A1 Refereed original research article in a scientific journal
Modeling the growth processes of polyelectrolyte multilayers using a quartz crystal resonator
Authors: Salomaki M, Kankare J
Publisher: AMER CHEMICAL SOC
Publication year: 2007
Journal:: Journal of Physical Chemistry B
Journal name in source: JOURNAL OF PHYSICAL CHEMISTRY B
Journal acronym: J PHYS CHEM B
Volume: 111
Issue: 29
First page : 8509
Last page: 8519
Number of pages: 11
ISSN: 1520-6106
DOI: https://doi.org/10.1021/jp067344h
Abstract
The layer-by-layer buildup of chitosan/hyaluronan (CH/HA) and poly(L-lysine)/hyaluronan (PLL/HA) multilayers was followed on a quartz crystal resonator (QCR) in different ionic strengths and at different temperatures. These polyelectrolytes were chosen to demonstrate the method whereby useful information is retrieved from acoustically thick polymer layers during their buildup. Surface acoustic impedance recorded in these measurements gives a single or double spiral when plotted in the complex plane. The shape of this spiral depends on the viscoelasticity of the layer material and regularity of the growth process. The polymer layer is assumed to consist of one or two zones. A mathematical model was devised to represent the separation of the layer to two zones with different viscoelastic properties. Viscoelastic quantities of the layer material and the mode and parameters of the growth process were acquired by fitting a spiral to the experimental data. In all the cases the growth process was mainly exponential as a function of deposition cycles, the growth exponent being between 0.250 and 0.275.
The layer-by-layer buildup of chitosan/hyaluronan (CH/HA) and poly(L-lysine)/hyaluronan (PLL/HA) multilayers was followed on a quartz crystal resonator (QCR) in different ionic strengths and at different temperatures. These polyelectrolytes were chosen to demonstrate the method whereby useful information is retrieved from acoustically thick polymer layers during their buildup. Surface acoustic impedance recorded in these measurements gives a single or double spiral when plotted in the complex plane. The shape of this spiral depends on the viscoelasticity of the layer material and regularity of the growth process. The polymer layer is assumed to consist of one or two zones. A mathematical model was devised to represent the separation of the layer to two zones with different viscoelastic properties. Viscoelastic quantities of the layer material and the mode and parameters of the growth process were acquired by fitting a spiral to the experimental data. In all the cases the growth process was mainly exponential as a function of deposition cycles, the growth exponent being between 0.250 and 0.275.
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