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TEMPERATURE IMPACT ON COLLOIDAL STABILITY OF WATER-BASED NANOFLUIDS: EXPERIMENTAL STUDY

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ALTERNATIVE ENERGY

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Abstract: The thermal stability of nanofluids is critical for applications in energy systems, yet the role of temperature-induced aggregation remains poorly understood. The nanofluids are prepared using a two-step method with 0.5 wt% alumina nanoparticles dispersed in distilled water. TEM analysis shows particles ranging from 10 to 50 nm with mostly spherical shapes. DLS results indicate a uniform suspension with a Z-average hydrodynamic diameter of 103 nm and a narrow size distribution (D10 ≈ 80 nm, D50 ≈ 103 nm, D90 ≈ 154 nm). Zeta potential values at 25 °C, 35 °C, and 45 °C are 49.0 mV, 47.1 mV, and 48.3 mV, respectively, confirming strong electrostatic stability above the ±30 mV threshold. The nanofluids remain stable across the tested temperature range, suggesting minimal risk of agglomeration or sedimentation. These findings support the potential use of Al₂O₃ nanofluids to improve heat transfer in solar thermal systems. Methods and Materials: The nanofluids are prepared using a two-step method, where 0.5 wt% of Al₂O₃ nanoparticles (Aerodisp W925, 25 wt.% in water) are diluted in distilled water and dispersed using ultrasonic treatment for 2–5 minutes at room temperature. The morphology of the nanoparticles is examined using Transmission Electron Microscopy (TEM), revealing spherical to slightly irregular particles ranging from 10 to 50 nm. For characterization, Dynamic Light Scattering (DLS) and zeta potential measurements are performed using a LiteSizer DLS 500 (Anton Paar) with side-scattering at 90°, conducted at three different temperatures to assess particle size distribution and electrokinetic stability. Results: DLS analysis shows that the Al₂O₃ nanofluids have a uniform dispersion, with a Z-average hydrodynamic diameter of 103 nm and a narrow size distribution (D10 ≈ 80 nm, D50 ≈ 103 nm, D90 ≈ 154 nm), indicating low polydispersity. Zeta potential values measured at 25 °C, 35 °C, and 45 °C are 49.0 mV, 47.1 mV, and 48.3 mV, respectively, all exceeding the ±30 mV threshold, confirming high colloidal stability. These results suggest that the nanofluids resist agglomeration and sedimentation, maintaining stability across varying thermal conditions and demonstrating strong potential for use in solar thermal systems.

AUTHORS

T.Jurayev

O‘zbekiston Fanlar akademiyasi Fizika-texnika instituti

J.Axatov

O‘zbekiston Fanlar akademiyasi Fizika-texnika instituti

D.Jalilov

O‘zbekiston Fanlar akademiyasi Fizika-texnika instituti

A.Halimov

O‘zbekiston Fanlar akademiyasi Fizika-texnika instituti

Tags

# дзета-потенциал# nanofluids# наножидкости# nanosuyuqliklar# DLS# Zeta potential# solar thermal# солнечные тепловые системы# zeta potensial# quyosh issiqlik

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https://eroi.uz/11.0032/A0825-0028

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