Interactions of a cationic cellulose derivative with an ultrathin cellulose support
| Autor: | Stefan Spirk, Rupert Kargl, Karin Stana-Kleinschek, Thomas Heinze, Thomas Grießer, Tamilselvan Mohan, Aleš Doliška, Cíntia Salomão Pinto Zarth |
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| Rok vydání: | 2013 |
| Předmět: |
Materials science
Polymers and Plastics Silicon dioxide Inorganic chemistry 02 engineering and technology Electrolyte Substrate (electronics) 010402 general chemistry 01 natural sciences Contact angle chemistry.chemical_compound Adsorption Materials Chemistry Cellulose Aminobutyrates Organic Chemistry Quartz crystal microbalance Hydrogen-Ion Concentration Silicon Dioxide 021001 nanoscience & nanotechnology 0104 chemical sciences chemistry Wetting 0210 nano-technology Hydrophobic and Hydrophilic Interactions |
| Zdroj: | Carbohydrate Polymers. 92:1046-1053 |
| ISSN: | 0144-8617 |
| DOI: | 10.1016/j.carbpol.2012.10.026 |
| Popis: | The adsorption behavior of cellulose-4-[ N -methylammonium]butyrate chloride (CMABC) on two hydrophilic substrates is studied, namely nanometric cellulose model thin films and silicon dioxide substrates. The adsorption is quantified in dependence of electrolyte concentration and pH value using a quartz crystal microbalance with dissipation (QCM-D). In case of CMABC, at high ionic strengths (25–100 mM NaCl) high adsorption is observed at pH 7 (Δ f 3 : −15 to −17 Hz) while at lower ionic strengths (1–10 mM) less CMABC (Δ f 3 : −2 to −12 Hz) is deposited on the cellulose surfaces as indicated by the frequency changes using QCM-D. A change in pH value from 7 to 8 reveals an increase in adsorption. Atomic force microscopy shows that the coating of cellulose thin films with CMABC changes the morphology from a fibrillar to a particle like structure on the surface. The surface wettability with water increases with an increasing amount of CMABC on the surface compared to neat cellulose model films. At lower pH values (3 and 5), CMABC does not adsorb onto the cellulose model thin films. XPS is used to validate the results and to determine the nitrogen content of the surfaces. In addition, adsorption of CMABC onto another hydrophilic and negatively charged substrate, silicon dioxide coated quartz crystals, cannot be detected at different pH values and electrolyte concentrations as proven by QCM-D. |
| Databáze: | OpenAIRE |
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