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C. Rodriguez
Department of Mechanical Engineering and Advanced Materials School of Engineering and Science Tecnológico de Monterrey Monterrey Mexico

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Guest editorial
Published: 16 December 2020 in Advanced Healthcare Materials
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ACS Style

Ciro A. Rodriguez; David Dean. Biofabrication 2019: Special Issue of Selected Papers from the Annual Meeting of the International Society for Biofabrication. Advanced Healthcare Materials 2020, 9, e2002049 .

AMA Style

Ciro A. Rodriguez, David Dean. Biofabrication 2019: Special Issue of Selected Papers from the Annual Meeting of the International Society for Biofabrication. Advanced Healthcare Materials. 2020; 9 (24):e2002049.

Chicago/Turabian Style

Ciro A. Rodriguez; David Dean. 2020. "Biofabrication 2019: Special Issue of Selected Papers from the Annual Meeting of the International Society for Biofabrication." Advanced Healthcare Materials 9, no. 24: e2002049.

Journal article
Published: 04 December 2020 in Sensors
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Laparoscopic surgery demands highly skilled surgeons. Traditionally, a surgeon’s knowledge is acquired by operating under a mentor-trainee method. In recent years, laparoscopic simulators have gained ground as tools in skill acquisition. Despite the wide range of laparoscopic simulators available, few provide objective feedback to the trainee. Those systems with quantitative feedback tend to be high-end solutions with limited availability due to cost. A modular smart trainer was developed, combining tool-tracking and force-using employing commercially available sensors. Additionally, a force training system based on polydimethylsiloxane (PDMS) phantoms for sample stiffness differentiation is presented. This prototype was tested with 39 subjects, between novices (13), intermediates (13), and experts (13), evaluating execution differences among groups in training exercises. The estimated cost is USD $200 (components only), not including laparoscopic instruments. The motion system was tested for noise reduction and position validation with a mean error of 0.94 mm. Grasping force approximation showed a correlation of 0.9975. Furthermore, differences in phantoms stiffness effectively reflected user manipulation. Subject groups showed significant differences in execution time, accumulated distance, and mean and maximum applied grasping force. Accurate information was obtained regarding motion and force. The developed force-sensing tool can easily be transferred to a clinical setting. Further work will consist on a validation of the simulator on a wider range of tasks and a larger sample of volunteers.

ACS Style

Luis H. Olivas-Alanis; Ricardo A. Calzada-Briseño; Victor Segura-Ibarra; Elisa V. Vázquez; Jose A. Diaz-Elizondo; Eduardo Flores-Villalba; Ciro A. Rodriguez. LAPKaans: Tool-Motion Tracking and Gripping Force-Sensing Modular Smart Laparoscopic Training System. Sensors 2020, 20, 6937 .

AMA Style

Luis H. Olivas-Alanis, Ricardo A. Calzada-Briseño, Victor Segura-Ibarra, Elisa V. Vázquez, Jose A. Diaz-Elizondo, Eduardo Flores-Villalba, Ciro A. Rodriguez. LAPKaans: Tool-Motion Tracking and Gripping Force-Sensing Modular Smart Laparoscopic Training System. Sensors. 2020; 20 (23):6937.

Chicago/Turabian Style

Luis H. Olivas-Alanis; Ricardo A. Calzada-Briseño; Victor Segura-Ibarra; Elisa V. Vázquez; Jose A. Diaz-Elizondo; Eduardo Flores-Villalba; Ciro A. Rodriguez. 2020. "LAPKaans: Tool-Motion Tracking and Gripping Force-Sensing Modular Smart Laparoscopic Training System." Sensors 20, no. 23: 6937.

Journal article
Published: 17 November 2020 in Materials
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The interplay between a prosthetic and tissue represents an important factor for the fixation of orthopedic implants. Laser texturing tests and electropolishing were performed on two materials used in the fabrication of medical devices, i.e., CoCr and Ti6Al4V-ELI alloys. The material surface was textured with a diode-pumped solid state (DPSS) laser and its effect on the surface quality and material modification, under different combinations of laser power and marking speed, were investigated. Our results indicate that an increment of energy per unit length causes an incremental trend in surface roughness parameters. Additionally, phase transformation on the surface of both alloys was achieved. Chemical analysis by energy dispersive X-ray spectrometer (EDX) shows the formation of (Co(Cr,Mo)) phase and the M23C6 precipitate on the CoCr surface; while quantitative analysis of the X-ray diffractometer (XRD) results demonstrates the oxidation of the Ti alloy with the formation of Ti2O and Ti6O from the reduction of the α-Ti phase. The behaviors were both related with an increase of the energy per unit length. Control of the final surface roughness was achieved by an electropolishing post-treatment, minimizing the as-treated values. After polishing, a reduction of surface roughness parameters was obtained in a range between 3% and 44%, while no changes in chemical composition or present phases were observed.

ACS Style

Jesús A. Sandoval-Robles; Ciro A. Rodríguez; Erika García-López. Laser Surface Texturing and Electropolishing of CoCr and Ti6Al4V-ELI Alloys for Biomedical Applications. Materials 2020, 13, 5203 .

AMA Style

Jesús A. Sandoval-Robles, Ciro A. Rodríguez, Erika García-López. Laser Surface Texturing and Electropolishing of CoCr and Ti6Al4V-ELI Alloys for Biomedical Applications. Materials. 2020; 13 (22):5203.

Chicago/Turabian Style

Jesús A. Sandoval-Robles; Ciro A. Rodríguez; Erika García-López. 2020. "Laser Surface Texturing and Electropolishing of CoCr and Ti6Al4V-ELI Alloys for Biomedical Applications." Materials 13, no. 22: 5203.

