Browsing by Author "Cea, Sebastián"

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    Intelligence can grow in all dimensions: findings from an experiment in Latin America
    (2023) Claro, Susana; Santana Sepúlveda, Macarena Paz; Ossandón, Tomás; Cea, Sebastián; Amesti Mujica, José de; Santander Monsalve, Daniela Alejandra; Huerta, Mauricio
    Computer-based interventions that aim to help students endorse a growth mindset have been designed and tested in high-income countries for a number of years. However, there is no evidence of their efectiveness in middle-income nations. In those studies, students’ growth mindset has traditionally been measured using surveys where students report the extent to which they believe intelligence is fxed or malleable, without linking intelligence with a more specifc dimension, such as math or language. In addition, these measurements have been undertaken without distinctions being made between personal ability (“my” intelligence) and more general abilities (everyone’s intelligence). Therefore, by means of a randomized experiment, this study assesses the impact of a single-session online growthmindset intervention in Chile on distinct measurements of the growth mindset of students (general, personal, and subject-specifc), as well as their propensity to seek out challenges. Accordingly, a sample of 248 students was recruited from 9 and 11th grades in three secondary schools, all of whom were randomly assigned to either a treatment or control group. The intervention was found to increase their propensity to seek out challenges and to experience an increase in growth mindset scores in all tested dimensions. No evidence of the heterogeneity of results by gender or prior growth mindset was identifed.
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    Sulfate-modified MOF-808 as a superacid catalyst: a performance evaluation of Zr(iv) and Hf(iv) analogues in acetalization reactions
    (2025) Roa Gómez, Vanesa Belen; Cea, Sebastián; Pazo Carballo, César Alexander; Llanos, Jaime; Olivares, Douglas; Escalona, Néstor; Leiva Campusano, Ángel; Hidalgo-Rosa, Yoan; Zarate, Ximena; Dongil, Ana Belén; Schott Verdugo, Eduardo
    In this study, we report the synthesis and characterization of MOF-808-SO4-M (M = Zr(IV), Hf(IV)), derived from MOF-808-M precursors. The introduction of sulfate groups enhances the Brønsted acidity of these materials, significantly improving their catalytic performance in the benzaldehyde acetalization reaction. The materials were characterized using powder X-ray diffraction (PXRD), Fourier-transform infrared spectroscopy (FT-IR), nitrogen adsorption–desorption analysis, thermogravimetric analysis (TGA), energy-dispersive spectroscopy (EDS), and Hammett indicator tests. Catalytic evaluation revealed that MOF-808-SO4-Zr exhibited significantly higher conversion compared to its Hf-based analogue, a difference attributed to its greater density of acid sites, as confirmed by temperature-programmed surface reaction (TPSR) analysis. These experimental results were further supported by density functional theory (DFT) calculations, which provided insights into the acidic properties and catalytic behavior of the materials.