Now showing 1 - 8 of 8
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    Item type:Publication,
    Study on the ultimate tensile stress and fatigue life in recycled PLA printed by FDM with different percentages of relative humidity
    (2025)
    S. L. Rodríguez-Reyna
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    Fausto Ledezma-Mondragón
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    J. H. Díaz-Aguilera
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    Item type:Publication,
    Optimization of the mechanical behavior of ABS and PLA 3D printed using heat treatments
    (Springer Science and Business Media LLC, 2025-03-17)
    S. L. Rodríguez-Reyna
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    J. H. Díaz-Aguilera
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    Vladimir Escobar-Barrios
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    Item type:Publication,
    Mass Flow Control Strategy for Maximum Energy Extraction in Thermal Energy Storage Tanks
    (ASME International, 2024-11-28)
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    <jats:title>Abstract</jats:title> <jats:p>This paper introduces an experimental approach to enhance thermal energy storage (TES) tank performance by employing a novel control strategy and an automatic flow valve. The valve adjusts mass flow to minimize heat loss and maximize useful heat within a specified input–output temperature range. Experiments were conducted indoors, simulating input heat via an electric heating element, and adhering to ANSI/ASHRAE 93-2010 standards. In the proposed control strategy, the set point is self-regulated based on an input value which in this case is the heat introduced into the TES system. In this way, when there is more input heat available, the mass flow will increase to obtain more useful heat at the output and, on the contrary, when there is less heat available, the mass flow will be reduced to obtain greater exergy. A comparison between this strategy and conventional on–off control systems was conducted, evaluating their performance based on useful heat obtained over an 8-h period with varying input heat levels. Results demonstrate that the proposed flow control methodology consistently outperforms on–off control, achieving a maximum 13.56% increase in useful heat under optimal conditions. This underscores the effectiveness of the novel control strategy in maximizing thermal energy storage tank efficiency.</jats:p>
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    Effect of 3D printing by fused deposition modelling on the microstructural and macrostructural properties of acrylonitrile butadiene styrene, polylactic acid and polyamide 12
    (SAGE Publications, 2025-09-16)
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    J.A. Guerrero de León
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    Jorge H. Díaz A.
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    S.L. Rodríguez-Reyna
    The objective of this research was to find a relationship between the microstructural and macrostructural properties of polylactic acid, acrylonitrile butadiene styrene and polyamide 12 (PA12) when processed using fused deposition modelling. The crystallinity, enthalpy of crystallization (ΔHc), glass transition temperature (Tg) and Young's modulus (E) were evaluated. The results showed that crystallinity increased for all materials after the 3D printing process, leading to an increase in ΔHcand a decrease in Tg, particularly in PA12. This variation in microstructural properties resulted in a significant decrease in Young's modulus, indicating a reduction in the stiffness of the printed materials. The research suggests that an increase in crystalline material volume, resulting from polymer chain rearrangement during 3D printing, reduces the energy required for thermal softening and decreases the material's rigidity. © The Author(s) 2025
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    Design and optimization methodology for different 3D processed materials (PLA, ABS and carbon fiber reinforced nylon PA12) subjected to static and dynamic loads
    (2024)
    S.L. Rodríguez-Reyna
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    J.H. Díaz-Aguilera
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    Ch J. García
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    Emmanuel J. Gutierrez-Castañeda
    Scopus© Citations 4  21
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    Item type:Publication,
    Development and Characterization of a Biodegradable PLA Food Packaging Hold Monoterpene–Cyclodextrin Complexes against Alternaria alternata
    (2019)
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    Nuño-Donlucas Sergio Manuel
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    Núñez-Delicado Estrella
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    Gabaldón José Antonio
    <jats:p>The fungi of the genus Alternaria are among the main pathogens causing post-harvest diseases and significant economic losses. The consumption of Alternaria contaminated foods may be a major risk to human health, as many Alternaria species produce several toxic mycotoxins and secondary metabolites. To protect consumer health and extend the shelf life of food products, the development of new ways of packaging is of outmost importance. The aim of this work was to investigate the antifungal capacity of a biodegradable poly(lactic acid) (PLA) package filled with thymol or carvacrol complexed in β-cyclodextrins (β-CDs) by the solubility method. Once solid complexes were obtained by spray drying, varying proportions (0.0%, 1.5%, 2.5%, and 5.0 wt%) of β-CD–thymol or β-CD–carvacrol were mixed with PLA for packaging development by injection process. The formation of stable complexes between β-CDs and carvacrol or thymol molecules was assessed by Fourier-transform infrared spectroscopy (FTIR). Mechanical, structural, and thermal characterization of the developed packaging was also carried out. The polymer surface showed a decrease in the number of cuts and folds as the amount of encapsulation increased, thereby reducing the stiffness of the packaging. In addition, thermogravimetric analysis (TGA) revealed a slight decrease in the temperature of degradation of PLA package as the concentration of the complexes increased, with β-CD–carvacrol or β-CDs–thymol complexes acting as plasticisers that lowered the intermolecular forces of the polymer chains, thereby improving the breaking point. Packages containing 2.5% and 5% β-CD–carvacrol, or 5% β-CD–thymol showed Alternaria alternata inhibition after 10 days of incubation revealing their potential uses in agrofood industry.</jats:p>
    Scopus© Citations 48  53  1
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      23  2
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    Item type:Patent,
    Tapete receptor de residuos en mingitorios
    (IMPI)
    Villa López, Jose Luis
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    La presente invención se refiere a un dispositivo, para baños públicos o privados, que capte los orines residuales que caen a nivel del suelo del mingitorio de pared, es un apoyo para mantener limpios los baños en el área de sanitización. Consiste en un captador de pequeñas cantidades de orina que no caen en el mingitorio y un núcleo absorbente de los mismos, que gracias a su disposición logra captar una mayor cantidad de líquidos, y evitar a su vez la salida de malos olores, además de ser fácil en su uso, ya que al estar conformado por cartuchos reemplazables e intercambiables es más sencilla y rápida su limpieza.
      43  1