The use of retention and drainage aids in the wet-end

Au, Christian; Johansson, Kristin; Thorn, Ian

doi:10.1007/978-94-017-0756-5_2

Cited by 2 publications

(2 citation statements)

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“…However, recent results indicate that the cellulose layer swells at pH 7, , which may be an indication of an increased number of charges. Washed cellulosic fibers and fines, on the other hand, always take on a negative charge due to the ionization of surface groups, mainly oxidized hemicelluloses, cellulose, and lignin. − In the case of the present LB-cellulose, the only likely source of negative charge is carboxyl groups since the p K a of other possible sources, e.g., sugar alcoholic groups and hemiacetal OH groups is above 12 , and type II cellulose studied by scanning probe microscopy support the thesis of a charged cellulose surface.…”

Section: Resultsmentioning

confidence: 62%

X-ray Photoelectron Spectroscopy in the Study of Polyelectrolyte Adsorption on Mica and Cellulose

et al. 2000

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X-ray photoelectron spectroscopy was used to estimate the absolute amount of cationic polyelectrolytes that adsorbs on mica and cellulose surfaces in aqueous media. The calculation takes advantage of the knowledge of the mica crystal composition at the basal plane and its ion-exchange properties in aqueous solution. The XPS was operated under monochromatic and unmonochromatic mode and good agreement was observed in the resulting adsorbed amount. The evaluation of the amount of cationic polyelectrolyte adsorbed on cellulose was achieved using calibration curves obtained from adsorption data for the same polyelectrolytes on bare mica surfaces. The adsorption isotherm for polyelectrolytes of low charge density adsorbed on cellulose reveals that their affinity toward cellulose is weaker compared to that observed for highly charged surfaces such as mica. The effect of the polyelectrolyte charge density on the adsorbed amount and the number density of charged segments adsorbed on cellulose were also investigated. From these results it can be concluded that nonelectrostatic interactions are the main contributors to the adsorption of polyelectrolytes on cellulose, but it cannot be ruled out that electrostatic effects also take part in the adsorption mechanism. Finally, it is demonstrated that it is not correct to use the adsorbed amount of polyelectrolytes to determine the surface charge on cellulose surfaces.

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Section: Resultsmentioning

confidence: 62%

X-ray Photoelectron Spectroscopy in the Study of Polyelectrolyte Adsorption on Mica and Cellulose

et al. 2000

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“…With the increased awareness of wet end chemistry came increased activity by instrumentation and process control companies in the development of applicable on-line sensors. For the reader interested in an in-depth discussion of wet end chemistry, a number of sources are available [281,282,283,284,285,286,287].…”

Section: Wet End Chemistry 1 Introductionmentioning

confidence: 99%

On-line Papermaking Sensors: An Historical Perspective

Waller

2001

Trans. Of the XIIth Fund. Res. Symp. Oxford, 2001

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As the title implies, this paper will discuss papermaking on-line instrumentation, concentrating on sensors for paper quality measurements. The review is intended to explore not just the techniques for measurement, but also the evolution of a particular measurement and the research behind it. On-line instrumentation will be the primary focus, covering not only the usual structural, mechanical and appearance properties of paper but also certain water system measurements around the papermaking thin/thick stock loop. These measurements will include a discussion of the sensors pertaining to “wet end chemistry” and consistency, with their incorporation into retention control schemes. Discussion of off-line, laboratory measurements will be included where pertinent to provide a prediction of future on-line sensor availability. The usual papermaking process measurements such as pH, temperature, level, pressure and flow will not be covered.

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The use of retention and drainage aids in the wet-end

Cited by 2 publications

References 3 publications

X-ray Photoelectron Spectroscopy in the Study of Polyelectrolyte Adsorption on Mica and Cellulose

X-ray Photoelectron Spectroscopy in the Study of Polyelectrolyte Adsorption on Mica and Cellulose

On-line Papermaking Sensors: An Historical Perspective

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