Concentration and size dependence of nano-silver dispersed water based nanofluids

Paul, Gayatri; Sarkar, Sandip; Pal, Tuhin Subhra; Das, Prasanta Kumar; Manna, I.

doi:10.1016/j.jcis.2011.11.057

Cited by 73 publications

(26 citation statements)

References 50 publications

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“…Therefore, suppressing the aggregation of the nanoparticles in the nanofluid has become a major issue in the primary level of research for heat transfer applications. Many investigations have been carried out in addressing the issues related to the stability of the nanofluids [2,[4][5][6][7][8][9][10][11][12][13] and the thermal conductivity enhancement [14][15][16][17][18][19]. Experimental studies on the nanofluids have shown that the amount and the charge of nanoparticles in the nanofluid and the interaction between the nanoparticles and the dispersant influence the stability of the nanofluid directly.…”

Section: Introductionmentioning

confidence: 99%

Stability of Aqueous Nanofluids Containing PVP-Coated Silver Nanoparticles

Iyahraja¹,

Rajadurai²

2015

Arab J Sci Eng

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Nanofluids have opened a new arena for researchers in the field of heat transfer with their exceptional heat transfer characteristics. Enhanced thermal conductivity and improved stability are the principal advantages of nanofluids for its applications in heat transfer. This paper presents an experimental investigation on the stability of silver-water nanofluids prepared by dispersing 0.1 % volume fraction of polyvinylpyrrolidone-coated silver nanoparticles in distilled water with and without the addition of surfactants. The surfactants used in the present study are polyvinylpyrrolidone and sodium dodecyl sulfate. The stability of the nanofluids was estimated from sedimentation time, pH value, zeta potential and particle size distribution. Thermal conductivity of the nanofluids was measured by thermal property analyzer. It has been found that the stability of nanofluids is influenced predominantly by the size of the particle and the surfactant characteristics. The stability of nanofluid increases with the decrease in the size of nanoparticles. Also, the stability increases with sodium dodecyl sulfate as surfactant as against polyvinylpyrrolidone. However, enhancement in the thermal conductivity is found to be higher with polyvinylpyrrolidone than with sodium dodecyl sulfate.

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Section: Introductionmentioning

confidence: 99%

Stability of Aqueous Nanofluids Containing PVP-Coated Silver Nanoparticles

Iyahraja¹,

Rajadurai²

2015

Arab J Sci Eng

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“…The superior performance of multilayer GNPs over CNTs in serving as a thermal conductivity filler for preparing composite thermal interface materials has also been exhibited by Liang et al [16]. [17][18][19][20][21][22][23][24][25][26][27][28][29]. The adopted Ag nanoparticles, however, were almost all spherical and the size effect was only rarely concerned [25,29].…”

Section: Introductionmentioning

confidence: 86%

“…[17][18][19][20][21][22][23][24][25][26][27][28][29]. The adopted Ag nanoparticles, however, were almost all spherical and the size effect was only rarely concerned [25,29]. Given the availability of Ag nanoparticles of a variety of shapes, wires, cubes and plates for example, afforded by shape-controlled synthesis [30], there is a lack of examination on the shape effect of Ag nanoparticles on the thermal conductivity of nanofiuids.…”

Section: Introductionmentioning

confidence: 99%

Thermal Conductivity Enhancement of Ethylene Glycol-Based Suspensions in the Presence of Silver Nanoparticles of Various Shapes

Fang¹,

Ding²,

Fan

et al. 2013

Journal of Heat Transfer

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In this technical brief, the effect of adding silver (Ag) nanoparticles of various shapes on the thermal conductivity enhancement of ethylene glycol (EG)-based suspensions was investigated experimentally. These included Ag nanospheres (Ag NSs), Ag nanowires (Ag NWs), and Ag nanofiakes (Ag NFs). Measurements of the thermal conductivity of the suspensions were performed from 10 to 30 °C at an increment of 5 °C. It was shown that the thermal conductivity of the EG-based suspensions increases with raising the temperature. The Ag NWs of a high aspect ratio (^500) caused greatest relative enhancement up to 15.6% at the highest loading of nearly 0.1 vol. %, whereas the other tn'o shapes of nanoparticles, Ag NSs and Ag NFs with much smaller aspect ratios, only led to enhancements up to 5%. The formation ofa network of Ag NWs that facilitates heat conduction was likely responsible for their better performance. The relative enhancement was also predicted by the Hamilton-Crosser model that takes the particle shape effect into consideration. It was shown that the predictions far underestimate the thermal conductivity enhancements but are qualitatively consistent with their shape dependence. As a penalty, however, the presence of Ag NWs was shown to give rise to significant increase in the viscosity of the EG-based suspensions.

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“…The silica nanofiller with different concentrations of 0.1% and 0.05% mass fraction were added to the 100% by weight of base fluid to study the effect of nanoparticles concentration. To achieve low humidity of transformer oil, the samples were dried for at least 24 hours in a vacuum oven at 60ºC [12]. Figure 2 shows the nanofluids condition between untreated and treated silica nanofluids.…”

Section: Nanofluids Preparationmentioning

confidence: 99%

Characteristics of Mineral Oil-based Nanofluids for Power Transformer Application

Zakaria

Ahmad

Arief

et al. 2017

IJECE

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Trends in the field of nanomaterial-based transformer oil show most of the conducted works have focused only on the transformer oil-based nanofluids but limited studies on the stability of transformer oil-based nanofluids. Since mineral oil-based nanofluids still can produce the sedimentation, thus the cold-atmospheric pressure plasma method is proposed to functionally modify the Silicon Dioxide (SiO 2 ) nanofiller in order to enhance the electrical properties of the mineral oil-based nanofluids. The AC breakdown strength oil samples before and after modification were measured. It was found that the plasma treated nanofluids have higher AC breakdown voltage compared to pure oil and untreated nanofluids. Also, Fourier Transform Infrared (FTIR) Spectroscopy has been used in this study to analyse the physical changes of oil samples. It is envisaged that the added silica nanofiller has significant effect on electrical properties of the transformer oil-based nanofluids which would enable to the development of an improved class of liquid dielectric for the application of power transformer.

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Concentration and size dependence of nano-silver dispersed water based nanofluids

Cited by 73 publications

References 50 publications

Stability of Aqueous Nanofluids Containing PVP-Coated Silver Nanoparticles

Stability of Aqueous Nanofluids Containing PVP-Coated Silver Nanoparticles

Thermal Conductivity Enhancement of Ethylene Glycol-Based Suspensions in the Presence of Silver Nanoparticles of Various Shapes

Characteristics of Mineral Oil-based Nanofluids for Power Transformer Application

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