SUV ASOSIDAGI NANOSUYUQLIKLARNING KOLLOID BARQARORLIGIGA HARORATNING TA’SIRI: EKSPERIMENTAL TADQIQOT

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22 август 2025

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SUV ASOSIDAGI NANOSUYUQLIKLARNING KOLLOID BARQARORLIGIGA HARORATNING TA’SIRI: EKSPERIMENTAL TADQIQOT

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MUQOBIL ENERGETIKA

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MAQOLA ANNOTATSIYASI

Annotatsiya: Nanosuyuqliklarning issiqlik barqarorligi energiya tizimlarida qo‘llanilishi uchun muhim omildir, biroq harorat ta’sirida yuzaga keladigan agregatsiya mexanizmi hali to‘liq o‘rganilmagan. Ushbu tadqiqotda nanosuyuqliklar ikki bosqichli usulda, ya’ni 0.5 og‘irlik foizidagi Al₂O₃ zarrachalari distillangan suvda dispersiya qilinib, tayyorlanadi. TEM tahlili zarrachalarning asosan sferik shaklga ega bo‘lib, 10 dan 50 nm gacha o‘zgarishini ko‘rsatadi. DLS natijalari zarrachalar Z-o‘rtacha gidrodinamik diametri 103 nm bo‘lgan, D10 ≈ 80 nm, D50 ≈ 103 nm, D90 ≈ 154 nm bo‘lgan bir xillikda tarqalgan suspenziyani ko‘rsatadi. 25 °C, 35 °C va 45 °C haroratlarda zeta potensial qiymatlari mos ravishda 49.0 mV, 47.1 mV va 48.3 mV ni tashkil etadi, bu esa ±30 mV chegaradan ancha yuqori bo‘lib, kuchli elektrostatik barqarorlikni tasdiqlaydi. Nanosuyuqliklar harorat o‘zgarishlarida ham barqaror holatda qoladi va aglomeratsiya yoki cho‘kish xavfi kamligini bildiradi. Ushbu natijalar Al₂O₃ nanosuyuqliklarini quyosh issiqlik tizimlarida issiqlik uzatishni yaxshilash uchun istiqbolli vosita sifatida qo‘llash mumkinligini ko‘rsatadi. Usullar va materiallar: Nanosuyuqliklar ikki bosqichli (“Two-step”) usulda tayyorlanadi: 0.5 wt% miqdoridagi Al₂O₃ zarrachalari (Aerodisp W925, 25 wt.% suvda) distillangan suv bilan suyultirilib, xona haroratida 2–5 daqiqa davomida ultratovushli vanna yordamida dispersiya qilinadi. Zarrachalarning morfologiyasi TEM (transmissiyali elektron mikroskopiya) orqali tahlil qilinib, ularning 10–50 nm diapazondagi sferik yoki biroz notekis shaklda ekanligi aniqlanadi. Nanosuyuqliklarni tavsiflash uchun LiteSizer DLS 500 (Anton Paar) asbobida, 90° burchakda yon tomondan tarqatilgan nur asosida, DLS va zeta potensial usullari qo‘llaniladi. O‘lchovlar uch xil haroratda amalga oshiriladi. Natijalar: DLS tahlili Al₂O₃ nanosuyuqliklarida zarrachalar bir xilda tarqalganini ko‘rsatadi; Z-o‘rtacha gidrodinamik diametri 103 nm bo‘lib, D10 ≈ 80 nm, D50 ≈ 103 nm va D90 ≈ 154 nm ni tashkil qiladi, bu esa past polidisperslikni bildiradi. 25 °C, 35 °C va 45 °C haroratlarda o‘lchangan zeta potensial qiymatlari 49.0 mV, 47.1 mV va 48.3 mV ni tashkil etadi va bu qiymatlar ±30 mV dan yuqori bo‘lib, kuchli kolloid barqarorlikni ko‘rsatadi. Natijalar nanosuyuqliklarning agregatsiya va cho‘kishga chidamli ekanligini va turli harorat sharoitlarida barqaror qolishini ko‘rsatadi, bu esa ularni quyosh issiqlik tizimlarida samarali qo‘llash imkoniyatini beradi.

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Teglar

# 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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