Adsorption of complexes formed by cationic starch and anionic surfactants on quartz studied by QCM-D

J Merta, T Tammelin, P Stenius

Research output: Contribution to journalArticleScientificpeer-review

28 Citations (Scopus)

Abstract

The adsorption of complexes of cationic starch, (CS) and a series of homologous sodium alkanoates on silica was studied with the quartz crystal microbalance with dissipation (QCM-D) instrument. The systems were chosen so as to represent CS/surfactant ratios below and above the critical association concentrations of the surfactants but below their critical micelle concentrations. It was found that
–surfactants did not adsorb on cationic polymers that were very tightly bound to the surface;
–surfactants did adsorb on polyelectrolytes forming layers with loops and tails extending into the solution, provided the concentration of surfactant was at least around the critical association concentration (cac) of the surfactant/polymer system;
–adsorption of surfactant was promoted by increasing the surfactant chain length and by adding simple electrolyte that weakened the electrostatic polymer/surface interaction and
–multilayers were formed when the surfactant concentration in solution was well above the cac; their formation was promoted by increasing hydrophobic interactions, e.g. by increasing the surfactant chain length.
Original languageEnglish
Pages (from-to)103-114
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume250
Issue number1-3
DOIs
Publication statusPublished - Dec 2004
MoE publication typeNot Eligible

Fingerprint

Quartz
starches
Anionic surfactants
Quartz crystal microbalances
quartz crystals
Starch
Surface-Active Agents
microbalances
Surface active agents
dissipation
quartz
surfactants
Adsorption
adsorption
Polymers
Chain length
polymers
Critical micelle concentration
Polyelectrolytes
Silicon Dioxide

Keywords

  • adsorption
  • cationic starch
  • surfactant
  • quartz crystal microbalance
  • viscoelasticity

Cite this

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title = "Adsorption of complexes formed by cationic starch and anionic surfactants on quartz studied by QCM-D",
abstract = "The adsorption of complexes of cationic starch, (CS) and a series of homologous sodium alkanoates on silica was studied with the quartz crystal microbalance with dissipation (QCM-D) instrument. The systems were chosen so as to represent CS/surfactant ratios below and above the critical association concentrations of the surfactants but below their critical micelle concentrations. It was found that–surfactants did not adsorb on cationic polymers that were very tightly bound to the surface;–surfactants did adsorb on polyelectrolytes forming layers with loops and tails extending into the solution, provided the concentration of surfactant was at least around the critical association concentration (cac) of the surfactant/polymer system;–adsorption of surfactant was promoted by increasing the surfactant chain length and by adding simple electrolyte that weakened the electrostatic polymer/surface interaction and–multilayers were formed when the surfactant concentration in solution was well above the cac; their formation was promoted by increasing hydrophobic interactions, e.g. by increasing the surfactant chain length.",
keywords = "adsorption, cationic starch, surfactant, quartz crystal microbalance, viscoelasticity",
author = "J Merta and T Tammelin and P Stenius",
year = "2004",
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doi = "10.1016/j.colsurfa.2004.08.032",
language = "English",
volume = "250",
pages = "103--114",
journal = "Colloids and Surfaces A: Physicochemical and Engineering Aspects",
issn = "0927-7757",
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Adsorption of complexes formed by cationic starch and anionic surfactants on quartz studied by QCM-D. / Merta, J; Tammelin, T; Stenius, P.

In: Colloids and Surfaces A: Physicochemical and Engineering Aspects, Vol. 250, No. 1-3, 12.2004, p. 103-114.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Adsorption of complexes formed by cationic starch and anionic surfactants on quartz studied by QCM-D

AU - Merta, J

AU - Tammelin, T

AU - Stenius, P

PY - 2004/12

Y1 - 2004/12

N2 - The adsorption of complexes of cationic starch, (CS) and a series of homologous sodium alkanoates on silica was studied with the quartz crystal microbalance with dissipation (QCM-D) instrument. The systems were chosen so as to represent CS/surfactant ratios below and above the critical association concentrations of the surfactants but below their critical micelle concentrations. It was found that–surfactants did not adsorb on cationic polymers that were very tightly bound to the surface;–surfactants did adsorb on polyelectrolytes forming layers with loops and tails extending into the solution, provided the concentration of surfactant was at least around the critical association concentration (cac) of the surfactant/polymer system;–adsorption of surfactant was promoted by increasing the surfactant chain length and by adding simple electrolyte that weakened the electrostatic polymer/surface interaction and–multilayers were formed when the surfactant concentration in solution was well above the cac; their formation was promoted by increasing hydrophobic interactions, e.g. by increasing the surfactant chain length.

AB - The adsorption of complexes of cationic starch, (CS) and a series of homologous sodium alkanoates on silica was studied with the quartz crystal microbalance with dissipation (QCM-D) instrument. The systems were chosen so as to represent CS/surfactant ratios below and above the critical association concentrations of the surfactants but below their critical micelle concentrations. It was found that–surfactants did not adsorb on cationic polymers that were very tightly bound to the surface;–surfactants did adsorb on polyelectrolytes forming layers with loops and tails extending into the solution, provided the concentration of surfactant was at least around the critical association concentration (cac) of the surfactant/polymer system;–adsorption of surfactant was promoted by increasing the surfactant chain length and by adding simple electrolyte that weakened the electrostatic polymer/surface interaction and–multilayers were formed when the surfactant concentration in solution was well above the cac; their formation was promoted by increasing hydrophobic interactions, e.g. by increasing the surfactant chain length.

KW - adsorption

KW - cationic starch

KW - surfactant

KW - quartz crystal microbalance

KW - viscoelasticity

U2 - 10.1016/j.colsurfa.2004.08.032

DO - 10.1016/j.colsurfa.2004.08.032

M3 - Article

VL - 250

SP - 103

EP - 114

JO - Colloids and Surfaces A: Physicochemical and Engineering Aspects

JF - Colloids and Surfaces A: Physicochemical and Engineering Aspects

SN - 0927-7757

IS - 1-3

ER -