scholarly journals 3D direct printing of mechanical and biocompatible hydrogel meta-structures

2021 ◽  
Author(s):  
Lei Zhang ◽  
Wenhan Lee ◽  
Xinhao Li ◽  
Yanhui Jiang ◽  
Nicholas Xuanlai Fang ◽  
...  
Keyword(s):  
Direct Printing

scholarly journals Design and Characterization of a Screw Extrusion Hot-End for Fused Deposition Modeling

Molecules ◽  
2021 ◽  
Vol 26 (3) ◽  
pp. 590
Author(s):  
Tim Feuerbach ◽  
Markus Thommes
Keyword(s):  
Vinyl Acetate ◽  
Fused Deposition Modeling ◽  
Ethylene Vinyl Acetate ◽  
Direct Printing ◽  
Fused Deposition ◽  
Screw Extrusion ◽  
Deposition Modeling ◽  
Feedstock Material ◽  
Material Form

The filament is the most widespread feedstock material form used for fused deposition modeling printers. Filaments must be manufactured with tight dimensional tolerances, both to be processable in the hot-end and to obtain printed objects of high quality. The ability to successfully feed the filament into the printer is also related to the mechanical properties of the filament, which are often insufficient for pharmaceutically relevant excipients. In the scope of this work, an 8 mm single screw hot-end was designed and characterized, which allows direct printing of materials from their powder form and does not require an intermediate filament. The capability of the hot-end to increase the range of applicable excipients to fused deposition modeling was demonstrated by processing and printing several excipients that are not suitable for fused deposition modeling in their filament forms, such as ethylene vinyl acetate and poly(1-vinylpyrrolidone-co-vinyl acetate). The conveying characteristic of the screw was investigated experimentally with all materials and was in agreement with an established model from literature. The complete design information, such as the screw geometry and the hot-end dimensions, is provided in this work.

Solvent-free, direct printing of organic semiconductors in atmosphere

2010 ◽  
Vol 96 (26) ◽  
pp. 263301 ◽  
Author(s):  
Shaurjo Biswas ◽  
Kevin P. Pipe ◽  
Max Shtein
Keyword(s):  
Organic Semiconductors ◽  
Solvent Free ◽  
Direct Printing

scholarly journals Enabling internal electronic circuitry within additively manufactured metal structures – the effect and importance of inter-laminar topography

2018 ◽  
Vol 24 (1) ◽  
pp. 204-213
Author(s):  
Ji Li ◽  
Tom Monaghan ◽  
Robert Kay ◽  
Ross James Friel ◽  
Russell Harris
Keyword(s):  
Ion Beam ◽  
Content Type ◽  
Metal Structures ◽  
Ultrasonic Additive Manufacturing ◽  
Direct Printing ◽  
Electronic Circuitry ◽  
Dual Beam ◽  
Focussed Ion Beam ◽  
Scanning Electron Microscope Investigation ◽  
Electrical Materials

Purpose This paper aims to explore the potential of ultrasonic additive manufacturing (UAM) to incorporate the direct printing of electrical materials and arrangements (conductors and insulators) at the interlaminar interface of parts during manufacture to allow the integration of functional and optimal electrical circuitries inside dense metallic objects without detrimental effect on the overall mechanical integrity. This holds promise to release transformative device functionality and applications of smart metallic devices and products. Design/methodology/approach To ensure the proper electrical insulation between the printed conductors and metal matrices, an insulation layer with sufficient thickness is required to accommodate the rough interlaminar surface which is inherent to the UAM process. This in turn increases the total thickness of printed circuitries and thereby adversely affects the integrity of the UAM part. A specific solution is proposed to optimise the rough interlaminar surface through deforming the UAM substrates via sonotrode rolling or UAM processing. Findings The surface roughness (Sa) could be reduced from 4.5 to 4.1 µm by sonotrode rolling and from 4.5 to 0.8 µm by ultrasonic deformation. Peel testing demonstrated that sonotrode-rolled substrates could maintain their mechanical strength, while the performance of UAM-deformed substrates degraded under same welding conditions ( approximately 12 per cent reduction compared with undeformed substrates). This was attributed to the work hardening of deformation process which was identified via dual-beam focussed ion beam–scanning electron microscope investigation. Originality/value The sonotrode rolling was identified as a viable methodology in allowing printed electrical circuitries in UAM. It enabled a decrease in the thickness of printed electrical circuitries by ca. 25 per cent.

Facile synthesis of water soluble reduced graphene oxide with a high concentration and its application in printable micro-supercapacitors

2017 ◽  
Vol 1 (7) ◽  
pp. 1601-1610 ◽  
Author(s):  
Haibo Su ◽  
Pengli Zhu ◽  
Leicong Zhang ◽  
Fengrui Zhou ◽  
Xianwen liang ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Efficient Method ◽  
Water Soluble ◽  
High Concentration ◽  
Facile Synthesis ◽  
Direct Printing ◽  
Reduced Graphene

A facile and efficient method has been developed to synthesize water soluble graphene (WSG), and MSCs could be easily fabricated by direct printing using WSG-based ink.

Direct printing of gratings on sol-gel layers

1998 ◽  
Vol 37 (4) ◽  
pp. 1130 ◽  
Author(s):  
Philippe Arguel
Keyword(s):  
Sol Gel ◽  
Direct Printing

scholarly journals Off-Axis Diffractive Optics for Compact Terahertz Detection Setup

2020 ◽  
Vol 10 (23) ◽  
pp. 8594
Author(s):  
Paweł Komorowski ◽  
Mateusz Surma ◽  
Michał Walczakowski ◽  
Przemysław Zagrajek ◽  
Agnieszka Siemion
Keyword(s):  
3D Printing ◽  
Small Volume ◽  
Optical Element ◽  
Structure Design ◽  
Thz Radiation ◽  
Direct Printing ◽  
Terahertz Detection ◽  
3D Printed ◽  
Printing Techniques ◽  
Optical Structure

Medical and many other applications require small-volume setups enabling terahertz imaging. Therefore, we aim to develop a device for the in-reflection examination of the samples. Thus, in this article, we focus on the diffractive elements for efficient redirection and focusing of the THz radiation. A terahertz diffractive optical structure has been designed, optimized, manufactured (using extrusion-based 3D printing) and tested. Two manufacturing methods have been used—direct printing of the structures from PA12, and casting of the paraffin structures out of 3D-printed molds. Also, the limitations of the off-axis focusing have been discussed. To increase the efficiency, an iterative algorithm has been proposed that optimizes off-axis structures to focus the radiation into small focal spots located far from the optical axis, at an angle of more than 30 degrees. Moreover, the application of higher-order kinoform structure design allowed the maintaining of the smallest details of the manufactured optical element, using 3D printing techniques.

scholarly journals Direct Printing of Gold Nano-Particles by Laser Induced Dewetting

2019 ◽  
Author(s):  
J. H. Yoo ◽  
N. J. Ray ◽  
H. T. Nguyen ◽  
M. A. Johnson ◽  
S. Baxamusa ◽  
...  
Keyword(s):  
Nano Particles ◽  
Direct Printing ◽  
Gold Nano Particles
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