RELATIONSHIP BETWEEN WETTING OF TEFLON BY CETYLTRIMETHYLAMMONIUM BROMIDE SOLUTION AND ADSORPTION

doi:10.1016/S0014-3057(96)00230-3

European Polymer Journal

Volume 33, Issue 7, July 1997, Pages 1093-1098

https://doi.org/10.1016/S0014-3057(96)00230-3 Get rights and content

Abstract

Contact angles for cetyltrimethylammonium bromide (CTAB) solution (θ) and for series of n-alkanes from n-hexane to n-hexadecane on a Teflon surface were measured. In addition, contact angle measurements for water and diiodomethane on Teflon surface covered with CTAB layer were carried out. The results obtained are used for the determination of the amount of CTAB adsorbed at the Teflon/water interface, the surface free energy of Teflon, the interfacial free energy of Teflon/CTAB solution, the standard free energy of adsorption and the standard free energy of micellization. From an adhesion tension plot of γ_L cos θ vs γ_L and application of the Gibbs and Young equations it appears that the amount adsorbed to the Teflon/water interface at a high equilibrium concentration of CTAB is close to that adsorbed at the water/air interface, whereas in the range of low concentrations there are considerable differences between adsorption at Teflon/water and water/air interfaces. This is confirmed by data obtained from the plot of Teflon/solution interface free energy against CTAB solution concentration. It is found that the standard free energy of adsorption at the Teflon/water interface can be determined approximately from the interfacial tail of surfactant-water, tail-tail and tail-Teflon tension data. A good agreement between the standard free energy of micellization and free energy of interactions of CTAB ions through water is found. The free energy of interactions between CTAB ions through water is determined on the basis of the surface free energy of CTAB and the ψ potential. © 1997 Elsevier Science Ltd

Section snippets

INTRODUCTION

Wetting of solids by surface active agents is important for many technological applications such as oil recovery, coating, adhesion, ore flotation, printing and detergency.

Wetting is often investigated without resorting to adsorption studies. However, adsorption and wetting are strongly related. Adsorption of a surface active agent at a solid/water interface leads to a layer or film formation on the solid surface, which affects its surface tension. The presence of the surface agent film changes

Materials

CTAB (analytically pure, Chemapol Prague, Czechoslovakia) was purchased commercially and recrystallized twice from absolute alcohol, dried and kept in a desiccator filled with a dehydrating agent. The following liquids were used for contact angle measurements: doubly distilled and deionized water (W) from a Milli-Q system, diiodomethane (D) (Fluka AG, Switzerland), n-hexane (VEB Laborchemia Apolda, D.D.R.), n-heptane (Reachim, U.S.S.R.), n-octane (Fluka AG, Switzerland), n-nonane (Reachim,

Wetting of Teflon and its surface free energy

The obtained results of the contact angle measurements are shown in Fig. 1 from which it appears that there is a straight linear relationship between cos θ and surface tension of CTAB solution (γ) in the range of γ corresponding to a high concentration of CTAB. Deviation of the cos θ-γ curve from a straight line in the range of γ from 47 to 72.8 (at low CTAB concentration) is evident. The wetting curve up to γ equal to 69.2 mN/m is typical of those seen in the presence of surfactant additives

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RELATIONSHIP BETWEEN WETTING OF TEFLON BY CETYLTRIMETHYLAMMONIUM BROMIDE SOLUTION AND ADSORPTION

Abstract

Section snippets

INTRODUCTION

Materials

Wetting of Teflon and its surface free energy

Journal of Colloid and Interface Science

Journal of Colloid and Interface Science

Journal of Colloid and Interface Science

Colloid Surf.

IUPAC Chem. Data Ser.

Journal of Physical Chemistry

Journal of Physical Chemistry

Journal of Physical Chemistry