Viscoelastic properties of cationic starch adsorbed on quartz studied by QCM-D

T Tammelin, J Merta, LS Johansson, P Stenius

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

The adsorption and viscoelastic properties of layers of a cationic polyelectrolyte (cationic starch, CS, with 2-hydroxy-3-trimethylammoniumchloride as the substituent) adsorbed from aqueous solutions (pH 7.5, added NaCl 0, 1, 100, and 500 mM) on silica were studied with a quartz crystal microbalance with dissipation (QCM-D). Three different starches were investigated (weight-average molecular weights Mw ≈ 8.7 × 105 and 4.5 × 105 with degree of substitution DS = 0.75 and Mw ≈ 8.8 × 105 with DS = 0.2). At low ionic strength, the adsorbed layers are thin and rigid and the amount adsorbed can be calculated using the Sauerbrey equation. When the ionic strength is increased, significant changes take place in the amount of adsorbed CS and the viscoelasticity of the adsorbed layer. These changes were analyzed assuming that the layer can be described as a Voigt element on a rigid surface in contact with purely viscous solvent. It was found that CS with low charge density forms a thicker and more mobile layer with higher viscosity and elasticity than CS with high charge density. The polymers adsorbed on the silica even when the ionic strength was so high that electrostatic interactions were effectively screened. At this high ionic strength, it was possible to study the effect of molecular weight and molecular weight distribution of the CS on the properties of the adsorbed film. Increasing the molecular weight of CS resulted in a larger hydrodynamic thickness. CS with a narrow molecular weight distribution formed a more compact and rigid layer than broadly distributed CS, presumably due to the better packing of the molecules.
Original languageEnglish
Pages (from-to)10900–10909
JournalLangmuir
Volume20
Issue number25
DOIs
Publication statusPublished - 2004
MoE publication typeNot Eligible

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Quartz
starches
Quartz crystal microbalances
Ionic strength
quartz crystals
Starch
microbalances
dissipation
quartz
molecular weight
Molecular weight
Molecular weight distribution
Charge density
Silicon Dioxide
Silica
Viscoelasticity
Coulomb interactions
Polyelectrolytes
silicon dioxide
Elasticity

Cite this

Tammelin, T ; Merta, J ; Johansson, LS ; Stenius, P. / Viscoelastic properties of cationic starch adsorbed on quartz studied by QCM-D. In: Langmuir. 2004 ; Vol. 20, No. 25. pp. 10900–10909.
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abstract = "The adsorption and viscoelastic properties of layers of a cationic polyelectrolyte (cationic starch, CS, with 2-hydroxy-3-trimethylammoniumchloride as the substituent) adsorbed from aqueous solutions (pH 7.5, added NaCl 0, 1, 100, and 500 mM) on silica were studied with a quartz crystal microbalance with dissipation (QCM-D). Three different starches were investigated (weight-average molecular weights Mw ≈ 8.7 × 105 and 4.5 × 105 with degree of substitution DS = 0.75 and Mw ≈ 8.8 × 105 with DS = 0.2). At low ionic strength, the adsorbed layers are thin and rigid and the amount adsorbed can be calculated using the Sauerbrey equation. When the ionic strength is increased, significant changes take place in the amount of adsorbed CS and the viscoelasticity of the adsorbed layer. These changes were analyzed assuming that the layer can be described as a Voigt element on a rigid surface in contact with purely viscous solvent. It was found that CS with low charge density forms a thicker and more mobile layer with higher viscosity and elasticity than CS with high charge density. The polymers adsorbed on the silica even when the ionic strength was so high that electrostatic interactions were effectively screened. At this high ionic strength, it was possible to study the effect of molecular weight and molecular weight distribution of the CS on the properties of the adsorbed film. Increasing the molecular weight of CS resulted in a larger hydrodynamic thickness. CS with a narrow molecular weight distribution formed a more compact and rigid layer than broadly distributed CS, presumably due to the better packing of the molecules.",
author = "T Tammelin and J Merta and LS Johansson and P Stenius",
year = "2004",
doi = "10.1021/la0487693",
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Tammelin, T, Merta, J, Johansson, LS & Stenius, P 2004, 'Viscoelastic properties of cationic starch adsorbed on quartz studied by QCM-D', Langmuir, vol. 20, no. 25, pp. 10900–10909. https://doi.org/10.1021/la0487693

Viscoelastic properties of cationic starch adsorbed on quartz studied by QCM-D. / Tammelin, T; Merta, J; Johansson, LS; Stenius, P.

