Effect of Grafting Density on the Two-dimensional Assembly of Nanoparticles
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arXiv
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| Format: | Preprint |
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2024
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| author | Nayak, Binay P. Batey, James Ethan Kim, Hyeong Jin Wang, Wenjie Bu, Wei Zhang, Honghu Mallapragada, Surya K. Vaknin, David |
| author_facet | Nayak, Binay P. Batey, James Ethan Kim, Hyeong Jin Wang, Wenjie Bu, Wei Zhang, Honghu Mallapragada, Surya K. Vaknin, David |
| contents | Employing grazing-incidence small-angle X-ray scattering (GISAXS) and X-ray reflectivity (XRR), we demonstrate that films composed of polyethylene glycol (PEG)-grafted silver nanoparticles (AgNP) and gold nanoparticles (AuNP), as well as their binary mixtures, form highly stable hexagonal structures at the vapor-liquid interface. These nanoparticles exhibit remarkable stability under varying environmental conditions, including changes in pH, mixing concentration, and PEG chain length. Short-chain PEG grafting produces dense, well-ordered films, while longer chains produce more complex, less dense quasi-bilayer structures. AuNPs exhibit higher grafting densities than AgNPs, leading to more ordered in-plane arrangements. In binary mixtures, AuNPs dominate the population at the surface, while AgNPs integrate into the system, expanding the lattice without forming a distinct binary superstructure. These results offer valuable insights into the structural behavior of PEG-grafted nanoparticles and provide a foundation for optimizing binary nanoparticle assemblies for advanced nanotechnology applications. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_05456 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Effect of Grafting Density on the Two-dimensional Assembly of Nanoparticles Nayak, Binay P. Batey, James Ethan Kim, Hyeong Jin Wang, Wenjie Bu, Wei Zhang, Honghu Mallapragada, Surya K. Vaknin, David Soft Condensed Matter Employing grazing-incidence small-angle X-ray scattering (GISAXS) and X-ray reflectivity (XRR), we demonstrate that films composed of polyethylene glycol (PEG)-grafted silver nanoparticles (AgNP) and gold nanoparticles (AuNP), as well as their binary mixtures, form highly stable hexagonal structures at the vapor-liquid interface. These nanoparticles exhibit remarkable stability under varying environmental conditions, including changes in pH, mixing concentration, and PEG chain length. Short-chain PEG grafting produces dense, well-ordered films, while longer chains produce more complex, less dense quasi-bilayer structures. AuNPs exhibit higher grafting densities than AgNPs, leading to more ordered in-plane arrangements. In binary mixtures, AuNPs dominate the population at the surface, while AgNPs integrate into the system, expanding the lattice without forming a distinct binary superstructure. These results offer valuable insights into the structural behavior of PEG-grafted nanoparticles and provide a foundation for optimizing binary nanoparticle assemblies for advanced nanotechnology applications. |
| title | Effect of Grafting Density on the Two-dimensional Assembly of Nanoparticles |
| topic | Soft Condensed Matter |
| url | https://arxiv.org/abs/2410.05456 |