Understanding the Role of Oxidative Debris on the Structure of Graphene Oxide Films at the Air–Water Interface: A Neutron Reflectivity Study

[EN]We address here the role of oxidation impurities on the structure of graphene oxide films at the air−water interface by specular neutron reflectivity (SNR). We study films of purified graphene oxide (PGO) and nonpurified graphene oxide in the close-packed state. Nonpurified graphene oxide is constituted by graphene oxide (GO) layers with oxidation impurities adsorbed on the basal plane, while in PGO sheets, impurities are eliminated. SNR measurements show that GO films are formed by welldefined bilayers constituted by 2−3 layers of GO stacked in contact with air and a second layer of impurities submerged in the aqueous subphase. In contrast, PGO films are formed by a single layer in contact with air. We show for the first time that impurities constitute a layer submerged in the aqueous subphase, decrease the elasticity, and favor the collapse of graphene oxide films. Our results allow designing the surface properties of GO trapped at fluid interfaces

Langmuir‐Blodgett Methodology: A Versatile Technique to Build 2D Material Films

The Langmuir‐Blodgett (LB) methodology is based on the transfer process of a monolayer adsorbed at the water interface, Langmuir film, from the air‐water interface onto solids by vertical dipping of the substrate immersed on the subphase. The technique allows the continuous variation of material density, packing, and arrangement by compressing or expanding the film by using barriers. Consequently, it provides the possibility of preparing films with the control of interparticle distance necessary to exploit the two‐dimensional (2D) materials in technological applications. In this chapter, we present some examples of fabrication of thin films of 2D material using this methodology. We show some methodologies based on this technique to build thin films of graphene oxides, Quantum Dots (QDs), and silver nanowires

Valoración del programa de mentorías universitarias GuíaMe-AC-UMA por parte del mentor y un profesional observador

El programa GuíaMe-AC-UMA es un programa de enriquecimiento extracurricular dirigido a estudiantes identificados con altas capacidades intelectuales (AACCII) entre 14 y 17 años, desde 3ª de ESO a 2º de Bachiller y Ciclos Formativos de Grado Medio y Superior. Este programa está coordinado y evaluado por especialistas en Psicología y Educación. En este programa participan todos los centros educativos ya sean públicos, concertados o privados, coordinados desde la Universidad de Málaga con la Colaboración de la Delegación territorial de la Consejería de Educación. Los mentores son profesores de la UMA con grado de Doctor y con actividad investigadora de reconocida relevancia. En este estudio se presentan los datos correspondientes a la V edición (curso académico 2016-17) del programa GuíaMe. En esta edición participaron un total de 190 alumnos, 25 mentores y se ofertaron 30 talleres correspondientes a disciplinas como Ciencias, Ciencias de la Salud, Ciencias Sociales y Humanidades, Matemáticas, Arquitectura, Geología, Física y Química e Informática. En el presente trabajo se analizan los resultados sobre el grado de acuerdo entre el Profesor Mentor (M) que imparte el taller y el miembro del Equipo Técnico o colaborador (ET) responsable del seguimiento y supervisión del taller. Para ello se ha diseñado un cuestionario ad hoc de seguimiento compuesto por 6 dimensiones con un número diferente de ítems. Por último, se presentan una serie de ítems que permiten realizar una valoración global del taller. . Se presentan y discuten los resultados encontrados, concluyendo que el grado de acuerdo entre el mentor y el profesional observador es muy alto así como la valoración global que realizan sobre el desarrollo del taller.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tec

Improving Motivation And Continuous Assessment In Engineering Classrooms Through Student Response Systems

The use of Student Response Systems (SRS) is highly recommended to encourage the active and meaningful learning of students in each lecture. SRS promotes the motivation of students and improves the system of continuous assessment. One of the most popular applications designed for SRS is Socrative (Socrative n.d.). The use of Socrative gives real meaning to continuous assessment, since the teacher has an easily manageable record of the evolution of their students‘learning and will help the teacher to schedule both formative and summative assessment. The application allows the detection of topics that each student may not have understood and determines the percentage of the entire class with the same difficulty. Beyond the use of Socrative as an evaluation instrument, sufficiently referenced, in this article we present different methodologies supported by SRS implemented in engineering studies at the University the Salamanca. The methodologies aim to promote autonomous work outside the classroom, and in face-to-face classes, to maintain the attention and lead the reasoning of the students to facilitate learning. The influence of the methodologies proposed by the authors on a series of indicators related to the motivation and commitment of the students to the subjects will be presented. To the best of our knowledge, most of the work on SRS have been applied to non-university educational levels and for assessment purposes and very few of them have applied SRS to undergraduate engineering studies. The novelty of this work lies in introducing new methodologies supported by SRS in university engineering studies

