Chromatographia

, Volume 30, Issue 7–8, pp 382–387 | Cite as

Correlation between the surface free energy of modified and non-modified glasses with controlled porosity and their sorption properties

  • B. Jańczuk
  • I. Choma
  • A. L. Dawidowicz
  • A. Kliszcz
  • T. Białopiotrowicz
Originals

Summary

Contact angles for water and diiodomethane drops were measured on the surface of thermally and chemically (by Carbowax 20M bonding) modified porous glasses and on the surface of naphthalene, diphenyl and anthracene. Using the obtained results to a modified Young equation, dispersion and nondispersion components of the surface free energy of these glasses and organic substances were calculated.

The work of adhesion (WA) for benzene, naphthalene, diphenyl, anthracene, nitrobenzene was estimated and correlated with the capacity factors, (k′) of these substances. On the basis of experimental and calculated data it can be stated that the thermal treatment of porous glasses increases, their hydrophobicity but the Carbowax layer causes hydrophilicity. There is a linear relationship between k′ and WA which can be helpful for predicting retention data of chromatographed substances on the base of surface free energy which can be calculated from contact angle measurements.

Key Words

Column liquid chromatography Porous glass adsorbents Thermal and chemical modification Surface free energy 

Symbols

C

presence of a chemically bonded Carbowax layer

c

constant

k′

capacity factor

R

gas constant

T

absolute column temperature

t0

dead time

tR

retention time of given substance

s

total surface area

WA

the adhesion work of Phase 1 to Phase 2

γ1d1n

dispersion and nondispersion components of the surface free energy of Phase 1

γ2d2n

dispersion and nondispersion components of the surface free energy of Phase 2

λD

surface tension of diiodomethane

γDdDn

dispersion and nondispersion components of diiodomethane surface tension

λS

free energy fo the surface of porous glass

γSdSn

dispersion and nondispersion components of porous glass surface free energy

λw

surface tension of water

γWdWn

dispersion and nondispersion components of the surface tension of water

θD

contact angle for diiodomethane

θW

contact angle for water

∏eD

difference between the surface free energy of porous glass and of porous glass with diiodomethane film

∏eW

difference between the surface free energy of porous glass and of porous glass covered with water film

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Copyright information

© Friedr. Vieweg & Sohn Verlagsgesellschaft mbH 1990

Authors and Affiliations

  • B. Jańczuk
    • 1
  • I. Choma
    • 1
  • A. L. Dawidowicz
    • 1
  • A. Kliszcz
    • 1
  • T. Białopiotrowicz
    • 1
  1. 1.Department of Physical Chemistry, Faculty of ChemistryMaria Curie-Sklodowska UniversityLublinPoland

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