Journal article
Published: 02 November 2020 in Applied Sciences
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Circular Economy (CE) models are increasingly referenced in international fora and on many countries’ climate action agendas. This emphasis is associated with the international environmental and climate crisis. The case of the electronics industry remains particularly relevant, given its background in the use of CE models and its potential to enhance their use. This work focuses on consumer behavior regarding electronics products in Mexico. This is a largely under-researched topic not only in Mexico but also in Latin America. This study demonstrates that, by trying to extend the lifespan of their electronic products, consumers have awareness of product circularity. However, there is a lack of incentives to capitalize on this consumer interest, compounded by the limited participation of manufacturers and distributors. It is concluded that with a well-designed public policy, the electronics industry (including the mobile phone sector) in Mexico can move toward a CE model more rapidly. A stronger initiative for CE by design should be part of these policies, not only in Mexico but also internationally. The role of better eco-labelling in promoting consumers’ environmental awareness is essential. The lessons of this case study might be of interest to other countries as well.

ACS Style

Daniela Cordova-Pizarro; Ismael Aguilar-Barajas; Ciro A. Rodriguez; David Romero. Circular Economy in Mexico’s Electronic and Cell Phone Industry: Recent Evidence of Consumer Behavior. Applied Sciences 2020, 10, 7744 .

AMA Style

Daniela Cordova-Pizarro, Ismael Aguilar-Barajas, Ciro A. Rodriguez, David Romero. Circular Economy in Mexico’s Electronic and Cell Phone Industry: Recent Evidence of Consumer Behavior. Applied Sciences. 2020; 10 (21):7744.

Chicago/Turabian Style

Daniela Cordova-Pizarro; Ismael Aguilar-Barajas; Ciro A. Rodriguez; David Romero. 2020. "Circular Economy in Mexico’s Electronic and Cell Phone Industry: Recent Evidence of Consumer Behavior." Applied Sciences 10, no. 21: 7744.

Journal article
Published: 29 October 2020 in Micromachines
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In this paper, we characterized an assortment of photopolymers and stereolithography processes to produce 3D-printed molds and polydimethylsiloxane (PDMS) castings of micromixing devices. Once materials and processes were screened, the validation of the soft tooling approach in microfluidic devices was carried out through a case study. An asymmetric split-and-recombine device with different cross-sections was manufactured and tested under different regime conditions (10 < Re < 70). Mixing performances between 3% and 96% were obtained depending on the flow regime and the pitch-to-depth ratio. The study shows that 3D-printed soft tooling can provide other benefits such as multiple cross-sections and other potential layouts on a single mold.

ACS Style

J. Israel Martínez-López; Héctor Andrés Betancourt Cervantes; Luis Donaldo Cuevas Iturbe; Elisa Vázquez; Edisson A. Naula; Alejandro Martínez López; Héctor R. Siller; Christian Mendoza-Buenrostro; Ciro A. Rodríguez. Characterization of Soft Tooling Photopolymers and Processes for Micromixing Devices with Variable Cross-Section. Micromachines 2020, 11, 970 .

AMA Style

J. Israel Martínez-López, Héctor Andrés Betancourt Cervantes, Luis Donaldo Cuevas Iturbe, Elisa Vázquez, Edisson A. Naula, Alejandro Martínez López, Héctor R. Siller, Christian Mendoza-Buenrostro, Ciro A. Rodríguez. Characterization of Soft Tooling Photopolymers and Processes for Micromixing Devices with Variable Cross-Section. Micromachines. 2020; 11 (11):970.

Chicago/Turabian Style

J. Israel Martínez-López; Héctor Andrés Betancourt Cervantes; Luis Donaldo Cuevas Iturbe; Elisa Vázquez; Edisson A. Naula; Alejandro Martínez López; Héctor R. Siller; Christian Mendoza-Buenrostro; Ciro A. Rodríguez. 2020. "Characterization of Soft Tooling Photopolymers and Processes for Micromixing Devices with Variable Cross-Section." Micromachines 11, no. 11: 970.

Journal article
Published: 30 June 2020 in Materials
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The use of hybrid manufacturing to produce bimodal scaffolds has represented a great advancement in tissue engineering. These scaffolds provide a favorable environment in which cells can adhere and produce new tissue. However, there are several areas of opportunity to manufacture structures that provide enough strength and rigidity, while also improving chemical integrity. As an advancement in the manufacturing process of scaffolds, a cooling system was introduced in a fused deposition modeling (FDM) machine to vary the temperature on the printing bed. Two groups of polylactic acid (PLA) scaffolds were then printed at two different bed temperatures. The rate of degradation was evaluated during eight weeks in Hank’s Balanced Salt Solution (HBSS) in a controlled environment (37 °C–120 rpm) to assess crystallinity. Results showed the influence of the cooling system on the degradation rate of printed scaffolds after the immersion period. This phenomenon was attributable to the mechanism associated with alkaline hydrolysis, where a higher degree of crystallinity obtained in one group induced greater rates of mass loss. The overall crystallinity was observed, through differential scanning calorimetry (DSC), thermo gravimetric analysis (TGA), and Fourier transformed infrared spectroscopy (FTIR) analysis, to increase with time because of the erosion of some amorphous parts after immersion.

ACS Style

Javier Vazquez-Armendariz; Raquel Tejeda-Alejandre; Aida Rodriguez-Garcia; Yadira I. Vega-Cantu; Christian Mendoza-Buenrostro; Ciro A. Rodriguez. Influence of Controlled Cooling on Crystallinity of Poly (L–Lactic Acid) Scaffolds after Hydrolytic Degradation. Materials 2020, 13, 2943 .

