AFM adhesion imaging for the comparison of polyelectrolyte complexes and polyelectrolyte multilayers

Soft Matter ◽  
2012 ◽  
Vol 8 (32) ◽  
pp. 8298 ◽  
Author(s):  
Caroline Ankerfors ◽  
Torbjörn Pettersson ◽  
Lars Wågberg
Keyword(s):  
Polyelectrolyte Multilayers ◽  
Polyelectrolyte Complexes

Linear versus Exponential Growth of Weak Polyelectrolyte Multilayers: Correlation with Polyelectrolyte Complexes

2012 ◽  
Vol 45 (9) ◽  
pp. 3892-3901 ◽  
Author(s):  
Li Xu ◽  
Denis Pristinski ◽  
Aliaksandr Zhuk ◽  
Chris Stoddart ◽  
John F. Ankner ◽  
...  
Keyword(s):  
Exponential Growth ◽  
Polyelectrolyte Multilayers ◽  
Polyelectrolyte Complexes

Where Polyelectrolyte Multilayers and Polyelectrolyte Complexes Meet

2006 ◽  
Vol 39 (26) ◽  
pp. 8873-8881 ◽  
Author(s):  
Svetlana A. Sukhishvili ◽  
Eugenia Kharlampieva ◽  
Vladimir Izumrudov
Keyword(s):  
Polyelectrolyte Multilayers ◽  
Polyelectrolyte Complexes

scholarly journals Ion-Specific and Solvent Effects on PDADMA–PSS Complexation and Multilayer Formation

2021 ◽  
Vol 5 (3) ◽  
pp. 38
Author(s):  
Jasmina Jukić ◽  
Karla Korade ◽  
Ana-Marija Milisav ◽  
Ida Delač Marion ◽  
Davor Kovačević
Keyword(s):  
Mole Fraction ◽  
Solvent Effects ◽  
Polyelectrolyte Multilayers ◽  
Polyelectrolyte Complexes ◽  
Ethanol Mixture ◽  
Force Microscopy ◽  
Atomic Force ◽  
Bromide Ions ◽  
The Difference ◽  
Multilayer Formation

Among various parameters that influence the formation of polyelectrolyte complexes and multilayers, special emphasis should be placed on ion-specific and solvent effects. In our study, we systematically examined the above-mentioned effects on poly(diallyldimethylammonium chloride) (PDADMACl)-sodium poly(4-styrenesulfonate) (NaPSS) complexation in solution and at the surface by means of dynamic light scattering, ellipsometry and atomic force microscopy measurements. As solvents, we used water and water/ethanol mixture. The obtained results confirm the importance of ion-specific and solvent effects on complexes prepared in solution, as well as on multilayers built up on a silica surface. The experiments in mixed solvent solution showed that at a higher ethanol mole fraction, the decrease in monomer titrant to titrand ratio, at which the increase in the size of complexes is observed, takes place. The difference between chloride and bromide ions was more pronounced at a higher mole fraction of ethanol and in the case of positive complex formation, suggesting that the larger amount of bromide ions could be condensed to the polycation chain. These findings are in accordance with the results we obtained for polyelectrolyte multilayers and could be helpful for designing polyelectrolyte multilayers with tuned properties needed for various applications, primarily in the field of biomedicine.

scholarly journals Patterned Microstructure Fabrication: Polyelectrolyte Complexes vs Polyelectrolyte Multilayers

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Meiyu Gai ◽  
Johannes Frueh ◽  
Valeriya L. Kudryavtseva ◽  
Rui Mao ◽  
Maxim V. Kiryukhin ◽  
...  
Keyword(s):  
Polyelectrolyte Multilayers ◽  
Polyelectrolyte Complexes ◽  
Microstructure Fabrication ◽  
Patterned Microstructure

Plasma Contact Activation and Decrease of Factor V Activity on Negatively-Charged Polyelectrolytes

1984 ◽  
Vol 51 (01) ◽  
pp. 061-064 ◽  
Author(s):  
M C Boffa ◽  
B Dreyer ◽  
C Pusineri
Keyword(s):  
Time Dependent ◽  
Initial Contact ◽  
Factor Xii ◽  
Factor V ◽  
Contact Activation ◽  
Polyelectrolyte Complexes ◽  
Plasma Factor ◽  
Fresh Plasma ◽  
Direct Adsorption

SummaryThe effect of negatively-charged polymers, used in some artificial devices, on plasma clotting and kinin systems was studied in vitro using polyelectrolyte complexes.Contact activation was observed as an immediate, transient and surface-dependent phenomenon. After incubation of the plasma with the polymer a small decrease of factor XII activity was noticed, which corresponded to a greater reduction of prekallikrein activity and to a marked kinin release. No significant decrease of factor XII, prekallikrein, HMW kininogen could be detected immunologically. Only the initial contact of the plasma with the polyelectrolyte lead to activation, subsequently the surface became inert.Beside contact activation, factor V activity also decreased in the plasma. The decrease was surface and time-dependent. It was independent of contact factor activation, and appeared to be related to the sulfonated groups of the polymer. If purified factor V was used instead of plasma factor V, inactivation was immediate and not time-dependent suggesting a direct adsorption on the surface. A second incubation of the plasma-contacted polymer with fresh plasma resulted in a further loss of Factor V activity.

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