Electrostatic Titrations Reveal Surface Compositions of Mixed, On-Nanoparticle Monolayers Comprising Positively and Negatively Charged Ligands
| Autor: | Wojciech J. Pudlo, Bartosz A. Grzybowski, Bartlomiej Kowalczyk, Pramod P. Pillai |
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| Rok vydání: | 2016 |
| Předmět: |
Chemistry
Precipitation (chemistry) Inorganic chemistry Analytical chemistry Nanoparticle Self-assembled monolayer 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials General Energy Adsorption Nanocrystal Monolayer Titration Physical and Theoretical Chemistry 0210 nano-technology Metal nanoparticles |
| Zdroj: | The Journal of Physical Chemistry C. 120:4139-4144 |
| ISSN: | 1932-7455 1932-7447 |
| DOI: | 10.1021/acs.jpcc.5b12599 |
| Popis: | A general-purpose procedure based on electrostatic titrations was developed to determine the compositions of mixed self-assembled monolayers (m-SAMs) of oppositely charged ligands on metal nanoparticles (NPs). In this procedure, nanoparticles of unknown m-SAM compositions and charges are titrated with the positively charged NP “standards”. These compositions and the differences in the free energies of adsorption of the [+] and [−] are then determined from the points of precipitation at which the overall charge on all NPs is neutralized. The results of the titrations agree well with traditional core-etching/NMR studies. However, the titration-based approach is nondestructive and requires significantly less material than NMR. |
| Databáze: | OpenAIRE |
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