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Rapid Fabrication of Disposable Micromixing Arrays Using Xurography and Laser Ablation

Description: This article presents a novel split-and-recombine (SAR) array design adapted for interfacing standardized dispensing (handheld micropipette) and sampling (microplate reader) equipment.
Date: February 28, 2017
Creator: Martínez-López, J. Israel; Betancourt, H. A.; García-López, Erika; Rodríguez, Ciro A. & Siller, Héctor R.
Partner: UNT College of Engineering

Xurography as a Rapid Fabrication Alternative for Point-of-Care Devices: Assessment of Passive Micromixers

Description: This article evaluates the viability of xurography as a rapid fabrication tool for the development of ultra-low cost microfluidic technology for extreme Point-of-Care (POC) micromixing devices.
Date: February 20, 2016
Creator: Martínez-López, J. Israel; Mojica, Mauricio; Rodríguez, Ciro A. & Siller, Héctor R.
Partner: UNT College of Engineering

Hydrophobicity of Magnetite Coating on Low Carbon Steel

Description: Superhydrophobic coatings (SHC) with excellent self-cleaning and corrosion resistance property is developed on magnetite coated AISI SAE 1020 steel by using a simple immersion method. Roughness measurement, scanning electron microscopy (SEM), atomic force microscopy (AFM), X-ray diffraction (XRD), contact angle measurement (CAM), energy dispersive spectroscopy (EDS), Fourier transform infrared spectroscopy (FTIR), potentiodynamic polarization test, electrochemical impedance spectroscopy (EIS), and qualitative characterization of self-cleaning behavior, antifouling property and durability of the coatings are assessed. A water contact angle as high as 152o on the coated surface with excellent self-cleaning and resistivity to corrosion and good longevity in atmospheric air is obtained. Self-cleaning test results prove that these surfaces can find applications in large scale production of engineering materials. Potentiodynamic polarization tests and EIS tests confirm that the superhydrophobic low carbon steel surfaces have better resistance to corrosion compared to bare steel and magnetite coated steel in 3.5% NaCl solution. But the longevity of the coated steel surfaces in 3.5% salt solution is limited, which is revealed by the immersion durability test. However, hydrophobic coatings (HC) have better stability in normal tap water, and it can stay unharmed up to 15 days. Finally, hydrophobic coatings on low carbon steel surface retains hydrophobic in open atmosphere for more than two months. Results of this investigation show surface roughness is a critical factor in manufacturing hydrophobic steel surfaces. Higher contact angles are obtained for rougher and more uniform surfaces. A linear mathematical relationship (y =6x+104; R2 = 0.93) is obtained between contact angle (y) and surface roughness (x).
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Date: August 2018
Creator: Akhtar, Mst Alpona
Partner: UNT Libraries

Study of PVD AlCrN Coating for Reducing Carbide Cutting Tool Deterioration in the Machining of Titanium Alloys

Description: This article studies a thin nanocomposite film made out of AlCrN (aluminum-chromium-nitrite) to show experimental work in the deposition process and its characterization.
Date: March 5, 2013
Creator: Cadena, Natalia L.; Cue-Sampedro, Rodrigo; Siller, Héctor R.; Arizmendi-Morquecho, Ana M.; Rivera-Solorio, Carlos I. & Di-Nardo, Santiago
Partner: UNT College of Engineering

Evaluation of Superficial and Dimensional Quality Features in Metallic Micro-Channels Manufactured by Micro-End-Milling

Description: This article focuses on a set of experiments in the micro-milling of channels made of aluminum, titanium alloys and stainless steel.
Date: March 1, 2013
Creator: Monroy-Vázquez, Karla P.; Attanasio, Aldo; Ceretti, Elisabetta; Siller, Héctor R.; Hendrichs-Troeglen, Nicolás J. & Giardini, Claudio
Partner: UNT College of Engineering

Polymeric Materials Reinforced with Multiwall Carbon Nanotubes: A Constitutive Material Model

Description: This article discusses the modification of an existing material model to take into account softening and residual strain effects observed in polymeric materials reinforced with carbon nanotubes when subjected to loading and unloading cycles.
Date: April 12, 2013
Creator: Córdova, René K.; Elías-Zúñiga, Alex; Elizalde, Luis E.; Siller, Héctor R.; Sánchez, José Antonio; Rodríguez, Ciro A. et al.
Partner: UNT College of Engineering

Study of performance of high speed turning using the volumetric dimension coefficient of resultant cutting force

Description: This article describes the experimental study of the resultant cutting force evolution of two coating carbide and a cermet inserts, during the dry turning of AISI 1045 steel with 400, 500, and 600 m/min cutting speeds.
Date: July 2013
Creator: Hernández-González, L. W.; Pérez-Rodríguez, R.; Zambrano-Robledo, P. C.; Siller, Héctor R. & Toscano-Reyes, H.
Partner: UNT College of Engineering

Experimental Study of Back Wall Dross and Surface Roughness in Fiber Laser Microcutting of 316L Miniature Tubes

Description: This article uses extensive experimentation to evaluate the effect of fiber laser micro-cutting parameters over average surface roughness and back wall dross in AISI 316L stainless steel mixture tubes.
Date: September 18, 2017
Creator: García-López, Erika; Medrano-Tellez, Alexis G.; Ibarra-Medina, Juansethi R.; Siller, Héctor R. & Rodríguez, Ciro A.
Partner: UNT College of Engineering