Interpolyelectrolyte Complex Dissociation vs Polyelectrolyte Desorption from Oppositely Charged Surface upon Salt Addition

2020 ◽  
Vol 124 (5) ◽  
pp. 914-920 ◽  
Author(s):  
Ivan V. Portnov ◽  
Igor I. Potemkin
Keyword(s):  
Charged Surface ◽  
Interpolyelectrolyte Complex ◽  
Salt Addition ◽  
Oppositely Charged

scholarly journals Solubilization of Charged Porphyrins in Interpolyelectrolyte Complexes: A Computer Study

Polymers ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 502
Author(s):  
Karel Šindelka ◽  
Zuzana Limpouchová ◽  
Karel Procházka
Keyword(s):  
Dissipative Particle Dynamics ◽  
Water Soluble ◽  
Coarse Grained ◽  
Core Shell ◽  
Computer Study ◽  
Interpolyelectrolyte Complex ◽  
The Core ◽  
Porphyrin Derivatives ◽  
Oppositely Charged ◽  
Positively Charged

Using coarse-grained dissipative particle dynamics (DPD) with explicit electrostatics, we performed (i) an extensive series of simulations of the electrostatic co-assembly of asymmetric oppositely charged copolymers composed of one (either positively or negatively charged) polyelectrolyte (PE) block A and one water-soluble block B and (ii) studied the solubilization of positively charged porphyrin derivatives (P+) in the interpolyelectrolyte complex (IPEC) cores of co-assembled nanoparticles. We studied the stoichiometric mixtures of 137 A10+B25 and 137 A10−B25 chains with moderately hydrophobic A blocks (DPD interaction parameter aAS=35) and hydrophilic B blocks (aBS=25) with 10 to 120 P+ added (aPS=39). The P+ interactions with other components were set to match literature information on their limited solubility and aggregation behavior. The study shows that the moderately soluble P+ molecules easily solubilize in IPEC cores, where they partly replace PE+ and electrostatically crosslink PE− blocks. As the large P+ rings are apt to aggregate, P+ molecules aggregate in IPEC cores. The aggregation, which starts at very low loadings, is promoted by increasing the number of P+ in the mixture. The positively charged copolymers repelled from the central part of IPEC core partially concentrate at the core-shell interface and partially escape into bulk solvent depending on the amount of P+ in the mixture and on their association number, AS. If AS is lower than the ensemble average ⟨AS⟩n, the copolymer chains released from IPEC preferentially concentrate at the core-shell interface, thus increasing AS, which approaches ⟨AS⟩n. If AS>⟨AS⟩n, they escape into the bulk solvent.

scholarly journals Theoretical and experimental adsorption studies of polyelectrolytes on an oppositely charged surface

1999 ◽  
Vol 110 (4) ◽  
pp. 2219-2225 ◽  
Author(s):  
Robert J. Mashl ◽  
Niels Gro/nbech-Jensen ◽  
M. R. Fitzsimmons ◽  
M. Lütt ◽  
DeQuan Li
Keyword(s):  
Charged Surface ◽  
Experimental Adsorption ◽  
Adsorption Studies ◽  
Oppositely Charged

scholarly journals Adsorption of polyelectrolytes onto the oppositely charged surface of tubular J-aggregates of a cyanine dye

2019 ◽  
Vol 297 (5) ◽  
pp. 729-739 ◽  
Author(s):  
Omar Al-Khatib ◽  
Christoph Böttcher ◽  
Hans von Berlepsch ◽  
Katherine Herman ◽  
Sebastian Schön ◽  
...  
Keyword(s):  
Cyanine Dye ◽  
Charged Surface ◽  
J Aggregates ◽  
Oppositely Charged

Pull-off of a polyelectrolyte chain from an oppositely charged surface

1998 ◽  
Vol 57 (6) ◽  
pp. 6923-6935 ◽  
Author(s):  
Xavier Châtellier ◽  
Jean-François Joanny
Keyword(s):  
Charged Surface ◽  
Polyelectrolyte Chain ◽  
Oppositely Charged

Adsorption of Polyelectrolytes at an Oppositely Charged Surface

2000 ◽  
Vol 84 (14) ◽  
pp. 3101-3104 ◽  
Author(s):  
Andrey V. Dobrynin ◽  
Alexander Deshkovski ◽  
Michael Rubinstein
Keyword(s):  
Charged Surface ◽  
Oppositely Charged

scholarly journals Preparation of Poly(acrylate)/Poly(diallyldimethylammonium) Coacervates without Small Counterions and Their Phase Behavior upon Salt Addition towards Poly-Ions Segregation

Polymers ◽  
2021 ◽  
Vol 13 (14) ◽  
pp. 2259
Author(s):  
Marcos Vinícius Aquino Queirós ◽  
Watson Loh
Keyword(s):  
Phase Behavior ◽  
Polyelectrolyte Complex ◽  
Inorganic Salts ◽  
Salt Addition ◽  
Segregation Phenomenon ◽  
Strong Segregation ◽  
Polymer Surfactant ◽  
Oppositely Charged ◽  
Segregative Phase Separation ◽  
Hofmann Elimination

In this work, we report the phase behavior of polyelectrolyte complex coacervates (PECs) of poly(acrylate) (PA−) and poly(diallyldimethylammonium) (PDADMA+) in the presence of inorganic salts. Titrations of the polyelectrolytes in their acidic and alkaline forms were performed to obtain the coacervates in the absence of their small counterions. This approach was previously applied to the preparation of polymer–surfactant complexes, and we demonstrate that it also succeeded in producing complexes free of small counterions with a low extent of Hofmann elimination. For phase behavior studies, two different molar masses of poly(acrylate) and two different salts were employed over a wide concentration range. It was possible to define the regions at which associative and segregative phase separation take place. The latter one was exploited in more details because the segregation phenomenon in mixtures of oppositely charged polyelectrolytes is scarcely reported. Phase composition analyses showed that there is a strong segregation for both PA− and PDADMA+, who are accompanied by their small counterions. These results demonstrate that the occurrence of poly-ion segregation in these mixtures depends on the anion involved: in this case, it was observed with NaCl, but not with Na2SO4.

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