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Effect of Dispersion Method on Stability and Dielectric Strength of Transformer Oil-Based TiO 2 Nanofluids

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ABSTRACT

Dispersion stability of nanoparticles in the liquid media is of great importance to the utilization in practice. This study aims to investigate the effects of mechanical dispersion method on the dispersibility of functionalized TiO2 nanoparticles in the transformer oil. Dispersion methods, including stirring, ultrasonic bath, and probe processes, were systematically tested to verify their versatility for preparing stable nanofluid. The test results reveal that the combination of ultrasonic bath process and stirring method has the best dispersion efficiency and the obtained nanofluid possesses the highest AC breakdown strength. Specifically, after aging for 168 h, the size of nanoparticles in the nanofluid prepared by the combination method has no obvious change, while those obtained by the other three paths are increased obviously.

No MeSH data available.


FT-IR spectrum of as-prepared TiO2 nanoparticles
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Fig3: FT-IR spectrum of as-prepared TiO2 nanoparticles

Mentions: The FT-IR spectrum of as-prepared TiO2 nanoparticles is depicted in Fig. 3. The IR peak around 500 cm-1 is attributed to the TiO2, whereas the absorption peaks related with the functional group of oleic acid are at higher bands [19, 20]. The transmission bands at 3301 and 1060 cm-1 are due to the presence of hydroxyl group (–OH). The bands in the 2919 and 2850 cm-1 region are associated with the asymmetric and symmetric –CH2– and –CH3 modes of the oleic acid-saturated chain fragments. The extra peaks around 902 and 1168 cm-1 can be assigned to stretching vibration of –C–O– groups [21]. It should be note that the peak at 1717 cm-1 associated with the C=O stretching mode is not observed in the spectrum [22]. This means that no free physically absorbed oleic acid exists in the nanoparticles.Fig. 3


Effect of Dispersion Method on Stability and Dielectric Strength of Transformer Oil-Based TiO 2 Nanofluids
FT-IR spectrum of as-prepared TiO2 nanoparticles
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5121108&req=5

Fig3: FT-IR spectrum of as-prepared TiO2 nanoparticles
Mentions: The FT-IR spectrum of as-prepared TiO2 nanoparticles is depicted in Fig. 3. The IR peak around 500 cm-1 is attributed to the TiO2, whereas the absorption peaks related with the functional group of oleic acid are at higher bands [19, 20]. The transmission bands at 3301 and 1060 cm-1 are due to the presence of hydroxyl group (–OH). The bands in the 2919 and 2850 cm-1 region are associated with the asymmetric and symmetric –CH2– and –CH3 modes of the oleic acid-saturated chain fragments. The extra peaks around 902 and 1168 cm-1 can be assigned to stretching vibration of –C–O– groups [21]. It should be note that the peak at 1717 cm-1 associated with the C=O stretching mode is not observed in the spectrum [22]. This means that no free physically absorbed oleic acid exists in the nanoparticles.Fig. 3

View Article: PubMed Central - PubMed

ABSTRACT

Dispersion stability of nanoparticles in the liquid media is of great importance to the utilization in practice. This study aims to investigate the effects of mechanical dispersion method on the dispersibility of functionalized TiO2 nanoparticles in the transformer oil. Dispersion methods, including stirring, ultrasonic bath, and probe processes, were systematically tested to verify their versatility for preparing stable nanofluid. The test results reveal that the combination of ultrasonic bath process and stirring method has the best dispersion efficiency and the obtained nanofluid possesses the highest AC breakdown strength. Specifically, after aging for 168 h, the size of nanoparticles in the nanofluid prepared by the combination method has no obvious change, while those obtained by the other three paths are increased obviously.

No MeSH data available.