Temperature-Induced Transition from Odd–Even to Even–Odd Effect in Polyelectrolyte Multilayers Due to Interpolyelectrolyte Interactions

Nestler, Peter; Block, Stephan; Helm, Christiane A.

doi:10.1021/jp208837m

Cited by 30 publications

(25 citation statements)

References 35 publications

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“…6 shows the thickness change, Δ h op , for the adsorption of each layer for wet multilayers (PDADMAC + PSS) N under different assembly conditions (linear and non-linear growth). They show a clear odd–even effect in the successive adsorption cycles [ 19 , 54 ]. These results confirm the dependence on the ionic strength of the adsorbed amount of PDADMAC discussed above (the change from 0.10 M to 0.50 M leads to a thickening of the PDADMAC layers by a factor of six), whereas the adsorption of PSS does not show any significant change.…”

Section: Resultsmentioning

confidence: 99%

3D solid supported inter-polyelectrolyte complexes obtained by the alternate deposition of poly(diallyldimethylammonium chloride) and poly(sodium 4-styrenesulfonate)

Guzmán¹,

Maestro²,

Llamas³

et al. 2016

Beilstein J. Nanotechnol.

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SummaryThis work addresses the formation and the internal morphology of polyelectrolyte layers obtained by the layer-by-layer method. A multimodal characterization showed the absence of stratification of the films formed by the alternate deposition of poly(diallyldimethylammonium chloride) and poly(sodium 4-styrenesulfonate). Indeed the final organization might be regarded as three-dimensional solid-supported inter-polyelectrolyte films. The growth mechanism of the multilayers, followed using a quartz crystal microbalance, evidences two different growth trends, which show a dependency on the ionic strength due to its influence onto the polymer conformation. The hydration state does not modify the multilayer growth, but it contributes to the total adsorbed mass of the film. The water associated with the polyelectrolyte films leads to their swelling and plastification. The use of X-ray photoelectron spectroscopy has allowed for deeper insights on the internal structure and composition of the polyelectrolyte multilayers.

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Section: Resultsmentioning

confidence: 99%

3D solid supported inter-polyelectrolyte complexes obtained by the alternate deposition of poly(diallyldimethylammonium chloride) and poly(sodium 4-styrenesulfonate)

Guzmán¹,

Maestro²,

Llamas³

et al. 2016

Beilstein J. Nanotechnol.

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“…Additionally, uncoated samples were measured and served as a reference. Each measurement was carried out at several angles of incidence (50 • −80 • in 1 • steps) in two different ellipsometric zones (Nestler et al, 2012).…”

Section: Layer Thicknessmentioning

confidence: 99%

Enhancement of Intracellular Calcium Ion Mobilization by Moderately but Not Highly Positive Material Surface Charges

Gruening

Neuber

Nestler

et al. 2020

Front. Bioeng. Biotechnol.

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Electrostatic forces at the cell interface affect the nature of cell adhesion and function; but there is still limited knowledge about the impact of positive or negative surface charges on cell-material interactions in regenerative medicine. Titanium surfaces with a variety of zeta potentials between −90 mV and +50 mV were generated by functionalizing them with amino polymers, extracellular matrix proteins/peptide motifs and polyelectrolyte multilayers. A significant enhancement of intracellular calcium mobilization was achieved on surfaces with a moderately positive (+1 to +10 mV) compared with a negative zeta potential (−90 to −3 mV). Dramatic losses of cell activity (membrane integrity, viability, proliferation, calcium mobilization) were observed on surfaces with a highly positive zeta potential (+50 mV). This systematic study indicates that cells do not prefer positive charges in general, merely moderately positive ones. The cell behavior of MG-63s could be correlated with the materials' zeta potential; but not with water contact angle or surface free energy. Our findings present new insights and provide an essential knowledge for future applications in dental and orthopedic surgery.

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“…10,15,22 Filling of the voids with water during the swelling process would only affect the optical properties. These three phenomena, the local gradient in swelling, 9,14,17 the odd−even effect, 9,20,21 and the amount of void water, 10,15,22 have been investigated separately in previous studies. However, investigations about their mutual influence are missing.…”

Section: ■ Introductionmentioning

confidence: 99%

Swelling of Polyelectrolyte Multilayers: The Relation Between, Surface and Bulk Characteristics

2015

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The odd-even effect, i.e., the influence of the outermost layer of polyelectrolyte multilayers (PEMs) on their swelling behavior, is investigated. For that purpose poly(styrene sodium sulfonate) (PSS)/poly(diallyl-dimethylammonium chloride) (PDADMAC) polyelectrolyte multilayers are studied in air with 1% relative humidity (RH), 30% RH, 95% RH, and in liquid water by ellipsometry, atomic force microscopy (AFM), and X-ray reflectometry (XRR). Since the total amount of water uptake in swollen PEMs is divided into two fractions, the void water and the swelling water, a correct evaluation of the odd-even effect is only possible if both fractions are examined separately. In order to allow measuring samples over a larger thickness regime the investigation of a larger amount of samples is required. Therefore, the concept of separating void water from swelling water using neutron reflectometry is for the first time transferred to ellipsometry. The subsequent analysis of swelling water, void water, and roughness revealed the existence of two types of odd-even effects: an odd-even effect which addresses only the surface of the PEM (surface-odd-even effect) and an odd-even effect which addresses also the bulk of the PEM (bulk-odd-even effect). The appearance of both effects is dependent on the environment; the surface-odd-even effect is only detectable in humid air while the bulk-odd-even effect is only detectable in liquid water. The bulk-odd-even effect is related to the osmotic pressure between the PEM and the surrounding water. A correlation between the amount of void water and both odd-even effects is not found. The amount of void water is independent of the terminated layer and the thickness of PEMs.

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Temperature-Induced Transition from Odd–Even to Even–Odd Effect in Polyelectrolyte Multilayers Due to Interpolyelectrolyte Interactions

Cited by 30 publications

References 35 publications

3D solid supported inter-polyelectrolyte complexes obtained by the alternate deposition of poly(diallyldimethylammonium chloride) and poly(sodium 4-styrenesulfonate)

3D solid supported inter-polyelectrolyte complexes obtained by the alternate deposition of poly(diallyldimethylammonium chloride) and poly(sodium 4-styrenesulfonate)

Enhancement of Intracellular Calcium Ion Mobilization by Moderately but Not Highly Positive Material Surface Charges

Swelling of Polyelectrolyte Multilayers: The Relation Between, Surface and Bulk Characteristics

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