Yazar "Ozlusoylu, Ismail" seçeneğine göre listele
Listeleniyor 1 - 8 / 8
Sayfa Başına Sonuç
Sıralama seçenekleri
Öğe Analysis and Impact of Activated Carbon Incorporation into Urea-Formaldehyde Adhesive on the Properties of Particleboard(Mdpi, 2023) Ergun, Mehmet Emin; Ozlusoylu, Ismail; Istek, Abdullah; Can, AhmetNowadays, the particleboard industry cannot meet the market's demand. Therefore, filler materials have started to be used both to conserve raw materials and to enable the use of wood-based boards in different areas. This study investigates the effects of incorporating different ratios of activated carbon (0%, 1.5%, 4.5%, 7.5%) on the properties of particleboards. The physical properties were examined, including density, moisture content, thickness swelling, and water absorption. The results reveal that the density increased with increasing activated carbon content while the moisture content decreased, indicating improved dimensional stability and water resistance. Additionally, the color properties were influenced by activated carbon, leading to a darker appearance with decreased lightness and yellow-blue components. The mechanical properties, such as internal bond strength, modulus of rupture, and modulus of elasticity, showed significant enhancements with the addition of activated carbon, indicating improved bonding and increased strength. Moreover, the thermal conductivity decreased with increasing activated carbon content and improved insulation performance. Scanning electron microscope analysis confirmed the uniform distribution of activated carbon within the particleboard matrix, without agglomeration, positively impacting the mechanical performance. According to the thermogravimetric analysis results, the addition of activated carbon led to a decrease of up to 6.15% in mass loss compared to the control group. The incorporation of activated carbon at a ratio of 4.5% in particleboards confers notable enhancement to their physical, mechanical, and thermal characteristics. These findings contribute to understanding the potential benefits and considerations of using activated carbon as an additive in particleboard production.Öğe Optimized Eco-Friendly Foam Materials: A Study on the Effects of Sodium Alginate, Cellulose, and Activated Carbon(Mdpi, 2024) Ergun, Mehmet Emin; Kurt, Rifat; Can, Ahmet; Ozlusoylu, Ismail; Kalyoncu, Evren ErsoyThis study focuses on optimizing the physical and mechanical properties of foam materials produced with the addition of sodium alginate as the matrix, and cellulose and activated carbon as fillers. Foam materials, valued for their lightweight and insulation properties, are typically produced from synthetic polymers that pose environmental risks. To mitigate these concerns, this study investigates the potential of natural, biodegradable polymers. Various foam formulations were tested to evaluate their density, compression modulus, and thermal conductivity. The results indicated that an increase in activated carbon content enhanced thermal stability, as indicated by higher Ti% and Tmax% values. Additionally, a higher concentration of sodium alginate and activated carbon resulted in higher foam density and compressive modulus, while cellulose exhibited a more intricate role in the material's behavior. In the optimal formula, where the sum of the component percentages totals 7.6%, the percentages (e.g., 0.5% sodium alginate, 5% cellulose, and 2.1% activated carbon) are calculated based on the weight/volume (w/v) ratio of each component in the water used to prepare the foam mixture. These results indicate that natural and biodegradable polymers can be used to develop high-performance, eco-friendly foam materials.Öğe Properties of Oak Wood Incorporating Microencapsulated Phase Change Material(North Carolina State Univ Dept Wood & Paper Sci, 2023) Can, Ahmet; Ergun, Mehmet Emin; Ozlusoylu, IsmailMicroencapsulated phase change materials (MPCMs) incorporated into oak wood via vacuum impregnation have shown promise as thermal energy storage (TES) materials. Physical and chemical properties of MPCMs and resulting Phase Change Energy Storage Wood (PCESW) were analyzed. Scanning electron microscopy and particle size analyses revealed similar particle sizes, while X-ray diffraction (XRD) and Fourier transform infrared spectra confirmed crystal phase and chemical structure. Thermal gravimetric analysis (TGA) and differential scanning calorimetry determined thermal properties, including phase change temperature, enthalpy, thermal stability, and conductivity. The MPCMs exhibited a phase change enthalpy of 146.0 J/g and temperature of 35.0 & DEG;C, with excellent thermal stability. The FTIR, XRD, and TGA analyses showed unchanged chemical structure, crystallinity ratios, and decomposition in two stages, respectively. The PCESW exhibited a latent heat storage of 3.02 J/g at 25.4 & DEG;C. Decay tests demonstrated noticeably reduced weight loss (1.22% and 1.55%) for MPCMW samples treated with Trametes versicolor and Coniophora puteana, compared to unleached control samples (19.7% and 20.8%). These findings indicate the high efficiency and potential of PCESW as a thermal energy storage material.