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Insights into the thermodynamics of surface reactions at the SiO2(s)/NaCl(aq) interface.

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Title: Insights into the thermodynamics of surface reactions at the SiO2(s)/NaCl(aq) interface.
Authors: Korade, Karla1 (AUTHOR), Begović, Tajana1 (AUTHOR) tajana.chem@pmf.hr
Source: Journal of Thermal Analysis & Calorimetry. Feb2026, Vol. 151 Issue 4, p3031-3045. 15p.
Subjects: Surface reactions, Solid-liquid interfaces, Salt, Calorimetry, Silica nanoparticles, Proton transfer reactions, Thermodynamics
Abstract: This study investigates the behavior of silica nanoparticles suspended in an aqueous sodium chloride solution during wetting, as well as changes in pH and sodium chloride concentration. We examine the processes and interactions at the silica/aqueous electrolyte solution interface, which involve reactions among water molecules, dissolved ions and the electrically charged silica surface. The nanoparticles were characterized using dynamic light scattering and electrokinetic measurements to determine their size, electrokinetic potential, and stability in acidic conditions. We performed three types of calorimetric experiments with both a dissolution calorimeter and an isothermal titration calorimeter to analyze the thermodynamics of surface processes on the silica nanoparticles. Through theoretical analysis, we distinguished between the contributions of silica surface protonation and sodium ion association. Our findings reveal that the enthalpy change resulting from immersing dry silica nanoparticles in aqueous sodium chloride is exothermic. Importantly, the enthalpies associated with protonation are independent of pH and ionic strength, while those related to sodium ion association are affected by both pH and the charge of the silica nanoparticle surface. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Thermal Analysis & Calorimetry is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 192504993
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Thermal+Analysis+%26+Calorimetry%22">Journal of Thermal Analysis & Calorimetry</searchLink>. Feb2026, Vol. 151 Issue 4, p3031-3045. 15p.
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  Data: <searchLink fieldCode="DE" term="%22Surface+reactions%22">Surface reactions</searchLink><br /><searchLink fieldCode="DE" term="%22Solid-liquid+interfaces%22">Solid-liquid interfaces</searchLink><br /><searchLink fieldCode="DE" term="%22Salt%22">Salt</searchLink><br /><searchLink fieldCode="DE" term="%22Calorimetry%22">Calorimetry</searchLink><br /><searchLink fieldCode="DE" term="%22Silica+nanoparticles%22">Silica nanoparticles</searchLink><br /><searchLink fieldCode="DE" term="%22Proton+transfer+reactions%22">Proton transfer reactions</searchLink><br /><searchLink fieldCode="DE" term="%22Thermodynamics%22">Thermodynamics</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: This study investigates the behavior of silica nanoparticles suspended in an aqueous sodium chloride solution during wetting, as well as changes in pH and sodium chloride concentration. We examine the processes and interactions at the silica/aqueous electrolyte solution interface, which involve reactions among water molecules, dissolved ions and the electrically charged silica surface. The nanoparticles were characterized using dynamic light scattering and electrokinetic measurements to determine their size, electrokinetic potential, and stability in acidic conditions. We performed three types of calorimetric experiments with both a dissolution calorimeter and an isothermal titration calorimeter to analyze the thermodynamics of surface processes on the silica nanoparticles. Through theoretical analysis, we distinguished between the contributions of silica surface protonation and sodium ion association. Our findings reveal that the enthalpy change resulting from immersing dry silica nanoparticles in aqueous sodium chloride is exothermic. Importantly, the enthalpies associated with protonation are independent of pH and ionic strength, while those related to sodium ion association are affected by both pH and the charge of the silica nanoparticle surface. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Thermal Analysis & Calorimetry is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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    Identifiers:
      – Type: doi
        Value: 10.1007/s10973-025-14710-x
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 15
        StartPage: 3031
    Subjects:
      – SubjectFull: Surface reactions
        Type: general
      – SubjectFull: Solid-liquid interfaces
        Type: general
      – SubjectFull: Salt
        Type: general
      – SubjectFull: Calorimetry
        Type: general
      – SubjectFull: Silica nanoparticles
        Type: general
      – SubjectFull: Proton transfer reactions
        Type: general
      – SubjectFull: Thermodynamics
        Type: general
    Titles:
      – TitleFull: Insights into the thermodynamics of surface reactions at the SiO2(s)/NaCl(aq) interface.
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            NameFull: Korade, Karla
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            NameFull: Begović, Tajana
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            – D: 15
              M: 02
              Text: Feb2026
              Type: published
              Y: 2026
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              Value: 151
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            – TitleFull: Journal of Thermal Analysis & Calorimetry
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