Liwei Lin (Advisor)

Safe and deformable soft batteries are highly desirable for applications such as mobile electronics and conformable systems on irregular surfaces. Conventional Li-ion batteries rely on rigid packaging and hermetic sealing to block moisture intrusion and prevent leakage of toxic, flammable organic electrolytes. In contrast, recently reported deformable or stretchable batteries provide good conformability but suffer rapid performance degradation in ambient conditions, limiting their operating lifetimes. The fundamental challenge is that mechanical softness and gas impermeability are mutually...

Ultrasonics has been realized as a nondestructive measurement method for a variety of
applications, such as medical imaging, healthcare monitoring, structural testing, range finding, and motion sensing. Furthermore, high intensity ultrasound can be used in therapeutic treatments, such as lithotripsy for kidney stone comminution, hyperthermia for cancer therapy, high-intensity focused ultrasound (HIFU) for laparoscopic surgery and transcranial sonothrombolysis for brain stroke treatment. MEMS ultrasonic transducers are known to have several pronounced advantages over the conventional...