Öğe Properties of Pinus nigra Arn. wood impregnated with phase change materials for potential energy-saving building material(Elsevier, 2024) Can, Ahmet; Ozlusoylu, Ismail; Sozen, Eser; Ergun, Mehmet EminIn this research, Pinus nigra solid wood (SW) and myristic acid (MA) were prepared as a shape stable phase change material (PCM) using a vacuum impregnation method. Three different concentrations of wood samples such as 15 %, 30 % and 60 % were impregnated and a minimum of 8 % and maximum of 22 % weight gain was obtained. The impregnated samples were characterised by scanning electron microscope (SEM), fourier transform infrared spectrometer (FTIR), X-ray diffractometer (XRD) and differential scanning calorimeter (DSC) analyses and water uptake, resistance to fungal decay, modulus of rupture, modulus of elasticity, compressive and tension strength parallel to the fibers of the samples were tested. The maximum weight increase after impregnation was 25 % and 60 % for the water uptake test samples. The most satisfactory sample was the 60 % modified wood which solidified at 53.50 C with a latent heat of 26.1 J/g and melted at 51.01 C-degrees with a latent heat of 24.7 J/g (medium -temperature zone (buildings fields)). After impregnation, FTIR and XRD analyses revealed no chemical interaction between MA and the wood. Wood was decomposed in a single stage at 367 C, and MAmodified wood was decomposed at two different temperatures: 181-198 C and 365-372 C. At 60 % concentration, MA -modified wood samples showed resistance to T. versicolor fungus, and weight loss of less than 5 % was obtained. After 264 h in the water, the hygroscopic tests demonstrated that the MA/SW composite exhibited low water uptake and good anti -swelling efficiency (ASE). Wood samples impregnated with 60 % MA rose in modulus of rupture and modulus of elasticity, whereas compression and tension parallel to grain values decreased by 7 % and 5 %, respectively. The improvements in heat conductivity are almost 64 % more than the control wood (0.15 W/mK).Öğe Reducing formaldehyde emissions and enhancing performance of particleboards through the incorporation of activated carbon produced from Scots pine wood residues(Wiley, 2025) Ergun, Mehmet Emin; Koyuncu, Filiz; Istek, Abdullah; Ozlusoylu, IsmailWood-based composite boards present a problem due to formaldehyde emissions from engineered particleboard, which pose health and environmental risks. This study explored the production of activated carbon (AC) from Scots pine (Pinus sylvestris) wood residues using phosphoric acid (H3PO4) as a chemical activator. The process of using waste biomass as raw material for AC production improves waste management and contributes to the circular economy by creating a high-value product from forestry industry byproducts. Activated carbon with a Brunauer-Emmett-Teller (BET) surface area of 1066.46 m2g-1 and a porous structure that enhances adsorption capacity was incorporated into urea-formaldehyde (UF) resin at varying levels (0.0%, 0.5%, 1.0%, and 1.5% by dry weight of the adhesive) for particleboard production. These boards were evaluated for their formaldehyde emissions, physical properties, and mechanical properties. Results showed that adding AC reduced formaldehyde emissions significantly, by up to 50%. The particleboards prepared using the modified resin also demonstrated improved physical and mechanical properties, with a 10% increase in density contributing to enhanced strength and durability. Overall, this approach shows the potential to reduce formaldehyde emissions and improve the sustainability of particleboard production, improving both environmental and human health outcomes.