A5035574794- Advanced Sensor and Energy Harvesting Materials
- Gold and Silver Nanoparticles Synthesis and Applications
- ZnO doping and properties
- Tactile and Sensory Interactions
- Quantum Dots Synthesis And Properties
- Molecular Junctions and Nanostructures
- nanoparticles nucleation surface interactions
- Conducting polymers and applications
- Surface Chemistry and Catalysis
- Phase Change Materials Research
- Advanced Materials and Mechanics
- Polymer Surface Interaction Studies
- Nanocluster Synthesis and Applications
- Nanomaterials for catalytic reactions
- Surface Modification and Superhydrophobicity
- Nanowire Synthesis and Applications
- Soft Robotics and Applications
- Dielectric materials and actuators
- Thermal Radiation and Cooling Technologies
- Nanomaterials and Printing Technologies
- Photonic Crystals and Applications
- Ion-surface interactions and analysis
- Gas Sensing Nanomaterials and Sensors
- Thermal properties of materials
- Electronic and Structural Properties of Oxides
United States Air Force Research Laboratory
2017-2023
UES (United States)
2017-2023
Cornerstone Research Group (United States)
2023
Wright-Patterson Air Force Base
2020
University of Virginia
2012-2018
Room-temperature liquid metals, such as nontoxic gallium alloys, show enormous promise to revolutionize stretchable electronics for next-generation soft robotic, e-skin, and wearable technologies. Core-shell particles of metal with surface-bound acrylate ligands are synthesized polymerized together create cross-linked particle networks comprising >99.9% by weight. When stretched, within these (Poly-LMNs) rupture release their payload, resulting in a rapid 108 -fold increase the network's...
Eutectic gallium–indium alloy (EGaIn, a room-temperature liquid metal) nanoparticles are of interest for their unique potential uses in self-healing and flexible electronic devices. One reason is due to passivating oxide skin that develops spontaneously on exposure ambient atmosphere which resists deformation rupture the resultant particles. It then develop methods control this growth process. hypothesized here functionalization EGaIn with thiolated molecules could moderate based insights...
Gallium alloys with other low melting point metals, such as indium or tin, to form room-temperature liquid eutectic systems. The gallium in the rapidly forms a thin surface oxide when exposed ambient oxygen. This has been previously exploited for self-stabilization of metal nanoparticles, retention metastable shapes, and imparting stimuli-responsive behavior alloy surface. In this work, we study effect water an oxidant its role defining chemistry. We identify several pathways that can lead...
Room-temperature liquid metal alloys encompass a highly versatile family of materials possessing unique set chemical, electronic, biological, and mechanical properties. The surface oxide metals has direct influence on these properties is often composed one the major alloy components (i.e., gallium or indium). However, this not foregone conclusion, as identity can be altered by addition minority elements into metal. Through judicious choice alloying metal, composition therefore resulting...
Eutectic gallium–indium is a room temperature liquid metal that can be readily fabricated into nanoparticles. These particles form thin, passivating oxide shell chemically modified to change the mechanical properties of particle.
Room-temperature liquid-metal particles are a burgeoning material platform for stimuli-responsive electronics, self-healing circuitry, stretchable/flexible conductors, drug delivery, and wearable devices. The ability to chemically tune the nanoscale surface oxide of is critical these applications. To this end, method silanizing liquid gallium alloy has been developed. benefits alkoxysilane ligands demonstrated by orthogonal functionalizations produce diverse, multifunctional hybrid...
Abstract Next generation textile‐based wearable sensing systems will require flexibility and strength to maintain capabilities over a wide range of deformations. However, current material sets used for skin contacting electrodes lack these key properties, which hinder applications such as electrophysiological sensing. In this work, facile spray coating approach integrate liquid metal nanoparticle into textile form factors conformal, flexible, robust is presented. The system employs...
Inorganic Ga–In alloy nanoparticles suspended in a traditional thermal transport fluid simultaneously increase the overall diffusivity of and serve as cyclable solid–liquid PCM slurry, providing sink definable over wide temperature range.
