Macro-ions. II. Polymethacrylic Acid

Oth, A.; Doty, Paul

doi:10.1021/j150493a010

Cited by 161 publications

(29 citation statements)

References 4 publications

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“…Similar phenomena on nonrandom arrangements of macromolecules were observed for globular proteins [41] and polyelectrolytes [14,42] in the absence of added salt by means of light scattering.…”

Section: Discussionsupporting

confidence: 73%

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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Section: Discussionsupporting

confidence: 73%

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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“…Theories and titration data appear to overestimate the radius of gyration (R G ), both as an absolute number and in its dependence on the degree of ionization in the presence of background electrolytes such as sodium chloride (50). Even if the value of R G as calculated from viscosity data is used, the problem remains since in most cases the amount adsorbed (at monolayer coverage) is usually found experimentally to be greater than that calculated using this "viscosity" radius.…”

Section: Comparison Of Experiments With Theorymentioning

confidence: 99%

“…The degrees of ionization can be calculated from titration data for a given pH, but conductivity results showed that a "fully" charged polymer is only ϳ60% charged when background electrolyte ions are present even at very low concentrations (Ͻ1 mM) (50). This is probably due to charge screening.…”

Section: Comparison Of Experiments With Theorymentioning

confidence: 99%

The Adsorption of Polyelectrolytes on Hydroxyapatite Crystals

Tsortos

Nancollas

1999

Journal of Colloid and Interface Science

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“…A majority of the authors came to the conclusion that the macroions are stretched out like a rod in dissociating solvents as a result of electrostatic repulsive interaction between ionized groups. As early as in the 1950s, Katchalsky, [1] Doty [2] and Fuoss [3] revealed that the exponent a in the relation [g] = KM a for the intrinsic viscosity was two for polyions in salt-free solutions. The stretched-rod conformation of polyelectrolytes (a X 2) has since been universally accepted and claimed for charged chains, [4,5] in particular for sodium poly(styrene sulfonate) (PSS).…”

Section: Introductionmentioning

confidence: 99%