کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10377697 | 880741 | 2005 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Calorimetric study of the reactions of n-alkylphosphonic acids with metal oxide surfaces
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
شیمی کلوئیدی و سطحی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Calorimetric study of the reactions of n-alkylphosphonic acids with metal oxide surfaces Calorimetric study of the reactions of n-alkylphosphonic acids with metal oxide surfaces](/preview/png/10377697.png)
چکیده انگلیسی
The reaction enthalpies for the solution-phase self-assembly of n-alkylphosphonic acids on the surfaces of TiO2 and ZrO2 have been determined using isothermal titration calorimetry at 298 K. The reaction enthalpies were negative (exothermic) for methyl- and n-octylphosphonic acids and positive (endothermic) for n-octadecylphosphonic acid with both metal oxides. The enthalpy/energy analysis showed that the net enthalpy of the formation of self-assembled monolayers (SAMs) at solid-liquid interface can be presented as follows: ÎHr=âDâ(ÎHsol+ÎHdil)â(ESâESAM), where D is the binding energy of the SAM molecules with the solid; ÎHsol and ÎHdil are the enthalpies of dissolution and dilution; ES and ESAM are the surface energies of bare solid and SAM, respectively. This equation predicted an increase (and the sign change) of the reaction enthalpy as the alkyl group in n-alkylphosphonic acid increased, which explained the experimental data. Using this equation, the binding energy (D) in the SAMs of n-octyl- and n-octadecylphosphonic acids were estimated: 55±5kJ/mol (for ZrO2) and 58±7kJ/mol (for TiO2).
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Colloid and Interface Science - Volume 286, Issue 1, 1 June 2005, Pages 258-262
Journal: Journal of Colloid and Interface Science - Volume 286, Issue 1, 1 June 2005, Pages 258-262
نویسندگان
Jaime M. Ferreira, Stephen Marcinko, Richard Sheardy, Alexander Y. Fadeev,