Surface area of papermaking woodpulps used by the British paper industry |
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Authors: | Thelma M Herrington James C Petzold |
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Institution: | (1) Department of Chemistry, University of Reading, RG6 2AD Reading, UK |
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Abstract: | The surface area was determined for various papermaking woodpulps: bleached eucalyptus globulus sulphate pulp; bleached eucalyptus grandis sulphate pulp; bleached betula verrucosa sulphate pulp; bleached pine/spruce sulphate pulp; bleached pine/spruce sulphate pulp fines. The method of negative adsorption was used which gives an effective wet surface area. By looking at negative adsorption data more closely, some inference can be made about the morphology of the substrate.Glossary of symbols
B
(e2/2 kT)1/2
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¯C
concentration of fibre per unit volume of pulp
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1 - ¯ ¯c
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h
angle between pore and the axis of the bed in a permeable material
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K
permeability coefficient
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k
Boltzmann constant
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k
0
shape factor for pores in a permeable material
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n
i
concentration of co-ion in the bulk solution
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n
i
experimentally observed increase in concentration of co-ion in the bulk solution
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S
surface area
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S
t
wS
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S
0
surface area per unit volume of permeable material
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V
t
total volume of solution
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V
excluded volume
- V
s
excluded volume accessible to water but not to ions
- V
obs
experimentally observed excluded volume
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w
weight of dry fibre
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¯
effective volume of fibres in a permeable pad
-
surface potential at outer Helmholtz plane |
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Keywords: | surface area eucalyptus globulus sulphate pulp encalyptus grandis sulphate pulp betula verrucosa sulphate pulp pine/spruce sulphate pulp surface change |
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