AMA Style

Javier Vazquez-Armendariz, Raquel Tejeda-Alejandre, Aida Rodriguez-Garcia, Yadira I. Vega-Cantu, Christian Mendoza-Buenrostro, Ciro A. Rodriguez. Influence of Controlled Cooling on Crystallinity of Poly (L–Lactic Acid) Scaffolds after Hydrolytic Degradation. Materials. 2020; 13 (13):2943.

Chicago/Turabian Style

Javier Vazquez-Armendariz; Raquel Tejeda-Alejandre; Aida Rodriguez-Garcia; Yadira I. Vega-Cantu; Christian Mendoza-Buenrostro; Ciro A. Rodriguez. 2020. "Influence of Controlled Cooling on Crystallinity of Poly (L–Lactic Acid) Scaffolds after Hydrolytic Degradation." Materials 13, no. 13: 2943.

Journal article
Published: 12 June 2020 in Biofabrication
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This paper introduces the concept of continuous chaotic printing, i.e., the use of chaotic flows for deterministic and continuous extrusion of fibers with internal multilayered micro- or nanostructures. Two free-flowing materials are coextruded through a printhead containing a miniaturized Kenics static mixer (KSM) composed of multiple helicoidal elements. This produces a fiber with a well-defined internal multilayer microarchitecture at high-throughput (>1.0 m min-1). The number of mixing elements and the printhead diameter determine the number and thickness of the internal lamellae, which are generated according to successive bifurcations that yield a vast amount of inter-material surface area (~102cm2cm-3) at high resolution (~10 µm). This creates a new opportunity to produce structures with extremely high surface area to volume (SAV). Comparison of experimental and computational results demonstrates that continuous chaotic 3D printing is a robust process with predictable output. In an exciting new development, we demonstrate a method for scaling down these microstructures by 3 orders of magnitude, to the nanoscale level (~150 nm), by feeding the output of a continuous chaotic 3D printhead into an electrospinner. The simplicity and high resolution of continuous chaotic printing strongly supports its potential use in novel applications, including-but not limited to-bioprinting of multi-scale layered tissue structures such as bacterial communities, mammalian cell layers seeded with a single cell type in close proximity to a layer of another cell type, and fabrication of smart multi-material and multilayered constructs such as organoids.

ACS Style

Carolina Chávez-Madero; María Díaz De León-Derby; MohamadMahdi Samandari; Carlos Fernando Ceballos-González; Edna Bolívar; Christian Carlos Mendoza-Buenrostro; Sunshine Holmberg; Norma Alicia Garza-Flores; Mohammad Ali Almajhadi; Ivonne González-Gamboa; Juan Felipe Yee-De León; Sergio O. Martínez-Chapa; Ciro Angel Rodríguez; Hemantha Kumar Wickramasinghe; Marc J Madou; David Dean; Ali Khademhosseini; Yu Shrike Zhang; Mario Moisés Alvarez; Grissel Trujillo-De Santiago. Using chaotic advection for facile high-throughput fabrication of ordered multilayer micro- and nanostructures: continuous chaotic printing. Biofabrication 2020, 12, 035023 .

AMA Style

Carolina Chávez-Madero, María Díaz De León-Derby, MohamadMahdi Samandari, Carlos Fernando Ceballos-González, Edna Bolívar, Christian Carlos Mendoza-Buenrostro, Sunshine Holmberg, Norma Alicia Garza-Flores, Mohammad Ali Almajhadi, Ivonne González-Gamboa, Juan Felipe Yee-De León, Sergio O. Martínez-Chapa, Ciro Angel Rodríguez, Hemantha Kumar Wickramasinghe, Marc J Madou, David Dean, Ali Khademhosseini, Yu Shrike Zhang, Mario Moisés Alvarez, Grissel Trujillo-De Santiago. Using chaotic advection for facile high-throughput fabrication of ordered multilayer micro- and nanostructures: continuous chaotic printing. Biofabrication. 2020; 12 (3):035023.

Chicago/Turabian Style

Carolina Chávez-Madero; María Díaz De León-Derby; MohamadMahdi Samandari; Carlos Fernando Ceballos-González; Edna Bolívar; Christian Carlos Mendoza-Buenrostro; Sunshine Holmberg; Norma Alicia Garza-Flores; Mohammad Ali Almajhadi; Ivonne González-Gamboa; Juan Felipe Yee-De León; Sergio O. Martínez-Chapa; Ciro Angel Rodríguez; Hemantha Kumar Wickramasinghe; Marc J Madou; David Dean; Ali Khademhosseini; Yu Shrike Zhang; Mario Moisés Alvarez; Grissel Trujillo-De Santiago. 2020. "Using chaotic advection for facile high-throughput fabrication of ordered multilayer micro- and nanostructures: continuous chaotic printing." Biofabrication 12, no. 3: 035023.

Chapter
Published: 05 May 2020 in Southern Space Studies
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A three-dimensional Finite Element Model has been developed in order to predict the optimum processing parameters during the laser melting of an AA6061 feedstock using the Additive Manufacturing (AM) process Selective Laser Melting (SLM) for the manufacturing of the CIIIASaT’s structure. The presented model computes the heat flow characteristics in three dimensions of the SLM process as well as the melt pool geometry formed during the process. The model considers the phase transformations and physical phenomena present during the SLM of AA6061 in order to predict the thermal gradients present during the process. The developed model was capable of predicting the melt pool size (with an error between 16 and 6% for different samples). Porosity of the manufactured samples was measured as an additional information and for future reference. SLM technologies demonstrated to be capable of producing AA6061 structures for their usage in Cubesats.

ACS Style

Malena Ley-Bun-Leal; Marlom Arturo Gamboa-Aispuro; Patricia Del Carmen Zambrano-Robledo; Ciro Angel Rodriguez-Gonzalez; Omar Eduardo Lopez-Botello; Barbara Bermúdez-Reyes. CIIIASaT Structure Additive Manufacturing Design. Southern Space Studies 2020, 37 -54.

