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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- Metamaterial-enhanced soft pneumatic actuators: tailoring stiffness and deformation modes(Instituto Tecnológico y de Estudios Superiores de Monterrey, 2025-06-09) Ochoa Sánchez, Oscar; González de Alba, Alejandro; emipsanchez; Cuan Urquizo, Enrique; Pérez Santiago, Rogelio; School of Engineering and Sciences; Campus Monterrey; Sandoval Castro, Xochitl YamileSoft robotics is redefining robotic systems by leveraging compliant materials, with soft actuators serving as key enablers of motion and functionality. Despite current strategies for designing soft pneumatic actuators, challenges remain in achieving tunable stiffness and deformation, limiting their versatility and reusability. This thesis explores a novel approach: integrating metamaterials as structural reinforcements to enable programmable deformation modes and localized stiffness control. To achieve this, functionally graded metamaterial beams are designed through a novel inverse method and incorporated into bending actuators. The study systematically evaluates the fabrication of reconfigurable actuators, the impact of varied reinforcements on stiffness and deformation, a constant curvature-based forward kinematic model, and an application case of a gripper capable of handling objects of different sizes and shapes. Additionally, metamaterial reinforcements are applied to origami-inspired contraction actuators, facilitating programmable motion for applications such as parallel platforms and robotic arms. By combining experimental, computational, and analytical methods, this research validates a novel strategy for the development of tunable soft actuators. The results demonstrate the ability to alter conventional deformation patterns, enabling unexpected capabilities such as inducing torsion in bending actuators and bending in contraction actuators. This work underscores the transformative potential of metamaterials in advancing reconfigurable and programmable soft actuators with tailored mechanical properties, paving the way for complex, real-world applications.
- 3D printed emitters for nanofibers production using VAT photopolymerization(Instituto Tecnológico y de Estudios Superiores de Monterrey, 2023-06-16) Almanza Vázquez, Luis Enrique; García López, Erika; dnbsrp; Rodríguez Gónzalez, Ciro Ángel; School of Engineering and Science; Campus Monterrey; Tejeda Alejandre, RaquelElectrospinning is a method centered on electrostatic forces for fabricating continuous nanofibers with a substantial active surface area per mass unit in which the morphology of electro spun nanofiber is influenced by some parameters such as voltage, space electric field distribution, surface charge density, liquid supply rate, solution surface tension, viscosity, conductivity, and humidity. This technique is being applied by designing a Multiplexed Source using VAT photopolymerization which will allow to produce the nanofibers. Several test probes varying geometrically (Hexagonal, Pentagonal, Quadrangular, Triangular and Circular) were designed to analyze the resolution of the EnvisionTEC and to observe if the multiplexed source geometry nozzles should be changed or remain the same. After an Error Data Analysis, it was concluded that the circular geometry was the one to work with because it does not get clogged by the time the experiments were computed thus because it does not have any angle or angles that affects its manufacturing in comparison with the other geometries. In this study the polymer used to produce the nanofibers was polyethylene oxide (PEO) with a molecular wight of 900,000 gr/mol. The electrospinning experiments were conducted at flow rates ranging from 0.1 and 1 ml / hr and working distances between 12.5 and 16.5 cm. The voltage remains constant at the value of 20kV. The collected fibers were analyzed using Scanning Electron Microscopy (SEM). Based on the solution and processing conditions, different structures from droplets, and heavily beaded fibers to defect-free mats were obtained. PEO’s concentration was 4% w/v and the volume of Deionized water was 96 ml. The solution was diluted and prepared by using a water bath for 8 hours until the PEO is completely diluted. Based on the solution and processing conditions, different structures from droplets, and heavily beaded fibers to defect-free mats were obtained and measured their diameter (if applicable) by using the image j software and by computing a Data analysis of the average diameter per sample of nanofibers check out which one is the optimal combination of parameters by producing the nanofibers. The final application of this is the manufacture of a multilayer patch for a biomedical application that is the tissue regeneration for second degree burning wounds.