Vladimir Escobar-Barrios - Academia.edu (original) (raw)

Papers by Vladimir Escobar-Barrios

Bio-Medical Materials and Engineering

BACKGROUND: Polymerization conditions affect the physical-mechanical properties of acrylic resins... more BACKGROUND: Polymerization conditions affect the physical-mechanical properties of acrylic resins used for craniofacial prostheses. OBJECTIVE: The aim of this study was to evaluate the effect of microwave polymerization on the thermomechanical properties and surface morphology of ocular prostheses fabricated with polymethyl methacrylate (PMMA). METHODS: PMMA discs were polymerized with microwave energy and with conventional heat polymerization (CHP) method. Ocular prostheses were fabricated to determine whether there were changes according to the polymerization method. The surface morphology and roughness were observed under SEM and AFM. The Vickers Hardness number (VHN) and flexural strength were measured. Thermal properties were evaluated with TGA/DSC, and chemical composition with FTIR. RESULTS: The PMMA acrylic resin polymerized with microwave energy showed a smooth surface with some relief areas. In the internal surface of the ocular prosthesis with microwave energy the PMMA is...

Materials Chemistry and Physics

Chemical Engineering Journal

Construction and Building Materials, 2021

Journal of Environmental Chemical Engineering

3 Alma Berenice Jasso-Salcedo, Sandrine Hoppe, Fernand Pla, Vladimir Alonso Escobar-Barrios, 4 Ma... more 3 Alma Berenice Jasso-Salcedo, Sandrine Hoppe, Fernand Pla, Vladimir Alonso Escobar-Barrios, 4 Mauricio Camargo and Dimitrios Meimaroglou 5 Instituto Potosino de Investigación Científica y Tecnológica, División Ciencias Ambientales, Camino a la Presa de 6 San José 2055, Col. Lomas 4a Sección. C.P. 78216, San Luis Potosí, S.L.P., México. 7 CNRS, Laboratoire Réactions et Génie des Procédés, Université de Lorraine UMR 7274, Nancy, F-54001, France. 8 Instituto Potosino de Investigación Científica y Tecnológica, División de Materiales Avanzados, Camino a la Presa 9 de San José 2055, Col. Lomas 4a Sección. C.P. 78216, San Luis Potosí, S.L.P., México. 10 Université de Lorraine, ERPI, Equipe de Recherche sur les Processus Innovatifs, EA 6737, Nancy, F-54001, France. 11 12 *Corresponding author e-mail address: dimitrios.meimaroglou@univ-lorraine.fr 13 1 Present address author AB Jasso-Salcedo: Department of Materials and Environmental Chemistry, Arrhenius 14 Laboratory, Stockholm University,...

Petroleum Science and Technology, 2018

Interfacial tension and contact angle are two specific important parameters to take decisions for... more Interfacial tension and contact angle are two specific important parameters to take decisions for enhanced oil recovery, for instance, proper chemicals to use for surface tension reduction, expected wettability of solids, interaction between crude oil and rock. For this purpose, the article presents a method for easy calculation of the solid-liquid interfacial tension based on contact angle measurements applying Neumann's correlation and Young's equation. The main idea stands on the calculation of the rock parameters, like wettability, with known substances and extend these results to crude oils. It was possible, based on the results obtained, to establish a relationship between solid-liquid interfacial tension and contact angle for the crude oil – rock system, which can definitively be used for the calculation of interfacial tension of any other fluid spread out on the same kind of rock. A linear regression was obtained with an accuracy as good as R2 = 0.9989. Viscosity as ...

In order to remove fluoride or arsenic from drinking water, it is used adsorption methods. Howeve... more In order to remove fluoride or arsenic from drinking water, it is used adsorption methods. However, studies looking for new and effective adsorbents continue. Nanosilver or nano zinc oxide dispersions are used, conventionally, for medical applications and the studies ...