Uso de sistemas de respuesta inmediata como instrumento de evaluación continua en materias de ciencias

Memoria ID-048. Ayudas de la Universidad de Salamanca para la innovación docente, curso 2018-2019

Diarium como herramienta didáctica para estudiantes de Máster

Memoria ID-0066. Ayudas de la Universidad de Salamanca para la innovación docente, curso 2014-2015

Aplicación de la metodología aprendizaje/servicio en las prácticas de laboratorio del área de química física

Memoria ID-155. Ayudas de la Universidad de Salamanca para la innovación docente, curso 2019-2020

Laboratorio virtual de química física

Memoria ID 107. -Ayudas de la Universidad de Salamanca para la innovación docente, curso 2020-2021

Clay minerals study in terminal Messinian - early Zanclean sediments from the Malaga basin (S Spain). Preliminary results

El análisis de la composición mineralógica global de los sedimentos Lago-Mare y del Zancliense inferior de la cuenca de Málaga muestra diferencias significativas hacia la mitad de la secuencia del Zancliense inferior. Este cambio consiste en un aumento de dolomita, un descenso de filosilicatos y la desaparición del yeso, lo que puede relacionarse con una mayor profundización de la cuenca y un aumento en los aportes procedentes de la erosión de las dolomías maláguides en el área fuente. Por el contrario, el estudio de los minerales de la arcilla muestra un cambio sustancial en el límite Mioceno-Plioceno, apreciándose un aumento considerable en esmectita, un descenso en illita y caolinita, y la práctica desaparición de clorita. Este hecho podría relacionarse con un cambio en las condiciones climáticas, pasando de un clima húmedo y cálido a uno más seco, sin mencionar la posible influencia de la tectónicaThe analysis of bulk mineralogical composition of Lago-Mare and early Zanclean sediments of the Malaga basin shows a significant change from the middle of the early Zanclean sequence. It consists in an increase in the proportion of dolomite, accompanied by a decrease of phyllosilicates and the disappearance of gypsum. This change can be related to further deepening of the basin and to the increases of sediment inputs from the erosion of Malaguide dolomites in the source area. By contrast, the clay minerals study shows a substantial change in the Miocene-Pliocene boundary, showing a significant increase in smectite, a decrease in illite and kaolinite, and the disappearance of chlorite. This fact could be related to a change from a hot and humid climate to a drier one, not to mention the possible influence of tectonic

Paleoclimatic records from the Fuente Nueva 1 section (Orce, Guadix-Baza Basin, NE Granada, Spain): preliminary mineralogical data

The mineralogical study of 45 samples collected from the Fuente Nueva 1 (FN1) section (Orce, NE Granada, Spain) has been carried out using X-ray diffraction data on bulk powder and <2 m fraction to the establishment the paleoclimatic record and the origin of the inputs into the basin. The FN1 section is located in the central sector of the Betic Cordillera. During the Pliocene and Pleistocene, the Baza sub-basin was dominated by lacustrine deposits. The FN1 section (in Baza sub-basin) comprises a lower unit of Pliocene age consisting of lacustrine limestones and marls. Discordant on it, the Pleistocene is characterized by an alternation of two alluvial and two lacustrine episodes. In the first lacustrine episode is located the paleontological site of FN1 (approx. 2.3 Ma), which represents the oldest Pleistocene macrovertebrate site of Baza sub-basin. Moreover, this basin preserves some of the earliest evidences of human presence in Europe in several archaeo-paleontological sites correlated with the second Pleistocene lacustrine episode of FN1 section. The climate during the deposition of FN1 section was temperate to warm-subarid with seasonal contrast as suggested the high occurrence of 2:1 layer phyllosilicates. The subarid conditions were more remarkable in the first Pleistocene alluvial episode as attested by an increase in palygorskite and precipitation of gypsum. Whereas, at the end of the second alluvial episode, the humid conditions were established as showed by lack in palygorskite and increase in illite and kaolinite. The variable quartz/phyllosilicate (Qz/Phy) and occurrence of muscovite and paragonite in samples at the end of the second Pleistocene lacustrine episode indicate a high detrital input from the Internal Zone outcrop in the south of the basin. Further studies include a precise characterization of morphology and geochemistry of the clay minerals in order to provide better paleoclimatical and paleoenvironmental characterization of basin.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech