Role of surface charge in deposition of filler particles onto pulp fibres
| Autor: | Štefan Šutý, Vlasta Lužáková |
|---|---|
| Rok vydání: | 1998 |
| Předmět: |
Polyethylenimine
Pulp (paper) Kinetics technology industry and agriculture Cationic polymerization macromolecular substances engineering.material chemistry.chemical_compound Colloid Colloid and Surface Chemistry Calcium carbonate Adsorption chemistry Chemical engineering engineering Organic chemistry Surface charge |
| Zdroj: | Colloids and Surfaces A: Physicochemical and Engineering Aspects. 139:271-278 |
| ISSN: | 0927-7757 |
| DOI: | 10.1016/s0927-7757(98)00322-7 |
| Popis: | The effect of cationic polyethylenimine (PEI) on colloidal stability of ground calcium carbonate and its deposition on pulp fibres suspended in water was investigated. The adsorption of PEI on negatively charged CaCO 3 particles causes destabilization due to the elimination of charge. With increasing additions of PEI, restabilization of positively charged CaCO 3 takes place. Based upon these results the filler was pretreated with PEI in order to encourage its deposition on negatively charged fibres. Two levels of PEI addition were used to produce either CaCO 3 aggregates or dispersed particles. The extent of deposition, the deposition time τ , and the capture efficiency α 0 were established. The results indicate that positively charged filler aggregates deposit faster than dispersed particles. Alternatively, the fibres were treated with two levels of PEI, the same as that used for CaCO 3 treatment, and the deposition of CaCO 3 was observed. The deposition efficiency in this case was lower. |
| Databáze: | OpenAIRE |
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