Jeffrey Richards

Aqueous-Phase Polyelectrolyte Behavior of Hydroxypropyl Chitosan

Julia B. Chatterjee, Emily Krucker-Velasquez, Hiroaki Sai, Kyle J. Gray et autres

Abstract Hydroxypropyl chitosan (HPCS) is a water-soluble, cationic derivative of chitosan whose combination of hydrophilic substituents and residual charged and hydrophobic groups creates a unique landscape of interactions in aqueous media. Despite growing interest in chitosan-based materials, the fundamental solution behavior of …

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Flow-Induced Anisotropic Electrical Transport and Memory Effects in Concentrated Suspensions of Graphene

Xi Wan, Heather Kurtz, Mark C. Hersam, Jeffrey Richards

High performance electronic devices are often produced by coating slurries (inks) of conductive nanomaterials. After drying, the electrical properties become tightly linked to the film microstructure which can be engineered through the formulation of the inks and details of the processing history. …

Robust Interpretation of Electrochemical Impedance Spectra Using Numerical Complex Analysis

Jithin D. George, Willa Brenneis, Vinod K. Sangwan, Dilara Meli et autres

High Resolution Image Download MS PowerPoint Slide Electrochemical Impedance Spectroscopy (EIS) is a noninvasive technique widely used for understanding charge transfer and charge transport processes in electrochemical systems and devices. Standard approaches for the interpretation of EIS data involve starting with a …

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Efficient Formation of a Carbohydrate-Based Polyelectrolyte Complex Gel with Macroscopic Homogeneity

Yuling Chen, Paolo Z. Ramos, Jeffrey Richards, Kenneth R. Shull

Biobased polyelectrolyte complexes (BioPECs) have attracted considerable attention due to their unique properties and potential applications in various fields. However, the processability of BioPECs often remains a challenge because of the insolubility of the solution components and of the complex itself. In …

What Complex Analysis Can Tell Us about Electrochemical Impedance Spectroscopy

Jithin D. George, Vinod K. Sangwan, Dilara Meli, Willa Brenneis et autres

Electrochemical Impedance Spectroscopy (EIS) is a standard non-invasive technique widely used to understand electronic and ionic transport mechanisms in diverse material systems. There have been several approaches, particularly using machine learning, to classify and categorize the complex-valued data that is produced through …

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Structure and Sulfur: Tuning the Viscoelastic and Surface Properties of Natural Keratin Fibers

Caterina Czibula, Jana B. Schaubeder, Glen J. Smales, Natalie Fisher et autres

Natural keratin fibers, such as wool, possess a complex hierarchical structure that governs their mechanical properties and surface energy. However, the extent to which these characteristics are influenced by combined contributions of structural variations (e.g., fiber diameter, intermediate filament (IF) packing) and …

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Robust interpretation of electrochemical impedance spectra using numerical complex analysis

Jithin D. George, Willa Brenneis, Vinod K. Sangwan, Dilara Meli et autres

Electrochemical Impedance Spectroscopy (EIS) is a noninvasive technique widely used for understanding charge transfer and charge transport processes in electrochemical systems and devices. Standard approaches for the interpretation of EIS data involve starting with a hypothetical circuit model for the physical processes …

Anisotropic Electrical Transport in Mechanically Responsive Silver‐Coated Microparticle‐Gel Composites for Flowable Semiconducting Materials

Matthew Brucks, Alina Arslanova, Nicholas F. Byrne, Janan Hui et autres

Soft materials with reversible electrical and mechanical properties are critical for the development of advanced bioelectronics that can distinguish between different rates of applied strain and eliminate performance degradation over many cycles. However, the current paradigm in mechano-electronic devices involves measuring changes …

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Author response for "Invitation to submit to the Soft Matter Emerging Investigator Series: Physical Scaling for Predicting Shear Viscosity and Memory Effects of Lithium-Ion Battery Cathode Slurries"

Qingsong Liu, Jeffrey Richards

Physical scaling for predicting shear viscosity and memory effects of lithium-ion battery cathode slurries

Qingsong Liu, Jeffrey Richards

= 2.18Mn-0.92f, indicating a quantitative prediction of the flow curve of cathode slurries across a wide range of formulation space. We then used electrical conductivity to identify and quantify shear-induced structure memory, evidenced in the ratio of the under-shear conductivity over the …

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Mapping Structure and Rheology of pH-Responsive Resins for Low-VOC Coatings

Khyati K. Patel, Steven E. Bowles, Lindsay E. Matolyak, Douglas R. Vogus et autres

In recent years, the paint and coatings industry has shifted away from traditional resin formulations that require high concentrations of volatile organic compounds (VOCs) to achieve the desired rheological performance and sustainability targets. One approach to eliminate or reduce VOCs in paint …

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Advancing Lithium-Ion Battery Manufacturing Sustainability through Microstructural Analysis of Composite Cathodes

Willa Brenneis, Qingsong Liu, Jeffrey Richards, Jeffrey Lopez

To accelerate electric vehicle (EV) adoption and mitigate transportation emissions, lithium-ion battery (LIB) energy density and rate capability must be improved, advancing EV range and charging speed, respectively. The composite cathode is a major driver of these performance metrics, as its microstructure …