Preparation and characterization of sub-micron dispersions of sand in ethylene glycol-water mixture

Journal, Brazilian; Manikandan, S.; Karthikeyan, N.; Suganthi, K.S.; Rajan, K.S.

doi:10.1590/s0104-66322012000400003

Cited by 17 publications

(2 citation statements)

References 52 publications

(65 reference statements)

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“…[2][3][4][5][6] However, in majority of cases, enhancement in thermal conductivity is accompanied by increase in viscosity also. [7][8][9][10][11][12][13][14][15] In addition, the increase in thermal conductivity is overshadowed by increase in viscosity due to higher magnitude of the later. [16][17][18][19] It has been recently shown that the transport properties of propylene glycol-based nanouids could be improved through adoption of appropriate two-step method for formulation of nanouids.…”

Section: Introductionmentioning

confidence: 99%

Rapid synthesis of MgO nanoparticles & their utilization for formulation of a propylene glycol based nanofluid with superior transport properties

Manikandan

Rajan

2014

RSC Adv.

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Section: Introductionmentioning

confidence: 99%

Rapid synthesis of MgO nanoparticles & their utilization for formulation of a propylene glycol based nanofluid with superior transport properties

Manikandan

Rajan

2014

RSC Adv.

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“…Despite such high degree of clustering, colloidal stability is ensured by high viscosity of base fluid, which retards the settling of particles. 20 With clusters of MWCNT, the total length of highly conductive path is more leading to rapid thermal transport. Hence, correlating the non-linear increase in viscosity with MWCNT concentration and the thermal conductivity enhancements greater than those predicted by conventional theories, particle clustering is likely to be the dominant mechanism for thermal conductivity enhancement.…”

mentioning

confidence: 99%

Mechanistic Investigations of Viscosity and Thermal Conductivity Enhancement in Multi-Walled Carbon Nanotubes-Propylene Glycol Nanofluids

Mary¹,

Suganthi²,

Rajan³

2013

Nanosci Nanotechnol Lett

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Experiments were performed on the formulation of MWCNT-Propylene glycol nanofluid through acid-treatment of MWCNT followed by ultrasonication. While acid-treatment introduced hydrophilic groups to facilitate dispersion in a polar liquid like propylene glycol, probe ultrasonication contributed to de-agglomeration of large clusters. The viscosity of acid-treated MWCNT-propylene glycol increases non-linearly with MWCNT volume concentration due to high aspect ratio and clustering. The analysis of viscosity and thermal conductivity data as a function of MWCNT concentration and temperature reveal the role of particle clustering in thermal conductivity enhancement. The nanofluid maintains colloidal stability even at temperatures as high as 140 C.Heating and cooling find extensive application in process industries and manufacturing industries. 1-2 Cooling is important for functioning of automobile engines, highpower electronic devices, laser mirrors, etc. 2-3 Apart from thermal conductivity and specific heat, the efficiency of a cooling operation involving liquid coolants is influenced by viscosity also. With the successful dispersion of solid nanostructures of materials possessing higher thermal conductivity in liquid coolants like water, ethylene glycol-water mixture, Therminol-55 ® , etc., a novel class of higher thermal conductivity coolants, nanofluids can be prepared. 4-6 It is widely acknowledged that the thermal conductivity enhancement of nanofluids over that of fluid in which nanostructures are dispersed (base fluid) is higher with nanostructures of high aspect ratio and higher thermal conductivity. 4 7 8 Multi-walled carbon nanotubes (MWCNT) are high aspect ratio nanostructures with thermal conductivity of the order of 10 3 W/mK, many times greater than that of common coolants. 9 A majority of common coolants is polar and direct dispersion of MWCNT in polar coolants is difficult due to hydrophobic nature of MWCNT. Acid-treatment of MWCNT introduces hydrophilic groups on MWCNT surface, which enables the dispersion of acid-treated MWCNT in water. 10 Though water is the most-widely used coolant, they are unsuitable * Author to whom correspondence should be addressed.for cooling duty below the freezing point of water. Hence mixtures like ethylene glycol-water and propylene glycolwater are used for such cooling applications. 11 Ethylene glycol has better transport properties compared to that of propylene glycol. 11 However, the later is preferred for applications in food industry and in solar heaters, where toxicity is a concern. The present communication reports the influence of MWCNT concentration (0.1-0.5 vol%) and temperature (30-140 C) on viscosity and thermal conductivity of MWCNT-propylene glycol nanofluids and elucidates the mechanism of thermal conductivity and viscosity enhancement.Multiwalled carbon nanotubes of 5-15 m long and 50 nm in outer were procured from M/s Amorphous and Nanostructured Materials Inc., USA. The as-received MWCNT were subjected to acid treatment in 46% concentrated HNO 3 solution w...

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Transport properties of nano manganese ferrite–propylene glycol dispersion (nanofluids): new observations and discussion

2013

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Preparation and characterization of sub-micron dispersions of sand in ethylene glycol-water mixture

Cited by 17 publications

References 52 publications

Rapid synthesis of MgO nanoparticles & their utilization for formulation of a propylene glycol based nanofluid with superior transport properties

Rapid synthesis of MgO nanoparticles & their utilization for formulation of a propylene glycol based nanofluid with superior transport properties

Mechanistic Investigations of Viscosity and Thermal Conductivity Enhancement in Multi-Walled Carbon Nanotubes-Propylene Glycol Nanofluids

Transport properties of nano manganese ferrite–propylene glycol dispersion (nanofluids): new observations and discussion

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