A5052844367- Advanced Sensor and Energy Harvesting Materials
- Tactile and Sensory Interactions
- Adhesion, Friction, and Surface Interactions
- Nanomaterials and Printing Technologies
- Gear and Bearing Dynamics Analysis
- Advanced Materials and Mechanics
- Analytical Chemistry and Sensors
- Mechanical stress and fatigue analysis
- Surface Modification and Superhydrophobicity
- Tribology and Lubrication Engineering
- Gas Sensing Nanomaterials and Sensors
- Gold and Silver Nanoparticles Synthesis and Applications
- Fluid Dynamics and Turbulent Flows
- Biosensors and Analytical Detection
- thermodynamics and calorimetric analyses
- Smart Materials for Construction
- Pickering emulsions and particle stabilization
- Lubricants and Their Additives
- Icing and De-icing Technologies
- Polydiacetylene-based materials and applications
- Spectroscopy and Quantum Chemical Studies
- Railway Engineering and Dynamics
- nanoparticles nucleation surface interactions
- Thermoregulation and physiological responses
- Soft Robotics and Applications
Northwestern University
1987-2025
Yale University
2018-2023
Purdue University West Lafayette
2018-2021
Arizona State University
2014-2016
Tempe Union High School District
2015
Boston Biomedical Research Institute
1995
Gallium-based liquid metals are of interest for a variety applications including flexible electronics, soft robotics, and biomedical devices. Still, nano- to microscale device fabrication with these materials is challenging because, despite having surface tension 10 times higher than water, they strongly adhere majority substrates. This unusually high adhesion attributed the formation thin oxide shell; however, its role in process has not yet been established. In this work, we demonstrate...
Soft, flexible, and stretchable electronics are needed to transmit power information, track dynamic poses in next-generation wearables, soft robots, biocompatible devices. Liquid metal has emerged as a promising material for these applications due its high conductivity liquid phase state at room temperature; however, surface oxidation of gives it unique behaviors that often incompatible with scalable manufacturing techniques. This paper reports rapid approach fabricate flexible composed...
The detrimental impacts of icing on transportation and power industries are well‐known. Inspired by natural systems that secrete a functional liquid in response to stimuli, this work introduces an anti‐icing coating responds surface releasing antifreeze liquid. It consists outer porous superhydrophobic epidermis wick‐like underlying dermis is infused with functionality the new validated through condensation frosting, simulated freezing fog, rain experiments. In tested conditions, introduced...
The oxide rupture-induced mechanisms that enable electrical conductivity of liquid metal nanoparticles using thermal and laser sintering.
Nutrients play critical roles in maintaining core physiological functions and preventing diseases. Technologies for delivering these nutrients monitoring their concentrations can help to ensure proper nutritional balance. Eccrine sweat is a potentially attractive class of biofluid purposes due the ability capture easily noninvasively from nearly any region body using skin-integrated microfluidic technologies. Here, miniaturized system this type presented that allows simple, rapid...
Soft electronic systems require stretchable, printable conductors for applications in soft robotics, wearable technologies, and human–machine interfaces. Gallium-based room-temperature liquid metals (LMs) have emerged as promising candidates, recent metal-embedded elastomers (LMEEs) demonstrated favorable properties such stable conductivity during strain, cyclic durability, patternability. Here, we present an ethanol/polydimethylsiloxane/liquid metal (EtOH/PDMS/LM) double emulsion ink that...
Abstract Dehydration has many deleterious effects on cognitive and physical performance as well physiological function, in the context of sports, industrial work, clinical rehabilitation, military applications. Because sweat loss electrolyte vary across individuals, conventional testing strategies using absorbent patch techniques are employed laboratory settings to characterize biomarkers; however, these not suitable for remote environments. Here, an updated wearable microfluidic system...
Abstract Advanced capabilities in noninvasive, situ monitoring of parameters related to sweat serve as the basis for obtaining real‐time insights into human physiological state, health, and performance. Although recently reported classes soft, skin‐interfaced microfluidic systems support powerful functions this context, most are designed single‐use disposables. As a result, associated waste streams have potential create adverse environmental impacts. Here, we introduce materials fabrication...
Amino acids are essential for protein synthesis and metabolic processes in support of homeostatic balance healthy body functions. This study quantitatively investigates eccrine sweat as a significant channel for...
The stress field within machine components is an important indicator for contact failures. Since both thermal stresses due to frictional heating and plasticity are significant in engineering application, it critical predict the total field. In this work, steady- state effect considered a thermo-elastic-plastic model developed. applicable rolling and/or sliding problem, as far small equivalent plastic strain hypothesis respected. Influence coefficients surface normal displacement,...
Liquid metals are promising conductive materials for creating flexible and stretchable electronic devices. However, methods to pattern liquid metal remain limited in scope: fabrication processes often require substantial manual intervention the resulting devices patterned indelibly into substrate. In this paper, we demonstrate creation of electrical traces components from laser-sintered nanoparticles, a digital approach that creates without permanently patterning materials. As deposited,...
We show that single channel capacitive strain sensor consisting of a high dielectric constant liquid sandwiched in-between two metal electrodes can have 25 times higher capacitance per sensor's base area when compared to current two-channel stain sensors.
Abstract An efficient and comprehensive Macro-Micro-Fatigue approach for analyzing the effect of roughness on fatigue life in mixed elastohydrodynamic lubrication contact is presented. It involves two macro-micro approaches, one analysis other stress evaluation. The approaches make it possible to efficiently model pressure film thickness distribution over entire area contact, at same time allowing a detailed account asperity interaction effects. three-stage process comprises dry rough...
Soft robot deformations are typically estimated using strain sensors to infer change from a nominal shape while taking robot‐specific mechanical model into account. This approach performs poorly during buckling and when material properties with time, is untenable for shape‐changing robots that don't have well‐defined resting (unactuated) shape. Herein, these limitations overcome stretchable sensing (S3) sheets fuse orientation measurements estimate 3D surface contours without making...
Abstract Functional particles that respond to external stimuli are spurring technological evolution across various disciplines. While large-scale production of functional is needed for their use in real-life applications, precise control over particle shapes and directional properties has remained elusive high-throughput processes. We developed a emulsion-based process exploits rapid vitrification thixotropic medium manufacture diverse large quantities. The vitrified renders stationary...
Measurements on Copper phthalocyanine iodide Cu(pc)I indicate that this material is an excellent one dimensional conductor with parallel arrays of localized moments interact strongly the conduction electrons. The result antiferromagnetic indirect interaction between spins mediated by itinerant A comparison made ESR, magnetic susceptibility, and NMR measurements for a number materials architecture: Ni(pc)I, Cu(pc) Cu(pc)I.
Predictive constitutive equations that connect easy-to-measure transport properties (e.g., viscosity and conductivity) with system performance variables power consumption efficiency) are needed to design advanced thermal electrical systems. In this work, we explore the use of fluorescent particle-streak analysis directly measure local velocity field a pressure-driven flow, introducing new Python package (FSVPy) perform analysis. Fluorescent streak velocimetry (FSV) combines high-speed...