Adsorption of polymers at the solution-solid interface. I. Polyethers on silica

Howard, G. J.; McConnell, P.

doi:10.1021/j100868a031

Cited by 102 publications

(35 citation statements)

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“…It is worth noting that, in water, the maximal quantity of PEO adsorbed on the silica surface (the plateau adsorbed amount on the Langmuir isotherm) is independent of the PEO molecular weight [50,51]. Thus, after the flush with the 0.1 M HCl PEO solution, the capillary surface was expected to retain the same quantity of adsorbed PEO, whatever the PEO molar mass.…”

Section: Noncovalent Peo Coating On a New Fused-silica Capillarymentioning

confidence: 98%

Noncovalent coatings for the separation of synthetic polypeptides by nonaqueous capillary electrophoresis

et al. 2005

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Recently, we demonstrated the possibility to extend the range of capillary electrophoresis (CE) applications to the separation of non-water-soluble synthetic polymers. This work focuses on the control of the electro-osmotic flow (EOF) and on the limitation of the solute adsorption in nonaqueous electrolytes. For these purposes, different strategies were investigated. For the initial, a viscous additive (ethylene glycol or glycerol) was used in the electrolyte in order to decrease the EOF magnitude and, possibly, to compete with solute adsorption. A second strategy was to modify, before separation, the fused-silica capillary wall by the adsorption of poly(ethylene oxide) (PEO) via hydrogen bonding. The influence of the molecular mass of the adsorbed PEO on the EOF magnitude and direction was studied in electrolytes based on methanol/acetonitrile mixtures containing ammonium ions. For PEO molecular masses above 1000 g/mol, reversed (anodic) EOF were reported in accordance with previous results obtained with PEO covalently bonded capillaries. The influence of the nature and the concentration of the background electrolyte cation on the EOF magnitude and direction were also investigated. A third strategy consisted in modifying the capillary wall by the adsorption of a cationic polyelectrolyte layer. Advantageously, this polyelectrolyte layer suppressed the adsorption of the polymer solutes onto the capillary wall. The results obtained in this work confirm the high potential and the versatility of CE for the characterization of ionizable organic polymers in nonaqueous media.

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Section: Noncovalent Peo Coating On a New Fused-silica Capillarymentioning

confidence: 98%

Noncovalent coatings for the separation of synthetic polypeptides by nonaqueous capillary electrophoresis

et al. 2005

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“…The thickness of these adsorbed films tends to be very small, suggesting that the polymers lie in a flat configuration on the surface, in agreement with the results of other workers. 10 The addition of MgSO, greatly increases the film thickness, while it is well known that added salt decreases the observed drag reduction.ll Surface energy effects are unimportant, since disk composition and cleanliness had no effect on the observed drag reduction. Specifically, acid-cleaned or detergent-cleaned disks gave results identical to disks exposed to the laboratory environment.…”

Section: Experiments Commentsmentioning

confidence: 98%

On the role of adsorption in the drag reduction effect

Peyser

Little

1974

J of Applied Polymer Sci

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“…29 Klein et al have also suggested, in their studies of the mechanical properties of soluble polymer (PEO)/silica hybrids, that the interactions between the polymer chains and the silica network occur largely through hydrogen bonding between ether oxygen in PEO and silanols. 30 …”

Section: Morphology Studies the Effect Of Silica Contentmentioning

confidence: 99%

Compatibilization of water borne poly(ethylene oxide)‐silica hybrids

Manaf

Mascia

2004

Adv Polym Technol

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Organic-inorganic hybrid materials, incorporating nanostructured silica networks within a poly(ethylene oxide) matrix (PEO), were produced via the sol-gel process from water solution mixtures of poly(ethylene oxide) and prehydrolyzed tetraethylorthosilicate (TEOS) in the presence of a trialkoxysilane compatibilization agent, ␥ -glycidyloxypropyltrimethoxysilane (GOTMS). These mixtures were cast into films by evaporating the solvent and finally drying in an air-circulating oven at 60• C. By varying the composition of the alkoxysilane solution mixture and mixing conditions, different morphologies were obtained, ranging from semi-interpenetrating networks of PEO within highly cross-linked siloxane domains, to finely dispersed nanostructured systems exhibiting either co-continuous or particulate structure. The effects of pH, type of solvents, mixing temperatures and time, as well as the concentration of the compatibilization agent was found to be extremely important in controlling the morphology and properties of the final PEO-SiO 2 hybrid films. C

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Adsorption of polymers at the solution-solid interface. I. Polyethers on silica

Cited by 102 publications

References 0 publications

Noncovalent coatings for the separation of synthetic polypeptides by nonaqueous capillary electrophoresis

Noncovalent coatings for the separation of synthetic polypeptides by nonaqueous capillary electrophoresis

On the role of adsorption in the drag reduction effect

Compatibilization of water borne poly(ethylene oxide)‐silica hybrids

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