Humidity-controlled direct ink writing for micro-additive manufacturing with water-based inks

Purpose The purpose of this paper is to provide additive manufacturing-based solutions for preparation of elastomeric foam with broaden compressive stress plateau. Design/methodology/approach Mechanic models are developed for obtaining designs of foam cell units with enhanced elastic buckling. An experimental approach is taken to fabricate the foams based on direct ink writing technique. Experimental and simulation data are collected to assist understanding of our proposals and solutions. Findings A simple tetragonal structured elastomeric foam is proposed and fabricated by direct ink writing, in which its cell unit is theoretically designed by repeating every four filament layers. The foam exhibits a broader stress plateau, because of the pronounced elastic buckling under compressive loading as predicted by the authors’ mechanic modeling. A two-stage stress plateaus as observed in the foam, being attributed to the dual elastic buckling of the cell units along two lateral directions of the XY plane during compression. Research limitations/implications Future work should incorporate more microscopic parameters to tune the elastomeric foam for mechanic performance testing on linear elastic deformation and densification of polymer matrix. Practical implications Additive manufacturing offers an alternative to fabricate elastomeric foam with controlled cell unit design and therefore mechanics. Our results comment on its broad space for development such superior cushioning or damping material in the fields of vibration and energy absorption. Originality/value This work has contributed to new knowledge on preparation of high performance elastomeric foam by providing a better understanding on its cell structure, being printed using direct ink writing machines.

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Direct ink writing of organic and carbon aerogels

Materials Horizons ◽

10.1039/c8mh00603b ◽

2018 ◽

Vol 5 (6) ◽

pp. 1166-1175 ◽

Cited By ~ 22

Author(s):

Swetha Chandrasekaran ◽

Bin Yao ◽

Tianyu Liu ◽

Wang Xiao ◽

Yu Song ◽

...

Keyword(s):

Additive Manufacturing ◽

Ion Transport ◽

Carbon Aerogels ◽

Direct Ink Writing ◽

3D Printed ◽

Fast Ion ◽

Large Capacitance

Additive manufacturing is used to overcome inherent aerogel limitations. 3D printed aerogels simultaneously exhibit large capacitance and fast ion transport in millimeter-thick electrodes.

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Additive manufacturing of composites made of epoxy resin with magnetite particles fabricated with the direct ink writing technique

Journal of Composite Materials ◽

10.1177/0021998319865019 ◽

2019 ◽

Vol 54 (5) ◽

pp. 647-657 ◽

Cited By ~ 2

Author(s):

Jose J Restrepo ◽

Henry A Colorado

Keyword(s):

Additive Manufacturing ◽

Epoxy Resin ◽

Large Scale ◽

Distribution Density ◽

Particulate Composites ◽

Resin Matrix ◽

Direct Ink Writing ◽

Composites Materials ◽

Structural Applications ◽

Magnetite Particles

In this investigation, particulate composites materials made of epoxy resin matrix with magnetite particles were fabricated via additive manufacturing with the direct ink writing technique. Magnetite is an inexpensive material and the direct ink writing process is not only inexpensive but also easy to adapt to any material. A total of eight formulations were investigated, from which only four were feasible for the printing process: 32.6, 33.6, 35.4 and 41 wt.% of particles. The composites were characterized by scanning electron microscopy, compressive strength, particle size distribution, density, and ductility. Results showed that composites exhibit very competitive mechanical properties even though the process was not vacuum assisted, therefore enabling them to be used in large scale and in other structural applications. Composite can be used in electromagnetic shielding.

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3D printed gradient index glass optics

Science Advances ◽

10.1126/sciadv.abc7429 ◽

2020 ◽

Vol 6 (47) ◽

pp. eabc7429

Author(s):

Rebecca Dylla-Spears ◽

Timothy D. Yee ◽

Koroush Sasan ◽

Du T. Nguyen ◽

Nikola A. Dudukovic ◽

...

Keyword(s):

Refractive Index ◽

Additive Manufacturing ◽

Flat Glass ◽

Gradient Index ◽

Direct Ink Writing ◽

Optical Functions ◽

3D Printed ◽

Gradient Refractive Index ◽

Compositional Gradients ◽

Glass Optics

We demonstrate an additive manufacturing approach to produce gradient refractive index glass optics. Using direct ink writing with an active inline micromixer, we three-dimensionally print multimaterial green bodies with compositional gradients, consisting primarily of silica nanoparticles and varying concentrations of titania as the index-modifying dopant. The green bodies are then consolidated into glass and polished, resulting in optics with tailored spatial profiles of the refractive index. We show that this approach can be used to achieve a variety of conventional and unconventional optical functions in a flat glass component with no surface curvature.

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Additive Manufacturing of Dense Ceramic Parts via Direct Ink Writing of Aqueous Alumina Suspensions

International Journal of Applied Ceramic Technology ◽

10.1111/ijac.12557 ◽

2016 ◽

Vol 13 (5) ◽

pp. 821-830 ◽

Cited By ~ 54

Author(s):

Lisa Rueschhoff ◽

William Costakis ◽

Matthew Michie ◽

Jeffrey Youngblood ◽

Rodney Trice

Keyword(s):

Additive Manufacturing ◽

Direct Ink Writing ◽

Dense Ceramic ◽

Alumina Suspensions

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Additive manufacturing of boron carbide via continuous filament direct ink writing of aqueous ceramic suspensions

Journal of the European Ceramic Society ◽

10.1016/j.jeurceramsoc.2016.06.002 ◽

2016 ◽

Vol 36 (14) ◽

pp. 3249-3256 ◽

Cited By ~ 53

Author(s):

William J. Costakis ◽

Lisa M. Rueschhoff ◽

Andres I. Diaz-Cano ◽

Jeffrey P. Youngblood ◽

Rodney W. Trice

Keyword(s):

Additive Manufacturing ◽

Boron Carbide ◽

Direct Ink Writing ◽

Continuous Filament ◽

Ceramic Suspensions

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Polymer-Derived Biosilicate®-like Glass-Ceramics: Engineering of Formulations and Additive Manufacturing of Three-Dimensional Scaffolds

Materials ◽

10.3390/ma14185170 ◽

2021 ◽

Vol 14 (18) ◽

pp. 5170

Author(s):

Fulden Dogrul ◽

Paulina Ożóg ◽

Martin Michálek ◽

Hamada Elsayed ◽

Dušan Galusek ◽

...

Keyword(s):

Tissue Engineering ◽

Additive Manufacturing ◽

Room Temperature ◽

Three Dimensional ◽

Glass Ceramics ◽

Gas Release ◽

Carbon Phase ◽

Digital Light Processing ◽

Direct Ink Writing ◽

Additive Manufacturing Technology

Silicone resins, filled with phosphates and other oxide fillers, yield upon firing in air at 1100 °C, a product resembling Biosilicate® glass-ceramics, one of the most promising systems for tissue engineering applications. The process requires no preliminary synthesis of parent glass, and the polymer route enables the application of direct ink writing (DIW) of silicone-based mixtures, for the manufacturing of reticulated scaffolds at room temperature. The thermal treatment is later applied for the conversion into ceramic scaffolds. The present paper further elucidates the flexibility of the approach. Changes in the reference silicone and firing atmosphere (from air to nitrogen) were studied to obtain functional composite biomaterials featuring a carbon phase embedded in a Biosilicate®-like matrix. The microstructure was further modified either through a controlled gas release at a low temperature, or by the revision of the adopted additive manufacturing technology (from DIW to digital light processing).

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