AMA Style

Malena Ley-Bun-Leal, Marlom Arturo Gamboa-Aispuro, Patricia Del Carmen Zambrano-Robledo, Ciro Angel Rodriguez-Gonzalez, Omar Eduardo Lopez-Botello, Barbara Bermúdez-Reyes. CIIIASaT Structure Additive Manufacturing Design. Southern Space Studies. 2020; ():37-54.

Chicago/Turabian Style

Malena Ley-Bun-Leal; Marlom Arturo Gamboa-Aispuro; Patricia Del Carmen Zambrano-Robledo; Ciro Angel Rodriguez-Gonzalez; Omar Eduardo Lopez-Botello; Barbara Bermúdez-Reyes. 2020. "CIIIASaT Structure Additive Manufacturing Design." Southern Space Studies , no. : 37-54.

Preprint
Published: 08 November 2019
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This paper introduces the concept of continuous chaotic printing, i.e., the use of chaotic flows for deterministic and continuous fabrication of fibers with internal multilayered micro-or nanostructures. Two free-flowing materials are coextruded through a printhead containing a miniaturized Kenics static mixer (KSM) composed of multiple helicoidal elements. This produces a fiber with a well-defined internal multilayer microarchitecture at high speeds (>1.0 m min-1). The number of mixing elements and the printhead diameter determine the number and thickness of the internal lamellae, which are generated according to successive bifurcations that yield a vast amount of inter-material surface area (~102 cm2 cm3) and high resolution features (~10 μm). In an exciting further development, we demonstrate a scale-down of the microstructure by 3 orders of magnitude, to the nanoscale level (~10 nm), by feeding the output of a continuous chaotic 3D printhead into an electrospinner. Comparison of experimental and computational results demonstrates the robust and predictable output and performance of continuous chaotic 3D printing. The simplicity and high resolution of continuous chaotic printing strongly supports its potential use in novel applications, including—but not limited to—bioprinting of multi-scale tissue-like structures, modeling of bacterial communities, and fabrication of smart multi-material and multilayered constructs.

ACS Style

Carolina Chavez-Madero; Maria Diaz De Leon-Derby; MohamadMahdi Samandari; Carlos Fernando Ceballos-Gonzalez; Edna Johana Bolivar-Monsalve; Christian Carlos Mendoza-Buenrostro; Sunshine Holmberg; Norma Alicia Garza-Flores; Mohammad Ali Almajhadi; Ivonne Gonzalez-Gamboa; Juan Felipe Yee-De Leon; Sergio Omar Martinez-Chapa; Ciro A. Rodriguez; Hemantha Kumar Wickramasinghe; Marc Madou; Ali Khademhosseini; Yu Shrike Zhang; Mario Moises Alvarez; Grissel Trujillo-De Santiago. Using Chaos for Facile High-throughput Fabrication of Ordered Multilayer Micro- and Nanostructures. 2019, 833772 .

AMA Style

Carolina Chavez-Madero, Maria Diaz De Leon-Derby, MohamadMahdi Samandari, Carlos Fernando Ceballos-Gonzalez, Edna Johana Bolivar-Monsalve, Christian Carlos Mendoza-Buenrostro, Sunshine Holmberg, Norma Alicia Garza-Flores, Mohammad Ali Almajhadi, Ivonne Gonzalez-Gamboa, Juan Felipe Yee-De Leon, Sergio Omar Martinez-Chapa, Ciro A. Rodriguez, Hemantha Kumar Wickramasinghe, Marc Madou, Ali Khademhosseini, Yu Shrike Zhang, Mario Moises Alvarez, Grissel Trujillo-De Santiago. Using Chaos for Facile High-throughput Fabrication of Ordered Multilayer Micro- and Nanostructures. . 2019; ():833772.

Chicago/Turabian Style

Carolina Chavez-Madero; Maria Diaz De Leon-Derby; MohamadMahdi Samandari; Carlos Fernando Ceballos-Gonzalez; Edna Johana Bolivar-Monsalve; Christian Carlos Mendoza-Buenrostro; Sunshine Holmberg; Norma Alicia Garza-Flores; Mohammad Ali Almajhadi; Ivonne Gonzalez-Gamboa; Juan Felipe Yee-De Leon; Sergio Omar Martinez-Chapa; Ciro A. Rodriguez; Hemantha Kumar Wickramasinghe; Marc Madou; Ali Khademhosseini; Yu Shrike Zhang; Mario Moises Alvarez; Grissel Trujillo-De Santiago. 2019. "Using Chaos for Facile High-throughput Fabrication of Ordered Multilayer Micro- and Nanostructures." , no. : 833772.

Journal article
Published: 31 October 2019 in Journal of Cleaner Production
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The exponential growth of additive manufacturing technologies is not only improving production processes to achieve functional requirements for products, but it could also help to minimize environmental impacts. In order to align a green product lifecycle management vision, companies need to implement emerging technologies and define a set of metrics that measure the benefits of the change. Each product requires a particular and optimized manufacturing process plan, and each production phase must achieve a significant reduction of critical metrics for the whole Life Cycle Assessment (LCA). This paper provides a comprehensive and comparative LCA of two manufacturing process plans for the case study of an aircraft engine turbine blade. The first process consists of a combination of Investment Casting and Precision Machining and the second consists in the replacement of Investment casting by Selective Laser Melting as an emergent process for near net shape fabrication. The collected data for the comparison includes Global Warming Potential (GWP), Acidification Potential (AP), Ozone layer Depletion Potential (ODP), Human Toxicity Potential (HTP), and Human Toxicity (HT) with cancer and non-cancer effects. The relative analysis shows that, for the critical indicators, an apparent improvement in CO2 emissions reduction is achieved as well as in the other hazardous emissions. The results showed that the whole lifecycle of Conventional Manufacturing corresponds to 7.32 tons of CO2, while, the emission of the Additive Manufacturing is 7.02 tons of CO2. The results analysis can be used for decision-making, and it can help for facing future comparative works to explore cleaner manufacturing technologies.

