From moon landings to mobile phones, many of the farfetched visions of science fiction have transformed into reality. In the latest example of this trend, scientists report that they have developed a powerful printer that could streamline the creation of self-assembling structures that can change shape after being exposed to heat and other stimuli. They say this unique technology could accelerate the use of 4-D printing in aerospace, medicine and other industries.
The researchers are presenting their work today at the 255th National Meeting & Exposition of the American Chemical Society (ACS). ACS, the world’s largest scientific society, is holding the meeting here through Thursday. It features more than 13,000 presentations on a wide range of science topics.
We are on the cusp of creating a new generation of devices that could vastly expand the practical applications for 3-D and 4-D printing,” H. Jerry Qi, Ph.D., says. “Our prototype printer integrates many features that appear to simplify and expedite the processes used in traditional 3-D printing. As a result, we can use a variety of materials to create hard and soft components at the same time, incorporate conductive wiring directly into shape-changing structures, and ultimately set the stage for the development of a host of 4-D products that could reshape our world.”
4-D printing is an emerging technology that allows 3-D-printed components to change their shape over time after exposure to heat, light, humidity and other environmental triggers. However, 4-D printing remains challenging, in part because it often requires complex and time-consuming post-processing steps to mechanically program each component. In addition, many commercial printers can only print 4-D structures composed of a single material.
Last year, Qi and his colleagues at Georgia Institute of Technology, in collaboration with scientists at the Singapore University of Technology and Design, used a composite made from an acrylic and an epoxy along with a commercial printer and a heat source to create 4-D objects, such as a flower that can close its petals or a star that morphs into a dome. These objects transformed shape up to 90 percent faster than previously possible because the scientists incorporated the tedious mechanical programming steps directly into the 3-D printing process. Building on this work, the researchers sought to develop an all-in-one printer to address other 4-D printing challenges and move the technology closer to practical application.
The machine they ultimately devised combines four different printing techniques, including aerosol, inkjet, direct ink write and fused deposition modeling. It can handle a multitude of stiff and elastic materials including hydrogels, silver nanoparticle-based conductive inks, liquid crystal elastomers and shape memory polymers, or SMPs. SMPs, which are the most common substances used in 4-D printing, can be programmed to “remember” a shape and then transform into it when heated. With this new technology, the researchers can print higher-quality SMPs capable of making more intricate shape changes than in the past, opening the door for a multitude of functional 4-D applications and designs.
The researchers can also use the printer to project a range of white, gray or black shades of light to form and cure a component into a solid. This grayscale lighting triggers a crosslinking reaction that can alter the component’s behavior, depending on the grayscale of shade shined on it. So, for example, a brighter light shade creates a part that is harder, while a darker shade produces a softer part. As a result, these components can bend or stretch differently than other parts of the 4-D structure around them.
The printer can even create electrical wiring that can be printed directly onto an antenna, sensor or other electrical device. The process relies on a direct-ink-write method to produce a line of silver nanoparticle ink. A photonic cure unit dries and coalesces the nanoparticles to form conductive wire. Then, the printer’s ink-jet component creates the plastic coating that encases the wire.
Currently, Qi’s team is also working with Children’s Healthcare of Atlanta to determine whether this new technology could print prosthetic hands for children born with malformed arms.
“Only a small group of children have this condition, so there isn’t a lot of commercial interest in it and most insurance does not cover the expense,” Qi says. “But these children have a lot of challenges in their daily lives, and we hope our new 4-D printer will help them overcome some of these difficulties.”
The Latest on: 4-D printing
via Google News
The Latest on: 4-D printing
- Nexa3D’s Webinar on PepsiCo’s 3D Printing Developmentson August 5, 2022 at 9:30 am
Charles R. Goulding and Preeti Sulibhavi examine how PepsiCo was able to leverage advanced 3D printing technology.
- Multi-nozzle MF3 tech could revolutionize 3D printingon August 4, 2022 at 10:34 am
Although 3D printing technology continues to improve, it's still limited by relatively long print times and low resolution. A new technology could help, by simultaneously utilizing multiple small ...
- Research and Markets: Europe Polypropylene In 3D Printing Market Poised to Hit $4.08 Billion by 2030 - ResearchAndMarkets.comon August 4, 2022 at 9:23 am
The "Europe Polypropylene In 3D Printing Market Size, Share Trends Analysis Report by Form (Filament, Powder), by End Use (Automotive, Medical, Aerospace Defense, Consumer Goods), by Country, and Segm ...
- Europe Polypropylene In 3D Printing Market Poised to Hit $4.08 Billion by 2030 - ResearchAndMarkets.comon August 4, 2022 at 9:17 am
The Europe polypropylene in 3D printing market size is expected to reach USD 4,084.44 million by 2030. The market is expected to expand at a CAGR of 15.2% from 2022 to 2030. The regional market is ...
- A breakthrough 3D-printed material incredibly strong and ductileon August 4, 2022 at 9:03 am
A new 3D-printed high-performance nanostructured alloy which is incredibly strong and ductile, could open doors for medicine and the aerospace industry. A dual-phase, nanostructured high-entropy alloy ...
- These 3D-printed dirt walls grow a garden when you water themon August 4, 2022 at 3:00 am
A team of designers in Jerusalem wants to swap concrete and reinforcement steel for living walls entirely made of natural materials.
- 3D Printing Metal Market Size is projected to reach USD 3.61 billion by 2030, growing at a CAGR of 25.3%: Straits Researchon August 3, 2022 at 9:15 am
The global 3D printing metal market was valued at USD 475 million in 2021. It is expected to reach USD 3,615 million by 2030, growing at a CAGR of 25.3% during the forecast period (2022–2030). North ...
- New 3D printing process is faster and more precise than conventional methodson August 2, 2022 at 8:34 am
Engineers have created a way to 3D print large and complex parts at a fraction of the cost of current methods.
- 3D Printing Process Created by Rutgers Researchers Is Faster and More Precise Than Conventional Methodson August 1, 2022 at 11:39 am
Known as Multiplexed Fused Filament Fabrication, the technique “could be a game changer for the 3D-printing industry,” says lead author of study Rutgers engineers have created a way to 3D print large ...
via Bing News