Interactions between nanoparticles in nanosuspension

Kovalchuk, N. M.; Johnson, Daniel J.; Соболев, В. Д.; Hilal, Nidal; Starov, Victor

doi:10.1016/j.cis.2019.102020

Cited by 32 publications

(28 citation statements)

References 71 publications

(83 reference statements)

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“…As in the present work the volume concentration of particles is limited to 0.02% and the maximum colloid size below 1 μm. Therefore, the Derjaguin approximation can describe the interactive forces among the particles which resulted the agglomeration state 51 . Similar observations of clustering and NPs adsorption effects have been reported in literature 11 .…”

Section: Resultssupporting

confidence: 75%

“…Therefore, the Derjaguin approximation can describe the interactive forces among the particles which resulted the agglomeration state. 51 Similar observations of clustering and NPs adsorption effects have been reported in literature. 11 Moreover, the temperature sweep had not shown any considerable effect on the colloidal agglomeration due to the small concentration of NFs considered in the present work.…”

Section: Stability Of Nfssupporting

confidence: 86%

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Thermal conductivity, rheology and stability analysis of 2D tungsten disulphide‐doped polyaniline‐based nanofluids: An experimental investigation

et al. 2020

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Summary In this study, polyaniline (PANI) nanocomposite‐based nanofluids (NFs) in ethylene glycol were obtained with a two‐step method by varying volume concentrations from 0.005% to 0.02%. Tungsten disulphide (WS2) nanoparticles were doped in PANI having different weight percentage (1%, 2% and 5%) via oxidative in situ polymerization employing ammonium persulphate oxidant in an acidic environment. The nanocomposites were comprehensively characterised using various techniques, such as Fourier transform infrared spectroscopy, thermogravimetric analysis, field emission scanning electron microscopy and high‐resolution transmission electron microscopy. The formulated NFs were extensively investigated with zeta‐sizer, particle size analyzer, thermal property analyzer and rheometer in a temperature range of 25°C to 70°C. The zeta potential results (up to 54.5 mV) were evident of extraordinary stability of NFs at all targeted temperatures along with polydispersity index <30% and mean particle/agglomerate size in the range of 335.8 to 489 nm. Additionally, a remarkable thermal conductivity improvement (~20.7%) was achieved with intrinsic PANI‐based NFs at an operating temperature of 50°C. Subsequently, it varied substantially with WS2 doping within PANI matrix and reached to 117.9%. Furthermore, the rheological measurements have revealed the viscoelastic nature of NFs along with a remarkable reduction in apparent viscosity (up to 8.4%). The temperature sweep viscosity indicated the transition of relative viscosity from high to low at a critical temperature of about 55°C. The NF10 (WS2 + PANI 5, at 0.005 vol%) was found to be the best candidate with 63.8% thermal conductivity enhancement and 6.4% viscosity reduction as compared with the base fluid at an operating temperature of 50°C. Thus, WS2 doping within PANI has proved to be crucial in the proliferation of thermal conductivity and mitigation of viscosity.

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Section: Resultssupporting

confidence: 75%

Section: Stability Of Nfssupporting

confidence: 86%

Thermal conductivity, rheology and stability analysis of 2D tungsten disulphide‐doped polyaniline‐based nanofluids: An experimental investigation

et al. 2020

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“…However, this has been the subject of debate, with objections and recommendations made concerning the validity of the electrokinetic models commonly used to characterize NPs. − For example, the Helmholtz–Smoluchowski equation, derived more than a century ago, is the model most widely used to calculate the ζ-potential of NPs. However, the conditions under which this theory is valid are not easily satisfied for NP dispersions, so the correct magnitudes of the ζ-potential values are rarely found . This model assumes that μ e is independent of the particle radius.…”

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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“…Another subgroup of methods is based on forces of particle interaction (figure 1). These include electrostatic and intermolecular interaction forces (Van der Waals forces) [120,121,122,80,123,124]. The capillary particle interaction also needs to be mentioned [125,126,127,128,80,129].…”

Section: Hybrid Methodsmentioning

confidence: 99%

Applying Droplets and Films in Evaporative Lithography

Kolegov,

Barash

2020

Preprint

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The review covers experimental results of evaporative lithography and analyzes existing mathematical models of this method. Evaporating droplets and films are applied in different fields, such as cooling of heated surfaces of electronic devices, diagnostics in health care, creation of transparent conductive coatings on flexible substrates, surface patterning. A method called evaporative lithography emerged after establishing the connection between the coffee ring effect taking place in drying colloidal droplets, and naturally occuring inhomogeneous vapor flow densities from fluid-vapor interfaces. Essential control of the colloidal particle deposit patterns is achieved in this method by producing ambient conditions that induce a nonuniform evaporation profile from the colloidal liquid surface. Evaporative lithography is part of a wider field, which is known as "Evaporative-induced self-assembly" (EISA). EISA involves methods based on the contact line processes, methods employing particle interaction effects and evaporative lithography. As a rule, evaporative lithography is a flexible and single-stage process with such advantages as simplicity, low price and possibility of application to almost any substrate without pretreatment. Since no mechanical impact on a template is present in evaporative lithography, the template integrity is preserved in the process. The method is also useful for creating materials with localized functions, such as slipperiness and self-healing. For these reasons, evaporative lithography attracts increasing attention and has a number of noticeable achievements at present. We also analyze limitations of the approach and ways of its further development.

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Interactions between nanoparticles in nanosuspension

Cited by 32 publications

References 71 publications

Thermal conductivity, rheology and stability analysis of 2D tungsten disulphide‐doped polyaniline‐based nanofluids: An experimental investigation

Thermal conductivity, rheology and stability analysis of 2D tungsten disulphide‐doped polyaniline‐based nanofluids: An experimental investigation

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

Applying Droplets and Films in Evaporative Lithography

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