Rafael Roa
University of Málaga
61 Papers
317 Citations
Rafael Roa is an academic researcher from University of Málaga. The author has contributed to research in topics: Electrokinetic phenomena & Particle. The author has an hindex of 17, co-authored 59 publications. Previous affiliations of Rafael Roa include University of Granada & Forschungszentrum Jülich.
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Papers
An Onto-Semiotic Analysis of Combinatorial Problems and the Solving Processes by University Students
TL;DR: An ontological and semiotic model for mathematical knowledge is described, using elementary combinatorics as an example, and its utility in providing a semiotic explanation for the difficulty of combinatorial reasoning is shown.
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Catalyzed Bimolecular Reactions in Responsive Nanoreactors
Rafael Roa,Won Kyu Kim,Matej Kanduč,Joachim Dzubiella,Joachim Dzubiella,Stefano Angioletti-Uberti +5 more
TL;DR: A general theory for surface-catalyzed bimolecular reactions in responsive nanoreactors, catalytically active nanoparticles coated by a stimuli-responsive “gating” shell, whose permeability controls the activity of the process, shows that the identification of a limiting reactant is not simply determined by the relative bulk concentrations but is controlled by the nanoreactor shell permeability.
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Models for Statistical Pedagogical Knowledge
Juan D. Godino,Juan Jesús Ortiz,Rafael Roa,Miguel R. Wilhelmi +3 more
- 01 Jan 2011
TL;DR: In this paper, some models that are relevant for mathematics and statistics are analysed, and a new framework that complements the previously described models is proposed, and some implications for the training of teachers are presented.
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Selective Molecular Transport in Thermoresponsive Polymer Membranes: Role of Nanoscale Hydration and Fluctuations
TL;DR: In this paper, the diffusion properties of penetrants ranging from nonpolar to polar molecules and ions in a matrix of collapsed poly(N-isopropylacrylamide) (PNIPAM) polymers in water were investigated by means of extensive molecular dynamics simulations.
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Tuning the Permeability of Dense Membranes by Shaping Nanoscale Potentials.
TL;DR: It is demonstrated that the observed nonmonotonic behavior and the occurrence of extreme values of the permeability is far from trivial and triggered by a strong anticorrelation and substantial cancellation between penetrant partitioning and diffusivity, especially within dense and highly attractive membranes.
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