Rosalba Fuentes‐Ramírez

Universidad de Guanajuato

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Rosario Galindo

Instituto Superior Técnico

David Contreras López

Universidad de Guanajuato

V. M. Castaño

Autonomous University of Queretaro

E. Rubio

Benemérita Universidad Autónoma de Puebla

Guadalupe de la Rosa

Universidad de Guanajuato

Miguel A. Sandoval

Tecnológico Nacional de México

R. Carrera-Cerritos

Instituto Politécnico Nacional

Carlos Velasco‐Santos

Instituto Tecnológico de Querétaro

Blanca M. Muñoz‐Flores

Universidad Autónoma de Nuevo León

A. Medina-Ramírez

Universidad de Guanajuato

Cooperative Institutions

Universidad de Guanajuato

122

Universidad Nacional Autónoma de México

Instituto Politécnico Nacional

Autonomous University of Queretaro

Center for Research and Advanced Studies of the National Polytechnic Institute

Centro de Investigaciones en Optica

Universidad Autónoma de Nuevo León

Center of Research and Technologic Development in Electrochemistry

Centro de Investigación en Materiales Avanzados

Universidad Autónoma Metropolitana

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Synthesis and characterization of isoprene polymers with polar groups via reversible addition‐fragmentation chain‐transfer polymerization

Journal of Polymer Science Part A Polymer Chemistry (2018)

David Contreras López Rosalba Fuentes‐Ramírez Martha Albores‐Velasco Gladys de los Santos‐Villarreal Enrique Saldívar‐Guerra

ABSTRACT Homo and copolymerization of isoprene (IP) with small amounts (1% wt) of glycidyl methacrylate) were conducted using the reversible addition‐fragmentation chain‐transfer process (RAFT) at 125 °C in a solution polymerization process using toluene as solvent. Suitable reaction conditions to avoid Diels–Alder dimerization of IP and crosslinking were determined; and 4‐cyano‐4‐[(dodecylsulfanylthiocarbonyl)sulfanyl] pentanoic acid was found to be the best transfer agent among those tested. Theoretical calculations were used to understand why some RAFT agents work better than others in these polymerizations. Molecular weights M n higher than 100,000 Da were reached by successive chain extension experiments, confirming the livingness of the intermediate polymers. All the successful polymerizations yielded average molar masses ( M n ) of about 75% compared to the theoretical M n ( M n,theo ) depending on the agent used for control. The dispersity ( Ð ) ranged from 1.20 to 1.70 being a function of the control agent. The polymers were characterized by FTIR spectroscopy, 1 H NMR, and gel permeation chromatography. © 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2018 , 56 , 2463–2474

Chain transfer

Dispersity

Raft

Molar mass

Transfer agent

Gel permeation chromatography

Isoprene

Glycidyl methacrylate

10.1002/pola.29221

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Citations (10)

EIS analysis of oxygen reduction reaction of Pt supported on different substrates

International Journal of Hydrogen Energy (2017)

B. Ruiz-Camacho Juan Carlos Baltazar Vera A. Medina-Ramírez Rosalba Fuentes‐Ramírez Gilberto Carreño Aguilera

Linear sweep voltammetry

10.1016/j.ijhydene.2017.08.087

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Citations (55)

Arsenic and fluoride removal by electrocoagulation process: A general review

The Science of The Total Environment (2020)

Miguel A. Sandoval Rosalba Fuentes‐Ramírez Abdoulaye Thiam Ricardo Salazar

Electrocoagulation

10.1016/j.scitotenv.2020.142108

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Citations (160)

CCDC 1025271: Experimental Crystal Structure Determination

The Cambridge Structural Database (2015)

Marisol Ibarra-Rodrı́guez Víctor M. Jiménez‐Pérez Blanca M. Muñoz‐Flores Noemí Waksman de Torres Rosalba Fuentes‐Ramírez

10.5517/cc13dw8n

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Citations (0)

Unexpected reactivity of “GaI” towards N,N′-diaryl-β-diketiminate tin(II) chloride: Synthesis, X-ray diffraction analysis and DFT studies

Arabian Journal of Chemistry (2015)

