Multichain adsorption at fluid interfaces: Amphiphilic homopolymers vs copolymers
| Autor: | A. A. Glagoleva, Valentina V. Vasilevskaya |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
chemistry.chemical_classification
Materials science 02 engineering and technology Polymer 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Biomaterials chemistry.chemical_compound Colloid and Surface Chemistry Monomer Adsorption chemistry Chemical engineering Amphiphile Copolymer 0210 nano-technology Langevin dynamics Layer (electronics) Macromolecule |
| Zdroj: | Journal of Colloid and Interface Science. 585:408-419 |
| ISSN: | 0021-9797 |
| Popis: | Hypothesis At selective liquid–liquid interface, amphiphilic homopolymers, having groups with different affinity for the liquids in each monomer unit, would demonstrate higher occupation of the interfacial layer than copolymers with various distributions of groups and be advantageous as interface stabilizers. Experiments By means of Langevin dynamics computer simulation, conformations of multiple chains of amphiphilic macromolecules adsorbed at the liquid–liquid interface were studied. Monomer units having different affinity for the liquids were distributed variously along the polymer chains. Homopolymers, amphiphilic at the level of an individual monomer unit, and copolymers with random, altermating and multiblock distribution of groups were considered. The surface coverage, structure of the layer, and spatial distribution of monomer units were investigated depending on the polymer concentration. Findings Compared to copolymers with random, alternating and multiblock distributions of the groups, the interfacial layer concentration of amphiphilic homopolymer is about 1.5 times higher, the adsorbed layer is remarkably thinner, has membrane-like structure and is asymmetric with respect to interface boundary. Also, the adsorbed amphiphilic homopolymers form fewer loops and tails, most located on one side of the interface. This combination of properties is promising for practical application in modern self-assembling molecular devices. |
| Databáze: | OpenAIRE |
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