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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- Manufacturability of PLA parts reinforced with TiO2 nanoparticles by ultrasonic molding.(Instituto Tecnológico y de Estudios Superiores de Monterrey, 2020-06-16) Macías Naranjo, Mariana; VAZQUEZ LEPE, ELISA VIRGINIA; 268852; Vázquez Lepe, Elisa Virginia; mla, emipsanchez; Ortega Lara, Wendy de Lourdes; Rodríguez González, Ciro Angel; School of Engineering and Sciences; Campus Monterrey; Ferrer Real, InésThe objective of the thesis is to define and to validate a methodology for the stabilization of process parameters in ultrasonic molding and to analyze the manufacturability of PLA parts reinforced with TiO2 nanoparticles in the ultrasonic molding process. Ultrasonic molding is a new technology used for micro-part molding, reducing the necessary energy, process times, and material waste. Validating a methodology for this process, PLA was processed with TiO2 nanoparticles to observe the response of the process in this combination of materials. In addition, to observe the influence of the concentration of nanoparticles by performing the characterization to find an application in the medical sector in the future.
- Design, simulation and application of a PCL membrane with TiO2 and Ag nanoparticles for a novel geometry fog water harvesting device(Instituto Tecnológico y de Estudios Superiores de Monterrey) Borbolla Torres, César Iván; Zúñiga, Alex Elías; Martínez Romero, Oscar; School of Engineering and Sciences; School of Engineering and Sciences; Campus Monterrey; Del Ángel Sánchez, KarinaNowadays, the world faces an increasing water crisis problem that will become even more severe in the years to come. Fog-water harvesting represents an economical and efficient alternative to address water scarcity around the world. In this study a report on the development of Polycaprolactone (PCL) composite membranes using TiO2 nanoparticles (NPs), Ag NPs and Ag-TiO2 NPs is presented, besides the effect of using two different solvents, acetic acid and a mixture of chloroform and N,N-dimethylformamide (DMF), to achieve a hydrophobic material capable of assisting fog-water harvesting applications. The proposal of a novel geometry is presented validated through mechanical and air-flow simulation. Beside the investigation and development of a new manufacture procedure for the application of the composite polymer material on a commercial Rashel mesh to enhance its properties. Surface morphology and roughness were explored by scanning electron and infinity focus microscopy, a more homogeneous morphology was observed for composites elaborated with chloroform-DMF. The degree of crystallinity and structural properties were investigated by differential scanning calorimetry and x-ray diffraction. The interaction between PCL and the dopants NPs was studied by Fourier transform infrared spectroscopy, detecting a shift to lower wavenumbers in the principal polymer modes corroborating a compatibility between the solvents, the NPs and the PCL polymer matrix. The permeability of the membranes was analyzed by water contact angle and the mechanical performance was investigated by using a uniaxial quasi-static test and equibiaxial cyclic test. The results obtained show an improvement in such properties for the composites elaborated with chloroform-DMF. Air-flow simulation shows a smoother flux and focused condensation on the pores´ edges. Finite element analysis showed an increase on the mechanical stability of the mesh when the geometry is changed. The geometry proposed enhances water collection against planar profiles. Values obtained in the fog-water collection efficiency tests demonstrate the feasibility and the potential of the composite material developed whit the highest value of 5 l/m2/hr. achieved. This research is relevant to set the experimental parameters and the application procedure to manufacture a high collection efficiency fog-water harvesting device based on a PCL.