A linear regime of hysteresis for calculating the dynamic contact angle under low capillary numbers with displacement experiments in microscale PDMS microchannels

Wen, Menggang; Lei, Da; Li, Yun; Feng, Jingya; Wang, Lei

doi:10.1016/j.jcis.2019.10.038

Cited by 4 publications

(2 citation statements)

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“…However, observing air bubble emergence at the core outlet may delay and enlarge the breakthrough pressure measurement. Visual observation has been widely used in microflow in PPNs. − Therefore, the gas breakthrough pressures were measured step-by-step in PPNs via microvisualization technology in this work. The pressure holding time was regulated by observing whether the gas–liquid interface moves.…”

Section: Methodsmentioning

confidence: 99%

Asymptotic Model of Breakthrough Pressure in Partially Saturated Porous Media with Microvisualization Step-by-Step Breakthrough Experiments

et al. 2020

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Mastering the breakthrough process and predicting the breakthrough pressure in partially saturated porous media (PSPM) are crucial for evaluating the sealing ability of reservoir caprock to hydrocarbon, CO 2 , radiation, etc. An accurate model for predicting the breakthrough pressure in PSPM has not been put forward since the characteristic of the breakthrough point in PSPM is still mystified. In this paper, a microvisualization experimental system was set to capture gas−liquid displacement images in partially saturated glass planar pore networks (glass-PPNs) in real time. Breakthrough pressures and capillary pressures were measured by a step-by-step method. The measured capillary pressure curves (CPCs) were consistent with the van Genuchten model. The experimental results manifested that the inflection point of the CPC in PSPM characterizes the breakthrough point. Moreover, the effect of initial wetting phase saturation (IWPS) on breakthrough pressure was analyzed. The breakthrough pressure increases with the increasing IWPS at first. After achieving a specific level, IWPS exerts a weak influence on the breakthrough pressure, which is finally asymptotical to a maximum value. An asymptotic model was proposed to describe the law of breakthrough pressure with IWPS. Compared with the exponential model, the asymptotic model shows to be better consistent with other breakthrough pressure experiment results in partially saturated three-dimensional (3D) cores. Moreover, the theoretical expression of the asymptotic model when IWPS = 1 was derived based on the above inflection point theory and the porous media capillary bundle hypothesis.

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Section: Methodsmentioning

confidence: 99%

Asymptotic Model of Breakthrough Pressure in Partially Saturated Porous Media with Microvisualization Step-by-Step Breakthrough Experiments

et al. 2020

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“…Smaller particle sizes lead to an increased surface area, facilitating better wetting and spreading of the spray solution on target crops or surfaces. This enhanced wetting and spreading promote improved contact between the pesticide and the target organisms, thereby enhancing the effectiveness of the pesticide [27].…”

Section: Combining the Theoretical Transport Processes And Actual Eff...mentioning

confidence: 99%

Particle Size Effect of Cyetpyrafen Formulation in the Pesticide Transmission Process and Its Impact on Biological Activity

Yu,

Liu,

et al. 2023

Molecules

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Cyetpyrafen is a compound that lacks inherent uptake and systemic translocation activity. If mites do not come into direct contact with the pesticide solution on leaves, the efficacy cannot be achieved. Controlling the particle size can potentially play a crucial role in the manifestation of efficacy. In this study, high-throughput formulation technology was used to systematically screen a large number of adjuvants to obtain cyetpyrafen formulations. The particle size of the active ingredient in the formulation was measured. By examining the dynamic light scattering and contact angle, we simulated the actual process of the efficacy transmission of cyetpyrafen formulations against Tetranychus cinnabarinus. Our results showed that the activity of cyetpyrafen increases as the particle size decreases, suggesting that reducing the particle size can enhance the coverage and deposition on crop leaves, and further improve the dispersion efficiency and enhance spreading capabilities. Furthermore, controlling the particle size at 160 nm resulted in an LC50 value of 0.2026, which is approximately double than that of the commercial product. As a novel pesticide for mites, our study presents the most effective cyetpyrafen formulation in practice. Our findings provide valuable insights into controlling other mite species that pose a threat to agricultural products.

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A metal-free radical technique for cross-linking of polymethylhydrosiloxane or polymethylvinylsiloxane using AIBN

2020

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A linear regime of hysteresis for calculating the dynamic contact angle under low capillary numbers with displacement experiments in microscale PDMS microchannels

Cited by 4 publications

References 50 publications

Asymptotic Model of Breakthrough Pressure in Partially Saturated Porous Media with Microvisualization Step-by-Step Breakthrough Experiments

Asymptotic Model of Breakthrough Pressure in Partially Saturated Porous Media with Microvisualization Step-by-Step Breakthrough Experiments

Particle Size Effect of Cyetpyrafen Formulation in the Pesticide Transmission Process and Its Impact on Biological Activity

A metal-free radical technique for cross-linking of polymethylhydrosiloxane or polymethylvinylsiloxane using AIBN

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