Ball Milled Graphene Nano Additives for Enhancing Sliding Contact in Vegetable Oil

Omrani, Emad; Siddaiah, Arpith; Moghadam, Afsaneh Dorri; Garg, Uma; Rohatgi, Pradeep K.; Menezes, Pradeep L.

doi:10.3390/nano11030610

Cited by 17 publications

(20 citation statements)

References 57 publications

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“…In recent years, the optical properties of colloidal suspensions (nanofluids) have been actively studied [ 1 , 2 , 3 , 4 , 5 , 6 ]. Researchers are particularly interested in nonlinear optical effects that are realized in such media.…”

Section: Introductionmentioning

confidence: 99%

Appearance of a Solitary Wave Particle Concentration in Nanofluids under a Light Field

et al. 2021

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In this study, the nonlinear dynamics of nanoparticle concentration in a colloidal suspension (nanofluid) were theoretically studied under the action of a light field with constant intensity by considering concentration convection. The heat and nanoparticle transfer processes that occur in this case are associated with the phenomenon of thermal diffusion, which is considered to be positive in our work. Two exact analytical solutions of a nonlinear Burgers-Huxley-type equation were derived and investigated, one of which was presented in the form of a solitary concentration wave. These solutions were derived considering the dependence of the coefficients of thermal conductivity, viscosity, and absorption of radiation on the nanoparticle concentration in the nanofluid. Furthermore, an expression was obtained for the solitary wave velocity, which depends on the absorption coefficient and intensity of the light wave. Numerical estimates of the concentration wave velocity for a specific nanofluid—water/silver—are given. The results of this study can be useful in the creation of next-generation solar collectors.

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Section: Introductionmentioning

confidence: 99%

Appearance of a Solitary Wave Particle Concentration in Nanofluids under a Light Field

et al. 2021

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“…However, when the GNP was added beyond the optimum concentration, it led to an increase in wear volume. This observation could be explained by a few reasons [19]. If…”

Section: Wear Volume Analysismentioning

confidence: 99%

“…However, when the GNP was added beyond the optimum concentration, it led to an increase in wear volume. This observation could be explained by a few reasons [19]. If the concentration of GNP was beyond the optimum composition, it could lower the lubrication of the nano lubricant due to agglomeration at the interface of the tribo-pair [19,49].…”

Section: Wear Volume Analysismentioning

confidence: 99%

“…The incorporation of nanoparticles into vegetable oils has now created a lot of interest amongst researchers and experimental studies have exhibited their multiple beneficial effects [11,18]. One of these effects is providing a lower coefficient of friction and lower wear [19,20]. One of the important attributes for superior lubrication properties of solid nanoparticles is their potential to shear between the interacting surfaces as well as due to their inherent layered structures [21].…”

Section: Introductionmentioning

confidence: 99%

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Synergistic Study of Solid Lubricant Nano-Additives Incorporated in canola oil for Enhancing Energy Efficiency and Sustainability

2021

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In recent years, with the development of eco-friendly lubricants, different vegetable oils have been studied and found to improve the overall tribological performance compared to petroleum-based oils. Being one of the commonly used vegetable oils, canola oil has become popular due to its non-toxicity and low cost. However, this bio-lubricant lacks tribological performance compared to petroleum-based oils. To improve its performance, sustainable solid additives such as graphene nanoplatelet (GNP) and hexagonal boron nitride (hBN) have recently gained the researcher’s attention. While incorporating nanomaterials in the oil as additives is a promising way to improve base oil’s performance, the excessive use of nanoparticles can introduce undesirable effects. This study investigated canola oil’s tribological performances with the addition of 0.5, 1.0, 1.5, and 2.0 wt.% GNP and 0.5, 1.0, and 1.5 wt.% hBN nanoparticles. The dynamic viscosities of these seven settings showed higher viscosity for GNP-incorporated oils compared to that with hBN. The boundary lubrication regime was targeted for the coefficient of friction (COF) and wear analyses during each pin on the disk test. It was observed that for the GNP, 1.5 wt.% provided the minimum COF (52% less than base oil), whereas, for the hBN, 1.0 wt.% provided the lowest (40% less than base oil) values. Based on these insights, three nano lubricant mixtures were formulated by incorporating both GNP and hBN settings in different ratios. These mixtures provided an optimum positive synergy by reducing 56% friction and 90% wear compared to the base oil. These percentage values were significantly more compared to both GNP and hBN based lubricants in their individual settings. These improvements in the mixture were due to a composite film formed which protected the interacting surfaces and also due to the polishing mechanisms. Therefore, incorporating both these nanoparticles in canola oil could reduce friction and wear and thus help in better energy conservation.

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“…Nanoformulations containing gold nanoparticles (AuNPs) associated with vegetable oils have received much attention because they can enhance permeation through the outermost layer of the skin, which enables, for instance, a transdermal delivery of AuNPs [ 17 ]. The permeation efficiency of nanoformulations can be modulated by NPs’ characteristics, such as shape, charge, and functionalization [ 18 , 19 ].…”

Section: Introductionmentioning

confidence: 99%

Eco-Friendly Production of AuNPs and Their Impact on the Oil Oxidative Stability

et al. 2021

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Vegetable oils have been used for different applications and, more recently, as an active host medium to obtain nanoparticles for employment in bionanotechnological applications. Nevertheless, oils are very susceptible to oxidation during production, storage, and transportation because of their chemical composition. Consequently, any modification in their production must be accompanied by an analysis of the oxidative stability. In this study, naked and biocompatible gold nanoparticles (AuNPs) were grown on sunflower oil during sputtering deposition using different deposition times. Size and morphology were determined by transmission electron microscopy (TEM) and their concentrations were found by inductively coupled plasma-optical emission spectroscopy (ICP-OES). Rancimat® method was employed to evaluate the AuNPs influence on the oxidative stability of the vegetable oil. Well-dispersed quasi-spherical NPs were produced with a mean diameter in the 2.9–3.7 nm range and they were concentration-dependent on the deposition time. A concentration of about 11 mg/L, 38 mg/L, and 225 mg/L of AuNPs was obtained for a deposition time of 5 min, 15 min, and 30 min, respectively. The results also revealed that AuNPs negatively affected the oxidative stability of the sunflower oil and exponentially reduced the induction period (IP) with the increase in AuNPs content. IP reductions of 63%, 77%, and 81% were determined for the AuNPs containing samples at 11 mg/L, 38 mg/L, and 225 mg/L. For the first time, it is reported that naked AuNPs promote the rapid degradation of vegetable oil and this points out the need for attention relative to the quality of vegetable oils used to host metal nanoparticles.

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Ball Milled Graphene Nano Additives for Enhancing Sliding Contact in Vegetable Oil

Cited by 17 publications

References 57 publications

Appearance of a Solitary Wave Particle Concentration in Nanofluids under a Light Field

Appearance of a Solitary Wave Particle Concentration in Nanofluids under a Light Field

Synergistic Study of Solid Lubricant Nano-Additives Incorporated in canola oil for Enhancing Energy Efficiency and Sustainability

Eco-Friendly Production of AuNPs and Their Impact on the Oil Oxidative Stability

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