A5001569469- Advanced Sensor and Energy Harvesting Materials
- Tactile and Sensory Interactions
- Nanomaterials and Printing Technologies
- Conducting polymers and applications
- Supercapacitor Materials and Fabrication
- Pickering emulsions and particle stabilization
- Thermal Radiation and Cooling Technologies
- Building Energy and Comfort Optimization
- Diamond and Carbon-based Materials Research
- Urban Heat Island Mitigation
- Electrospun Nanofibers in Biomedical Applications
- Fuel Cells and Related Materials
- Laser Material Processing Techniques
- Adhesion, Friction, and Surface Interactions
North Carolina State University
2020-2024
Abstract Conductive textiles are promising for human–machine interfaces and wearable electronics. A simple way to create conductive by coating fabric with liquid metal (LM) particles is reported. The process involves dip‐coating the into a suspension of LM at room temperature. Despite being coated uniformly after drying, remain electrically insulating due native oxide that forms on particles. Yet, they can be rendered compressing textile rupture thereby percolate Thus, patterned mold pattern...
Pastes and "foams" containing liquid metal (LM) as the continuous phase (liquid foams, LMFs) exhibit metallic properties while displaying paste or putty-like rheological behavior. These enable LMFs to be patterned into soft stretchable electrical thermal conductors through processes conducted at room temperature, such printing. The simplest LMFs, featured in this work, are made by stirring LM air, thereby entraining oxide-lined air "pockets" LM. Here, it is reported that mixing small amounts...
This review focuses on surface modifications to gallium‐based liquid metals (LMs), which are stretchable conductors with metallic conductivity and nearly unlimited extensibility due their nature. Despite the enormous tension of LM, it can be patterned into nonspherical shapes, such as wires, presence a native oxide shell. Incorporating inherently soft LM elastomeric devices offers comfort, mechanical compliance, stretchability. The thin layer also enables formation stable colloids...
We report a spray deposition technique for patterning liquid metal alloys to form stretchable conductors, which can then be encapsulated in silicone elastomers via the same spraying procedure. While has been used previously deposit many materials, including metals, this work focuses on quantifying process and combining it with silicones. Spraying generates microparticles (~5 μm diameter) that pass through openings stencil produce traces high resolution (~300 µm using stencils from craft...
This paper demonstrates that air-stable radicals enhance the stability of triboelectric charge on surfaces. While surfaces is often undesirable (e.g., static discharge), improved retention can benefit specific applications such as air filtration. Here, it shown self-assembled monolayers (SAMs) containing radicals, 2,2,6,6-tetramethylpiperidin-1-yl)oxidanyl (TEMPO), hold longer than those without TEMPO. Charging and are monitored by Kelvin Probe Force Microscopy (KPFM) a function time....
Abstract Liquid metal is a compelling material for making soft and stretchable devices due to its high electrical conductivity extreme stretchability. One way pattern liquid nebulize it into small droplets, spray onto surface as film, then use laser “sinter” circuit patterns. Here, shown that including poly(amic acid) in the spray‐deposited film has multiple benefits: (1) allows unsintered regions be removed easily, (2) lowers power required sintering, (3) converts carbon upon exposure...
The fluid nature of liquid metals combined with their ability to form a solid native oxide skin enables them be patterned in ways that would challenging for metals. present work shows unique way patterning by injecting into mold. mold contains nonstick coating the removal mold, thereby leaving just metal on target substrate. This approach offers simplicity and structural control molding but without having become part device. Thus, can encapsulated very soft polymers collapse if used as...
Abstract This paper describes laser exposure to tune the infrared (IR) emissivity of a film eutectic gallium indium (EGaIn) particles. EGaIn – liquid metal at room temperature forms native oxide that keeps particles from spontaneously percolating. Photothermal energy CO 2 percolates into conductive network. Here, it also causes decrease in IR 0.4 0.24 over range 7.5–13 µm wavelength (measured by an camera) with increase fluence 1.4 1.9 J cm −2 . The percolate most prominently bottom film,...
Micromolding silicone elastomers has many uses in microfluidics, soft lithography and microfabrication but usually requires further processing to integrate functional materials like electrodes. Herein, we report a simple method pattern electrodes into micromolded by using laser-induced graphene (LIG) on SU-8, which is popular photoresist. LIG derived from SU-8 generates conductive carbon layer that transfers the cured elastomer when peeled away mold, producing microchannels with embedded We...