Marisol Ibarra-Rodrı́guez Víctor M. Jiménez‐Pérez Blanca M. Muñoz‐Flores Noemí Waksman de Torres Rosalba Fuentes‐Ramírez

Reaction of the [HC(CMeNAr)2]SnCl (Ar = 2,4,6-Me3C6H2) with "GaI" in THF provided an unexpected transhalogenation reaction product [HC(CMeNAr)2]SnI. The crystal structure shows a tin(II) ion with a distorted tetrahedral pyramidal geometry. Theoretical calculations, using density functional theory (B3LYP), suggest the probable reaction mechanism for transhalogenation. The activation energy for moving from reactant ([HC(CMeNAr)2]SnCl to product [HC(CMeNAr)2]SnI) is only 10.2 kcal/mol. The chloride ion is displaced by the iodine ion, probably by the help of the gallium atom when it is coordinated to the chlorine atom.

Reactivity

10.1016/j.arabjc.2015.08.030

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Citations (2)

Graphene oxide and graphite oxide used as reinforcement in composites synthesized from cellulose acetate and polyacrylic acid

Revista de Innovación Sistemática (2021)

J. A. Sánchez-Márquez Rosalba Fuentes‐Ramírez B. Ruiz-Camacho

This work focused on the synthesis and characterization of composites, obtained based on polyacrylic acid and cellulose acetate, which incorporated graphite oxide and graphene oxide as structural reinforcement. The composites were obtained using the phase inversion method and the incorporation of the reinforcement, during the synthesis process, was carried out in proportions of 1% by weight. The characterization of the composites was carried out using IR, Raman, BET, SEM spectroscopy techniques and methods for determining acidic and basic sites. The results obtained showed that it is possible to synthesize composites that present a network configuration, made up of layers that give the material the effect of depth. Furthermore, it was possible to observe that both graphite oxide and graphene oxide were deposited on the outer edge of the hexagonal pores present in the material. Finally, the concentration values of acidic and basic sites were obtained. The presence of these sites could be associated with carboxylic groups inserted during the oxidation of graphitic materials and with non-reactive sites present in cellulose.

Graphite oxide

Cellulose acetate

Polyacrylic acid

10.35429/jsi.2021.16.5.6.13

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La Formación de Docentes: entre lo deseable y lo posible

Contexto educativo: revista digital de investigación y nuevas tecnologías (2003)

Lucía Rodríguez Rosalba Fuentes‐Ramírez

Source

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Comparative study of P25/BiOCl mixtures as photocatalysts in Acid Orange 7 degradation

Journal of Scientific and Technical Applications (2021)

Lorena MENDEZ-ALVARADO Miguel A. RIVERA-FLORES Miguel A. Sandoval Rosalba Fuentes‐Ramírez

Objectives. Among strategies used to improve the photocatalytic properties of titanium dioxide (TiO2), coupled semiconductor has been widely studied. Bismuth oxychloride (BiOCl) semiconductor has been highlighted, specially, with hierarchical structures (3D), because it has been shown to have higher performance in the photodegradation of organic dyes in wastewater. Therefore, in this work the degradation efficiency of acid orange 7 (AO7) was studied using TiO2 (P25 Degussa), synthesized BiOCl with hierarchical structure, and mixtures of them as photocatalysts. Methodology. BiOCl was synthesized by the solvothermal method. The BiOCl was characterized by different techniques such as X-ray diffraction (XRD) and scanning electron microscopy (SEM). In addition, the pore distribution and the surface area were determined. Photocatalytic experiments were carried out with a photocatalyst dose of 1 g‧L-1, initial dye concentration of 50 mg‧L-1, and UV light illumination. Contribution. The interaction of P25 Degussa with BiOCl microspheres (75/25, respectively) improved the photocatalytic degradation achieving a 50% degradation efficiency.

Photodegradation

Titanium Dioxide

Degradation

Methyl orange

10.35429/jsta.2021.19.7.25.28

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Graphene oxide and reduced graphene oxide modification with polypeptide chains from chicken feather keratin

Journal of Alloys and Compounds (2014)

Edgar Jiménez-Cervantes Amieva Rosalba Fuentes‐Ramírez Ana Laura Martínez‐Hernández Blanca E. Millán‐Chiu Luz M. López-Marı́n

Biocompatibility

Biomolecule