Virginia Francisca Marañon-Ruiz
Current Organizations / Institutes
The organizations/institutes from the scholar's latest article
Virginia Francisca Marañon-Ruiz has a total of 19 co-authors. Here are the top co-authors by number of shared publications:
- Rita Patakfalvi
Centro Universitario de los Lagos, Universidad de Guadalajara, Lagos de Moreno 47460, Jalisco, Mexico
2 shared publications C.J. Enríquez Sánchez
División de Estudios de la Biodiversidad e innovación Tecnológica. Centro Universitario de los Lagos. Enrique Díaz de León 1144, Col. Paseo de la Montaña, C.P. 47460, Lagos de Moreno, Jalisco, México
1 shared publicationH. Pérez Ladrón de Guevara
División de Estudios de la Biodiversidad e innovación Tecnológica. Centro Universitario de los Lagos. Enrique Díaz de León 1144, Col. Paseo de la Montaña, C.P. 47460, Lagos de Moreno, Jalisco, México
1 shared publication- Héctor Pérez Ladrón de Guevara
Universidad de Guadalajara
1 shared publication J. Castañeda Contreras
División de Estudios de la Biodiversidad e innovación Tecnológica. Centro Universitario de los Lagos. Enrique Díaz de León 1144, Col. Paseo de la Montaña, C.P. 47460, Lagos de Moreno, Jalisco, México
1 shared publication- Jesús Castañeda Contreras
Centro Universitario de los Lagos, Universidad de Guadalajara, Lagos de Moreno 47460, Mexico
1 shared publication
Latest Publications
- Open Access
- 5 February 2021
- Published by MDPI AG in Nanomaterials
- Vol. 11 (2) , 410
Two-Step Triethylamine-Based Synthesis of MgO Nanoparticles and Their Antibacterial Effect against Pathogenic Bacteria
Magnesium oxide nanoparticles (MgO NPs) were obtained by the calcination of precursor microparticles (PM) synthesized by a novel triethylamine-based precipitation method. Scanning electron microscopy (SEM) revealed a mean size of 120 nm for the MgO NPs. The results of the characterizations for MgO NPs support the suggestion that our material has the capacity to attack, and have an antibacterial effect against, Gram-negative and Gram-positive bacteria strains. The ability of the MgO NPs to produce reactive oxygen species (ROS), such as superoxide anion radicals () or hydrogen peroxide (H2O2), was demonstrated by the corresponding quantitative assays. The MgO antibacterial activity was evaluated against Gram-positive Staphylococcus aureus and Gram-negative Escherichia coli bacteria, with minimum inhibitory concentrations (MICs) of 250 and 500 ppm on the microdilution assays, respectively. Structural changes in the bacteria, such as membrane collapse; surface changes, such as vesicular formation; and changes in the longitudinal and horizontal sizes, as well as the circumference, were observed using atomic force microscopy (AFM). The lipidic peroxidation of the bacterial membranes was quantified, and finally, a bactericidal mechanism for the MgO NPs was also proposed.- 5 February 2021
- Published by MDPI AG in Nanomaterials
- Vol. 11 (2) , 410
Open AccessTwo-Step Triethylamine-Based Synthesis of MgO Nanoparticles and Their Antibacterial Effect against Pathogenic Bacteria
Magnesium oxide nanoparticles (MgO NPs) were obtained by the calcination of precursor microparticles (PM) synthesized by a novel triethylamine-based precipitation method. Scanning electron microscopy (SEM) revealed a mean size of 120 nm for the MgO NPs. The results of the characterizations for MgO NPs support the suggestion that our material has the capacity to attack, and have an antibacterial effect against, Gram-negative and Gram-positive bacteria strains. The ability of the MgO NPs to produce reactive oxygen species (ROS), such as superoxide anion radicals () or hydrogen peroxide (H2O2), was demonstrated by the corresponding quantitative assays. The MgO antibacterial activity was evaluated against Gram-positive Staphylococcus aureus and Gram-negative Escherichia coli bacteria, with minimum inhibitory concentrations (MICs) of 250 and 500 ppm on the microdilution assays, respectively. Structural changes in the bacteria, such as membrane collapse; surface changes, such as vesicular formation; and changes in the longitudinal and horizontal sizes, as well as the circumference, were observed using atomic force microscopy (AFM). The lipidic peroxidation of the bacterial membranes was quantified, and finally, a bactericidal mechanism for the MgO NPs was also proposed. - Open Access
Stimuli-Responsive Systems in Optical Humidity-Detection Devices
The use of electronic devices to measure Relative Humidity (RH) is widespread. However, under certain circumstances, for example when explosive gases are present, a spark-free method should be used. Here we suggest the use of stimuli-responsive materials, like gelatin and interpenetrated polymers, to detect RH with an optical method. These materials are hydrophilic. When water vapor is absorbed by the films the molecules attach to the films molecular network. The result is that the film thickness increases and their refractive index changes. To detect the change of these two parameters an optical method based on diffraction gratings is employed. Surface diffraction gratings are recorded on the films. Then gratings are placed in an optical configuration that is immersed in a climatic chamber. A light beam is sent to the grating where it is diffracted. Several light orders appear. Due to the absorption of water molecules the films swell and grating surface modulation changes. This implies that the diffracted orders intensity changes. A calibrating plot relating intensity as a function of RH is obtained.
Open AccessStimuli-Responsive Systems in Optical Humidity-Detection Devices
The use of electronic devices to measure Relative Humidity (RH) is widespread. However, under certain circumstances, for example when explosive gases are present, a spark-free method should be used. Here we suggest the use of stimuli-responsive materials, like gelatin and interpenetrated polymers, to detect RH with an optical method. These materials are hydrophilic. When water vapor is absorbed by the films the molecules attach to the films molecular network. The result is that the film thickness increases and their refractive index changes. To detect the change of these two parameters an optical method based on diffraction gratings is employed. Surface diffraction gratings are recorded on the films. Then gratings are placed in an optical configuration that is immersed in a climatic chamber. A light beam is sent to the grating where it is diffracted. Several light orders appear. Due to the absorption of water molecules the films swell and grating surface modulation changes. This implies that the diffracted orders intensity changes. A calibrating plot relating intensity as a function of RH is obtained.
- 1 January 2018
- Published by Optica Publishing Group
- p. Tu4A.11
Determination of non-linear optical properties of TiO2 nanoparticles functionalized with an azo-triphenylmethane dye using the z-scan technique.
Z-scan technique offers simplicity to determine nonlinear optical properties. We propose its use in nanoparticles of TiO2 functionalized with an azo-triphenylmethane dye obtaining n2=3.37×10−3 and β=1.28×105 which allows us to propose them for solar cells.
- 1 January 2018
- Published by Optica Publishing Group
- p. Tu4A.11
Determination of non-linear optical properties of TiO2 nanoparticles functionalized with an azo-triphenylmethane dye using the z-scan technique.
Z-scan technique offers simplicity to determine nonlinear optical properties. We propose its use in nanoparticles of TiO2 functionalized with an azo-triphenylmethane dye obtaining n2=3.37×10−3 and β=1.28×105 which allows us to propose them for solar cells.