Behavior of block-polyampholytes near a charged surface

Messina, René

doi:10.1140/epje/e2007-00041-x

Cited by 9 publications

(12 citation statements)

References 24 publications

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“…The particle size was also found an important parameter for large particles, where the surface becomes large enough to adsorb the whole amphoteric chain. Concerning a planar charged surface instead of a spherical particle, several groups 35,36 found results that confirm experimental and theoretical data; i.e., the PA adsorption occurs when the local attraction with the surface becomes stronger than the net charge repulsion. Consequently, short PA chains remain in bulk while chain entropy is stronger than chain polarizability, and the adsorption process increases with the PA length, PA block size, and surface charge.…”

Section: Introductionsupporting

confidence: 60%

Formation of Complexes between Nanoparticles and Weak Polyampholyte Chains. Monte Carlo Simulations

et al. 2011

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The electrostatic driven complex formation between a weak polyampholyte chain and one positively charged nanoparticle is investigated using Monte Carlo simulations. The influence of parameters such as the polyampholyte contour length, number and size of blocks, nanoparticle surface charge density, and solution properties, such as the pH and ionic concentration, on the PA titration curves is investigated. It is shown that the presence of one positively charged nanoparticle significantly modifies the acid/base properties of the weak polyampholyte by, on the one hand, promoting the formation of negatively charged monomers and, on the other hand, limiting the number of positively charged monomers. The electrostatic interactions of this system can be modified by pH, ionic concentration, and nanoparticle surface charge. The competition between attractive and repulsive, intramolecular and intermolecular electrostatic interactions leads to a wide range of possible PA conformations at the nanoparticle surface, which have a direct impact on the nanoparticle stabilized or destabilized solutions. Extended conformations, electrostatic rosettes, and dense multiplayer structures are observed. Nonetheless, the intramolecular interactions between the positively and negatively charged PA monomers, in particular at the isoelectric point, are found to play important and subtle roles for both the isolated and adsorbed chain conformations. It is also found that nanoparticle charge inversion is an important ingredient for the formation of multilayer structures at the nanoparticle surface.

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Section: Introductionsupporting

confidence: 60%

Formation of Complexes between Nanoparticles and Weak Polyampholyte Chains. Monte Carlo Simulations

et al. 2011

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“…For example, it has been shown that the sequence of charged amino acids (charge distribution) along ionically complementary peptides affect the aggregation behavior and self-assembling process in the solution of such peptides [1,2]. Also, using Monte Carlo simulations it has been shown that charged monomers sequence of neutral block-polyampholytes affect their adsorption properties to a charged surface [3].…”

Section: Introductionmentioning

confidence: 99%

Molecular dynamics simulation of semiflexible polyampholyte brushes--The effect of charged monomers sequence

Baratlo

Fazli

2009

Eur. Phys. J. E

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Planar brushes formed by end-grafted semiflexible polyampholyte chains, each chain containing equal number of positively and negatively charged monomers is studied using molecular dynamics simulations. Keeping the length of the chains fixed, dependence of the average brush thickness and equilibrium statistics of the brush conformations on the grafting density and the salt concentration are obtained with various sequences of charged monomers. When similarly charged monomers of the chains are arranged in longer blocks, the average brush thickness is smaller and dependence of brush properties on the grafting density and the salt concentration is stronger. With such long blocks of similarly charged monomers, the anchored chains bond to each other in the vicinity of the grafting surface at low grafting densities and buckle toward the grafting surface at high grafting densities.

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“…For salinity conditions where the polymer is free in solution, the normal radius of gyration decreases for polymers with larger blocks, in agreement with results from simulations presented in ref. [52].…”

Section: Resultsmentioning

confidence: 99%

“…The general qualitative behavior obtained from analytical theories was reproduced, but the pancake regime was not recovered. The specific case of block-polyampholytes was addressed by Messina, where he has assessed the effects of block length and surface charge density on the monomer distribution [52]. The adsorption of polyampholytes on a spherical nanoparticle was addressed by Feng and Ruckenstein, who showed that the conformation of the adsorbed polyampholyte chain is dependent on the charge density and particle size [53].…”

Section: Introductionmentioning

confidence: 99%

Conformational properties of block-polyampholytes adsorbed on charged cylindrical surfaces

Caetano

Carvalho

2017

Eur. Phys. J. E

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Polyampholytes are polymers that have positive and negative monomers along their chain. The adsorption of polyampholytes on charged surfaces has been the subject of a large number of theoretical, computational and experimental studies due to its importance in a variety of bio and nanothechnological systems. However, computational studies focusing on interaction between polyampholytes and cylindrical charged surfaces are rather scarce. This study, therefore, aims to investigate the conformational properties of block-polyampholytes in the presence of a negatively charged cylinder by means of Metropolis Monte Carlo simulations. Adopting a simplified model in which the electrolyte solution is treated at the Debye-Hückel level, the effects of the ionic strength, the linear charge density of the cylinder and the block length on monomers distributions have been investigated. It was found that increasing the salt concentration promotes a transition from a conformation characterized by large loops to a necklace-like conformation parallel to the surface. It was also shown that, at low cylinder charge density, the increase in salt concentration and the length of the blocks lead to a change in the orientation of the adsorbed chain.

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Behavior of block-polyampholytes near a charged surface

Cited by 9 publications

References 24 publications

Formation of Complexes between Nanoparticles and Weak Polyampholyte Chains. Monte Carlo Simulations

Formation of Complexes between Nanoparticles and Weak Polyampholyte Chains. Monte Carlo Simulations

Molecular dynamics simulation of semiflexible polyampholyte brushes--The effect of charged monomers sequence

Conformational properties of block-polyampholytes adsorbed on charged cylindrical surfaces

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