Correlations of rheological methods to coatings' performance

Zheng, Shun Xing; Chen, Hua Shan

doi:10.1016/j.porgcoat.2022.107403

Cited by 8 publications

(3 citation statements)

References 77 publications

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“…[32] The rheology influences key characteristics such as leveling, vertical flow, and adhesion, which collectively affect the thin-film coating process. [32,33] Moreover, the shrinkage and pressure on the coating mechanism will vary with respect to the rheology of the solution. [33,34] As a whole, the layer thickness changes, and eventually, that will affect the bandgap of the thin film.…”

Section: Introductionmentioning

confidence: 99%

“…[32,33] Moreover, the shrinkage and pressure on the coating mechanism will vary with respect to the rheology of the solution. [33,34] As a whole, the layer thickness changes, and eventually, that will affect the bandgap of the thin film. [32] Since solution-processed C-PSC is also classified as a thin-film emerging PV, the rheological balancing of the material improves the reproducibility and enhances the translation rate of high-performance lab scale devices to the industrial level.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Validation of Optimized Solar Cell Capacitance Simulation for Rheology‐Modulated Carbon‐Based Hole Transport Layer‐Free Perovskite Solar Cell

Valsalakumar,

Bhandari,

Mallick

et al. 2024

Adv Energy and Sustain Res

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The hole transport layer (HTL)‐free carbon‐based perovskite solar cell (C‐PSC) has attracted the attention of researchers due to its ease of fabrication and reduced costs in the manufacturing process. The rheological and physical characteristics of the solutions influence the layer quality of different device fabrication methods. Herein, the HTL‐free structure of C‐PSC through solar cell capacitance simulator (SCAPS) simulations is analyzed and validated with experimental results using rheology‐varied mesoporous‐TiO2 (m‐TiO2) paste. Regarding the m‐TiO2 rheology, two different samples (Type 1 and Type 2) are used, and six different configurations by thickness variation are analyzed utilizing SCAPS simulations. For Type 1 and Type 2, the best configurations exhibit theoretical efficiencies of 16.40% and 16.81%, respectively, without the influence of the resistance factor. After replicating similar designs in experiments, the efficiencies become 10.12% and 12.20%, respectively. Further, results are investigated by SCAPS simulations incorporating series and shunt resistance values, resulting in efficiencies of 10.56% and 12.59% for Type 1 and Type 2, respectively, which is comparable with actual devices. Finally, the variation of theoretical and experimental results is scrutinized with the help of impedance spectroscopy and external quantum efficiency, demonstrating the significance of this work for commercialization aspects.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental Validation of Optimized Solar Cell Capacitance Simulation for Rheology‐Modulated Carbon‐Based Hole Transport Layer‐Free Perovskite Solar Cell

Valsalakumar,

Bhandari,

Mallick

et al. 2024

Adv Energy and Sustain Res

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“…On the one hand, their interactions with water molecules grant a large hydration shell, hindering the translational movement of the molecules with respect to the nanofibers. This partial trapping of water, along with a high aspect ratio, is translated into a higher viscosity and yield stress [ 2 , 3 ]. On the other hand, according to the DLVO theory, the electrostatic repulsion between the nanofibers that are adsorbed to the dispersed phase of an oil-in-water emulsion provides a potential energy barrier that prevents coalescence of oil droplets [ 4 , 5 ].…”

Section: Introductionmentioning

confidence: 99%

Stabilization of Beeswax-In-Water Dispersions Using Anionic Cellulose Nanofibers and Their Application in Paper Coating

Bayés,

Aguado,

Tarrés

et al. 2023

Nanomaterials

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Beeswax is a bio-sourced, renewable, and even edible material that stands as a convincing option to provide paper-based food packaging with moisture resistance. Nonetheless, the difficulty of dispersing it in water limits its applicability. This work uses oxidized, negatively charged cellulose nanofibers along with glycerol to stabilize beeswax-in-water emulsions above the melting point of the wax. The synergistic effects of nanocellulose and glycerol granted the stability of the dispersion even when it cooled down, but only if the concentration of nanofibers was high enough. This required concentration (0.6–0.9 wt%) depended on the degree of oxidation of the cellulose nanofibers. Rheological hindrance was essential to prevent the buoyancy of beeswax particles, while the presence of glycerol prevented excessive aggregation. The mixtures had yield stress and showed pseudoplastic behavior at a high enough shear rate, with their apparent viscosity being positively influenced by the surface charge density of the nanofibers. When applied to packaging paper, the nanocellulose-stabilized beeswax suspensions not only enhanced its barrier properties towards liquid water (reaching a contact angle of 96°) and water vapor (<100 g m−2 d−1), but also to grease (Kit rating: 5) and airflow (>1400 Gurley s). While falling short of polyethylene-coated paper, this overall improvement, attained using only one layer of a biobased coating suspension, should be understood as a step towards replacing synthetic waxes and plastic laminates.

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Effect of Solid Content on Rheological, Mechanical, and Thermal Properties of Adipic Acid‐Based Flame Retardant Polyurethane Dispersion

Mishra,

Kapatel,

Kim

2024

J of Applied Polymer Sci

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The solid concentration of polyurethane dispersion is an important aspect of the coating application. In the present work, anionic waterborne polyurethane was prepared by reacting PPG‐100, adipic acid, and THPP‐based monophosphate polyester diol with IPDI. The formulation was done by varying solid concentrations of dispersion. The chemical structure was confirmed using FTIR and NMR. The surface morphology of coated panels was analyzed by SEM that shows as solid concentration increases surface roughness increases. The rheological property indicates that the solid concentration of FRPUDs increases viscosity and storage modulus whereas loss modulus decreases. The thermal degradation rate increases from 348°C to 354°C with increased solid concentration. LOI increases from 26% to 29% with increase in solid concentration. Tensile strength increases from 10.5 to 14.8 MPa with an increase in solid concentration in dispersion. Flexibility or elongation increases from 268% to 299% with a decrease in solid concentration. Scratch hardness in coating increases with increase in solid concentration.

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Correlations of rheological methods to coatings' performance

Cited by 8 publications

References 77 publications

Experimental Validation of Optimized Solar Cell Capacitance Simulation for Rheology‐Modulated Carbon‐Based Hole Transport Layer‐Free Perovskite Solar Cell

Experimental Validation of Optimized Solar Cell Capacitance Simulation for Rheology‐Modulated Carbon‐Based Hole Transport Layer‐Free Perovskite Solar Cell

Stabilization of Beeswax-In-Water Dispersions Using Anionic Cellulose Nanofibers and Their Application in Paper Coating

Effect of Solid Content on Rheological, Mechanical, and Thermal Properties of Adipic Acid‐Based Flame Retardant Polyurethane Dispersion

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