Ciencias Exactas y Ciencias de la Salud
Permanent URI for this collectionhttps://hdl.handle.net/11285/551039
Pertenecen a esta colección Tesis y Trabajos de grado de las Maestrías correspondientes a las Escuelas de Ingeniería y Ciencias así como a Medicina y Ciencias de la Salud.
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- Search for High-Molecular Weight Linear Polymers for the Formulation of Novel Solutions for the Fabrication of Micro-Fibers by Electromechanical Spinning(Instituto Tecnológico y de Estudios Superiores de Monterrey, 2020-12-02) Katagiri Tanaka, Antonio Osamu; AGUIRRE SOTO, HECTOR ALAN; 322598; Aguirre Soto, Héctor Alán; tolmquevedo, emipsanchez; Bonilla Ríos, Jaime; School of Engineering and Sciences; Campus Estado de México; Medina Medina, Dora IlianaCarbon nano-wires are versatile structures composed of carbon chains with a wide range of applications due to their high chemical resistance and electric properties. Regardless of the high interest in the implementation of carbon nano-wires in energy, environmental and health-care applications, no feasible processes have been developed to fabricate carbon nano-wires with spatial control at a reasonable cost. Carbon nano-wires have been fabricated with the use of a photoresist, but little is known about polymers that can produce conductive carbon nano-wires after pyrolysis. Various polymer solutions have been tested in near field electrospinning (NFES) and photopolymerization separately, however, few have been tested for nano-wire fabrication purposes through the process of spatio-temporal deposition with NFES, photo-polymerization for cross-linking and pyrolysis. The intention behind the thesis proposal is to use rheological analyses of different polymer solutions to determine if they can be easily electrospun at low voltages and then fabricate nano-wires with them. This thesis work arises from the need to test a greater variety of polymer-solvent combinations with the goal of designing a polymer solution to fabricate carbon nano-wires with higher conductivity than the current SU-8 polymeric nano-fibers. The present work includes the design of polymer solutions that can be electrospun, with the hope that the selected high molecular weight polymers can be photo-polymerized, and then pyrolyzed into conducting carbon nanowires. The overarching goal is to contribute towards the development of novel designed polymer solutions to achieve mass scale manufacturing of conductive carbon nano-wires in an inexpensive, continuous, simple and reproducible manner as central components for nano-sensors.
- Carbon derived from biomass: a precursor-based approach towards enhanced carbon surface chemistry(Instituto Tecnológico y de Estudios Superiores de Monterrey, 2020-11-25) Fredin Ortiz, Julio; Pérez González, Victor H.; tolmquevedo; Martínez Chapa, Sergio O.; Rodríguez Macías, Fernando J.; School of Engineering and Sciences; Campus MonterreyThe present thesis describes a systematic effort to synthesize, through pyrolysis, carbonaceous materials derived from readily available biomass, specifically, lyophilized fruit, dog hair and porcine blood. The characterization procedures and the search for suitable engineering applications, from separation to electrochemical sensing and energy storage are also discussed in this text. All samples with the exception of the canine hair were analyzed through scanning electron microscopy. Blood samples underwent elemental analysis, Fourier-transform infrared spectroscopy and powder x-ray diffractography and the dog hair samples underwent preparation as electrodes and evaluation through cyclic voltammetry and Electrochemical Impedance Spectroscopy. While the circumstances of the 2020 COVID-19 pandemic limit the scope of the results, preliminary work points towards two major insights. First, the applicability of the biomass derived carbon towards filtration systems due to its richness of oxygen groups. Second, the necessity of a secondary activation or annealing process for their potential energy related applications.