ACS Style

Sharon Torres-Carrillo; Héctor R. Siller; Carlos Vila; Cecilio López; Ciro A. Rodríguez. Environmental analysis of selective laser melting in the manufacturing of aeronautical turbine blades. Journal of Cleaner Production 2019, 246, 119068 .

AMA Style

Sharon Torres-Carrillo, Héctor R. Siller, Carlos Vila, Cecilio López, Ciro A. Rodríguez. Environmental analysis of selective laser melting in the manufacturing of aeronautical turbine blades. Journal of Cleaner Production. 2019; 246 ():119068.

Chicago/Turabian Style

Sharon Torres-Carrillo; Héctor R. Siller; Carlos Vila; Cecilio López; Ciro A. Rodríguez. 2019. "Environmental analysis of selective laser melting in the manufacturing of aeronautical turbine blades." Journal of Cleaner Production 246, no. : 119068.

Journal article
Published: 02 July 2019 in Materials
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Currently, electrospinning membranes for vascular graft applications has been limited, due to random fiber alignment, to use in mandrel-spun, straight tubular shapes. However, straight, circular tubes with constant diameters are rare in the body. This study presents a method to fabricate curved, non-circular, and bifurcated vascular grafts based on electrospinning. In order to create a system capable of electrospinning membranes to meet specific patient needs, this study focused on characterizing the influence of fiber source, electrical field collector position (inside vs. outside the mandrel), and the motion scheme of the mandrel (rotation vs. rotation and tilting) on the vascular graft membrane morphology and mechanical properties. Given the extensive use of poly(ε-caprolactone) (PCL) in tubular vascular graft membranes, the same material was used here to facilitate a comparison. Our results showed that the best morphology was obtained using orthogonal sources and collector positioning, and a well-timed rotation and tilting motion scheme. In terms of mechanical properties, our bifurcated vascular graft membranes showed burst pressure comparable to that of tubular vascular graft membranes previously reported, with values up to 5126 mmHg. However, the suture retention strength shown by the bifurcated vascular graft membranes was less than desired, not clinically viable values. Process improvements are being contemplated to introduce these devices into the clinical range.

ACS Style

Raquel Tejeda-Alejandre; Jan A. Lammel-Lindemann; Hernan Lara-Padilla; David Dean; Ciro A. Rodriguez. Influence of Electrical Field Collector Positioning and Motion Scheme on Electrospun Bifurcated Vascular Graft Membranes. Materials 2019, 12, 2123 .

AMA Style

Raquel Tejeda-Alejandre, Jan A. Lammel-Lindemann, Hernan Lara-Padilla, David Dean, Ciro A. Rodriguez. Influence of Electrical Field Collector Positioning and Motion Scheme on Electrospun Bifurcated Vascular Graft Membranes. Materials. 2019; 12 (13):2123.

Chicago/Turabian Style

Raquel Tejeda-Alejandre; Jan A. Lammel-Lindemann; Hernan Lara-Padilla; David Dean; Ciro A. Rodriguez. 2019. "Influence of Electrical Field Collector Positioning and Motion Scheme on Electrospun Bifurcated Vascular Graft Membranes." Materials 12, no. 13: 2123.

Journal article
Published: 19 March 2019 in Materials
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In this work we present a novel algorithm for generating in-silico biomimetic models of a cortical bone microstructure towards manufacturing biomimetic bone via additive manufacturing. The software provides a tool for physicians or biomedical engineers to develop models of cortical bone that include the inherent complexity of the microstructure. The correspondence of the produced virtual prototypes with natural bone tissue was assessed experimentally employing Digital Light Processing (DLP) of a thermoset polymer resin to recreate healthy and osteoporotic bone tissue microstructure. The proposed tool was successfully implemented to develop cortical bone structure based on osteon density, cement line thickness, and the Haversian and Volkmann channels to produce a user-designated bone porosity that matches within values reported from literature for these types of tissues. Characterization of the specimens using a Scanning Electron Microscopy with Focused Ion Beam (SEM/FIB) and Computer Tomography (CT) revealed that the manufacturability of intricated virtual prototype is possible for scaled-up versions of the tissue. Modeling based on the density, inclination and size range of the osteon and Haversian and Volkmann´s canals granted the development of a dynamic in-silico porosity (13.37–21.49%) that matches with models of healthy and osteoporotic bone. Correspondence of the designed porosity with the manufactured assessment (5.79–16.16%) shows that the introduced methodology is a step towards the development of more refined and lifelike porous structures such as cortical bone. Further research is required for validation of the proposed methodology model of the real bone tissue and as a patient-specific customization tool of synthetic bone.

ACS Style

José A. Robles-Linares; Erick Ramírez-Cedillo; Hector R. Siller; Ciro A. Rodríguez; J. Israel Martínez-López. Parametric Modeling of Biomimetic Cortical Bone Microstructure for Additive Manufacturing. Materials 2019, 12, 913 .

AMA Style

José A. Robles-Linares, Erick Ramírez-Cedillo, Hector R. Siller, Ciro A. Rodríguez, J. Israel Martínez-López. Parametric Modeling of Biomimetic Cortical Bone Microstructure for Additive Manufacturing. Materials. 2019; 12 (6):913.

Chicago/Turabian Style

José A. Robles-Linares; Erick Ramírez-Cedillo; Hector R. Siller; Ciro A. Rodríguez; J. Israel Martínez-López. 2019. "Parametric Modeling of Biomimetic Cortical Bone Microstructure for Additive Manufacturing." Materials 12, no. 6: 913.

