.60 degrees C) and the IL-MWCNTCOOH/ GO (97.99 degrees C) hybrid nanocomposites, respectively. The electrical conductivity ranges in value from 6.9 x 10-8 to 1.22 x 10-4 S/cm, depending on the hybrid nanocomposite type. The nanocomposites demonstrated superior UV resistance compared to ER, showing an absorbance range of 0.305 to 1.391 a.u. Furthermore, the ANOVA test demonstrated the impact of the hybrid filler type and ratio on the nanocomposite's mechanical properties.