Adsorption of dodecyl pyridinium chloride on monodisperse porous silica

M. Szekeres, I. Dékány, A. De Keizer

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

The adsorption of a cationic surfactant, dodecyl pyridinium chloride, on monodisperse Stober silica particles dispersed in an aqueous solution has been studied as a function of pH and electrolyte concentration. In a previous study it was concluded that the proton charges of these silica particles can be distinguished in charges on the outer surface, charges in the mesopores and charges in a microporous region. From a comparison with the adsorption on non-porous silica it was concluded that dodecyl pyridinium cations can penetrate the mesopores, but are excluded from the (highly charged) microporous region. On the outer surface, adsorption of the cationic surfactant leads to a maximum in the hydrophobicity at about 50% of the maximally adsorbed amount. Charge reversal has already taken place at about 10% of the plateau value. It was concluded that, after charge reversal, head-on adsorption proceeds until monolayer coverage, after which bilayer formation sets in.

Original languageEnglish
Pages (from-to)327-336
Number of pages10
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume141
Issue number3
DOIs
Publication statusPublished - Nov 15 1998

Fingerprint

Silicon Dioxide
chlorides
Silica
silicon dioxide
Adsorption
adsorption
Cationic surfactants
surfactants
Surface charge
Hydrophobicity
hydrophobicity
Electrolytes
Cations
Protons
Monolayers
plateaus
Positive ions
electrolytes
aqueous solutions
cations

Keywords

  • Adsorption
  • Cationic surfactant
  • Exclusion
  • Porosity
  • Silica
  • Surface charge

ASJC Scopus subject areas

  • Colloid and Surface Chemistry
  • Physical and Theoretical Chemistry

Cite this

Adsorption of dodecyl pyridinium chloride on monodisperse porous silica. / Szekeres, M.; Dékány, I.; De Keizer, A.

In: Colloids and Surfaces A: Physicochemical and Engineering Aspects, Vol. 141, No. 3, 15.11.1998, p. 327-336.

Research output: Contribution to journalArticle

@article{7293f6a2ef144bee9dee69cbde06214f,
title = "Adsorption of dodecyl pyridinium chloride on monodisperse porous silica",
abstract = "The adsorption of a cationic surfactant, dodecyl pyridinium chloride, on monodisperse Stober silica particles dispersed in an aqueous solution has been studied as a function of pH and electrolyte concentration. In a previous study it was concluded that the proton charges of these silica particles can be distinguished in charges on the outer surface, charges in the mesopores and charges in a microporous region. From a comparison with the adsorption on non-porous silica it was concluded that dodecyl pyridinium cations can penetrate the mesopores, but are excluded from the (highly charged) microporous region. On the outer surface, adsorption of the cationic surfactant leads to a maximum in the hydrophobicity at about 50{\%} of the maximally adsorbed amount. Charge reversal has already taken place at about 10{\%} of the plateau value. It was concluded that, after charge reversal, head-on adsorption proceeds until monolayer coverage, after which bilayer formation sets in.",
keywords = "Adsorption, Cationic surfactant, Exclusion, Porosity, Silica, Surface charge",
author = "M. Szekeres and I. D{\'e}k{\'a}ny and {De Keizer}, A.",
year = "1998",
month = "11",
day = "15",
doi = "10.1016/S0927-7757(97)00116-7",
language = "English",
volume = "141",
pages = "327--336",
journal = "Colloids and Surfaces A: Physicochemical and Engineering Aspects",
issn = "0927-7757",
publisher = "Elsevier",
number = "3",

}

TY - JOUR

T1 - Adsorption of dodecyl pyridinium chloride on monodisperse porous silica

AU - Szekeres, M.

AU - Dékány, I.

AU - De Keizer, A.

PY - 1998/11/15

Y1 - 1998/11/15

N2 - The adsorption of a cationic surfactant, dodecyl pyridinium chloride, on monodisperse Stober silica particles dispersed in an aqueous solution has been studied as a function of pH and electrolyte concentration. In a previous study it was concluded that the proton charges of these silica particles can be distinguished in charges on the outer surface, charges in the mesopores and charges in a microporous region. From a comparison with the adsorption on non-porous silica it was concluded that dodecyl pyridinium cations can penetrate the mesopores, but are excluded from the (highly charged) microporous region. On the outer surface, adsorption of the cationic surfactant leads to a maximum in the hydrophobicity at about 50% of the maximally adsorbed amount. Charge reversal has already taken place at about 10% of the plateau value. It was concluded that, after charge reversal, head-on adsorption proceeds until monolayer coverage, after which bilayer formation sets in.

AB - The adsorption of a cationic surfactant, dodecyl pyridinium chloride, on monodisperse Stober silica particles dispersed in an aqueous solution has been studied as a function of pH and electrolyte concentration. In a previous study it was concluded that the proton charges of these silica particles can be distinguished in charges on the outer surface, charges in the mesopores and charges in a microporous region. From a comparison with the adsorption on non-porous silica it was concluded that dodecyl pyridinium cations can penetrate the mesopores, but are excluded from the (highly charged) microporous region. On the outer surface, adsorption of the cationic surfactant leads to a maximum in the hydrophobicity at about 50% of the maximally adsorbed amount. Charge reversal has already taken place at about 10% of the plateau value. It was concluded that, after charge reversal, head-on adsorption proceeds until monolayer coverage, after which bilayer formation sets in.

KW - Adsorption

KW - Cationic surfactant

KW - Exclusion

KW - Porosity

KW - Silica

KW - Surface charge

UR - http://www.scopus.com/inward/record.url?scp=0032533156&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0032533156&partnerID=8YFLogxK

U2 - 10.1016/S0927-7757(97)00116-7

DO - 10.1016/S0927-7757(97)00116-7

M3 - Article

AN - SCOPUS:0032533156

VL - 141

SP - 327

EP - 336

JO - Colloids and Surfaces A: Physicochemical and Engineering Aspects

JF - Colloids and Surfaces A: Physicochemical and Engineering Aspects

SN - 0927-7757

IS - 3

ER -