Review
Published: 18 March 2019 in Materials
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The increase in accessibility of fused filament fabrication (FFF) machines has inspired the scientific community to work towards the understanding of the structural performance of components fabricated with this technology. Numerous attempts to characterize and to estimate the mechanical properties of structures fabricated with FFF have been reported in the literature. Experimental characterization of printed components has been reported extensively. However, few attempts have been made to predict properties of printed structures with computational models, and a lot less work with analytical approximations. As a result, a thorough review of reported experimental characterization and predictive models is presented with the aim of summarizing applicability and limitations of those approaches. Finally, recommendations on practices for characterizing printed materials are given and areas that deserve further research are proposed.

ACS Style

Enrique Cuan-Urquizo; Eduardo Barocio; Viridiana Tejada-Ortigoza; R. Byron Pipes; Ciro A. Rodriguez; Armando Roman-Flores. Characterization of the Mechanical Properties of FFF Structures and Materials: A Review on the Experimental, Computational and Theoretical Approaches. Materials 2019, 12, 895 .

AMA Style

Enrique Cuan-Urquizo, Eduardo Barocio, Viridiana Tejada-Ortigoza, R. Byron Pipes, Ciro A. Rodriguez, Armando Roman-Flores. Characterization of the Mechanical Properties of FFF Structures and Materials: A Review on the Experimental, Computational and Theoretical Approaches. Materials. 2019; 12 (6):895.

Chicago/Turabian Style

Enrique Cuan-Urquizo; Eduardo Barocio; Viridiana Tejada-Ortigoza; R. Byron Pipes; Ciro A. Rodriguez; Armando Roman-Flores. 2019. "Characterization of the Mechanical Properties of FFF Structures and Materials: A Review on the Experimental, Computational and Theoretical Approaches." Materials 12, no. 6: 895.

Journal article
Published: 05 March 2019 in Sustainability
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The circular economy (CE) model has become highly relevant in recent years, with the electronics industry being one of the sectors that has considered its application. Despite only a limited amount of literature being available on waste electric and electronic equipment (e-waste) in Mexico, the Mexican Government, academic institutions, and electronics industry have coordinated efforts to implement the CE in the country. This study evaluates the current technical and economic situation of cellphone e-waste generated in Mexico by surveying and analyzing the main actors that influence the management of this waste and using a material flow analysis. Extensive fieldwork was conducted in order to quantify the extent of cellphone e-waste processing in both formal and informal channels. The study of printed circuit boards in cellphones shows that the total value of cellphone e-waste materials ranges between $11.277 and $12.444 million USD per year in Mexico. However, a value of only $0.677 million USD is recycled through formal channels. After characterizing the remanufacturing and recycling CE loops, we conclude that the potential for improvement and advancing towards a CE model is significant

ACS Style

Daniela Cordova-Pizarro; Ismael Aguilar-Barajas; David Romero; Ciro A. Rodriguez. Circular Economy in the Electronic Products Sector: Material Flow Analysis and Economic Impact of Cellphone E-Waste in Mexico. Sustainability 2019, 11, 1361 .

AMA Style

Daniela Cordova-Pizarro, Ismael Aguilar-Barajas, David Romero, Ciro A. Rodriguez. Circular Economy in the Electronic Products Sector: Material Flow Analysis and Economic Impact of Cellphone E-Waste in Mexico. Sustainability. 2019; 11 (5):1361.

Chicago/Turabian Style

Daniela Cordova-Pizarro; Ismael Aguilar-Barajas; David Romero; Ciro A. Rodriguez. 2019. "Circular Economy in the Electronic Products Sector: Material Flow Analysis and Economic Impact of Cellphone E-Waste in Mexico." Sustainability 11, no. 5: 1361.

Journal article
Published: 10 January 2019 in Membranes
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Biocompatible and biodegradable membrane treatments for regeneration of bone are nowadays a promising solution in the medical field. Bioresorbable polymers are extensively used in membrane elaboration, where polycaprolactone (PCL) is used as base polymer. The goal of this work was to improve electrospun membranes’ biocompatibility and antibacterial properties by adding micro- and nanoparticles such as Ag, TiO2 and Na2Ti6O13. Micro/nanofiber morphologies of the obtained membranes were characterized by X-ray diffraction, Fourier-transform infrared spectroscopy, differential scanning calorimetry, scanning electron microscopy, energy-dispersive X-ray spectroscopy and a tensile test. Also, for this study optical microscopy was used to observe DAPI-stained cells. Membranes of the different systems were electrospun to an average diameter of 1.02–1.76 μm. To evaluate the biological properties, cell viability was studied by growing NIH/3T3 cells on the microfibers. PCL/TiO2 strength was enhanced from 0.6 MPa to 6.3 MPa in comparison with PCL without particles. Antibacterial activity was observed in PCL/TiO2 and PCL/Na2Ti6O13 electrospun membranes using Staphylococcus aureus bacteria. Bioactivity of the membranes was confirmed with simulated body fluid (SBF) treatment. From this study, the ceramic particles TiO2 and Na2Ti6O13, combined with a PCL matrix with micro/nanoparticles, enhanced cell proliferation, adhesion and antibacterial properties. The electrospun composite with Na2Ti6O13 can be considered viable for tissue regenerative processes.

ACS Style

Erick Ramírez-Cedillo; Wendy Ortega-Lara; Maria Rocha-Pizana; Janet A. Gutierrez-Uribe; Alex Elías-Zúñiga; Ciro A. Rodríguez. Electrospun Polycaprolactone Fibrous Membranes Containing Ag, TiO2 and Na2Ti6O13 Particles for Potential Use in Bone Regeneration. Membranes 2019, 9, 12 .

