The adsorption of polyampholytes on negatively and positively charged polystyrene latex

Blaakmeer, J.; Stuart, Martien A. Cohen; Fleer, G.J.

doi:10.1016/0021-9797(90)90352-o

Cited by 21 publications

(21 citation statements)

References 26 publications

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“…In solution also the formation of multichain aggregates or micelles were found experimentally [12,13] and were expected to have a strong influence on the adsorption process from these solutions [14,15]. The adsorption of statistical and diblock polyampholytes was reported by many authors [16][17][18][19][20][21] Therefore our investigations not only concern the single adsorption process. The aim of this article is to report the creation of highly regular polyampholytic structures at the solid/liquid interface adsorbed directly from solution.…”

Section: Introductionmentioning

confidence: 67%

Highly Regular Polyampholytic Structures Adsorbed Directly from Solution

Mahltig

Müller‐Buschbaum

Wolkenhauer

et al. 2001

Journal of Colloid and Interface Science

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This article concerns the adsorption of the diblock polyampholyte poly(methacrylic acid)-blockpoly((dimethylamino)ethyl methary-late) (PMAA-b-PDMAEMA) from aqueous solution on silicon substrates. The investigated polyampholyte is characterized by a small molecular weight around 15,000 g/mol and a big positively charged PDMAEMA block. The adsorbed amount determined by ellipsometry was str ongly influenced by the pH of the adsorption solution. Using dynamic light scattering polyampholytic structures with diameters around 50 nm were found in aqueous solution. The hydrodynamic diameter was hardly affected by changing the pH of the polymer solution. Analogous regular structures were also found by scanning force microscopy (SFM) and grazing incidence, small angle X-ray scattering (GISAXS) at the silicon surface after the adsorption process. While SFM provides a topographical image of a small part of the adsorbed polyampholytic layer; GISAXS was used to get a statistical description of the lateral surface structures. The adsorbed structures were highly regular and their sizes were nearly pH independent over a lar ge pH region. Only directly at the isoelectric point of the polyampholyte larger adsorbed structures were observed. Compared with earlier investigated PMAA-b-PDMAEMA systems we are now able to prepare highly regular polyampholytic structures at silicon surfaces. There are two kinds of interactions for the adsorbed micelles. First, the charged block of the chains is directly attracted to the substrate via electrostatic interactions, while the uncharged part of the chains is only hydrophobically attracted via the hydrophobic core of the adsorbed micelle.

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Section: Introductionmentioning

confidence: 67%

Highly Regular Polyampholytic Structures Adsorbed Directly from Solution

Mahltig

Müller‐Buschbaum

Wolkenhauer

et al. 2001

Journal of Colloid and Interface Science

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“…Here we need to distinguish between the adsorption of statistical and diblock polyampholytes 36–41. Statistical polyampholytes tend to form adsorbed polymer layers in a flat conformation and at a small adsorbed amount 36, 37. In contrast, diblock polyampholytes form monolayers of micelles,42, 43 similar to uncharged amphiphilic diblock copolymers 44–48…”

Section: Introductionmentioning

confidence: 99%

“…Theoretically, the adsorption behavior of polyampholytes has been discussed recently 32–35. Here we need to distinguish between the adsorption of statistical and diblock polyampholytes 36–41. Statistical polyampholytes tend to form adsorbed polymer layers in a flat conformation and at a small adsorbed amount 36, 37.…”

Section: Introductionmentioning

confidence: 99%

Diblock polyampholytes at the silicon-water interface: Adsorption as a function of block ratio and molecular weight

Mahltig

Jérôme

Stamm

2001

J. Polym. Sci. B Polym. Phys.

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“…However, when the addition of cationic starch was greater than of 30 mg/g, retention began to decrease and tended to stabilize slightly below 70 %. This decrease in retention, especially at a higher concentrations, was most probably caused by electrostatic repulsive forces between starch molecules in water and starch molecules already adsorbed on fibers because these forces prevent indi-vidual starch molecules from approaching the fiber surface [16,[32][33][34]. Fig.…”

Section: Effect Of Cationic Starch Concentrationmentioning

confidence: 97%

Influence of Cationic Starch Adsorption on Fiber Flocculation

Zakrajšek¹,

Fuente

Blanco

et al. 2009

Chem Eng & Technol

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The adsorption of cationic starch on hardwood fibers and its influence on flocculation were studied in relation to the dosage of cationic starch, the effect of shear forces and the presence of different concentrations of inorganic salts in the paper stock. Flocculation was monitored by means of a focused beam reflectance measurement (FBRM) probe. It was established that floc size at low shear rates depends on adsorption efficiency. At high shear forces, flocs were irreversibly decomposed despite the presence of a higher amount of adsorbed cationic starch on the fibers. Therefore, flocculation was produced by a bridging mechanism. The results show a significant effect of inorganic salts on the adsorption of cationic starch on fibers. Low concentrations of inorganic salts usually improved the adsorption process while higher concentrations (> 0.01 mol/L) reduced the adsorption and limited the flocculation process.

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The adsorption of polyampholytes on negatively and positively charged polystyrene latex

Cited by 21 publications

References 26 publications

Highly Regular Polyampholytic Structures Adsorbed Directly from Solution

Highly Regular Polyampholytic Structures Adsorbed Directly from Solution

Diblock polyampholytes at the silicon-water interface: Adsorption as a function of block ratio and molecular weight

Influence of Cationic Starch Adsorption on Fiber Flocculation

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