scholarly journals Liquid Metal Direct Write and 3D Printing: A Review

2020 ◽  
pp. 2000070
Author(s):  
Taylor V. Neumann ◽  
Michael D. Dickey
Keyword(s):  
3D Printing ◽  
Liquid Metal ◽  
Direct Write

3D printing of spent coffee ground derived biochar reinforced epoxy composites

2021 ◽  
pp. 002199832110022
Author(s):  
Ahmed Alhelal ◽  
Zaheeruddin Mohammed ◽  
Shaik Jeelani ◽  
Vijaya K Rangari
Keyword(s):  
3D Printing ◽  
Flexural Modulus ◽  
Flexural Properties ◽  
Direct Write ◽  
Thermal And Mechanical Properties ◽  
Spent Coffee Grounds ◽  
Coffee Grounds ◽  
Spent Coffee Ground ◽  
Coffee Ground ◽  
3D Printed

Semi-crystalline carbon biochar is derived from spent coffee grounds (SCG) by a controlled pyrolysis process at high temperature/pressure conditions. Obtained biochar is characterized using XRD, SEM, and TEM techniques. Biochar particles are in the micrometer range with nanostructured morphologies. The SCG biochar thus produced is used as reinforcement in epoxy resin to 3 D print samples using the direct-write (DW) method with 1 and 3 wt. % loadings. Rheology results show that the addition of biochar makes resin viscous, enabling it to be stable soon after print; however, it could also lead to clogging of resin in printer head. The printed samples are characterized for chemical, thermal and mechanical properties using FTIR, TGA, DMA and flexure tests. Storage modulus improved with 1 wt. % biochar addition up to 27.5% and flexural modulus and strength increased up to 55.55% and 43.30% respectively. However, with higher loading of 3 wt. % both viscoelastic and flexural properties of 3D printed samples drastically reduced thus undermining the feasibility of 3D printing biochar reinforced epoxies at higher loadings.

Direct write printing of a self-encapsulating liquid metal–silicone composite

Soft Matter ◽  
2020 ◽  
Vol 16 (28) ◽  
pp. 6608-6618
Author(s):  
Taylor V. Neumann ◽  
Emily G. Facchine ◽  
Brian Leonardo ◽  
Saad Khan ◽  
Michael D. Dickey
Keyword(s):  
Thermal Properties ◽  
Liquid Metal ◽  
Metal Particles ◽  
Mechanical And Thermal Properties ◽  
Direct Write

Silicone composites featuring inclusions of liquid metal particles are soft and stretchable materials with useful electric, dielectric, mechanical, and thermal properties.

Flexible Strain Sensor Using Additive Manufacturing and Conductive Liquid Metal: Design, Fabrication, and Characterization

2018 ◽  
Author(s):  
Austin Smith ◽  
Hamzeh Bardaweel
Keyword(s):  
3D Printing ◽  
Liquid Metal ◽  
Strain Sensor ◽  
Gauge Factor ◽  
Limiting Factor ◽  
Successful Implementation ◽  
Conductive Liquid ◽  
Fused Deposition ◽  
3D Printed ◽  
Flexible Strain Sensor

In this work a flexible strain sensor is fabricated using Fused Deposition Modeling (FDM) 3D printing technique. The strain sensor is fabricated using commercially available flexible Thermoplastic Polyurethane (TPU) filaments and liquid metal Galinstan Ga 68.5% In 21% Sn 10%. The strain sensor consists of U-shape 2.34mm long and 0.2mm deep channels embedded inside a TPU 3D printed structure. The performance of the strain sensor is measured experimentally. Gauge Factor is estimated by measuring change in electric resistance when the sensor is subject to 13.2% – 38.6% strain. Upon straining and unstraining, results from characterization tests show high linearity in the range of 13.2% to 38.6% strain with very little hysteresis. However, changes due to permanent deformations are a limiting factor in the usefulness of these sensors because these changes limit the consistency of the device. FDM 3D printing shows promise as a method for fabricating flexible strain sensors. However, more investigation is needed to look at the effects of geometries and 3D printing process parameters on the yield elongation of the flexible filaments. Additionally, more investigation is needed to observe the effect of distorted dimensions of the 3D printed channels on the sensitivity of the strain sensor. It is anticipated that successful implementation of these commercially available filaments and FDM 3D printers will lead to reduction in cost and complexity of developing these flexible sensors.

Fabrication of a conductive composite structure with enhanced stretchability using direct-write 3D printing

2019 ◽  
Vol 6 (8) ◽  
pp. 085319
Author(s):  
Bijan Nasri-Nasrabadi ◽  
Akif Kaynak ◽  
Scott D Adams ◽  
Pejman Heidarian ◽  
Abbas Z Kouzani
Keyword(s):  
3D Printing ◽  
Composite Structure ◽  
Direct Write ◽  
Conductive Composite

scholarly journals Tunable structural color of bottlebrush block copolymers through direct-write 3D printing from solution

2020 ◽  
Vol 6 (24) ◽  
pp. eaaz7202 ◽  
Author(s):  
Bijal B. Patel ◽  
Dylan J. Walsh ◽  
Do Hoon Kim ◽  
Justin Kwok ◽  
Byeongdu Lee ◽  
...  
Keyword(s):  
3D Printing ◽  
Self Assembly ◽  
Three Dimensional ◽  
Size Control ◽  
Functional Materials ◽  
Domain Size ◽  
Direct Write ◽  
Processing Scheme ◽  
Solvent Vapor ◽  
Robust Processing

Additive manufacturing of functional materials is limited by control of microstructure and assembly at the nanoscale. In this work, we integrate nonequilibrium self-assembly with direct-write three-dimensional (3D) printing to prepare bottlebrush block copolymer (BBCP) photonic crystals (PCs) with tunable structure color. After varying deposition conditions during printing of a single ink solution, peak reflected wavelength for BBCP PCs span a range of 403 to 626 nm (blue to red), corresponding to an estimated change in d-spacing of >70 nm (Bragg- Snell equation). Physical characterization confirms that these vivid optical effects are underpinned by tuning of lamellar domain spacing, which we attribute to modulation of polymer conformation. Using in situ optical microscopy and solvent-vapor annealing, we identify kinetic trapping of metastable microstructures during printing as the mechanism for domain size control. More generally, we present a robust processing scheme with potential for on-the-fly property tuning of a variety of functional materials.

3D Printing of Free Standing Liquid Metal Microstructures

2013 ◽  
Vol 25 (36) ◽  
pp. 5081-5085 ◽  
Author(s):  
Collin Ladd ◽  
Ju-Hee So ◽  
John Muth ◽  
Michael D. Dickey
Keyword(s):  
3D Printing ◽  
Liquid Metal ◽  
Free Standing

Direct 3D Printing of Stretchable Circuits via Liquid Metal Co‐Extrusion Within Thermoplastic Filaments

2019 ◽  
Vol 21 (7) ◽  
pp. 1900060 ◽  
Author(s):  
Mohammad A. H. Khondoker ◽  
Adam Ostashek ◽  
Dan Sameoto
Keyword(s):  
3D Printing ◽  
Liquid Metal ◽  
Stretchable Circuits

Integrating helicoid channels for passive control of fiber alignment in direct-write 3D printing

2021 ◽  
pp. 102419
Author(s):  
Nava Raj Khatri ◽  
Md. Nurul Islam ◽  
Peng-Fei Cao ◽  
Rigoberto C. Advincula ◽  
Wonbong Choi ◽  
...  
Keyword(s):  
3D Printing ◽  
Passive Control ◽  
Direct Write ◽  
Fiber Alignment
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