AMA Style

Erick Ramírez-Cedillo, Wendy Ortega-Lara, Maria Rocha-Pizana, Janet A. Gutierrez-Uribe, Alex Elías-Zúñiga, Ciro A. Rodríguez. Electrospun Polycaprolactone Fibrous Membranes Containing Ag, TiO2 and Na2Ti6O13 Particles for Potential Use in Bone Regeneration. Membranes. 2019; 9 (1):12.

Chicago/Turabian Style

Erick Ramírez-Cedillo; Wendy Ortega-Lara; Maria Rocha-Pizana; Janet A. Gutierrez-Uribe; Alex Elías-Zúñiga; Ciro A. Rodríguez. 2019. "Electrospun Polycaprolactone Fibrous Membranes Containing Ag, TiO2 and Na2Ti6O13 Particles for Potential Use in Bone Regeneration." Membranes 9, no. 1: 12.

Journal article
Published: 13 December 2018 in Materials
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In this work, we assess the effects of sterilization in materials manufactured using additive manufacturing by employing a sterilization technique used in the food industry. To estimate the feasibility of the hydrostatic high-pressure (HHP) sterilization of biomedical devices, we have evaluated the mechanical properties of specimens produced by commercial 3D printers. Evaluations of the potential advantages and drawbacks of Fused Deposition Modeling (FDM), Digital Light Processing (DLP) technology, and Stereolithography (SLA) were considered for this study due to their widespread availability. Changes in mechanical properties due to the proposed sterilization technique were compared to values derived from the standardized autoclaving methodology. Enhancement of the mechanical properties of samples treated with Hydrostatic high-pressure processing enhanced mechanical properties, with a 30.30% increase in the tensile modulus and a 26.36% increase in the ultimate tensile strength. While traditional autoclaving was shown to systematically reduce the mechanical properties of the materials employed and damages and deformation on the surfaces were observed, HHP offered an alternative for sterilization without employing heat. These results suggest that while forgoing high-temperature for sanitization, HHP processing can be employed to take advantage of the flexibility of additive manufacturing technologies for manufacturing implants, instruments, and other devices.

ACS Style

José A. Robles Linares-Alvelais; J. Obedt Figueroa-Cavazos; C. Chuck-Hernandez; Hector R. Siller; Ciro A. Rodríguez; J. Israel Martínez-López. Hydrostatic High-Pressure Post-Processing of Specimens Fabricated by DLP, SLA, and FDM: An Alternative for the Sterilization of Polymer-Based Biomedical Devices. Materials 2018, 11, 2540 .

AMA Style

José A. Robles Linares-Alvelais, J. Obedt Figueroa-Cavazos, C. Chuck-Hernandez, Hector R. Siller, Ciro A. Rodríguez, J. Israel Martínez-López. Hydrostatic High-Pressure Post-Processing of Specimens Fabricated by DLP, SLA, and FDM: An Alternative for the Sterilization of Polymer-Based Biomedical Devices. Materials. 2018; 11 (12):2540.

Chicago/Turabian Style

José A. Robles Linares-Alvelais; J. Obedt Figueroa-Cavazos; C. Chuck-Hernandez; Hector R. Siller; Ciro A. Rodríguez; J. Israel Martínez-López. 2018. "Hydrostatic High-Pressure Post-Processing of Specimens Fabricated by DLP, SLA, and FDM: An Alternative for the Sterilization of Polymer-Based Biomedical Devices." Materials 11, no. 12: 2540.

Journal article
Published: 24 September 2018 in Micromachines
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Magnesium alloys are of increasing interest in the medical industry due to their biodegradability properties and better mechanical properties as compared to biodegradable polymers. Fiber laser cutting of AZ31 magnesium alloy tubes was carried out to study the effect of cutting conditions on wall surface roughness and back-wall dross. During the experiments, an argon gas chamber was adapted in order to avoid material reactivity with oxygen and thus better control the part quality. A surface response methodology was applied to identify the significance of pulse overlapping and pulse energy. Our results indicate minimum values of surface roughness (Ra < 0.7 μm) when the spot overlapping is higher than 50%. A back-wall dross range of 0.24% to 0.94% was established. In addition, a reduction in back-wall dross accumulations was obtained after blowing away the dross particles from inside the tube using an argon gas jet, reaching values of 0.21%. Laser cutting experimental models show a quadratic model for back-wall dross related with the interaction of the pulse energy, and a linear model dependent on pulse overlapping factor for surface roughness.

ACS Style

Erika García-López; Juansethi R. Ibarra-Medina; Hector R. Siller; Jan A. Lammel-Lindemann; Ciro A. Rodriguez. Surface Finish and Back-Wall Dross Behavior during the Fiber Laser Cutting of AZ31 Magnesium Alloy. Micromachines 2018, 9, 485 .

AMA Style

Erika García-López, Juansethi R. Ibarra-Medina, Hector R. Siller, Jan A. Lammel-Lindemann, Ciro A. Rodriguez. Surface Finish and Back-Wall Dross Behavior during the Fiber Laser Cutting of AZ31 Magnesium Alloy. Micromachines. 2018; 9 (10):485.

Chicago/Turabian Style

Erika García-López; Juansethi R. Ibarra-Medina; Hector R. Siller; Jan A. Lammel-Lindemann; Ciro A. Rodriguez. 2018. "Surface Finish and Back-Wall Dross Behavior during the Fiber Laser Cutting of AZ31 Magnesium Alloy." Micromachines 9, no. 10: 485.

