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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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PbI 2 Reagent Impurities Catalyze Mixed-Cation Halide Perovskite Ink Degradation
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Structure and Flow-Viscosity of Filled-Polymer-Based 3D Printing Ink: Exploration through Coarse-Grained Molecular Dynamics
The addition of nanofiller particles to a polymer matrix has long been known to enhance or modify the composite’s mechanical and rheological properties. However, quantitatively capturing such changes with molecular level simulations remains computationally challenging. Toward that goal, we performed coarse-grained molecular dynamics of a nanocomposite system at a fixed (25 vol %) filler loading under nonspecific, weak polymer–filler interactions representative of a broad class of technologically important materials. We report several interesting results, including: (1) the equilibrium chain-configuration remains Gaussian-like as in an unfilled melt; (2) smaller filler particles display a stronger tendency to cluster; (3) larger fillers act as plasticizers by reducing the entanglement density and accelerating the chain mobility; and (4) fillers enhance the tensile response modulus, with the effect being stronger for larger particles. We also simulate cluster breakup, yielding, and elongational flow under an applied time-linear tensile strain and study the flow viscosity as a function of filler-size and chain-length.
In-situ resonant band engineering of solution-processed semiconductors generates high performance n-type thermoelectric nano-inks
Thermoelectric devices possess enormous potential to reshape the global energy landscape by converting waste heat into electricity, yet their commercial implementation has been limited by their high cost to output power ratio. No single “champion” thermoelectric material exists due to a broad range of material-dependent thermal and electrical property optimization challenges. While the advent of nanostructuring provided a general design paradigm for reducing material thermal conductivities, there exists no analogous strategy for homogeneous, precise doping of materials. Here, we demonstrate a nanoscale interface-engineering approach that harnesses the large chemically accessible surface areas of nanomaterials to yield massive, finely-controlled, and stable changes in the Seebeck coefficient, switching a poor nonconventional p- type thermoelectric material, tellurium, into a robust n -type material exhibiting stable properties over months of testing. These remodeled, n -type nanowires display extremely high power factors (~500 µW m -1 K -2 ) that are orders of magnitude higher than their bulk p -type counterparts.
Porous cage-derived nanomaterial inks for direct and internal three-dimensional printing
The convergence of 3D printing techniques and nanomaterials is generating a compelling opportunity space to create advanced materials with multiscale structural control and hierarchical functionalities. While most nanoparticles consist of a dense material, less attention has been payed to 3D printing of nanoparticles with intrinsic porosity. Here, we combine ultrasmall (about 10 nm) silica nanocages with digital light processing technique for the direct 3D printing of hierarchically porous parts with arbitrary shapes, as well as tunable internal structures and high surface area. Thanks to the versatile and orthogonal cage surface modifications, we show how this approach can be applied for the implementation and positioning of functionalities throughout 3D printed objects. Furthermore, taking advantage of the internal porosity of the printed parts, an internal printing approach is proposed for the localized deposition of a guest material within a host matrix, enabling complex 3D material designs.
Sprayable copper and copper–zinc nanowires inks for antiviral surface coating
SEM and TEM images of copper and copper–zinc nanowires that are sprayable for antiviral surface coating.
Low-Power Characterization and Integration of Carbon Black Resistive Ink for Aerosol Jet-Printed RF Components
Aerosol jet printing (AJP) is gaining attention in additive manufacturing research, especially in the discipline of microwave engineering. Currently, no reliable AJP method exists to fabricate resistors that are both electrically small and with a resistance compatible with waveguide impedances for use in microwave components. In this work, the commercially available Metalon JR-038 is characterized and used to fabricate a resistor that is 100 μ m long by 250 μ m wide for the first time to the best of our knowledge. Furthermore, this resistor was then used to fabricate a Ka-band Wilkinson power divider using only the AJP process.
Adhesion Testing of Direct-Write Printed Ink on Metallic Structural Components
The successful adoption of additive manufacturing for the rapid prototyping of direct-write printed electronics requires the establishment of quantifiable metrics that can interrogate device performance. One measure of performance is the adhesion strength between the substrate and printed film interface, which is critical since the strength of this interface can dictate the accuracy and reliability of the printed device. In this work, a non-contact laser-induced spallation technique was used to quantify the adhesion of silver printed films on aluminum alloy substrates. The laser-based method was compared to a standardized pull-off adhesion test, which provided baseline measurements of adhesion strength. The sintering conditions were shown to play an important role in the film-substrate adhesion strength, as well as the cohesion and ductility of the film itself. The methods and results described in this work support the establishment of process control steps that are necessary for quickly verifying the reliability of printed devices prior to their deployment in critical experiments.
The Impact of Ink and Spray Variables on Catalyst Layer Properties, Electrolyzer Performance, and Electrolyzer Durability
Not Available
Direct-Ink-Writing of Flexible Sensor Array for Large Area Pressure Mapping
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Development of Roll-to-Roll Simultaneous Multilayer Deposition Methods for Solid-state Electrochemical Devices using Highly Particulate Loaded Aqueous Inks
A platform for simultaneous multilayer roll-to-roll coating was developed for solid-state electrochemical devices through Saint-Gobain’s Solid Oxide Fuel Cell. Six wet layers were successfully coated one top of another using multilayer slide coating following design rules developed through a step-wise approach. Solid oxide fuel cells, which comprise of engineered ceramic films, were made with dual slot and multi-layer slide dies and shown to have similar performance to cells made with incumbent coating methods. Additionally, interlayers were coated below their individual singular low flow limits using simultaneous multilayer coating.
Direct-Ink Write Additive Manufacturing of Dicyclopentadiene Resins_Leguizamon_2021 JOWOG.
Abstract not provided.
Methods of 3D Printing Bi2Te3-Ink-Based Thermoelectric Modules.
Abstract not provided.
Simulation of the direct ink write process using finite elements and cThruAMR.
Abstract not provided.
Assessing Aerosol Jet Printed Gold Inks for Printed Electronics Applications.
Abstract not provided.
Real-Time Process Modeling & Control of Direct Ink Write 3D Printing using Computer Vision and Machine Learning.
Abstract not provided.
Rheological Behavior & Process Monitoring of Highly Filled Direct-Ink Write Pastes.
Abstract not provided.