Effect of electrostatic stabilization on thermal radiation transfer in nanosuspensions: Photo-thermal energy conversion applications

Al-Gebory, Layth; Mengüç, M. Pınar; Koşar, Ali; Şendur, Kürşat

doi:10.1016/j.renene.2017.12.043

Cited by 16 publications

(5 citation statements)

References 44 publications

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“…In general, ζ-potential values between ±30 and ±40 mV are considered indicative of moderate electrostatic stability, while values above ±40 mV evidence the electrostatic stability of NPs. Consequently, ζ-potential is widely used as a criterion for estimating the colloidal stability/instability of NP dispersions. − …”

Section: Introductionmentioning

confidence: 99%

Zeta Potential and Colloidal Stability Predictions for Inorganic Nanoparticle Dispersions: Effects of Experimental Conditions and Electrokinetic Models on the Interpretation of Results

et al. 2021

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In this work, a set of experimental electrophoretic mobility (μe) data was used to show how inappropriate selection of the electrokinetic model used to calculate the zeta potential (ζ-potential) can compromise the interpretation of the results for nanoparticles (NPs). The main consequences of using ζ-potential values as criteria to indicate the colloidal stability of NP dispersions are discussed based on DLVO interaction energy predictions. For this, magnetite (Fe3O4) NPs were synthesized and characterized as a model system for performing electrokinetic experiments. The results showed that the Fe3O4 NPs formed mass fractal aggregates in solution, so the ζ-potential could not be determined under ideal conditions when μe depends on the NP radius. In addition, the Dukhin number (Du) estimated from potentiometric titration results indicated that stagnant layer conduction (SLC) could not be neglected for this system. The electrokinetic models that do not consider SLC grossly underestimated the ζ-potential values for the Fe3O4 NPs. The DLVO interaction energy predictions for the colloidal stability of the Fe3O4 NP dispersions also depended on the electrokinetic model used to calculate the ζ-potential. The results obtained for the Fe3O4 NP dispersions also suggested that, contrary to many reports in the literature, high ζ-potential values do not necessarily reflect high colloidal stability for charge-stabilized NP dispersions.

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Section: Introductionmentioning

confidence: 99%

Zeta Potential and Colloidal Stability Predictions for Inorganic Nanoparticle Dispersions: Effects of Experimental Conditions and Electrokinetic Models on the Interpretation of Results

et al. 2021

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“…The effects of the repulsive and attractive forces are included in the stability ratio which is determined by dividing the rate of diffusion by the rate of interaction between the particles in NPSs [29]:…”

Section: Model Of Calculationmentioning

confidence: 99%

Temperature-dependent particle stability behavior and its effect on radiative transfer in water/SiO2 nanofluids

Al-Gebory

2021

Journal of Thermal Engineering

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Radiative transfer is one of the methods of energy transport that includes in a wide range of applications and we feel it in our daily lives. Thermal radiation transfer plays an effective role in the utilization of renewable energy. The radiative and optical properties, as well as the nature of the radiative scattering, are the basic principles of the thermal radiation transfer. The unique properties of nanofluids offer the unmatched potential for use in energy utilization, the working temperature has a dominant effect on the stability and radiative properties of such type of suspensions. In this research, the radiative transfer (optical properties, the independent and dependent scattering, and radiative properties) in water/SiO 2 nanofluids are investigated; taking into consideration the effect of working temperature on the stability of the particles. The effect of the temperature on the stability ratio and particle agglomeration is determined by estimating the radius of gyration of particle agglomerates using the scaling law based on the stability (DLVO) method. The single-scattering approximation (SSA) is used to calculate the radiative properties in the case of independent scattering, while the quasi-crystalline approximation (QCA) is used for this purpose in the case of dependent scattering. The results show that the temperature has a significant effect on the stability of particles and radiative transfer in nanofluids. It was observed by comparing the results from the two approximation methods in the Rayleigh regime. Particle size affects the physical and scattering cross-sectional areas which give a general understanding of the scattering mechanism from small to large particles.

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“…If the separation is too small compared to the thermal wavelength, then energy transfer exceeds the well-known classical Planck's law of the black-body radiation 1 . Several studies have shown that the radiative heat transfer between objects with planar geometry depends on the materials and could be manipulated by using anisotropic materials, layered materials, and covering objects with different material composition [2][3][4][5][6][7] . In addition to the separation distance, the radiative heat transfer in a dimer of nanoparticles depends on various properties of the constituent nanoparticles, including material composition 8,9 , size 10 , surface structure 11 , shape [12][13][14] , and relative orientation [15][16][17] .…”

Section: Introductionmentioning

confidence: 99%

“…Similarly, the plasmon hybridization picture can be used to tune the surface plasmon modes of spheres coated with a metallic layer. This is an exciting time for solar thermal collectors and energy management applications to manipulate the thermal flux by nanoparticles 20,21 . For such applications, novel ways for tuning the rate of energy transfer is important, and a unique method for this idea is through the use of core-shell nanoparticles (CSNPs).…”

Section: Introductionmentioning

confidence: 99%

Radiative heat transfer between core-shell nanoparticles

Nikbakht

2018

Journal of Quantitative Spectroscopy and Radiative Transfer

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Radiative heat transfer in systems with core-shell nanoparticles may exhibit not only a combination of disparate physical properties of its components but also further enhanced properties that arise from the synergistic properties of the core and shell components. We study the thermal conductance between two core-shell nanoparticles (CSNPs). The contribution of electric and magnetic dipole moments to the thermal conductance depend sensitively on the core and shell materials, and adjustable by core size and shell thickness. We predict that the radiative heat transfer in a dimer of Au@SiO2 CSNPs (i.e., silica-coated gold nanoparticles) could be enhanced several order of magnitude compared to bare Au nanoparticles. However, the reduction of several orders of magnitude in the heat transfer is possible between SiO2@Au CSNPs (i.e., silica as a core and gold as a shell) than that of uncoated SiO2 nanoparticles.

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Effect of electrostatic stabilization on thermal radiation transfer in nanosuspensions: Photo-thermal energy conversion applications

Cited by 16 publications

References 44 publications

Zeta Potential and Colloidal Stability Predictions for Inorganic Nanoparticle Dispersions: Effects of Experimental Conditions and Electrokinetic Models on the Interpretation of Results

Zeta Potential and Colloidal Stability Predictions for Inorganic Nanoparticle Dispersions: Effects of Experimental Conditions and Electrokinetic Models on the Interpretation of Results

Temperature-dependent particle stability behavior and its effect on radiative transfer in water/SiO2 nanofluids

Radiative heat transfer between core-shell nanoparticles

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