Browsing by Author "Moreno, Salvador"
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Item Collagen Films as Substrates for Flexible Electronics(2019-04-24) Moreno, Salvador; Minary, MajidWith fast progress in the field of implantable electronics, pushing towards an integration of technology with humans, the biocompatibility of these electronics is a key issue. Collagen, one of the most abundant proteins in mammalian tissues, is a well-known biomaterial used in tissue engineering and bone scaffolds. Our preliminary studies showed that collagen could be used as a substrate for flexible electronics made using with E-Beam (electron beam) deposition by shadow mask. This allows you to make passive sensors with electrodes such as temperature sensors and strain sensors as well as active devices such as antennas and heaters. However, in order to make more advanced electronic devices, manufacturing strategies need to be developed in order to overcome limitations of collagen for these applications, namely processing temperature and mechanical stability in water. Transfer printing of electronics is one such strategy, using sacrificial layers of plastics, which also have their own temperature limitations. Germanium oxide is presented in this dissertation as novel water based sacrificial layer, which is amenable to high temperature processes such as the annealing and doping of Zinc Oxide (ZnO) via Pulse Laser Deposition (PLD). A number of devices presented in this dissertation include capacitors, transistors, and an integrated inverter transistor circuit. After etching in water overnight, devices made on wafers are lifted off and transferred to collagen films. By using crosslinkers, devices built on collagen films can be programmatically enhanced to resist enzymatic digestion. Cross-linked collagen was shown to have enhanced mechanical and thermal properties Encapsulated integrated electrical devices transferred onto collagen were shown to have minimal effects on cell viability on assays on MC3T3 osteoblast and A549 epithelial cells. Together, this dissertation demonstrates a manufacturing strategy of developing biocompatible integrated electrical devices on collagen.Item Multi-Physics Simulation of Metal Printing at Micro/Nanoscale Using Meniscus-Confined Electrodeposition: Effect of Nozzle Speed and Diameter(American Institute of Physics Inc, 2018-08-31) Morsali, Seyedreza; Daryadel, Soheil; Zhou, Zhong; Behroozfar, Ali; Baniasadi, Mahmoud; Moreno, Salvador; Qian, Dong; Minary-Jolandan, Majid; Morsali, Seyedreza; Daryadel, Soheil; Zhou, Zhong; Behroozfar, Ali; Baniasadi, Mahmoud; Moreno, Salvador; Qian, Dong; Minary-Jolandan, MajidMeniscus-confined electrodeposition (MCED) is a solution-based, room temperature process for 3D printing of metals at micro/nanoscale. In this process, a meniscus (liquid bridge or capillary) between a nozzle and a substrate governs the localized electrodeposition process, which involves multiple physics of electrodeposition, fluid dynamics, mass, and heat transfer. We have developed a multiphysics finite element (FE) model to investigate the effects of nozzle speed (v N) and nozzle diameter (D0) in the MCED process. The simulation results are validated with experimental data. Based on theoretical approach and experimental observation, the diameter of the deposited wire is in the range of 0.5-0.9 times of the nozzle diameter. The applicable range for vN for various nozzle diameters is computed. The results showed that the contribution of migration flux to total flux remains nearly constant (∼50%) for all values of pipette diameter in the range examined (100 nm-5 μm), whereas the contribution of diffusion and evaporation fluxes to total flux increase and decrease with the increasing pipette diameter, respectively. Results of this multiphysics study can be used to guide the experiment for optimal process conditions. © 2017 Author(s).Item Student Haiku Competition entries for 2015(Eugene McDermott Library, 2015-04) Ahmed, Rahat; Alaggio, Nicholas; Bates, Kristen Kelly; Benakatti, Poonam; Betz, Dene; Campo, Ian; Charba, Bernadette Marie; Correa, Raquel; Echols, Brittany Elaine; Hartke, Samantha; Hayes, Nathan; John, Andrew; Kollasch, Dominic Gerald; Luu, Kha; Ma, Wenhao; Mangipudi, Vivek V. L.; Marciano, Bianca; Mendonca, Adam; Moreno, Salvador; Nguyen, Henry Quang; Obonna, Shanice; Ramirez-Paredes, Juan Pablo; Ross, Casey; Rozhdestvenska, Kateryna; Samuel, Anthony; Savelle, Charles; Schuler, Anthony; Soomro, Amna; Sreedharan, Dheepak; Su, Shan; Thanulingam, Venkatesan; Twine, Kasey; Vakil, Haris; Varnell, Shelbi; Vettimattam, Joel; Victor, Vandhana Fredy; Ward, Lindsey; Zhang, Yirong; Eugene McDermott Library. Reference Services