Viscosity and Tribology of Copper Oxide Nanofluids

Battez, A. Hernández; Viesca, J.L.; Rodríguez, Ramón; Rico, José Esteban Fernández

doi:10.1115/ijtc2008-71058

Cited by 5 publications

(3 citation statements)

References 11 publications

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“…Nanofluids represent a relatively new class of fluids, obtained by the dispersion of solid particles of nanometric dimensions in traditional solvents [1]. They have attracted considerable interest in recent years by the scientific community, thanks to promising improvements of various properties of the base fluids, such as heat exchange [2], 'pool boiling', that is the ability of nanoparticles contained in nanofluids to improve the heat transfer properties of water based fluids in conditions close to boiling, or to increase the critical heat flux [3], and tribological properties [4]. The potential applications of nanofluids are varied in all fields of technology, especially with regard to improving the efficiency of energy devices or reducing volumes and costs for heat exchange devices.…”

Section: Introductionmentioning

confidence: 99%

Tuning the thermal diffusivity of silver based nanofluids by controlling nanoparticle aggregation

Agresti¹,

Barison²,

Battiston³

et al. 2013

Nanotechnology

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With the aim of preparing stable nanofluids for heat exchange applications and to study the effect of surfactant on the aggregation of nanoparticles and thermal diffusivity, stable silver colloids were synthesized in water by a green method, reducing AgNO₃ with fructose in the presence of poly-vinylpyrollidone (PVP) of various molecular weights. A silver nanopowder was precipitated from the colloids and re-dispersed at 4 vol% in deionized water. The Ag colloids were characterized by UV-visible spectroscopy, combined dynamic light scattering and ζ-potential measurements, and laser flash thermal diffusivity. The Ag nanopowders were characterized by scanning electron microscopy and thermal gravimetric analysis. It was found that the molecular weight of PVP strongly affects the ζ-potential and the aggregation of nanoparticles, thereby affecting the thermal diffusivity of the obtained colloids. In particular, it was observed that on increasing the molecular weight of PVP the absolute value of the ζ-potential is reduced, leading to increased aggregation of nanoparticles. A clear relation was identified between thermal diffusivity and aggregation, showing higher thermal diffusivity for nanofluids having higher aggregation. A maximum improvement of thermal diffusivity by about 12% was found for nanofluids prepared with PVP having higher molecular weight.

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Section: Introductionmentioning

confidence: 99%

Tuning the thermal diffusivity of silver based nanofluids by controlling nanoparticle aggregation

Agresti¹,

Barison²,

Battiston³

et al. 2013

Nanotechnology

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“…The last nonseizure load (LNSL) is the last load at which the measured scar diameter is not higher than 5% above the compensation line [32]. The compensation line was obtained from a plot of the compensation scar diameters against the applied load.…”

Section: Methodsmentioning

confidence: 99%

Effect of nickel nanopowder on lubrication behaviour of low-temperature grease in steel-steel tribosystem

Zadoshenko

Burlakova

Новикова

2019

Tribology - Materials, Surfaces & Interfaces

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Nickel nanoparticles with sizes from 12 to 34 nm were obtained by pyrolysis of nickel formate. They have been used as additives to the low-temperature grease (CIATIM-201). Studies of tribotechnical properties have shown that the CIATIM-201 with nickel additives at concentrations of 0.05 wt. % -0.2 wt. % has the best antiwear and extreme pressure properties in comparison with pure grease. Friction surfaces were characterised by the methods of atomic-force microscopy AFM (PHYWE), 3D optical microscopy and indentation tests. The improvement of tribotechnical properties of grease is related to the process of micro-polishing, which leads to the formation of a structural layer with a high modulus of elasticity on the friction surface.

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“…El óxido de zinc (ZnO) es un compuesto químico inorgánico perteneciente al grupo de los semiconductores que constan de elementos metálicos y no metálicos enlazados entre sí principalmente por enlaces iónicos y/o covalentes. También actúa como acido o como base según la sustancia con la que reacciona, además puede disolverse en ácidos y es insoluble en agua (0.0004 g por cada 100 mL de agua a 17°) [1]. Es un sólido de color blanco, inodoro y de sabor amargo.…”

Section: -Introducciónunclassified

Caracterización morfológica de nanotubos de ZnO

Hernandez¹,

Villeda²,

Ayala³

2020

ESTR

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En este trabajo se presenta el procedimiento llevado a cabo para la síntesis de nanotubos de óxido de zinc (ZnO) y su correspondiente caracterización morfológica. Los nanotubos fueron sintetizados sobre sustratos previamente optimizados, los cuales se denominan "capa semilla" y también sobre vidrio, para efectos de comparación. La optimización de los substratos se realizó mediante el depósito de una película delgada de ZnO utilizando la técnica de rocío químico ultrasónico. El crecimiento de los nanotubos de ZnO se llevó a cabo mediante la técnica depósito por baño químico, en el cual, los substratos fueron sumergidos en dirección paralela al fondo del vaso de precipitado. Las muestras fueron estudiadas utilizando la microscopía de fuerza atómica para determinar sus características morfológicas. A diferencia de otros trabajos, la síntesis se realizó en un medio acuoso a partir del precursor de nitrato de zinc utilizando como controlador la monoetanolamina. Se observó que los nanotubos de forma hexagonal con tamaño uniforme crecieron únicamente sobre los substratos con el depósito de la capa semilla. La posición del substrato originó un crecimiento vertical y uniforme de los nanotubos en dirección normal al substrato. El tamaño promedio del diámetro de los nanotubos fue de 31.6 nm. y la razón de aspecto promedio de 2.59 nm.

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Viscosity and Tribology of Copper Oxide Nanofluids

Cited by 5 publications

References 11 publications

Tuning the thermal diffusivity of silver based nanofluids by controlling nanoparticle aggregation

Tuning the thermal diffusivity of silver based nanofluids by controlling nanoparticle aggregation

Effect of nickel nanopowder on lubrication behaviour of low-temperature grease in steel-steel tribosystem

Caracterización morfológica de nanotubos de ZnO

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