Key Takeaways
- MIT researchers have developed low-cost triaxial electrospray emitters for efficient manufacturing of drug-delivery particles and self-healing materials.
- The emitters can produce multilayered droplets quickly with uniformity, enhancing applications in biosensors and tissue regeneration.
- The 3D-printed devices allow for complex designs without the need for expensive cleanroom processes, democratizing access to advanced technology.
Innovative Manufacturing Technology
MIT researchers have introduced a new approach to manufacturing specialized electronic nozzles known as triaxial electrospray emitters. These devices have the potential to revolutionize the creation of time-release drug-delivery particles and self-healing materials in a cost-effective and scalable manner.
Triaxial electrospray emitters utilize high voltages to dispense three immiscible liquids from their microscopic nozzles, producing uniform droplets composed of distinct layers. This technology allows for the development of drug-delivery nanoparticles, where the outer layer disintegrates slowly in the stomach, exposing a second material that controls the release of medication to targeted areas in the intestines.
Traditionally, the development of such electrospray arrays has required expensive microfabrication techniques within semiconductor cleanrooms, which has limited widespread application. To address these challenges, researchers at MIT employed 3D printing to create arrays featuring 16 nozzles within a square centimeter area. The innovative one-step fabrication process takes only a few hours to produce these intricate devices, setting them apart from conventional methods.
In tests, the 3D-printed arrays produced consistent, three-layered droplets at a high scale, essential for creating layered microparticles used in various applications, including biosensing and tissue regeneration. Principal research scientist Luis Fernando Velásquez-García emphasized the significance of this technology: “The particles these devices generate can have a big impact in many applications. We want to democratize this technology so the benefits can touch many more people.”
The efficacy of the electrospray emitters lies in their design. Each nozzle is part of an array of three concentric structures that simultaneously emit different liquids. The electrospray process enables the rapid generation of smaller droplets compared to other methods, which is vital in ensuring that the emitters operate efficiently and uniformly.
Manufacturing multi-emitter devices traditionally involves significant constraints regarding size and shapes due to cleanroom requirements. However, this research breaks new ground, as a miniaturized triaxial electrospray array has not been previously reported in available literature.
The researchers utilized a 3D-printing technique called vat photopolymerization, which allows fine layers of liquid resin to be solidified using light. This technique enables the creation of complex geometries, necessary for the intricate design of electrospray emitters. The precision of this method resulted in layers as thin as 25 micrometers, significantly enhancing the internal layout needed for these devices.
Each array, comparable in size to a U.S. penny, boasts a network of coiled microchannels that supply liquid to all nozzles uniformly. This design prevents interference among the emitters, a critical aspect of maintaining consistency in droplet production.
Researchers have refined their designs to optimize flow rates and voltages, ensuring the thickness of each microdroplet layer can be precisely controlled. The role of the viscosity of the middle liquid has been identified as crucial for maintaining droplet stability and layer thickness.
Looking ahead, the team plans to continue enhancing their fabrication techniques and designs, aiming to achieve even smaller dimensions and integrate advanced materials into future electrospray emitter arrays. This continuous development promises greater possibilities for scientific and entrepreneurial innovation, further expanding the impact of this technology.
The content above is a summary. For more details, see the source article.