Macro-ions. III. The Solution Behavior of a Polymeric Ampholyte<sup>1</sup>

Ehrlich, Gert; Doty, Paul

doi:10.1021/ja01643a053

Cited by 94 publications

(53 citation statements)

References 4 publications

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“…The value of salt concentration in the solution is an important parameter for tuning the structural * Electronic address: fazli@iasbs.ac.ir properties of polyampholyte chains. With increasing the salt concentration, the coil size and the viscosity increase in the solution of nearly charge-balanced polyampholyte chains and decrease in the case of the solution of polyampholytes with a large net charge (the polyelectrolyte regime) [10,11,12,13].…”

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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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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“…From the data for the polyampholyte in Figure 5, we have ~= I +~ [11]00 Ji (8) where A= 0.0022 and 0.040 for pH= 4 and 5, and I, respectively. Since eq 6 is rewritten as the electrostatic part of expansion factor for the polyampholyte (aqe 3 )AMP is obtained by substituting eq 8 (11) where the B values are 1.85 and 3.94 for i=0.103 and 0.400, respectively. 1° From eq 7, 10, and 11, the ratio of f(i) for the polyampholyte, f(i)AMP, to that for PNaA, f(i)PNaA, is given by:…”

Section: Res Ul Ts and Discussionmentioning

confidence: 99%

PH and Ionic Strength Dependences of the Intrinsic Viscosity of Betaine-Type Polyampholyte

Muroga

Aida

Katagiri

et al. 1995

Polym J

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ABSTRACT:The intrinsic viscosity, [11], was measured for the betaine-type polyampholyte, poly(2-(methacryloyloxy)ethyl 2-(trimethylammonio)ethyl phosphate), in aqueous solution at various pH and ionic strengths, I. The linear relationship between 1/JT and [11] for ordinary polyelectrolytes was also observed for the polyampholyte at low I near isoionic pH and over a wide range of I at other pH. By comparing I dependence of the electrostatic expansion factor of the polyampholyte with that of poly(sodium acrylate), it is suggested that there is a pronounced intramolecular attraction between the segments due to the oppositely-charged groups even when pH deviates from the isoionic pH.

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“…The reciprocal angular envelope in pure water decreases with increasing scattering angle. This negative slope results in the angular dissymmetry smaller than unity: light scattering is subject to the effect of external interference [1,14,15] due to the long-range intermicellar interaction. The same effect can be found in the angular dependence of light scattering for micelles in 10 -4 and 10 -3 N HC1 solutions and also in 10 -3 N HCI-10 -3 M NaC1 solutions.…”

Section: Flexibility Of Rodlike Micellesmentioning

confidence: 99%

Formation of rodlike micelles of dimethyloleylamine oxide in aqueous solutions: effects of addition of HCl and NaCl on the micelle size and the intermicellar interaction

Imae

Ikeda

1985

Colloid & Polymer Sci

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Angular dependence of light scattering has been measured for aqueous solutions of dimethyloleylamine oxide in the presence of HC1 and NaC1. In micellar solutions more concentrated than 0.1 x 10 -2 g cm -3, rodlike micelles are dominantly formed, and their properties are strongly reflected in the characteristics of the solutions. The aggregation number, radius of gyration and even flexibility of the rodlike miceltes increase with the addition of HC1 as well as NaC1. The increase of HC1 concentration up to 10 -3 N makes the aggregation number of rodlike micelles as large as 58,000, when 0.01 M NaClis present. The large micelle size would be stabilized by the dehydration of the amine oxide group and the hydrogen bonding between nonprotonated and protonated molecules in a micelle.In aqueous solutions without HC1 and NaC1 or in their presence at very low concentrations, the light scattering is subject to the effects of both external and internal interferences. The effect of external interference can be separated from the effect of internal interference by applying the Zernike-Prins equation to the observed angular dependence of light scattering. Then the second virial coefficient and the pair interaction potential of rodlike micelles can be derived by means of certain approximate methods. The addition of HC1 to 10 .3 N makes both repulsive and attractive forces stronger and the resulting potential well deeper, but the addition of NaC1 depresses such an effect of HC1 considerably.

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Macro-ions. III. The Solution Behavior of a Polymeric Ampholyte¹

Cited by 94 publications

References 4 publications

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

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

PH and Ionic Strength Dependences of the Intrinsic Viscosity of Betaine-Type Polyampholyte

Formation of rodlike micelles of dimethyloleylamine oxide in aqueous solutions: effects of addition of HCl and NaCl on the micelle size and the intermicellar interaction

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Macro-ions. III. The Solution Behavior of a Polymeric Ampholyte1

Cited by 94 publications

References 4 publications

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

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

PH and Ionic Strength Dependences of the Intrinsic Viscosity of Betaine-Type Polyampholyte

Formation of rodlike micelles of dimethyloleylamine oxide in aqueous solutions: effects of addition of HCl and NaCl on the micelle size and the intermicellar interaction

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Macro-ions. III. The Solution Behavior of a Polymeric Ampholyte¹