Experimental investigation on the use of highly charged nanoparticles to improve the stability of weakly charged colloidal system

Zubir, Mohd Nashrul Mohd; Badarudin, A.; Kazi, S.N.; Misran, Misni; Amiri, Ahmad; Sadri, Rad; Khalid, Solangi

doi:10.1016/j.jcis.2015.05.019

Cited by 28 publications

(17 citation statements)

References 60 publications

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“…The essential demand for high-performance heat transfer fluids in a variety of applications and industries, particularly in the energy and electrical sectors, has motivated a lot of research 1 .…”

Section: Research Background and Motivationmentioning

confidence: 99%

Thermal Analysis Of Graphene Based Nanofluids For Energy System And Economic Feasibility

Mohammad

Aldlemy

Falah³

et al. 2022

Preprint

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Thermal and economic evaluation using covalent functionalized Graphene Nanoplatelets (CF-GNPs) were performed inside a heated-pipe under turbulent conditions. The current nanofluids were produced from CF-GNPs added and distilled water in different mass percentages such as 0.025,0.05,0.075 and 0.1wt.%. The thermal system was under the condition of fully-developed turbulent flow in the range of 6,401 ≤ Re ≤ 11,907 and heated up to 11,205 W/m2. The characterization and morphological properties were done through different examinations and techniques such as zeta potential, nanoparticle sizer, Field Emission Scanning Electron Microscopy (FE-SEM), and Field Emission Transmission Electron Microscope (FE-TEM). Moreover, the economic performance was evaluated to estimate the price-operation of the current thermal system. The heat exchanger size reduced by 16.10%, 21.92%, 25.37% and 29.35% for 0.025wt.%, 0.05wt.%, 0.075wt.% and 0.1wt.%, respectively. Furthermore, the required power for base fluid was 422W then reduced to 354W, 326W, 315W and 298W for 0.025wt.%, 0.05wt.%, 0.075wt.% and 0.1wt.%, respectively.

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Section: Research Background and Motivationmentioning

confidence: 99%

Thermal Analysis Of Graphene Based Nanofluids For Energy System And Economic Feasibility

Mohammad

Aldlemy

Falah³

et al. 2022

Preprint

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“…Nanofluids improve heating rates, reduce processing time, and extend the life of machinery, making them ideal for use in power, manufacturing, transportation, medical, microfluidics, and microelectronics [1,2]. Heat transfer efficiency is poor in engineering applications involving fluids, particularly when employing fluids such as engine oil (EO), ethylene glycol (EG), and water (DW), and research into alternatives is ongoing [3].…”

Section: Introduction 1research Backgroundmentioning

confidence: 99%

Frictional Pressure Drop and Cost Savings for Graphene Nanoplatelets Nanofluids in Turbulent Flow Environments

Mohammad

Aldlemy

Hassan³

et al. 2021

Nanomaterials

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Covalent-functionalized graphene nanoplatelets (CF-GNPs) inside a circular heated-pipe and the subsequent pressure decrease loss within a fully developed turbulent flow were discussed in this research. Four samples of nanofluids were prepared and investigated in the ranges of 0.025 wt.%, 0.05 wt.%, 0.075 wt.%, and 0.1 wt.%. Different tools such as field emission scanning electron microscopy (FE-SEM), ultraviolet-visible-spectrophotometer (UV-visible), energy-dispersive X-ray spectroscopy (EDX), zeta potential, and nanoparticle sizing were used for the data preparation. The thermophysical properties of the working fluids were experimentally determined using the testing conditions established via computational fluid dynamic (CFD) simulations that had been designed to solve governing equations involving distilled water (DW) and nanofluidic flows. The average error between the numerical solution and the Blasius formula was ~4.85%. Relative to the DW, the pressure dropped by 27.80% for 0.025 wt.%, 35.69% for 0.05 wt.%, 41.61% for 0.075 wt.%, and 47.04% for 0.1 wt.%. Meanwhile, the pumping power increased by 3.8% for 0.025 wt.%, 5.3% for 0.05 wt.%, 6.6% for 0.075%, and 7.8% for 0.1 wt.%. The research findings on the cost analysis demonstrated that the daily electric costs were USD 214, 350, 416, 482, and 558 for DW of 0.025 wt.%, 0.05 wt.%, 0.075 wt.%, and 0.1 wt.%, respectively.

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“…Subsequently, by using Monte Carlo simulations, Liu and coworkers showed the fundamental basis for the formation of the halo is that nanoparticles are trapped in a shallow energy well close to the colloidal particle at low nanoparticle concentrations ( 10 -4 ) [9], [10]. Following the Tohver et al experiments, nanoparticle haloing has been widely examined by a number of investigators [11], [12], [13], [14], [15], [16].…”

Section: Introductionmentioning

confidence: 99%

Tuning the stabilization mechanism of nanoparticle-regulated complex fluids

Moradi

Willing

2019

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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In nanoparticle haloing, charged nanoparticles have been found to enhance the stability of colloidal suspensions by forming a non-adsorbing layer surrounding neutral colloids which induces an electrostatic repulsion between them. However, there has been some debate that nanoparticles may directly deposit onto the colloidal surfaces and that the stabilization mechanism relies on nanoparticle adsorption. In this study, we have found that these two mechanisms control the stability of colloidal suspensions across a continuum over increasing nanoparticle concentrations.AFM force measurements showed that highly charged zirconia nanoparticles built up an electrostatic repulsion between negligibly charged silica surfaces, preventing them from aggregating. The follow-up adsorption measurements and force modeling indicated that minor adsorption of nanoparticles is expected at volume fractions of 10 -5 to 10 -3 , but the amount of nanoparticle adsorption dramatically increases with increasing the nanoparticle volume fraction beyond 10 -3 . Based on these results, we propose that the fundamental mechanism of nanoparticleregulated stabilization is nanoparticle haloing at low nanoparticle concentrations which transitions to adsorption at higher concentrations. Accordingly, at a nanoparticle volume fraction of around 10 -3 where the transition happens, the stabilization can be influenced by both nanoparticle haloing and adsorption.

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Experimental investigation on the use of highly charged nanoparticles to improve the stability of weakly charged colloidal system

Cited by 28 publications

References 60 publications

Thermal Analysis Of Graphene Based Nanofluids For Energy System And Economic Feasibility

Thermal Analysis Of Graphene Based Nanofluids For Energy System And Economic Feasibility

Frictional Pressure Drop and Cost Savings for Graphene Nanoplatelets Nanofluids in Turbulent Flow Environments

Tuning the stabilization mechanism of nanoparticle-regulated complex fluids

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