The effect of pH on particle agglomeration and optical properties of nanoparticle suspensions

Al-Gebory, Layth; Mengüç, M. Pınar

doi:10.1016/j.jqsrt.2018.07.020

Cited by 26 publications

(11 citation statements)

References 42 publications

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“…Indeed, the scattering becomes significant when there is a high difference between the refractive index of the medium and the particle, and when the wavelength and the particle size approach each other. The radiation scattering of nanofluids in this study is compared with other results from the literature based on experimental investigations, a good agreement was found between them [2,37]. The scattering behavior in these papers were obtained experimentally for different hydrodynamic particle size obtained from the dynamic light scattering technique.…”

Section: Resultssupporting

confidence: 71%

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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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Section: Resultssupporting

confidence: 71%

“…Particle stability means that collisions and agglomeration do not occur on a large scale. Therefore, as long as the particles remain unagglomerated or if particle agglomerates size can be controlled, it is possible to have stable nanofluids [2].…”

Section: Introductionmentioning

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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“…Any particles with ζ potential closer to the isoelectric point (pH zcp ) are unstable and tend to agglomerate (approximately in the range +30 to −30 mV). 62 This must be the reason for the significant increase (from ∼700 to ∼1600 nm) in the particle size of Cr-MOF at pH 6 and 8, with ζ potential ranging from +10 to −10 mV. The size of PSNPs was in the range 60−70 nm throughout the pH range and at both 5 and 70 ppm concentrations, which states the negligible effect of pH and concentration on the particle size of PSNPs.…”

Section: Structural Characteristicsmentioning

confidence: 92%

Nanoplastics Removal from Water using Metal–Organic Framework: Investigation of Adsorption Mechanisms, Kinetics, and Effective Environmental Parameters

Modak

Kasula

Esfahani

2023

ACS Appl. Eng. Mater.

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Nanoplastics are becoming a concern for the environment and are gaining significant attention due to their challenging removal process and ability to transport coexisting pollutants. Because of their mobility, small size (<1 μm), and accumulation tendency, nanoplastics are toxic for terrestrial and aquatic living organisms and humans, causing inflammation and oxidative stress. In this study, we investigated the removal of polystyrene nanoplastics (PSNPs) from water using a chromiumbased metal−organic framework (Cr-MOF/MIL-101). Cr-MOF was synthesized via a hydrothermal method using chromium nitrate and terephthalic acid and characterized via different analytical approaches. A 96% removal efficiency was achieved with initial concentrations of 5 and 70 ppm and adsorption kinetics followed the pseudo-first-order model. The adsorption isotherm at room temperature was best fitted with the Freundlich adsorption model, and the maximum adsorption capacity of 800 mg/g was achieved. The electrostatic interaction between PSNPs and Cr-MOF was the most dominating mechanism responsible for adsorption. The Cr-MOF showed acceptable regeneration capacity for cyclic removal of PSNPs.

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“…Using the Debye‐Scherrer formula (Equation ), the measured crystallite sizes for pH values of 5, 7, 8, and 9 were 20, 32, 25, and 27 nm, respectively. Additional impurity peaks were found in the spectra for pH values of 8 and 9, which may be attributed to partial crystallization, crystal defect formation, or partially ordered crystalline structures 40,41 . A single‐phase orthorhombic (MoO 3 ) structure develops in highly acidic (pH = 5) and neutral (pH = 7) media owing to the strong contact between the precursor ions.…”

Section: Resultsmentioning

confidence: 99%

High‐performanceMoO₃supercapacitor electrodes: Influence of reaction parameters on phase, microstructure, and electrochemical properties

Prakash

Dhananjaya

et al. 2021

Intl J of Energy Research

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Summary A simple solution combustion technique was employed to synthesize nanocrystalline MoO3, and the influence of the fuel‐to‐oxidizer ratio (F/O ratio, from 1:2 to 1:5) and pH (from 5 to 9) was investigated on the phase, particle size, and morphology, while keeping the combustion temperature constant at 500°C. By varying the F/O ratio and pH, different phases, namely, triclinic, monoclinic, hexagonal, and orthorhombic, were produced. The morphological features were observed to change from agglomerated nonuniform particles to uniform rod‐like morphology, with particle sizes ranging from 50 to 100 nm. Based on the microstructural and electrochemical results, 1D α‐MoO3 single‐phase nanorods synthesized at a F/O ratio of 1:5 and pH = 7 delivered a high specific capacitance of 814 F/g at 1 A/g current density with excellent cycling stability.

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The effect of pH on particle agglomeration and optical properties of nanoparticle suspensions

Cited by 26 publications

References 42 publications

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

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

Nanoplastics Removal from Water using Metal–Organic Framework: Investigation of Adsorption Mechanisms, Kinetics, and Effective Environmental Parameters

High‐performanceMoO₃supercapacitor electrodes: Influence of reaction parameters on phase, microstructure, and electrochemical properties

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The effect of pH on particle agglomeration and optical properties of nanoparticle suspensions

Cited by 26 publications

References 42 publications

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

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

Nanoplastics Removal from Water using Metal–Organic Framework: Investigation of Adsorption Mechanisms, Kinetics, and Effective Environmental Parameters

High‐performanceMoO3supercapacitor electrodes: Influence of reaction parameters on phase, microstructure, and electrochemical properties

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Product

Resources

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High‐performanceMoO₃supercapacitor electrodes: Influence of reaction parameters on phase, microstructure, and electrochemical properties