Eutectic gallium–indium nanoparticles (EGaIn NPs) were produced and subsequently functionalized with decylphosphonic acid under various conditions the goal of producing highly stable room-temperature liquid metal colloids. Fourier transform infrared spectroscopy was used to determine phosphonic (PA) bonding modes (e.g., bidentate, tridentate) as a function treatment conditions. The strongest (i.e., predominantly found take place elevated temperature (reflux in hexanes), whereas lower bulk...
Classical nucleation theory and Derjaguin, Landau, Verwey, Overbeek (DLVO) for colloidal stability were applied to gain insight into the synthesis of dodecanethiol (DDT) functionalized silver nanoparticles (NPs) by reduction nitrate with sodium borohydride in ethanol. This analysis indicated importance quickly establishing a dense DDT ligand brush on inherently unstable primary particles achieve stability. The DLVO calculations also that electrostatic potential was minor contributor...
Abstract MALDI mass‐spectrometry measurements are combined with self‐consistent mean‐field (SCF) calculations to detect and predict ligand phase separation on Ag nanoparticles. The experimental theoretical techniques complement each other by enabling quantification of the nearest‐neighbor distribution a mixture in monolayer shell. By tracking characteristic metallic fragment family, analysis spectrum produces frequency corresponding specific patterning. Inherent SCF calculation is...
Silver nanoparticles with mixed ligand self-assembled monolayers were synthesized from dodecanethiol and another a homologous series of alkanethiols (butanethiol, pentanethiol, heptanethiol, octanethiol, nonanethiol, decanethiol, undecanethiol, or dodecanethiol[D25]). These hypothesized to exhibit phase separation that increases degree physical mismatch between the ligands based on difference in number carbons two ligands. Dodecanethiol/dodecanethiol[D25] was expected minimal as have only...
Phase-changing materials have recently found use as particulate fillers to engender stiffness-changing behavior in composites. In the transition from solid liquid particles, composite modulus can be significantly reduced, and then raised again particles are allowed solidify. While general effect of stiffness tuning phase-changing composites has been demonstrated a range studies applications, most drastic ranges provided by fusible metallic alloys, which commonly subject formation oxide...
Electronic skins (e-skins) are widely used in wearables, robotics, and medical field. In this paper we introduce a fabrication characterization of bio-inspired robot electronic skin, with multiparameter sensing capabilities that include detection changes temperature, locomotion sensi-worm robot. Soft robotics has gained much attention recent years due to its stretchability conformability reaching confined areas uneven surfaces. robots enabled by advances flexible hybrid electronics (FHE)...
Detection of monolayer morphology on nanoparticles smaller than 10 nm has proven difficult with traditional visualization techniques. Here matrix-assisted laser desorption ionization mass spectrometry (MALDI-MS) is used in conjunction atomistic simulations to detect the formation Janus-like monolayers noble metal nanoparticles. Silver were synthesized a consisting dodecanethiol (DDT) and mercaptoethanol (ME) at varying ratios. The then analyzed using MALDI-MS, which gives information local...
Abstract Room‐temperature liquid metal particles based on gallium have become significantly important for developing next‐generation soft electronics. Eutectic gallium‐indium (EGaIn) alloys can be fabricated into core‐shell discretely encapsulated by a passivating oxide. Application of mechanical stimuli results in rupturing the molten core through oxide shell, merging EGaIn to form conductive pathways. Generally, properties are largely defined native which imparts viscoelastic fluid. In...
Abstract MALDI mass‐spectrometry measurements are combined with self‐consistent mean‐field (SCF) calculations to detect and predict ligand phase separation on Ag nanoparticles. The experimental theoretical techniques complement each other by enabling quantification of the nearest‐neighbor distribution a mixture in monolayer shell. By tracking characteristic metallic fragment family, analysis spectrum produces frequency corresponding specific patterning. Inherent SCF calculation is...
Stretchable conductors traditionally face trade-offs between conductivity, durability, and performance at high strains. In article number 1903864, Christopher E. Tabor co-workers generate crosslinked networks of liquid-metal particles encased in oxide shells. The resulting transform with applied strain as rupture release liquid metal, generating a highly stretchable conductive architecture that autonomously increases conductivity response to up 700%.