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

Diarium como herramienta didáctica para estudiantes de Máster

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

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

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

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

Diseño de encuestas de evaluación de la percepción del alumno sobre la utilidad de las diferentes actividades formativas en la adquisición de competencias

Memoria ID12-0195. Ayudas de la Universidad de Salamanca para la innovación docente, curso 2012-2013

Grabado de vídeos educativos para estudiantes de Ingeniería Química

Memoria ID-0078. Ayudas de la Universidad de Salamanca para la innovación docente, curso 2015-2016

Aplicación del modelo de clase invertida a prácticas de laboratorio

Memoria ID-0148. Ayudas de la Universidad de Salamanca para la innovación docente, curso 2016-2017

Visualización de sistemas termodinámicos en el aula

Memoria ID-0206. Ayudas de la Universidad de Salamanca para la innovación docente, curso 2015-2016