دانلود کتاب پارچه های هوشمند خودکار برای فناوری های پوشیدنی

Recent development in miniaturize electronic devices with higher computational capabilities and ultra-low-power communication technologies involves a tendency toward powering these devices with high-energy efficiency, long cycle life, fast and cheap manufacturing and low weight power sources. Mechanical energy harvesters are needed for such diverse applications such as self-powered wireless sensors, structural and human health monitoring systems and cheaply harvesting energy from human movements. Integration of piezoelectric materials and novel fabrication strategies with conventional textile process established the emergence of wearable technology field which can meet these needs. In particular, fiber-based electronic devices can be integrated into garments with desirable attributes such as flexibility, stretchability, permeability and lightweight. Piezoelectric fibers are an ideal inter- face platform option between environment, electronic devices and human’s body, and polyvinylidene fluoride (PVDF) is highlighted in the wearable technology field due to its good chemical resistance, strength, thermal resistance and stable and large piezoelectric, ferroelectric and pyroelectric properties. Previous work has shown that PVDF fibers can be integrated into textile-based mechanical energy harvesters and have highlighted the potential for further improvement. The current challenges include slow processing, low-energy conversion efficiency and difficulty in inte- grating the fibers (and associated interconnecting electrodes) into textile garments. Therefore, the aim of this project is to fabricate and characterize piezoelectric fibers suitable for ready integration into textile materials. The book considers methods of fiber formation (including the use of additives to enhance the piezoelectric coeffi- cient) and develops novel textile structures (weave, knit, braid, coil) with embedded electrodes. The flexibility and small diameter of the final fiber make it possible to use them in garment without affecting structure or comfort. Finally, the performance of the fiber generators was evaluated through different applications such as air and water sensor, health and movement monitoring and energy generator.