Polyelectrolyte Multilayers on Silica Surfaces: Effect of Ionic Strength and Sodium Salt Type

Salopek, Jasmina; Sadžak, Anja; Kuzman, Dino; Požar, Josip; Kovačević, Davor

doi:10.5562/cca3179

Cited by 6 publications

(5 citation statements)

References 28 publications

(35 reference statements)

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“…In addition to the PAH/PAA pair, the overcharging of primary PECs achieved by abrupt titrant addition in excess was previously observed by DLS and electrophoretic methods in the case of PDADMAC-PSS and PAH-PSS pairs . It, therefore, seems that the phenomenon of charge inversion of primary polyelectrolyte complexes is universal, just like the surface charge inversion that occurs during the deposition of each polyelectrolyte layer in the process of preparing polyelectrolyte multilayers (PEMs). − The described results are the additional strong evidence of the already observed correlation between the process of interpolyelectrolyte complexation in solution and the formation of PEMs on the surface.…”

Section: Resultssupporting

confidence: 57%

High-Resolution Ultrasonic Spectroscopy: Looking at the Interpolyelectrolyte Neutralization from a Different Perspective

et al. 2023

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In this study, the high-resolution ultrasonic spectroscopy (HR-US) technique was applied to examine interpolyelectrolyte neutralization. The mentioned method was tested on the example of complexation between poly(allylammonium) cations and poly(acrylate) anions in aqueous solutions at pH = 7. It was confirmed by HR-US that the type of titration (stepwise or abrupt), the direction of titration, and the type of background salt affect the outcome of interpolyelectrolyte neutralization. The obtained results were explained on the basis of ultrasonic velocity and attenuation changes in the context of suspension compressibility, a parameter that is extremely sensitive to molecular organization and intermolecular interactions. Moreover, the results of HR-US measurements proved to be consistent with previous results obtained by more traditional methods such as dynamic light scattering, microcalorimetry, and electrokinetics. This research demonstrates that HR-US is a convenient and reliable method that can be employed for the investigation of interpolyelectrolyte neutralization and polyelectrolyte-related processes.

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Section: Resultssupporting

confidence: 57%

High-Resolution Ultrasonic Spectroscopy: Looking at the Interpolyelectrolyte Neutralization from a Different Perspective

et al. 2023

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“…As stated in the Introduction, the aim of this study was to extend our investigations on polyelectrolyte multilayer-modified surfaces [14,15] to the standard PVC catheter surfaces coated with PDADMA/PSS multilayers [17] in order to find a way to reduce bacterial adhesion on catheter surfaces. For that purpose, we use uropathogenic E. coli as the bacteria of interest.…”

Section: Discussionmentioning

confidence: 99%

“…As oppositely-charged polyelectrolytes, we used poly(diallyldimethylammonium chloride) (PDADMA) and poly(sodium 4-styrenesulfonate) (PSS). These synthetic polyelectrolytes have been widely used in the process of polyelectrolyte multilayer formation [16][17][18]. The surfaces were additionally characterized by measuring the roughness and hydrophobicity.…”

Section: Introductionmentioning

confidence: 99%

Bacterial Adhesion Capacity of Uropathogenic Escherichia coli to Polyelectrolyte Multilayer Coated Urinary Catheter Surface

et al. 2021

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The application of catheters to the urinary tract is associated with nosocomial infections. Such infections are one of the most common types of infections in hospitals and health care facilities and can lead to numerous medical complications. Therefore, the understanding of the properties of urinary catheter surfaces and their potential modifications are crucial in order to reduce bacterial adhesion and subsequent biofilm formation. In our study, we consider standard polyvinyl chloride (PVC) catheter surfaces and compare their properties with the properties of the same surfaces coated with poly(diallyldimethylammonium chloride)/poly(sodium 4-styrenesulfonate) (PDADMA/PSS) polyelectrolyte multilayers. Uncoated and coated surfaces were characterized by means of roughness, hydrophobicity, and zeta potential measurements. Finally, bacterial adhesion extent of uropathogenic Escherichia coli on bare and polyelectrolyte multilayer coated surfaces was measured. The obtained results show that on non-treated surfaces, biofilm is formed which was not the case for multilayer coated surfaces. The PSS-terminated multilayer shows the lowest bacterial adhesion and could be helpful in prevention of biofilm formation. The analysis of the properties of the uncoated and coated surfaces reveals that the most significant difference is related to the charge (i.e., zeta potential) of the examined surfaces, while roughness and hydrophobicity of the examined surfaces are similar. Therefore, it could be concluded that the surface charge plays the crucial role in the bacterial adhesion on uncoated and coated PVC catheter surfaces.

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“…Besides the mentioned factors, the type of background salt also plays an important role in multilayer formation. ,− Dubas and Schlenoff were among the first to observe that the thickness of LbL films depends on the cation and anion present in polyelectrolyte assembly solutions. They deposited 10 bilayers of sodium polystyrene sulfonate (PSS) and polydiallyldimethylammonium chloride (PDADMAC) on the silicon surface.…”

Section: Introductionmentioning

confidence: 99%

Suppressing the Hofmeister Anion Effect by Thermal Annealing of Thin-Film Multilayers Made of Weak Polyelectrolytes

2022

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Thin films made of weak polyelectrolytes poly(allylamine hydrochloride) (PAH) and poly(acrylic acid) (PAA) have been fabricated on silicon wafers using the layer-by-layer (LbL) method. To study the influence of counteranion type on the growth and properties of PAH/PAA multilayers, the nature of the supporting sodium salt was varied from cosmotropic to chaotropic anions (F–, Cl–, and ClO4 –). Results of ellipsometry and AFM measurements indicate that the film thickness and surface roughness systematically increase on the order F– < Cl– < ClO4 –. Furthermore, we found that the hydrophobicity of the PAH/PAA multilayer also follows the described trend when a polycation is the terminating layer. However, the heating of PAH/PAA multilayers to 60 °C during the LbL assembly suppressed the influence of background anions on the multilayer formation and properties. On the basis of the obtained results, it could be concluded that thermal annealing induces changes at the polymer–air interface in the sense of reorientation and migration of polymer chains.

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Polyelectrolyte Multilayers on Silica Surfaces: Effect of Ionic Strength and Sodium Salt Type

Cited by 6 publications

References 28 publications

High-Resolution Ultrasonic Spectroscopy: Looking at the Interpolyelectrolyte Neutralization from a Different Perspective

High-Resolution Ultrasonic Spectroscopy: Looking at the Interpolyelectrolyte Neutralization from a Different Perspective

Bacterial Adhesion Capacity of Uropathogenic Escherichia coli to Polyelectrolyte Multilayer Coated Urinary Catheter Surface

Suppressing the Hofmeister Anion Effect by Thermal Annealing of Thin-Film Multilayers Made of Weak Polyelectrolytes

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