A Source of Systematic Errors in the Determination of Critical Micelle Concentration and Micellization Enthalpy by Graphical Methods in Isothermal Titration Calorimetry

Rogelio Jimenez Juarez; Mónica De La Luz Corea Téllez; Gabriela  Martínez Mejía; María de Jesús Martínez Ortiz; José Manuel del Río

doi:doi.org/10.3390/e23020236

A Source of Systematic Errors in the Determination of Critical Micelle Concentration and Micellization Enthalpy by Graphical Methods in Isothermal Titration Calorimetry

Rogelio Jimenez Juarez, Mónica De La Luz Corea Téllez, Gabriela Martínez Mejía, María de Jesús Martínez Ortiz, José Manuel del Río

Research output: Contribution to journal › Article › peer-review

Abstract

Isothermal titration calorimetry is frequently employed to determine the critical micelle concentration and the micellization enthalpy of surfactants in terms of geometrical characteristics of the titration curves. Previously we have shown theoretically that even for an infinitesimal injec- tion, the heat per titrant mol depends on the stock solution concentration. In this work, we explore experimentally the influence of the stock solution concentration on the geometrical characteristics of the titration curve and its effect in determining the critical micelle concentration and the micel- lization enthalpy of surfactants. The systematic study of this phenomenology involves a great number of measurements at different temperatures with several repetitions carried out using a robotic calorimeter.

Translated title of the contribution	Una fuente de errores sistemáticos en la determinación de la concentración crítica de micelas y la entalpía de micelización por métodos gráficos en calorimetría de titulación isotérmica
Original language	English
Article number	236
Pages (from-to)	1-23
Number of pages	23
Journal	Entropy
Volume	23
Issue number	236
DOIs	https://doi.org/doi.org/10.3390/e23020236
State	Published - 18 Feb 2021

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Jimenez Juarez, R., Corea Téllez, M. D. L. L., Martínez Mejía, G., Martínez Ortiz, M. D. J., & del Río, J. M. (2021). A Source of Systematic Errors in the Determination of Critical Micelle Concentration and Micellization Enthalpy by Graphical Methods in Isothermal Titration Calorimetry. Entropy, 23(236), 1-23. Article 236. https://doi.org/doi.org/10.3390/e23020236

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abstract = "Isothermal titration calorimetry is frequently employed to determine the critical micelle concentration and the micellization enthalpy of surfactants in terms of geometrical characteristics of the titration curves. Previously we have shown theoretically that even for an infinitesimal injec- tion, the heat per titrant mol depends on the stock solution concentration. In this work, we explore experimentally the influence of the stock solution concentration on the geometrical characteristics of the titration curve and its effect in determining the critical micelle concentration and the micel- lization enthalpy of surfactants. The systematic study of this phenomenology involves a great number of measurements at different temperatures with several repetitions carried out using a robotic calorimeter.",

keywords = "isothermal titration calorimetry; critical micelle concentration; micellization enthalpy; micelle formation",

author = "{Jimenez Juarez}, Rogelio and {Corea T{\'e}llez}, {M{\'o}nica De La Luz} and {Mart{\'i}nez Mej{\'i}a}, Gabriela and {Mart{\'i}nez Ortiz}, {Mar{\'i}a de Jes{\'u}s} and {del R{\'i}o}, {Jos{\'e} Manuel}",

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doi = "doi.org/10.3390/e23020236",

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A Source of Systematic Errors in the Determination of Critical Micelle Concentration and Micellization Enthalpy by Graphical Methods in Isothermal Titration Calorimetry. / Jimenez Juarez, Rogelio ; Corea Téllez, Mónica De La Luz ; Martínez Mejía, Gabriela et al.
In: Entropy, Vol. 23, No. 236, 236, 18.02.2021, p. 1-23.

Research output: Contribution to journal › Article › peer-review

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T1 - A Source of Systematic Errors in the Determination of Critical Micelle Concentration and Micellization Enthalpy by Graphical Methods in Isothermal Titration Calorimetry

AU - Jimenez Juarez, Rogelio

AU - Corea Téllez, Mónica De La Luz

AU - Martínez Mejía, Gabriela

AU - Martínez Ortiz, María de Jesús

AU - del Río, José Manuel

PY - 2021/2/18

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N2 - Isothermal titration calorimetry is frequently employed to determine the critical micelle concentration and the micellization enthalpy of surfactants in terms of geometrical characteristics of the titration curves. Previously we have shown theoretically that even for an infinitesimal injec- tion, the heat per titrant mol depends on the stock solution concentration. In this work, we explore experimentally the influence of the stock solution concentration on the geometrical characteristics of the titration curve and its effect in determining the critical micelle concentration and the micel- lization enthalpy of surfactants. The systematic study of this phenomenology involves a great number of measurements at different temperatures with several repetitions carried out using a robotic calorimeter.

AB - Isothermal titration calorimetry is frequently employed to determine the critical micelle concentration and the micellization enthalpy of surfactants in terms of geometrical characteristics of the titration curves. Previously we have shown theoretically that even for an infinitesimal injec- tion, the heat per titrant mol depends on the stock solution concentration. In this work, we explore experimentally the influence of the stock solution concentration on the geometrical characteristics of the titration curve and its effect in determining the critical micelle concentration and the micel- lization enthalpy of surfactants. The systematic study of this phenomenology involves a great number of measurements at different temperatures with several repetitions carried out using a robotic calorimeter.

KW - isothermal titration calorimetry; critical micelle concentration; micellization enthalpy; micelle formation

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