Adsorption and Desorption Mechanism of Carboxylate to Alumina Particles
| Autor: | JunIchiro Tsubaki, Takayoshi Kiguchi, Takamasa Mori |
|---|---|
| Rok vydání: | 2012 |
| Předmět: |
Fluid Flow and Transfer Processes
Materials science Process Chemistry and Technology technology industry and agriculture Sintering Filtration and Separation equipment and supplies Dispersant Catalysis chemistry.chemical_compound Adsorption chemistry Chemical engineering Desorption Slurry Molecule Organic chemistry Particle Carboxylate |
| Zdroj: | Journal of the Society of Powder Technology, Japan. 49:274-280 |
| ISSN: | 1883-7239 0386-6157 |
| Popis: | The particle assembling state in a slurry affects the production quality or performance in ceramic industry and so on. Generally, to control the assembling state dispersants are added However, it is difficult to control it precisely because the adsorbing mechanism of dispersants has not been clarified enough. We have tried to make clear the adsorption mechanism of dispersant mainly through the observation of desorption behavior of the adsorbed dispersant. A mono-carboxylate and a polycarboxylate were used as dispersant, and two kinds of pure alumina powder were used : one contains Mg as sintering aid and the other one doesn't. It was found that the hydrophilic carboxyl groups in dispersants adsorbs on alumina particles electrostatically. In addition it was shown that polycarboxylate strongly adsorbs on alumina powder since it has a lot of carboxyl groups in a molecule. Furthermore, when containing Mg into alumina powder, dispersants should associate to Mg on the particle surface, resulting in much stronger adsorption. |
| Databáze: | OpenAIRE |
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