Nicholas Pogharian

Northwestern University

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Eric Rachita

University of Minnesota

Hatsuo Ishida

Case Western Reserve University

Mónica Olvera de la Cruz

Northwestern University

Pablo Froimowicz

University of Buenos Aires

María Laura Salum

Fundación Ciencias Exactas y Naturales

Verônica Calado

Universidade Federal da Paraíba

Isabel Hsieh

Case Western Reserve University

Irlaine Machado

Case Western Reserve University

Alexandre P. dos Santos

Universidade Federal do Rio Grande do Sul

Analisa Pellot

Case Western Reserve University

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Case Western Reserve University

Northwestern University

University of Buenos Aires

Consejo Nacional de Investigaciones Científicas y Técnicas

Fundación Ciencias Exactas y Naturales

Universidad Nacional de Córdoba

Universidade Federal do Rio de Janeiro

Max Planck Institute for Polymer Research

Max Planck Society

Materials Science & Engineering

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Electric Fields Near Undulating Dielectric Membranes

arXiv (Cornell University) (2023)

Nicholas Pogharian Alexandre P. dos Santos Mónica Olvera de la Cruz

Dielectric interfaces are crucial to the behavior of charged membranes, from graphene to synthetic and biological lipid bilayers. Understanding electrolyte behavior near these interfaces remains a challenge, especially in the case of rough dielectric surfaces. A lack of analytical solutions consigns this problem to numerical treatments. We report an analytic method for determining electrostatic potentials near curved dielectric membranes in a two-dimensional periodic 'slab' geometry using a periodic summation of Green's functions. This method is amenable to simulating arbitrary groups of charges near surfaces with two-dimensional deformations. We concentrate on one-dimensional undulations. We show that increasing membrane undulation increases the asymmetry of interfacial charge distributions due to preferential ionic repulsion from troughs. In the limit of thick membranes we recover results mimicking those for electrolytes near a single interface. Our work demonstrates that rough surfaces generate charge patterns in electrolytes of charged molecules or mixed-valence ions.

Electrostatics

Slab

10.48550/arxiv.2311.00570

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Citations (0)

Effects of Normal and Lateral Electric Fields on Membrane Mechanical Properties

The Journal of Physical Chemistry B (2024)

Nicholas Pogharian Petia M. Vlahovska Mónica Olvera de la Cruz

As a core component of biological and synthetic membranes, lipid bilayers are key to compartmentalizing chemical processes. Bilayer morphology and mechanical properties are heavily influenced by electric fields, such as those caused by biological ion concentration gradients. We present atomistic simulations exploring the effects of electric fields applied normally and laterally to lipid bilayers. We find that normal fields decrease membrane tension, while lateral fields increase it. Free energy perturbation calculations indicate the importance of dipole-dipole interactions to these tension changes, especially for lateral fields. We additionally show that membrane area compressibilities can be related to their cohesive energies, allowing us to estimate changes in membrane bending rigidity under applied fields. We find that normal and lateral fields decrease and increase bending rigidity, respectively. These results point to the use of directed electric fields to locally control membrane stiffness, thereby modulating associated cellular processes.

10.1021/acs.jpcb.4c04255

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Citations (2)

Electronic effects of asymmetric and meta-alkoxy substituents on the polymerization behavior of bis-benzoxazines

Polymer Chemistry (2019)

Ya Lyu Eric Rachita Nicholas Pogharian Pablo Froimowicz Hatsuo Ishida

Three isomers of benzoxazine monomers based on m-alkoxyphenol and 4,4′-methylenedianiline were synthesized and successfully isolated by column chromatography.

10.1039/c9py01641d

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Citations (27)

Correction: A truly bio-based benzoxazine derived from three natural reactants obtained under environmentally friendly conditions and its polymer properties

Green Chemistry (2021)

Irlaine Machado Isabel Hsieh Eric Rachita María Laura Salum Daniela Iguchi

Correction for ‘A truly bio-based benzoxazine derived from three natural reactants obtained under environmentally friendly conditions and its polymer properties’ by Irlaine Machado et al. , Green Chem. , 2021, 23 , 4051–4064, DOI: 10.1039/D1GC00951F.

Environmentally Friendly

Natural polymers

10.1039/d1gc90103f

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Citations (2)

A truly bio-based benzoxazine derived from three natural reactants obtained under environmentally friendly conditions and its polymer properties

Green Chemistry (2021)

Irlaine Machado Isabel Hsieh Eric Rachita María Laura Salum Daniela Iguchi

The majority of the published bio-based benzoxazine research has focused almost exclusively on different phenolic and amine compounds, while the aldehyde portion of the oxazine ring remains the same.

Environmentally Friendly

Natural polymers

10.1039/d1gc00951f

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Citations (80)

Electric fields near undulating dielectric membranes

The Journal of Chemical Physics (2024)

Nicholas Pogharian Alexandre P. dos Santos Ali Ehlen Mónica Olvera de la Cruz

Dielectric interfaces are crucial to the behavior of charged membranes, from graphene to synthetic and biological lipid bilayers. Understanding electrolyte behavior near these interfaces remains a challenge, especially in the case of rough dielectric surfaces. A lack of analytical solutions consigns this problem to numerical treatments. We report an analytic method for determining electrostatic potentials near curved dielectric membranes in a two-dimensional periodic “slab” geometry using a periodic summation of Green’s functions. This method is amenable to simulating arbitrary groups of charges near surfaces with two-dimensional deformations. We concentrate on one-dimensional undulations. We show that increasing membrane undulation increases the asymmetry of interfacial charge distributions due to preferential ionic repulsion from troughs. In the limit of thick membranes, we recover results mimicking those for electrolytes near a single interface. Our work demonstrates that rough surfaces generate charge patterns in electrolytes of charged molecules or mixed-valence ions.

10.1063/5.0185570

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Citations (2)