Shaping calcite crystals by means of comb polyelectrolytes having neutral hydrophilic teeth
| Autor: | Simona Fermani, Danilo Malferrari, Paola Galletti, Marco Goisis, Emilio Tagliavini, Giuseppe Falini |
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| Přispěvatelé: | Danilo Malferrari, Simona Fermani, Paola Galletti, Marco Goisi, Emilio Tagliavini, Giuseppe Falini |
| Rok vydání: | 2013 |
| Předmět: |
chemistry.chemical_classification
Hydrogen bond Backbone chain Surfaces and Interfaces Polymer BIOMINERALIZATION Condensed Matter Physics Polyelectrolyte NON CLASSICAL CRYSTALLIZATION law.invention chemistry.chemical_compound chemistry law Polymer chemistry CALCIUM CARBONATE Electrochemistry Copolymer General Materials Science Crystallization COMB POLYMERS Ethylene glycol Spectroscopy Acrylic acid |
| Zdroj: | Langmuir : the ACS journal of surfaces and colloids. 29(6) |
| ISSN: | 1520-5827 |
| Popis: | Comb polyelectrolytes (CPs) having neutral hydrophilic teeth, similar to double hydrophilic block copolymers, are a powerful tool to modify the chemical-physical properties of inorganic crystalline materials. One of their main applications is in concrete technology, where they work as superplasticizers, particle-dispersing agents. Here, CPs, having the same poly(acrylic acid) (PAA) backbone chain and differing in the grafting with methoxy poly(ethylene glycol) chains (MPEG) of two molecular weights, were used to investigate the influence of tooth chains in polymer aggregation and in control on morphology and aggregation of calcite particles. These polymers aggregate, forming interpolymer hydrogen bonds between carboxylic groups and ether oxygen functionalities. The presence of calcium ions in solution further enhances aggregation. Crystallization experiments of calcite in the presence of CPs show that the specificity of interactions between polymers and crystal planes and control on aggregation and size of particles is a function of the content and chain length of the MPEG in the PAA backbone. These parameters limit and can make specific the electrostatic interactions with ionic crystalline planes. Moreover, the mechanism of crystallization, classical or nonclassical, is addressed by the CP structure and concentration. These findings have implications in the understanding of the complex chemical processes associated to concrete superplasticizers action and in the study of the biomineralization processes, where biological comb polyelectrolytes, the acidic glycoproteins, govern formation of calcitic structures. |
| Databáze: | OpenAIRE |
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