Öğe The Effect of Foamed Urea-Formaldehyde Adhesive on Physical and Mechanical Properties of Medium Density Fiberboards (MDF)(Zagreb Univ, Fac Forestry, 2024) Ozlusoylu, Ismail; Stek, Abdullah, I; Ergun, Mehmet Emin; Aydemir, Denizcenter dot In this study, the effect of using foamed urea-formaldehyde (UF) adhesive in the production of medium-density fiberboard (MDF) on the properties of the board was investigated. A commercial foaming agent was used to increase the volume of UF adhesive by approximately 2.5 times. MDFs were produced using 6, 9 and 12 % adhesive and1 % ammonium chloride hardener relative to the dry weight of the adhesive. The thermal degradation behavior of the foamed and control adhesives was determined by thermal analysis i.e., thermogravimetric (TGA) and derivative thermogravimetric (DTG) analyses. It was found that the foaming agent did not affect the thermal degradation of the adhesive. Scanning electron microscope images showed that the volume of foamed adhesive and blending efficiency increased. It was determined that MDFs produced with foamed adhesive had better water absorption and thickness swelling properties than control boards. However, the internal bond strength (IB) and modulus of elasticity (MOE) were found to be 8-14 % and 3-16 % higher, respectively, compared to the control samples. As a result, it can be concluded that the foaming process had a positive effect on the board properties and had the potential to reduce the amount of adhesive used.Öğe Utilization of orange peel waste for activated carbon production and its application in particleboard for formaldehyde emission reduction(Wiley, 2025) Ergun, Mehmet Emin; Koyuncu, Filiz; Istek, Abdullah; Ozlusoylu, Ismail; Bulbul, Saban; Kilic-Pekgozlu, AybenActivated carbon (AC) is valued for its large surface area, porosity, and chemical adsorption properties, making it suitable for a wide range of industrial applications. Its most common sources are coconut shells, wood, and coal - all of which are costly or harmful to the environment. It is thus important to finding sustainable feedstock, such as agricultural waste. Inexpensive materials like waste orange peel have been used in the production of AC. This study explores the synthesis of AC from orange peel waste through phosphoric acid (H3PO4) activation for potential applications in reducing volatile organic compounds such as formaldehyde emissions in particleboard production. Scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), nitrogen adsorption/desorption isotherms, and Fourier transform infrared (FTIR) spectroscopy were used to examine AC. The Brunauer-Emmett-Teller (BET) surface area of AC was 497 m2g(-)(1). The addition of AC to urea-formaldehyde (UF) adhesive enhanced cross-linking and condensation reactions, improving the mechanical and physical properties of particleboards without compromising integrity. The effects of AC on formaldehyde emissions were assessed at 0 and 3 months. Compared to the control group, particleboards with AC showed a 28.98% reduction in free formaldehyde emissions at 0 months and a 45.25% reduction at 3 months. Activated carbon derived from orange peels can thus improve particleboard properties while reducing formaldehyde emissions in an environmentally sustainable way.Öğe Valorization of orange peel waste: activated carbon production and its role in enhancing particleboard performance(Springer, 2025) Ergun, Mehmet Emin; Koyuncu, Filiz; Istek, Abdullah; Ozlusoylu, IsmailThe valorization of agricultural waste has gained increasing attention in recent years, with orange peel waste emerging as a promising precursor for activated carbon (AC) production. This study investigates the production of AC from orange peel waste using zinc chloride (ZnCl2) as a chemical activator and evaluates its impact on the physical, mechanical, and environmental properties of three-layer particleboards. AC was incorporated into the urea-formaldehyde (UF) adhesive at 0.5-1.5% by weight and applied to both surface and core chips, ensuring its distribution across all three layers of the particleboard. The AC exhibited a specific surface area of 572.14 m(2)/g and a total pore volume of 0.280 cm(3)/g, demonstrating its high porosity and adsorption capabilities. Mechanical test results of particleboard indicate that the inclusion of 1.5% AC increased MOR by 26% (from 10.02 N/mm(2) to 12.65 N/mm(2)) and MOE by 52% (from 1083.83 N/mm(2) to 1645.33 N/mm(2)), while IB rose from 0.41 N/mm(2) to 0.53 N/mm(2). Additionally, formaldehyde emissions of particleboard decreased significantly from 11.25 mg/100 g (control) to 8.01 mg/100 g at production (0th month) and further to 3.20 mg/100 g after 12 months. Based on TS EN 312 (2012) classification, the AC-modified panels at 1.0-1.5% met the requirements of P2 boards for general-purpose use in dry conditions, while also complying with the E1 formaldehyde emission standard. The orange peel waste-derived AC can serve as an effective additive in composite materials, simultaneously improving mechanical performance and meeting international environmental and safety standards.
