Alexander L. Yarin

An improved phase-field framework for simulating impacts of solidifying metal drops

Ali Mostafavi, Vitaliy Yurkiv, Alexander L. Yarin, Farzad Mashayek

Here, an improved phase-field method for simulating the impact dynamics of solidifying molten metal droplets is developed using targeted free-energy modifications. Conventional Cahn-Hilliard-Navier-Stokes (CHNS) formulations generally do not capture melt retraction over a solidified portion of the droplet, because the newly formed …

Ab Initio Modeling of Ion Interactions in PEDOT:PSS–PEO Polymer Systems and Experimental Observations in Corona Charging

Yi-Fan Zhang, Vitaliy Yurkiv, Farzad Mashayek, Raoul Farer et autres

This study investigates how ions generated during corona discharge, like protonated water clusters H 3 O + (H 2 O) n, O 3 –, NO 3 –, and CO 3 •– (here and hereinafter an unpaired electron is indicated by the dot), …

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Advanced smart nonwovens for food quality monitoring: ultrathin and highly porous polymer fibers via electrically-assisted supersonic solution blow-spinning

Josemar Gonçalves de Oliveira Filho, Jingwei Wu, Jaqueline Rojas Robles, Leonardo Sentanin et autres

Enhancing porosity and reducing fiber diameter significantly improves the sensitivity of nanofibers as colorimetric indicators, making them ideal for food quality monitoring. In this study, ultrathin and highly porous PCL-based nonwoven mats were developed as colorimetric indicators for detecting food spoilage, using …

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Ultra‐High‐Speed Electric‐Field‐Assisted Direct Ink Writing of Poly(3,4‐ethylenedioxythiophene):Polystyrene Sulfonate ‐ Poly(ethylene oxide) Ink on Flexible Substrates

Vitor Bandini, Yong Il Kim, Yayue Pan, Alexander L. Yarin

The electric‐field‐assisted direct ink writing (eDIW) process is a promising manufacturing technique for printing high‐resolution conducting patterns at high‐speed. In this work, the conducting polymer poly(3,4‐ethylenedioxythiophene)‐poly(styrenesulfonate) (PEDOT:PSS) is modified with high‐molecular‐weight (2,000 kDa) nonconducting polyethylene oxide (PEO) additive at 52 wt% solid …

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Model experiments and theory of flame front propagation in forest fire

Alexander L. Yarin, Wenshuo Zhang, Eyal Zussman

To quantify how inter-source spacing (“spatial step”), inclination angle (slope), and wind affect flame-propagation velocity, model experiments were conducted in the present work. Propagation velocities and flame morphologies were quantified and visualized. The measured dependence of velocity on wind speed, slope, and …

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Composite materials with recycled fibers: Evaluation of the effect of different fibers on gypsum composites

Mark Hemphill, Alexander L. Yarin

The use of alternate more sustainable materials in building construction products has been a focus for the last two decades. Defining new methods to utilize materials destined for landfill while not increasing cost and discovering beneficial reuse for such materials is commended …

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Multiscale Modeling and Experimental Insights into High-Temperature Soil Biodegradation Dynamics of Semi-Crystalline Poly(Lactic Acid) Nonwoven Fabrics

Narjess Hajilou, Fatemeh Safari, Muhtar Ahart, Russell J. Hemley et autres

This study investigates the biodegradation of semicrystalline poly(lactic acid) (PLA) nonwovens (NWs) in soil at 58 °C using both experimental and mathematical modeling approaches. The model utilizes a system of parabolic diffusion-reaction partial differential equations (PDEs) to elucidate chemical transformations over time …

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Effect of Compatibilizers on Interfacial Strength in Microdenier Bicomponent Fibers

Yanyue Wang, Piyush Thakre, Behnam Pourdeyhimi, Alexander L. Yarin

Interfacial strength in bicomponent fibers remains a significant challenge jeopardizing durable adhesion and delamination prevention. An integrated experimental-numerical approach is developed here to engineer strengthened interfaces by means of compatibilizers and quantify their effect. Measurements of interfacial adhesion energy indicate that chemically …

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Capillary breakup of liquid jets in the dripping regime and successive drop impacts on a solid surface

Ali Mostafavi, Mohammadmahdi Ranjbar, Vitaliy Yurkiv, Alexander L. Yarin et autres

Purpose The aim of this paper is to present a fully encompassing numerical simulation of a spatially developing capillary jet emanating from a nozzle, followed by sequential pinch-off, free fall and successive drop impacts onto a solid surface, and to quantify energy …

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Attraction and non-attraction of the non-self-similar solutions of the biharmonic equation to the corresponding self-similar solutions

Masao Ogawa, Alexander L. Yarin

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Mechanistic insights into PEO-induced conductivity modulation in PEDOT:PSS/PEO films

Xinnian Wang, Vitor Bandini, Alexander L. Yarin, Yayue Pan

Poly (3,4-ethylenedioxythiophene):poly (styrenesulfonate) (PEDOT:PSS) is one of the most widely used conducting polymers, yet its commercial forms typically exhibit low electrical conductivity, limiting applications in advanced electronics. Here, we systematically investigate the effect of PEO content on the surface morphology and structure …

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Inception of forest fire front: model experiments and theory

Alexander L. Yarin, Wenshuo Zhang, Eyal Zussman