La presente invencion describe un material de empaque para biofiltros que comprende un polimero d... more La presente invencion describe un material de empaque para biofiltros que comprende un polimero de poliuretano y almidon. El material de empaque es resistente a la compactacion, es capaz de sorber compuestos organicos contaminantes y reduce el tiempo de arranque del biofiltro. El material de empaque puede ser utilizado como soporte en la biofiltracion de compuestos organicos volatiles y/o semi-volatiles presentes en efluentes gaseosos o liquidos.

Journal of Applied Polymer Science, 2020

Jose Luis Davila-Rodriguez 1, Jose Rene Rangel-Mendez 1, Vladimir A. Escobar-Barrios 1, and Keiko... more Jose Luis Davila-Rodriguez 1, Jose Rene Rangel-Mendez 1, Vladimir A. Escobar-Barrios 1, and Keiko Shirai 2.(1) Division of Environmental Sciences, IPICyT, Camino a la Presa San José 2055. Col. Lomas 4 sección, San Luis Potosí, 78216, Mexico,(2) Biotechnology ...

Journal of Materials Science: Materials in Medicine

The local administration of analgesic combinations by means of degradable polymeric drug delivery... more The local administration of analgesic combinations by means of degradable polymeric drug delivery systems is an alternative for the management of postoperative pain. We formulated a Tramadol–Dexketoprofen combination (TDC) loaded in poly(vinyl alcohol) (PVA) film. Films were prepared by the solvent casting method using three different molecular weights of PVA and crosslinking those films with citric acid, with the objective of controlling the drug release rate, which was evaluated by UV–vis spectrometry. Non-crosslinked PVA films were also evaluated in the experiments. Differential scanning calorimetry (DSC) analysis of samples corroborated the crosslinking of PVA by the citric acid. Blank and loaded PVA films were tested in vitro for its impact on blood coagulation prothrombin time (PT) and partial thromboplastin time (PTT). The swelling capacity was also evaluated. Crosslinked PVA films of higher-molecular weight showed a prolonged release rate compared with that of the lower-mole...

Catalysts

The reduction of CO2 is relevant for the production of compounds as part of the carbon capture an... more The reduction of CO2 is relevant for the production of compounds as part of the carbon capture and utilization research approaches. Thus, photocatalytic reduction of CO2 over a tailored BiOCl-based photocatalyst (BTEG) was tested under UV light (365 nm). BTEG was synthesized in the presence of triethylene glycol, which gave 4-nm crystallites, much smaller than the 30 nm crystallites of commercial BiOCl. Commercial BiOCl reduced CO2 mainly to methane with a minor fraction of ethanol, and was inactivated after 20 h. BTEG was a more active catalyst for CO2 photoreduction, producing approximately equal amounts of methane, methanol, and ethanol while consuming 0.38 µmol g−1 h−1 of CO2 before the experiment was stopped after 43 h, with the catalyst still active. The different products formed by the BTEG photocatalyst samples were tentatively ascribed to its greater content of {110} facets. Thus, in addition to band-gap tuning, the relative fractions of BiOCl facets had a key role in the e...

Journal of Macromolecular Science, Part A

Photocatalysts - Applications and Attributes [Working Title]

The aim of the chapter is to present modified materials like alternatives for conventional photoc... more The aim of the chapter is to present modified materials like alternatives for conventional photocatalyst such as titanium dioxide. Discussion about silver/graphene nanoparticlesmodified zinc oxide for the degradation of pollutants like triclosan or bisphenol A, both considered as endocrine disruptors, which affect the hormonal development of humans, is presented. The best conditions to obtain the highest photodegradation degree are established. In addition, the bismuth oxychloride has gained attention during the last 5 years for photocatalysis. In accordance, the obtained results for phenol photodegradation, using such oxychloride, are also presented. In the chapter, the characterization of photocatalyst is reported along with the proposal for mechanisms of action for the modified ZnO photocatalyst and the bismuth oxychloride.