Skip to main content
SpringerLink
Log in

Analysis of low vapor pressure region of adsorption isotherm

II. Numerical analysis of composite adsorption isotherms

  • Originalarbeiten
  • Kolloide
  • Published:
Kolloid-Zeitschrift und Zeitschrift für Polymere Aims and scope Submit manuscript

Summary

Composite adsorption isotherms were numerically calculated using the conclusion of statistical thermodynamics of adsorption by a multicomponent surface (1). Usual BET plot of the calculated composite isotherms deviates from a straight line at relative vapor pressure less than 0.1. An apparent monolayer valueA ma which is obtained from the straight portion of BET plot is almost equal to the sum of each monolayer value∑A mi , when each adsorption energy factorC i ⩾10.

From these examinations, a new analytical method is proposed which determines theA mi 's andC i 's of each component by an analysis of the low pressure region of an isotherm. This method is applied to the experimental adsorption isotherms of various proteinwater systems, and it explains the experimental data quite satisfactorily.

Zusammenfassung

Adsorptionsisothermen an mehrkomponentigen Oberflächen wurden mit Hilfe der statistischen Thermodynamik berechnet. Auf Grund eingehender Untersuchungen konnte eine neue analytische Methode vorgeschlagen werden, um die WerteA mi undC i der BET-Gleichung für jede Komponente aus den Adsorptionsisothermen im Bereich niedriger relativer Drücke (< 0,1) zu bestimmen. Die Methode wurde am System Protein-Wasser überprüft. Sie erklärt die experimentellen Daten recht befriedigend.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

References

  1. Takizawa, A., submitted to Kolloid-Z. u. Z. Polymere (the previous paper).

  2. Heller, W. andA. Takizawa, Unpublished work. (Experimental details will be reported in near future.)

  3. Tanford, C, Physical Chemistry of Macromolecules, p 8 and 59 (London 1961).

  4. Fogiel, A. andW. Heller, J. Phys. Chem.70, 2039 (1966).

    PubMed  Google Scholar 

Download references

Author information

Author notes

  1. Akira Takizawa

    Present address: Faculty of Textile Technology, Tokyo Institute of Technology, Tokyo, Japan

Authors and Affiliations

    Authors
    1. Akira Takizawa
      View author publications

      You can also search for this author in PubMed Google Scholar

    Rights and permissions

    Reprints and permissions

    About this article

    Cite this article

    Takizawa, A. Analysis of low vapor pressure region of adsorption isotherm. Kolloid-Z.u.Z.Polymere 222, 143–148 (1968). https://doi.org/10.1007/BF01510797

    Download citation

    • Received:

    • Issue Date:

    • DOI: https://doi.org/10.1007/BF01510797

    Keywords

    Search

    Navigation