Effect of Temperature on the Nanoparticles Agglomerates Fluidization

Esmailpour, Ali Asghar; Zarghami, Reza; Mostoufi, Navid

doi:10.2991/msam-15.2015.55

Cited by 4 publications

(3 citation statements)

References 11 publications

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“…However, viscosity augmented as a function of nanoparticle concentration; an increase of up 36 per cent in viscosity at 75°C for the highest nanoparticle concentration (0.1 wt.%). Nanoparticles tend to agglomerate due to their high surface activity (Singh et al , 2015) and interparticle forces such as van der Waals (Issa et al , 2014; Shima et al , 2010; Taha-Tijerina et al , 2014) particularly when subjected to high temperatures and/or high concentrations (Esmailpour et al , 2015). It has been demonstrated (Nisha and Philip, 2013) that nanoparticles form fractal-like clusters or agglomerates throughout the nanofluid, percolating thermal energy along them.…”

Section: Resultsmentioning

confidence: 99%

Temperature dependence of the extreme-pressure behavior of CuO and TiO₂ nanoparticle additives in metal-forming polymeric lubricants

Peña-Parás

García-Pineda

Maldonado-Cortés

et al. 2017

ILT

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Purpose The purpose of this work is to investigate the effect of temperature on the extreme-pressure (EP) properties of CuO and TiO2 nanoparticle-filled polymeric lubricants for metal-forming processes. Design/methodology/approach This paper studies the effect of nanoparticle additives of CuO and TiO2 on the load-carrying capacity of a metal-forming polymer lubricant used for deep-drawing at varying temperatures. EP measurements are performed with a four-ball tribotester according to the ITeE-PIB Polish method for testing lubricants under scuffing conditions. Tests are run at 25, 40, 60 and 75°C to further decrease the lubricant film thickness and determine the effect on the load-carrying capacity and the tribological mechanisms of nanoparticles. The tribological mechanisms of nanoparticles is studied using energy dispersive spectrometry (EDS). Findings Results indicate that nanoparticle additives increase the load-carrying capacity of the polymeric lubricant at all concentrations up to 60°C attributed to a mending effect and a reduction in the area of contact of moving surfaces; at 75°C, the improvement is lowered due to nanoparticle re-agglomeration. The best results are found with TiO2 nanoparticles due to their smaller size compared to CuO. Practical implications Nanoparticles of CuO and TiO2 are potential EP additives for metal-forming lubricants, providing protection to working components and extending tool life. Originality/value These results show the effectiveness and the tribological mechanisms of nanoparticle additives under EP conditions and increasing temperatures found in metal-forming processes.

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Section: Resultsmentioning

confidence: 99%

Temperature dependence of the extreme-pressure behavior of CuO and TiO₂ nanoparticle additives in metal-forming polymeric lubricants

Peña-Parás

García-Pineda

Maldonado-Cortés

et al. 2017

ILT

View full text Add to dashboard Cite

show abstract

“…It is noteworthy that the contact angle measurements were conducted at 25 °C and the amounts of asphaltenic deposition generated from the microreactor and flow loop were obtained using a test temperature of >85 °C and in the presence of pressure. However, it is reported that LW interactions increase with the temperature, , EL interactions do not vary much with the temperature, and Lewis acid–base interaction parameters decrease inversely with the temperature . On the basis of this information, the Lewis acid–base interactions are negligible compared to LW and EL interactions at high temperatures.…”

mentioning

confidence: 90%

Reply to Comments on Investigation of Asphaltene Polydispersity, Stability, and Deposition on Steel Using XDLVO Theory

Nguyen,

Cao,

Pohl

et al. 2023

Energy Fuels

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The objective of our original paper was to use the extended Derjaguin−Landau−Verwey−Overbeek (XDLVO) theory to study the interaction between asphaltenes and the steel surface. In his comments, Yen claims that this manuscript lacks supporting data and some of the results published might be questionable. We disagree with his comments because they are based on a misinterpretation of analysis. However, we do agree that we should have provided more information on our analysis in the original paper. In our response, we focused on addressing these comments in detail. Furthermore, Yen would like to know more about the operating procedures of our microreactor and flow loop equipment. We considered that outlining detailed information in the manuscript would provide too much insight into our proprietary asphaltene test methodologies and would be detrimental to the main message of the paper. Obviously, we will maintain this stance in a direct reply to Yen being our competitor.

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“…The agglomeration transforms individual nanoparticles into combined nanoparticles. The combination of nanoparticles substantially increases the average size [132,133]. The increase in average size hinders the entry of these particles at the surface interactions.…”

Section: Temperaturementioning

confidence: 99%

Nanolubrication and tribological behaviour of the rolling process – a review

Sabar

Ghosh

2023

Surface Engineering

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The purpose of the present article is to dispense an extensive review of research works performed to observe the impacts of nanoparticles tribologically and rationalise the use of nanoparticles in metal rolling lubrication. The results of past experimental research were analysed based on tribological behaviour, lubricant characteristics, and rolling quality. Improvements in tribological behaviour, rolled surface characteristics and mechanical strength were illustrated in the present work. A specific concentration of nanoparticles in the base lubricant was discovered which provided beneficial outcomes. The oxide scale formed as an inevitable byproduct is suppressed by the nano-application. The nanoparticles served better in the rolling process in terms of temperature control due to the enhanced thermal conductivity of the base lubricant. The article advocates for the adoption of nanolubrication in replacement of traditional lubricating fluids in the rolling process. The article lastly presents future challenges and the potential of nanolubricants in engineering applications.

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Effect of Temperature on the Nanoparticles Agglomerates Fluidization

Cited by 4 publications

References 11 publications

Temperature dependence of the extreme-pressure behavior of CuO and TiO₂ nanoparticle additives in metal-forming polymeric lubricants

Temperature dependence of the extreme-pressure behavior of CuO and TiO₂ nanoparticle additives in metal-forming polymeric lubricants

Reply to Comments on Investigation of Asphaltene Polydispersity, Stability, and Deposition on Steel Using XDLVO Theory

Nanolubrication and tribological behaviour of the rolling process – a review

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Effect of Temperature on the Nanoparticles Agglomerates Fluidization

Cited by 4 publications

References 11 publications

Temperature dependence of the extreme-pressure behavior of CuO and TiO2 nanoparticle additives in metal-forming polymeric lubricants

Temperature dependence of the extreme-pressure behavior of CuO and TiO2 nanoparticle additives in metal-forming polymeric lubricants

Reply to Comments on Investigation of Asphaltene Polydispersity, Stability, and Deposition on Steel Using XDLVO Theory

Nanolubrication and tribological behaviour of the rolling process – a review

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Product

Resources

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Temperature dependence of the extreme-pressure behavior of CuO and TiO₂ nanoparticle additives in metal-forming polymeric lubricants

Temperature dependence of the extreme-pressure behavior of CuO and TiO₂ nanoparticle additives in metal-forming polymeric lubricants