In: Langmuir, Vol. 20, No. 25, 2004, p. 10900–10909.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Viscoelastic properties of cationic starch adsorbed on quartz studied by QCM-D

AU - Tammelin, T

AU - Merta, J

AU - Johansson, LS

AU - Stenius, P

PY - 2004

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N2 - The adsorption and viscoelastic properties of layers of a cationic polyelectrolyte (cationic starch, CS, with 2-hydroxy-3-trimethylammoniumchloride as the substituent) adsorbed from aqueous solutions (pH 7.5, added NaCl 0, 1, 100, and 500 mM) on silica were studied with a quartz crystal microbalance with dissipation (QCM-D). Three different starches were investigated (weight-average molecular weights Mw ≈ 8.7 × 105 and 4.5 × 105 with degree of substitution DS = 0.75 and Mw ≈ 8.8 × 105 with DS = 0.2). At low ionic strength, the adsorbed layers are thin and rigid and the amount adsorbed can be calculated using the Sauerbrey equation. When the ionic strength is increased, significant changes take place in the amount of adsorbed CS and the viscoelasticity of the adsorbed layer. These changes were analyzed assuming that the layer can be described as a Voigt element on a rigid surface in contact with purely viscous solvent. It was found that CS with low charge density forms a thicker and more mobile layer with higher viscosity and elasticity than CS with high charge density. The polymers adsorbed on the silica even when the ionic strength was so high that electrostatic interactions were effectively screened. At this high ionic strength, it was possible to study the effect of molecular weight and molecular weight distribution of the CS on the properties of the adsorbed film. Increasing the molecular weight of CS resulted in a larger hydrodynamic thickness. CS with a narrow molecular weight distribution formed a more compact and rigid layer than broadly distributed CS, presumably due to the better packing of the molecules.

AB - The adsorption and viscoelastic properties of layers of a cationic polyelectrolyte (cationic starch, CS, with 2-hydroxy-3-trimethylammoniumchloride as the substituent) adsorbed from aqueous solutions (pH 7.5, added NaCl 0, 1, 100, and 500 mM) on silica were studied with a quartz crystal microbalance with dissipation (QCM-D). Three different starches were investigated (weight-average molecular weights Mw ≈ 8.7 × 105 and 4.5 × 105 with degree of substitution DS = 0.75 and Mw ≈ 8.8 × 105 with DS = 0.2). At low ionic strength, the adsorbed layers are thin and rigid and the amount adsorbed can be calculated using the Sauerbrey equation. When the ionic strength is increased, significant changes take place in the amount of adsorbed CS and the viscoelasticity of the adsorbed layer. These changes were analyzed assuming that the layer can be described as a Voigt element on a rigid surface in contact with purely viscous solvent. It was found that CS with low charge density forms a thicker and more mobile layer with higher viscosity and elasticity than CS with high charge density. The polymers adsorbed on the silica even when the ionic strength was so high that electrostatic interactions were effectively screened. At this high ionic strength, it was possible to study the effect of molecular weight and molecular weight distribution of the CS on the properties of the adsorbed film. Increasing the molecular weight of CS resulted in a larger hydrodynamic thickness. CS with a narrow molecular weight distribution formed a more compact and rigid layer than broadly distributed CS, presumably due to the better packing of the molecules.

U2 - 10.1021/la0487693

DO - 10.1021/la0487693

M3 - Article

VL - 20

SP - 10900

EP - 10909

JO - Langmuir

JF - Langmuir

SN - 0743-7463

IS - 25

ER -