Every year, the planet produces about 62 million tons of electronic wastean impressive figure that continues to grow with the increase in the use of digital devices. However, less than 25% of these waste is actually recycledDespite containing precious metals such as gold, copper and Palladio. The reason? Much of the problem is related to Difficulty recycling traditional printed circuits (PCB)heart of every electronic device.
Today, a new technology developed by a team of researchers from the universities of Maryland, Georgia Tech and Notre Dame could radically change the rules of the game: it’s called Dissolvpcband is a completely recyclable and biodegradable printed circuit.
The printed circuit that melts in the water and leaves only reusable materials
The principle at the base of DissolvPCB is as simple as it is brilliant: eliminating the materials that are difficult to dispose of, such as the fiberglass and epoxy resinand replace them with biodegradable materials. In particular, the substrate is made with polyvinyl alcohol (PVA)a soluble plastic in water, while the conductive slopes are created with liquid metal (an alloy of Gallium and Stock) that flows inside 3D printed channels.
Once the device is no longer needed, just immerse it in the water: The PVA dissolvesfreeing intact electronic components and liquid metal dropsready to be recovered and reused. All without the use of toxic substances or complex industrial processes.
One of the great advantages of this innovation is his accessibility. The researchers made DissolvPCB using tools available to anyone: A standard 3D FDM printer, PVA filament available online And Liquid metal easily purchased. No industrial infrastructure is needed, making this technology also suitable for School workshops, Fab Lab or Startup.
In addition, a Open Source Plugin for FreeCadwhich allows to convert projects of traditional circuits into 3D printable versions. In this way, hobbyists, engineers and designers They can immediately start experimenting with this technology, without particular additional skills.
During the tests, the researchers immersed a circuit for the detection of the magnetic field in a bowl of water. At room temperature, the complete dissolution took place in about 36 hoursbut With agitation and heat the process has been reduced to less than an hour. The PVA was subsequently dried, ground and reused to create new filament for 3D printing.
The environmental impact is drastically reduced: the data confirm it
To evaluate the environmental sustainability of dissolvpcb, the team led one Evaluation of the life cycle (LCA) comparing the new PCBs with traditional ones. The results were surprising: greenhouse gas emissions have been reduced by an order of magnitudeAnd The overall impact on toxicity and use of fossil fuels has collapsed.
Almost the 98% of the materials used in the process was recovered for a new use. Although not yet perfect, it is a huge step forward towards sustainable electronics.
The researchers did not limit themselves to theory. They demonstrated the effectiveness of technology by creating three completely functioning devices:
All three devices were easily recycled after use. In addition, the 3D printed nature of the circuits allows you to integrate them into Curvy or sculptural objectsovercoming the rigidity limits of traditional cards.
One of the most innovative prototypes was a Interactive cube with joystick and ledcompletely printed in 3D, in which the electronics was incorporated into the structure of the object itself.
Despite the advantages, DissolvPCB also presents some limitations. The printed channels cannot be as thin as the engraved copper tracks, making the cards more bulky. This means that, at the moment, technology is not suitable for compact devices such as smartphone or smartwatch.
Also, theexposure to humidity or water could compromise its operation. However, this problem can be solved with waterproof protective shellsas already happens in many electronic devices.
For now, DissolvPCB represents a Ideal solution for prototyping, teaching and small productionsbut with the evolution of high resolution 3D printing, it could become the basis of the next generation of sustainable electronic devices.
The fact that the project is Open Source favors continuous evolution: other independent research teams or makers can contribute to improve their efficiency, precision and scalability.
