Fluid interface calorimetry

JOURNAL OF COLLOID AND INTERFACE SCIENCE

卷:596

Article

Garrido, Pablo F.¹  Bastos, Margarida²  Velazquez-Campoy, Adrian^3,4,5,6,7,8  Dumas, Philippe⁹  Pineiro, Angel¹ 

[1] Univ Santiago de Compostela, Fac Fis, Dept Fis Aplicada, E-15782 Santiago De Compostela, Spain

[2] Univ Porto, Fac Ciencias, Dept Quim & Bioquim, CIQ UP, R Campo Alegre 687, P-4169007 Porto, Portugal

[3] Univ Zaragoza, Joint Units IQFR CSIC BIFI, Inst Biocomputat & Phys Complex Syst BIFI, Zaragoza 50018, Spain

[4] Univ Zaragoza, GBsC CSIC BIFI, Zaragoza 50018, Spain

[5] Univ Zaragoza, Dept Biochem & Mol & Cell Biol, Zaragoza 50009, Spain

[6] Aragon Inst Hlth Res IIS Aragon, Zaragoza 50009, Spain

[7] Biomed Res Networking Ctr Liver & Digest Dis CIBE, Madrid 28029, Spain

[8] Govt Aragon, Fdn ARAID, Zaragoza 50018, Spain

[9] Strasbourg Univ, IGBMC, Dept Integrat Biol, F-67404 Illkirch Graffenstaden, France

关键词: Interfaces;    Calorimetry;    Adsorption;    Isothermal Titration Calorimetry;    Surface Tension;   

DOI  :  10.1016/j.jcis.2021.03.098

来源: Elsevier

【 摘 要 】

Hypothesis: Amphiphilic molecules spontaneously adsorb to fluid polar-nonpolar interfaces. The time scale of such adsorption depends on the molecular size and structure of the solute. This process should be accompanied by a power heat exchange that could be detected by commercial isothermal calorimeters. Experiments: Air is injected in the bulk of different aqueous solutions contained in the sample cell of an isothermal titration calorimeter. The formation of the resulting bubbles leads to a liquid/air interface to which the solute molecules spontaneously adsorb. Continuous injection experiments to produce multiple bubbles as well as experiments with static bubbles stand from the capillary tip, aiming to observe slow adsorption processes, were performed. Findings: The power associated with the formation, growth and release of air bubbles in different liquids was measured. Different independent contributions that can be associated to the pressure change in the gas phase, the evaporation-condensation of the solvent, the increase of interfacial area, the change in the heat capacity of the sample cell content, and the release of the bubble were observed. The periodic pattern produced by the continuous injection of air at a constant rate is used to determine the surface tension of different liquids, including solutions of different molecules and (bio)macromolecules. (c) 2021 Elsevier Inc. All rights reserved.

【 授权许可】

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