Abstract Aramid nanofibers (ANFs) are a strong and heat‐resistant nanomaterial that can be isolated from commercial para‐aramid fibers, which allow bottom‐up self‐assembly to form ordered macroscale structures like ANF films. However, the anisotropic nature of high aspect ratio ANFs is not fully exploited when fabricating films for optimal mechanical properties. In this research, direct ink writing (DIW) applied produce ANF‐assembled with arbitrary shapes, shear‐induced alignment follow...

A furan-maleimide based 3D printing ink for the fabrication of a self-healing and high strength thermoset with recycling potential.

Poly(vinylidene fluoride) (PVDF) possesses outstanding piezoelectric properties, which allows it to be utilized as a functional material. Being semicrystalline polymer, enhancing the properties of PVDF through promotion polar β phase is key research focus. In this research, precipitation printing demonstrated scalable and tailorable approach additively manufacture complex bulk 3D energy harvesters with high-β PVDF. The β-phase fraction improved 60% printing, yielding more than 200%...

Stretchable piezoelectric stress/strain sensing materials have attracted substantial research interest in the fields of wearable health monitoring, motion capturing, and soft robotics. These sensors require operation under dynamic loading conditions with high strain range, changing strain/loading rates, varying pre-stretch states, which are challenging for existing to produce reliable measurements. To overcome these challenges, an intrinsically stretchable poly(vinylidene fluoride) (PVDF)...

Current additive manufacturing processes for polymers, including material extrusion, vat photopolymerization, jetting, and powder bed fusion, have limitations in high-temperature thermoplastics narrow selection, compromised mechanical properties, potential degradation of materials during processing. Polysulfone (PSU) is a thermoplastic with outstanding chemical resistance, flame retardancy, toughness. However, besides injection molding, PSU has only been achieved through extrusion or...

Birds are outstanding flyers with high aerodynamic efficiency and agility, especially under dynamic flight conditions. Flight feathers play a key role in achieving these remarkable performances based on their flexible hierarchical structures. To develop bio-inspired micro air vehicles (MAVs), researchers have adopted rigid feather-shaped panels, membrane-type artificial natural as part of the morphing wing platform. In this paper, bio-inspired, 3D printed structures resembling presented....

Bird flight is often characterized by outstanding aerodynamic efficiency, agility and adaptivity in dynamic conditions. Feathers play an integral role facilitating these aspects of performance, the benefits feathers provide largely derive from their intricate hierarchical structures. Although research has been attempted on developing membrane-type artificial for bio-inspired aircraft micro air vehicles (MAVs), fabricating anatomically accurate to fully exploit advantages not achieved. Here,...

View Video Presentation: https://doi.org/10.2514/6.2022-0077.vid Vinyl ester (VE) is a widely used thermosetting polymer as structural materials because of its high mechanical properties and excellent chemical resistance. In this work, modified setup direct ink writing (DIW) with ultraviolet (UV)-thermal dual curing developed to fabricate nanocomposites consist commercially available VE resins 4 wt% fumed silica (FS) performance. The printing extruded within dark zone that allows for liquid...

Additive manufacturing of poly(vinylidene fluoride) (PVDF) as a piezoelectric material gained wide research interests over the past decade. Promoting most polar β phase PVDF during or after printing process is key focus to enhance its piezoelectricity. In this paper, novel additive technique termed precipitation developed produce high-β with advantages achieving geometry complexity and fabrication scalability, which based on different solubility in two mutually miscible solvents. Through...

Flexible and stretchable stress strain sensing materials have gained a lot of research interest recently as the development wearable sensors for health monitoring, motion capturing soft robotics. In these applications where dynamic are common, piezoelectricity becomes suitable mechanism due to its fast response high sensitivity. Existing on flexible piezoelectric includes nanocomposites sandwich composites made fillers elastomers. However, giant modulus mismatch between two distinct phases...

The aramid nanofibers (ANFs) are isolated from commercial para-aramid fiber, a class of strong and heat-resistant synthetic fibers. They comprise dense inter-molecular hydrogen bonds among highly aligned molecular chains, resulting in outstanding modulus strength-to-weight properties comparable to carbon fiber cellulose nanofiber. show high aspect ratio with nano-sized diameter micro-scaled length. These have been spotlighted as promising nano-building blocks their excellent mechanical...