Synthesis, Rheology, and Assessment of 3D Printability of Multifunctional Polyesters for Extrusion-Based Direct-Write 3D Printing

2021 ◽  
Author(s):  
Tanmay Jain ◽  
Yen-Ming Tseng ◽  
Chinnapatch Tantisuwanno ◽  
Joshua Menefee ◽  
Aida Shahrokhian ◽  
...  
Keyword(s):  
3D Printing ◽  
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.

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

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.

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

Poly(alkyl glycidyl ether) hydrogels for harnessing the bioactivity of engineered microbes

2019 ◽  
Vol 219 ◽  
pp. 58-72 ◽  
Author(s):  
Trevor G. Johnston ◽  
Christopher R. Fellin ◽  
Alberto Carignano ◽  
Alshakim Nelson
Keyword(s):  
3D Printing ◽  
Glycidyl Ether ◽  
Direct Write ◽  
Whole Cell ◽  
Whole Cell Catalysis

Herein, we describe a method to produce yeast-laden hydrogel inks for the direct-write 3D printing of cuboidal lattices for immobilized whole-cell catalysis.

Cross-linkable multi-stimuli responsive hydrogel inks for direct-write 3D printing

2017 ◽  
Vol 8 (29) ◽  
pp. 4199-4206 ◽  
Author(s):  
Dylan G. Karis ◽  
Robert J. Ono ◽  
Musan Zhang ◽  
Ankit Vora ◽  
Duane Storti ◽  
...  
Keyword(s):  
3D Printing ◽  
Uv Light ◽  
Direct Write ◽  
Stimuli Responsive ◽  
3D Printed

Triple-stimuli responsive hydrogel can be 3D printed and cross-linked in the presence of a photoradical generator and 365 nm UV light.

Chemical modification and printability of shear-thinning hydrogel inks for direct-write 3D printing

Polymer ◽  
2018 ◽  
Vol 152 ◽  
pp. 42-50 ◽  
Author(s):  
Patrick T. Smith ◽  
Amrita Basu ◽  
Abhijit Saha ◽  
Alshakim Nelson
Keyword(s):  
3D Printing ◽  
Chemical Modification ◽  
Shear Thinning ◽  
Direct Write

Direct-print photopolymerization for 3D printing

2017 ◽  
Vol 23 (2) ◽  
pp. 337-343 ◽  
Author(s):  
Morteza Vatani ◽  
Jae-Won Choi
Keyword(s):  
3D Printing ◽  
Shear Thinning ◽  
Direct Write ◽  
Content Type ◽  
3D Structures ◽  
Standard Guideline ◽  
Original Contribution ◽  
Printing System ◽  
Shape Retention

Purpose This work aims to present a guideline for ink development used in extrusion-based direct-write (DW) (also referred to as direct-print [DP]) technique and combine the extrusion with instant photopolymerization to present a solvent-free DP photopolymerization (DPP) method to fill the gap between 3D printing and printing multi-functional 3D structures. Design/methodology/approach A DP process called DPP was developed by integration of a screw-driven micro-dispenser into XYZ translation stages. The process was equipped with direct photopolymerization to facilitate the creation of 3D structures. The required characteristics of inks used in this technique were simulated through dispersion of fumed silica particles into photocurable resins to transform them into viscoelastic inks. The characterization method of these inks and the required level of shear thinning and thixotropic properties is presented. Findings Shear thinning and thixotropic properties are necessary components of the inks used in DPP process and other DP techniques. These properties are desirable to facilitate printing and filament shape retention. Extrusion of viscoelastic inks out of a nozzle generates a filament capable of retaining its geometry. Likewise, instant photopolymerization of the dispensed filaments prevents deformation due to the weight of filaments or accumulated weight of layers. Originality/value The DPP process with material-reforming methods has been shown, where there remain many shortcomings in realizing a DP-based 3D printing process with instant photopolymerization in existing literature, as well as a standard guideline and material requirements. The suggested method can be extended to develop a new commercial 3D printing system and printable inks to create various functional 3D structures including sensors, actuators and electronics, where nanoparticles are involved for their functionalities. Particularly, an original contribution to the determination of a rheological property of an ink is provided.

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