Yazar "Er, Yusuf" seçeneğine göre listele

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    Characterisation and energy storage performance of 3D printed-photocurable resin/microencapsulated phase change material composite
    (Elsevier, 2024) Er, Yusuf; Guler, Onur; Ustaoglu, Abid; Hekimoglu, Gokhan; Sari, Ahmet; Subasi, Serkan; Gencel, Osman
    The 3D fabrication of microencapsulated phase change material (MEPCM) doped resin polymer composites enables the creation of complex shapes and customized designs, opening doors for many applications in fields. This investigation fabricated a range of resin/MEPCM (20 %, 30 %, and 40 % by volume) composites using a mechanical mixing technique. This study investigates how the addition of MEPCM impacts resin matrix composite's mechanical strength, latent heat storage characteristics, and ability to regulate temperature effectively. With a 40 % MEPCM additive ratio, a pure resin porosity value of approximately 0.4 % increased to around 17 %. Thanks to the production of homogeneously dispersed MEPCM added resins with production with stereolithography (SLA), 40 % MEPCM additive enabled characteristic FTIR peaks of both MEPCM and resin to appear and, melting and solidification enthalpy values reached 87.15 j/g and 86.25 j/g, respectively. MEPCM addition enhanced the thermoregulatory properties of resin by absorbing or releasing heat during temperature fluctuations. On hotter days, 8 mm-thick composites create temperature differences exceeding 11 C, while this difference exceeds 6 C in the room center case. The produced 3D printed MEPCM/resin composite can be a potential material to effectively regulate the temperature of electronic devices, food packets, building materials, and electronic devices and automotive components.
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    Production and assessment of UV-cured resin coated stearyl alcohol/ expanded graphite as novel shape-stable composite phase change material for thermal energy storage
    (Pergamon-Elsevier Science Ltd, 2024) Guler, Onur; Er, Yusuf; Hekimoglu, Gokhan; Ustaoglu, Abid; Sari, Ahmet; Subasi, Serkan; Marasli, Muhammed
    Expanded graphite -phase change materials (PCM) structures are reinforced to polymers with various methods to fabricate advanced thermal energy storage materials. However, these methods still suffer from processing time and product efficiency challenges. In this study, the UV-curing method was used to produce shape-stable EGPCM-reinforced resin composites with fast curing and low process temperature of the resin. The composite material, comprising UV -curable resin (30 %), stearyl alcohol (65 %), and Expanded graphite (5 %), was synthesized. This synthesis aimed to address the limitations of traditional PCMs, such as low thermal conductivity and leakage. Differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) were used to characterize the materials ' phase change behavior and thermal stability. Scanning electron microscopy (SEM) and Fourier-transform infrared spectroscopy (FTIR) analyses were conducted to elucidate the microstructure and crystallinity of composite materials. The composites, exhibiting near-perfect impermeability with leakage as minimal as 0.89 %, not only enable the attainment of cooler environments by 2 - 3 degrees C under hot air conditions but also demonstrate exceptional thermal stability up to 207 degrees C, as evidenced by TGA results. Additionally, they offer a remarkable melting enthalpy value of 153.1 J/g. These composites, with their shape-retention ability during phase transitions and high thermal energy storage capacity, are a versatile and efficient option for sustainable energy management. This research contributes to the development of innovative materials for renewable energy integration and reducing carbon emissions.
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    Replacing natural aggregates with phase change material-based 3D printed aggregates in concrete for structural function and dual thermal energy storage
    (Elsevier, 2026) Gencel, Osman; Er, Yusuf; Guler, Onur; Ustaoglu, Abid; Sari, Ahmet; Subasi, Serkan; Marasli, Muhammed
    Extraction of natural aggregates for concrete not only depletes non-renewable resources but also causes habitat loss, groundwater disruption, and carbon emissions. At the same time, sustainable and energy-efficient construction demands materials capable of reducing operational energy. Integrating phase change materials (PCMs) into cementitious systems is promising for passive thermal regulation, yet conventional methods (microencapsulation, coatings) suffer from leakage, poor dispersion, and weak bonding. This study proposes replacing natural stone with 3D-printed smart aggregates embedding 50 wt% methyl palmitate (MP), combining structural compatibility with latent-heat storage. Concretes with natural aggregates (NA), synthetic aggregates (AA), and PCM-integrated aggregates (AAPCM) were compared in this study. At 28 days, compressive strength dropped from 92.99 MPa (NA) to 58.39 MPa (AA) and 44.34 MPa (AAPCM); ultrasonic pulse velocity decreased from 4.49 to 4.26 to 3.91 km/s. Thermal conductivity reduced by similar to 52% (1.26 -> 0.606 W/mK). DSC confirmed latent-heat storage of 224 J/g (MP) and 109 J/g (AAPCM) with >99% retention after 500 cycles. Outdoor tests showed up to 5 degrees C surface cooling and delayed heat release near 26 degrees C. Thus, PCM-integrated aggregates mitigate the environmental burden of quarrying while delivering thermally adaptive concretes, suitable for fa & ccedil;ades, pavements, and energy-resilient building envelopes.