Effect of calcination temperature during synthesis of Al2O3 from local bauxite on stability and CHF of water-Al2O3 nanofluids

Syarif, Dani Gustaman; Prajitno, Djoko Hadi; Pane, Jupiter Sitorus

doi:10.1007/s41779-017-0125-8

Cited by 14 publications

(11 citation statements)

References 13 publications

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“…3, the stronger broadening bands from 400 to 1000 cm −1 for -Al-OH and -O-Al-O-Al-correspond to the characteristic vibration of Al2O3. The same characteristic was found in a work of Khazaei et al [17] and in our previous study [2,[13][14][15]. Fig.…”

Section: Resultssupporting

confidence: 90%

“…At least until 19 days the nanofluid was very stable. Compared to the zeta potential of our nanofluids in our previous studies [2,[13][14][15], the zeta potential in this work is larger, means that the nanofluid in this study is more stable than the nanofluids in previous studies [2,[13][14][15]. The large the repulsion force on the nanoparticles, the large the zeta potential.…”

Section: Resultsmentioning

confidence: 51%

“…Base on the XRD pattern of Fig. 3, a calculation was performed employing Debye Scherrer method [2,14] represented in Equation (3). From the calculation it was known that the average crystallite size is 3.4 nm.…”

Section: Resultsmentioning

confidence: 99%

“…Pictures of visual appearance of the nanofluids were taken by using a digital camera. Critical Heat Flux (CHF) of the nanofluids was measured using a method described in [2,[13][14][15] utilizing Cu wire with diameter of 0.1 mm. CHF enhancement is calculated using equation (2).…”

Section: B Nanofluids Preparation and Characterizationmentioning

confidence: 99%

“…Currently nanofluids have been studied throughout the world. Various nanoparticles have been synthesized for the nanofluids such as Al2O3 [2][3][4][5], ZrO2 [6], ZnO [7], Fe2O3 [8,9], Fe3O4 [10], carbon nanotubes [11], and graphene [12]. Meanwhile some of the basic fluids used are water and ethylene glycol.…”

Section: Introductionmentioning

confidence: 99%

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Nanofluids with Enhanced CHF Prepared from Solgel Synthesized Al2O3 Nanoparticles Utilizing Urea as Chelating Agent

Syarif¹,

Prajitno²,

Pane³

2018

Proceedings of the International Conference on Science and Technology (ICST 2018)

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In order to develop a new coolant for nuclear and non-nuclear applications, nanoparticles of Al2O3 for nanofluids have been successfully synthesized by solgel method utilizing AlCl3 as precursor and urea as chelating agent. The mole ratio of the AlCl3 and urea was 1:2. The solution was stirred to form a sol and then was heated at 150 o C until forming a gel. The gel was then calcined at 500 o C for 1 hour to get Al2O3 nanoparticles. Nanofluids of Al2O3 were prepared by dispersing the Al2O3 nanoparticles into water as base fluid. The synthesized Al2O3 nanoparticles crystallized in gamma phase with crystallite size of 3.4 nm as confirmed by the XRD analyses. Specific surface area of the nanoparticles was 251 m 2 /g with dBET of 6 nm. As confirmed by TEM analyses, the particle size of the nanoparticles was 35 nm. The nanofluid with concentration of 0.05 vol % and pH of 7.42 possessed zeta potential of 53 mV, indicating a stable suspension. This nanofluid had a CHF enhancement of 92% compared to water as base fluid.

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Section: Resultssupporting

confidence: 90%