On the steady shear behavior of hydrophobic fumed silica suspensions in PPG and PEG of low molecular weight
| Autor: | Francisco Jose Rubio-Hernandez, J. F. Velázquez-Navarro, A.I. Gómez-Merino, N.M. Páez-Flor |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
chemistry.chemical_classification
education.field_of_study Materials science Population 02 engineering and technology General Chemistry Polyethylene glycol Hexadecane 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Solvent chemistry.chemical_compound Polypropylene glycol chemistry Polymer chemistry General Materials Science 0210 nano-technology education Alkyl Fumed silica Hydrophobic silica |
| Zdroj: | Soft Materials. 15:55-63 |
| ISSN: | 1539-4468 1539-445X |
| DOI: | 10.1080/1539445x.2016.1242501 |
| Popis: | Fumed silica with n-hexadecane molecules anchored onto its surface (Aerosil®R816) was dispersed in polypropylene glycol of low molecular weight (PPG400). This system showed a complex steady shear behavior: shear-thickening between two shear-thinning regions. Only shear-thinning behavior was observed when R816 was dispersed in polyethylene glycol of low molecular weight (PEG200). To conciliate both experimental results, Raman spectra of linear hexadecane, n-hexadecane/PPG400, and n-hexadecane/PEG200 mixtures were obtained. Results pointed out a distinct population of conformers could exist in each n-hexadecane-polymer mixture. More specifically, alkyl chains acquired straighter conformation in the PPG400 solvent, while the same alkyl chains showed globular conformations in PEG200. |
| Databáze: | OpenAIRE |
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