In ‘Fabrication of Graphene-Reinforced Nanocomposites with Improved Fracture Toughness in Net Shape for Complex 3D Structures via Digital Light Processing,’ authored by Chinese and UK authors, the question remains as to whether digital light processing can be used to create a facture toughness specimen without numerous notch preparation steps—and affordably so.
DLP is a vat-polymerization-based 3D printing method popular with many researchers, and one like SLA—except that objects are created in a layering process instead of point by point. Here, the authors had a keen interest in nanocomposites, exploring the potential for improving mechanical properties in parts, despite limited use with such materials in DLP so far. Historically, this has been due to challenges presented by nanoparticles during 3D printing.
“The resin viscosity and subsequent printability could be affected when nanoparticles, such as graphene, with large surface areas are introduced. The presence of graphene could also block UV light, thus interfering with the photocuring process of resin,” stated the authors.
Previous researchers have encountered issues with viscosity ‘hindering printing,’ although the authors remain positive about using DLP for curing of nanofiller resins.
“It is also worth noting that with DLP 3D printing, nanocomposites can be fabricated into a net shape directly without multistep molding, cutting, and other steps, which could be utilized to make complexly shaped structures with improved properties,” state the researchers.
In the course of this research, the team developed their own resin that relies on UV curing, and includes graphene-reinforced nanocomposites (GNPs). Ultimately, they were able to complete a 3D print with a complex geometry—without using solvents. They also reported success with high resolution and reproducibility, accompanied by affordability.
“A gyroid scaffold for tissue engineering applications based on current GNP nanocomposite resins has been successfully fabricated via DLP, demonstrating the suitability of current resins for complexly shaped structures as well as potential for applications in various fields such as bone tissue engineering,” stated the authors.
Viscosity continued to be a major consideration throughout the project, and the researchers considered to notice the challenges in setting parameters, with low viscosity required for DLP printing (as well as SLA). If viscosity became too high, there was the possibility for deformation or complete failure. Along with viscosity characterization and examination, the authors were also aware of how thermomechanical properties affected the process, ‘confirming no obvious effect on the printability or the photocuring process…’
The research team noted relative ‘homogeneous nanofiller dispersion’ during the rapid curing, along with an improvement of mechanical properties with only 0.5 wt. percent, showing a 14 percent increment in flexural modulus and a 28 percent improvement in fracture toughness.
Success was achieved in terms of creating numerous specimens, ‘indicating the effectiveness of using the current method to perform rapid trials on new formulations with improved fracture toughness.’
“With the developed graphene-reinforced resins, 3D complex structures including a jawbone with a square architecture as well as gyroid scaffold for bone tissue engineering applications were successfully fabricated via DLP, showing the great potential of current UV-curable nanocomposite resin systems for various applications in fields such as bioengineering,” concluded the researchers.
Whether you are a manufacturer, serious innovator, or a hobbyist just thinking about purchasing your first 3D printer, you may be surprised to find out how much thought goes into materials. And for those who are serious about making strong new prototypes and parts, if they don’t have what they need—let the experimenting begin! This is the case in workshops and labs around the world, whether users are busy testing out clay composites, combinations of titanium and ceramic, or even wood. Find out more about graphene nanocomposites here.[Source / Images: Fabrication of Graphene-Reinforced Nanocomposites with Improved Fracture Toughness in Net Shape for Complex 3D Structures via Digital Light Processing]
You May Also Like
Roboze’s Exclusive Subscription Plan to Print Parts Near Point of Production
COVID-19 unveiled production gaps in the current global supply chain as parts are produced in central location and shipped all over the world: that’s why the Roboze vision is to...
3D Printing News Briefs: December 20, 2020: iFactory3D, Farsoon, DMC & Produmax, EOS
In 3D Printing News Briefs this weekend, we’re talking about a successful 3D printer Kickstarter campaign, a high-temperature material, a partnership, and a new podcast. The Factory One 3D printer...
GoEngineer Now Largest U.S. Distributor of VELO3D’s Metal 3D Printing Solutions
After a few years of working in secret, privately funded metal 3D printing startup VELO3D came on to the scene with a bang with the introduction of its innovative, patented...
Farsoon Launches Flame-Retardant Material and Post-Processing Solutions at Formnext
Farsoon Europe and Tiger Coatings have successfully developed a specialized thermoset material, with flame-retardant properties, for polymer laser sintering using Farsoon’s HT252P industrial 3D printing system. The material, TIGITAL 3D-Set...
View our broad assortment of in house and third party products.