Translational and rotational diffusion coefficients of gold nanorods functionalized with a high molecular weight, thermoresponsive ligand: a depolarized dynamic light scattering study
| Autor: | Marius Otten, Matthias Karg, Marco Hildebrandt, Gary Bryant, Déborah Feller, Marcel Krüsmann |
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| Rok vydání: | 2021 |
| Předmět: |
Range (particle radiation)
Materials science Rotational diffusion 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Aspect ratio (image) 0104 chemical sciences Colloid Dynamic light scattering Chemical physics Particle Nanorod Diffusion (business) 0210 nano-technology |
| Zdroj: | Soft matter. 17(15) |
| ISSN: | 1744-6848 |
| Popis: | Probing the rotational and translational diffusion and colloidal stability of nanorods is of significant fundamental interest with implications for many different applications. Recently R. Nixon-Luke and G. Bryant presented a method to analyze angle-dependent depolarized dynamic light scattering data allowing for the clear separation of the translational and rotational diffusion coefficients of gold nanorods in dilute suspension (R. Nixon-Luke and G. Bryant, Part. Part. Syst. Charact., 2018, 36, 1800388). In the present work we applied this analysis to gold nanorods decorated with high molecular weight, thermoresponsive poly-N-isopropylacrylamide ligands, which results in particles with lower effective aspect ratios. The temperature response of the ligand shell is studied. We precisely determine the translational and rotational diffusion coefficients over a broad range of temperatures and the results are compared to theoretical predictions. The results show that as temperature increases the ligands collapse, and the effective aspect ratio increases as the particle shape transitions from prolate spheroid at low temperatures to more cylindrical at high temperatures. |
| Databáze: | OpenAIRE |
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