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Mohali, India — In a groundbreaking development, researchers at the Institute of Nano Science and Technology (INST), Mohali, have pioneered a novel droplet microfluidics technology that promises to fabricate cost-effective and efficient piezoelectric devices for wearable applications. These devices, which function as self-powered sensors, can monitor a wide range of physiological signals, marking a significant leap in wearable technology.
Polymer microspheres have garnered considerable interest due to their increased surface area and enhanced interface capabilities. However, traditional production methods often result in shape irregularities and high energy requirements. To overcome these challenges, the research team from INST has introduced a droplet microfluidics technology combined with off-chip thermal polymerization techniques to synthesize tunable Polyvinylidene fluoride (PVDF) microspheres with a high electroactive (EA) phase. These microspheres, characterized by their uniformity and monodispersity, show a narrow size distribution and have achieved an impressive EA phase enhancement of around 82%.
The process involved meticulous control over the flow rates of oil and polymer solution within the microfluidic device, coupled with extensive characterization to verify the piezoelectric response of the microspheres. By adjusting these flow rates and optimizing the reaction temperature, the researchers achieved precise size control of the microspheres, ranging from 126 to 754 µm.
Artificial intelligence (AI) played a crucial role in this advancement, enabling accurate predictions of microsphere diameter and phases, thus reducing the need for extensive laboratory optimization. This innovative approach was recently published in the Chemical Engineering Journal by Elsevier.
As a proof of concept, the research team explored the integration of PVDF microspheres into flexible piezoelectric devices that can seamlessly fit various parts of the human body, such as elbows and knees. These wearables harness energy generated from body movements, which would otherwise be wasted, to produce a substantial electrical response. The generated output voltage, approximately 23V, is sufficient to operate low-power devices, demonstrating the practical potential of this technology.
The integration of this technology into wearables paves the way for efficient energy harvesting from human motion, heralding an era of sustainable and self-sufficient wearable devices. The advantages of this method include simplicity, cost-effectiveness, high efficiency, and control, making it highly significant for applications in the biomedical sector and beyond.
This research underscores the collaborative potential of microfluidics, polymer science, and AI, driving the development of intelligent materials and revolutionizing the field of wearable technology.
About INST, Mohali: The Institute of Nano Science and Technology (INST), Mohali, an autonomous institute under the Department of Science and Technology, focuses on cutting-edge research in nanoscience and technology, aiming to address societal challenges through scientific advancements.
For further details, please refer to the recent publication in the Chemical Engineering Journal by Elsevier.
