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 Ziaie Biomedical Purdue University / Discovery Park Logo

 Microdevices Laboratory

   Sensors & Actuators        Energy Harvesting        Implantable Microsystems        Microfluidics        Flexible Bioelectronics    


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EFRI-BioFLEX: Tissue Engineered Flexible Sensors, Actuators and Electronics for Chronic Wound Management
We are currently developing a smart wound dressing platform for chronic wounds as part of an NSF-funded project led by Ali Khademhosseini of the Brigham and Women's Hospital, in collaboration with Mehmet Dokmeci of Brigham and Women's Hospital, Sameer Sonkusale of Tufts University, and Babak Ziaie of Purdue University. The platform will integrate electronics and an array of physical, chemical, and biological modules capable of sensing (physical and chemical) and active intervention (biological, chemical, and physical) in the wound microenvironment. This platform will bring together several treatment and monitoring modalities on a conformal flexible substrate to revolutionize the treatment of chronic wounds.
[ENG/EFRI FY 2012 Awards Announcement]

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A Biaxial Stretchable Interconnect With Liquid-alloy-covered Joints on Elastomeric Substrate
H. Kim, T. Maleki, and B. Ziaie
This paper reports a biaxial stretchable interconnect on an elastomeric substrate. To increase the stretchability of interconnects, a 2-D diamond-shaped geometry of gold on a polydimethylsiloxane substrate was adopted in which the potentially breakable points were covered with room temperature liquid alloy. Finite element model simulations were performed to identify the most vulnerable points subjected to stress concentration and optimize the design process. Simulations also indicated an optimum gold thickness and linewidth that result in a minimum stress when the substrate is stretched. Four different geometries were designed, fabricated, and characterized. These included: 1) 2-D diamond-shaped gold lines connected at circular junctions with an intersection angle of 90deg; 2) 2-D diamond-shaped gold lines connected at circular junctions with intersection angles of 120deg and 60deg; 3) 2-D diamond-shaped gold lines separated at circular junctions with an intersection angle of 90deg; and 4) 2-D diamond-shaped gold lines separated at circular junctions with intersection angles of 120 deg and 60deg. A maximum stretchability (DeltaL/L) of ~ 60% was achieved for the design in which the lines and circles were separated and had intersection angles of 120deg and 60deg. A resistance variation of (DeltaR/R) ~ 30% was measured for this configuration.