Curvature driven phase separation in mixed ligand coated gold nanoparticles
Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2006.
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| Format: | Thesis |
| Language: | eng |
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Massachusetts Institute of Technology
2006
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| Online Access: | http://hdl.handle.net/1721.1/35065 |
| _version_ | 1811079672600985600 |
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| author | Jacob Silva, Paulo H |
| author2 | Francesco Stellacci. |
| author_facet | Francesco Stellacci. Jacob Silva, Paulo H |
| author_sort | Jacob Silva, Paulo H |
| collection | MIT |
| description | Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2006. |
| first_indexed | 2024-09-23T11:18:52Z |
| format | Thesis |
| id | mit-1721.1/35065 |
| institution | Massachusetts Institute of Technology |
| language | eng |
| last_indexed | 2024-09-23T11:18:52Z |
| publishDate | 2006 |
| publisher | Massachusetts Institute of Technology |
| record_format | dspace |
| spelling | mit-1721.1/350652019-04-12T09:02:03Z Curvature driven phase separation in mixed ligand coated gold nanoparticles Jacob Silva, Paulo H Francesco Stellacci. Massachusetts Institute of Technology. Dept. of Materials Science and Engineering. Massachusetts Institute of Technology. Dept. of Materials Science and Engineering. Materials Science and Engineering. Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2006. Includes bibliographical references (leaves 31-33). Monolayer-coated gold nanoparticles have been the subject of extensive studies in fields ranging from physics to medicine. The properties of these nanomaterials such as solubility and surface energy are often attributed solely to the chemical functionalities of the ligand head-groups. However, the morphology of these monomolecular layers on gold nanoparticles plays as important of a role as the surface chemistry. Intriguing phase-separation phenomena have been observed for mixed self-assembled monolayers (SAM) of octanethiol (OT) and mercaptopropionic acid (MPA) on the surface of gold nanoparticles. These ordered structures are studied here through scanning tunneling microscope (STM) images, as a function of the gold core diameter, which is a measure of the particle's curvature. The packing of OT homoligand nanoparticles is found to have a head-group spacing of 0.54 nm, which differs from that on flat gold (111) surfaces, 0.5 nm. The OT:MPA heteroligand nanoparticles are observed to phase-separate into ordered ribbon-like domains, with spacings that depend on the nanoparticle diameter. A geometric framework that includes a continuous and crystallographic description is established to best describe the observed behaviors. by Paulo H. Jacob Silva. S.B. 2006-12-18T20:01:29Z 2006-12-18T20:01:29Z 2006 2006 Thesis http://hdl.handle.net/1721.1/35065 71229905 eng M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. http://dspace.mit.edu/handle/1721.1/7582 33 leaves 1661315 bytes 1660369 bytes application/pdf application/pdf application/pdf Massachusetts Institute of Technology |
| spellingShingle | Materials Science and Engineering. Jacob Silva, Paulo H Curvature driven phase separation in mixed ligand coated gold nanoparticles |
| title | Curvature driven phase separation in mixed ligand coated gold nanoparticles |
| title_full | Curvature driven phase separation in mixed ligand coated gold nanoparticles |
| title_fullStr | Curvature driven phase separation in mixed ligand coated gold nanoparticles |
| title_full_unstemmed | Curvature driven phase separation in mixed ligand coated gold nanoparticles |
| title_short | Curvature driven phase separation in mixed ligand coated gold nanoparticles |
| title_sort | curvature driven phase separation in mixed ligand coated gold nanoparticles |
| topic | Materials Science and Engineering. |
| url | http://hdl.handle.net/1721.1/35065 |
| work_keys_str_mv | AT jacobsilvapauloh curvaturedrivenphaseseparationinmixedligandcoatedgoldnanoparticles |