Conference paper
Published: 01 September 2018 in Journal of Physics: Conference Series
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Permanent magnet motors provide the highest power density and highest efficiency among all types of electric motors. For machine tool components and fast dynamic positioning systems the PMSM motors are commonly used. On the other hand, the BLDC motor delivers a higher torque to size ratio compared to DC motors, making it suitable for applications where weight and space are important factors. The construction of PMSM and BLDC motors is similar. However, they require completely different control approach, (Field Oriented Control for PMSM and Trapezoidal Control for BLDC). In this paper a new adaptive controller for PMSM and BLDC motors is proposed. For this controller a trapezoidal control is implemented and the torque ripple (due to non-trapezoidal back-EMF), is reduced using a Fourier series approach. The proposed controller was implemented experimentally and the results confirm it is effective to reduce the effect of internal torque ripple as well as the speed ripple produced by external periodic torque disturbances applied to the PMSM. Using the Adaptive Fourier Series Controller, the reduction on speed ripple was 2.7% of nominal speed when the first four terms of Fourier series were used, while the standard Field Oriented Control produced a speed ripple of 112% of the nominal angular speed.

ACS Style

Miguel A. Reyna; Alfonso Gómez-Espinosa; Ciro A. Rodríguez. Adaptive fourier series speed controller for permanent magnet synchronous motor and brushless dc motor. Journal of Physics: Conference Series 2018, 1074, 012012 .

AMA Style

Miguel A. Reyna, Alfonso Gómez-Espinosa, Ciro A. Rodríguez. Adaptive fourier series speed controller for permanent magnet synchronous motor and brushless dc motor. Journal of Physics: Conference Series. 2018; 1074 (1):012012.

Chicago/Turabian Style

Miguel A. Reyna; Alfonso Gómez-Espinosa; Ciro A. Rodríguez. 2018. "Adaptive fourier series speed controller for permanent magnet synchronous motor and brushless dc motor." Journal of Physics: Conference Series 1074, no. 1: 012012.

Journal article
Published: 03 August 2018 in Procedia Manufacturing
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Selective laser melting (SLM) is now, one of the most widespread Additive Manufacturing processes, due to presence in the market and known capabilities for the fabrication of mechanical components, with acceptable levels in geometrical accuracy, surface quality and mechanical properties. However, the metalworking industry is still skeptical for its full adoption in realistic production schemes, because of the lack of non-scholarly knowledge for calibrating process parameters among other technical barriers. In this work, several process planning guidelines are presented as a result of a SLM process calibration for a selected material (stainless steel 316L), with the intention of contributing in process parameters selection in net shape manufacturing. In order to conceive a proper set of guidelines for selective laser melting set up, several parameters were taken into account such as point distance, hatch distance, exposure time among others, with the aim of obtaining appropriate surface quality and good mechanical tensile behavior. Parts were obtained with good surface quality, presenting stable and well-defined weld lines and low presence of partially sintered particles adhered to the surface. After the application of the methodology, top and lateral surface roughness were improved, reaching values of Ra 5.81 and 9.61 µm respectively. In addition, good mechanical properties were obtained, of up to 500 MPa of ultimate tensile strength and 400 MPa of yield stress, comparable to the properties of sintered stainless steels alloys studied in previous works.

ACS Style

Erick Ramirez-Cedillo; Jesus Alejandro Sandoval Robles; Leopoldo Ruiz-Huerta; Alberto Caballero-Ruiz; Ciro Rodriguez; Hector R. Siller. Process planning guidelines in selective laser melting for the manufacturing of stainless steel parts. Procedia Manufacturing 2018, 26, 973 -982.

AMA Style

Erick Ramirez-Cedillo, Jesus Alejandro Sandoval Robles, Leopoldo Ruiz-Huerta, Alberto Caballero-Ruiz, Ciro Rodriguez, Hector R. Siller. Process planning guidelines in selective laser melting for the manufacturing of stainless steel parts. Procedia Manufacturing. 2018; 26 ():973-982.

Chicago/Turabian Style

Erick Ramirez-Cedillo; Jesus Alejandro Sandoval Robles; Leopoldo Ruiz-Huerta; Alberto Caballero-Ruiz; Ciro Rodriguez; Hector R. Siller. 2018. "Process planning guidelines in selective laser melting for the manufacturing of stainless steel parts." Procedia Manufacturing 26, no. : 973-982.

Journal article
Published: 03 August 2018 in Procedia Manufacturing
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Microneedles are an alternative to deliver chemical compounds through the skin for the treatment of several health conditions. In this work, a micro milling process was used to manufacture AISI 316L stainless steel needles arrays with a conical geometry (i.e., a base diameter and height of 1 mm by 1 mm, respectively). An analysis of tool wear on ball nose micro end milling tools with a diameter of ~200 μm was performed to evaluate the use of lubricant in the manufacture of those conical surfaces. A tool diameter reduction of 6% and 8% was obtained in dry cutting and wet cutting, after the manufacture of 9 and 54 needles respectively. Geometrical features on the needle tip resulted more affected in dry cutting regime compared with the wet treatment. A maximum needle tip diameter of 188 μm was reported on dry cutting versus values lower than 30 μm using wet regime. The results indicate that surface roughness increases after machining 36 and 9 needles in wet cutting regime and dry cutting treatment, respectively. However tool breakage occurs after milling 12 needles in dry cutting. A cost analysis shows that the micro milling approach is a competitive method for prototyping of microneedle arrays.

ACS Style

Erika García-López; Héctor Siller; Ciro A. Rodríguez. Study of the fabrication of AISI 316L microneedle arrays. Procedia Manufacturing 2018, 26, 117 -124.

AMA Style

Erika García-López, Héctor Siller, Ciro A. Rodríguez. Study of the fabrication of AISI 316L microneedle arrays. Procedia Manufacturing. 2018; 26 ():117-124.

Chicago/Turabian Style

Erika García-López; Héctor Siller; Ciro A. Rodríguez. 2018. "Study of the fabrication of AISI 316L microneedle arrays." Procedia Manufacturing 26, no. : 117-124.