Transfer of rate-thinning and rate-thickening liquids between separating plates and cavities

Wu, Jyun Ting; Carvalho, Márcio S.; Kumar, Satish

doi:10.1016/j.jnnfm.2018.02.010

Cited by 10 publications

(3 citation statements)

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“…23 The affinity behavior between the two causes the contact line of the droplet to move a longer distance. 34 In the nonionic surfactant droplets, the wetting state of droplets with added AEO-4 on cucumber powdery mildew leaves was almost the same as that of Silwet618, while the wetting state of droplets with added AEO-9 was relatively poor. The wetting state of droplets with the other three surfactants in the AEO series was between the states of AEO-4 and AEO-9 (Figure S1).…”

Section: ■ Results and Discussionmentioning

confidence: 91%

“…Due to the special properties of the surfactant molecules in the solution containing Silwet618, they moved more actively on the surface of the lipophilic cucumber powdery mildew, and the affinity between them was relatively strong . The affinity behavior between the two causes the contact line of the droplet to move a longer distance . In the nonionic surfactant droplets, the wetting state of droplets with added AEO-4 on cucumber powdery mildew leaves was almost the same as that of Silwet618, while the wetting state of droplets with added AEO-9 was relatively poor.…”

Section: Resultsmentioning

confidence: 99%

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Regulating Droplet Wetting and Pinning Behaviors on Pathogen-Modified Hydrophobic Surfaces: Strategies and Working Mechanisms

Ding

et al. 2021

J. Agric. Food Chem.

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Hydrophobic surfaces modified by pathogens in agricultural production are one of the main reasons to reduce the utilization of pesticides. Adding surfactants to pesticide solutions is a common method to improve their wetting and spreading properties. In this work, the interaction mechanism between pathogen-modified hydrophobic surfaces and mixtures of surfactants and a pesticide was studied in detail. The interaction mechanism was determined by characterizing the wetting and spreading behaviors of droplets on cucumber powdery mildew leaves at different growth stages. When surfactants were added, droplets on cucumber powdery mildew leaves were in the Wenzel wetting state, the pinning force weakened, the contact line speed accelerated, and the adhesion force increased. We explained the micellar state and aggregation behavior of surfactant molecules in a pesticide solution that was applied to the surface of cucumber powdery mildew leaves. Droplets of solutions containing nonionic surfactants easily formed semibald micelles, binding to the pathogen of powdery mildew, whereas droplets containing cationic surfactants did not do so. Because of the electrostatic interaction between cationic surfactant molecules and powdery mildew pathogens, cationic surfactant molecules did not wet the pathogens very well, so we suggest adding nonionic surfactants rather than cationic surfactants to improve the wetting and spreading of pesticide solutions on cucumber powdery mildew leaves. This study provides new insights into enhancing the wetting and deposition of droplets on pathogen-modified hydrophobic surfaces.

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Section: ■ Results and Discussionmentioning

confidence: 91%

Section: Resultsmentioning

confidence: 99%

Regulating Droplet Wetting and Pinning Behaviors on Pathogen-Modified Hydrophobic Surfaces: Strategies and Working Mechanisms

Ding

et al. 2021

J. Agric. Food Chem.

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“…As a matter of fact, when considering ribbing pattern length scales in printing inks, one cannot neglect the effect of ink rheology, as typical printing inks show significant shear-thinning. This has been studied by Wu, Carvalho & Kumar (2018, 2019).…”

Section: Introductionmentioning

confidence: 99%

Gravure printing with a shear-rate-dependent ink

Rothmann-Brumm,

Brockmann,

Roisman

et al. 2024

Flow

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Gravure printing is a type of printing method that uses metal cylinders with engraved cells that hold ink. The ink is transferred directly to the paper or other material by pressing it against the cylinder. The flow associated with gravure printing includes a flow in a liquid bridge formed in the contact region of the cylinders and a thin-film coating flow of the ink. The flow is governed by viscous and capillary forces. In many cases, the flow is unstable, which leads to the formation of instability patterns on the printed surfaces. The analysis of these instabilities is a very challenging problem, especially since industrial inks are usually rheologically complex. In this experimental and theoretical study, the flow of inks on a rotating cylinder is analysed, accounting for the shear-rate-dependent liquid viscosity. A theoretical solution for the film flow allows us to predict the width of the liquid bridge between two cylinders. Moreover, it is shown that the measured characteristic size of the printed pattern is of the same order as the predicted liquid bridge width. We observe a nearly linear dependence of pattern size and liquid bridge width.

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