Maienshein, Daniel N
(2021)
Development of Protocols to Increase the Size Monodispersity and Surface Charge of Silica Nanoparticles for Use in Crystalline Colloidal Arrays.
Master's Thesis, University of Pittsburgh.
(Unpublished)
This is the latest version of this item.
Abstract
Crystalline colloidal arrays (CCAs) are three-dimensional, non-close packed periodic
structures formed from the self-assembly of charged colloidal particles suspended in solutions of low ionic strength. CCAs made from nanoparticles can be tailored to diffract ultraviolet (UV), visible, or infrared light, and thus can be used as optical components
in Raman spectrometers. For example, using CCAs as wavelength selection devices has enabled the hyperspectral imaging of explosive-contaminated surfaces. However, the fabrication of CCAs which diffract UV light at wavelengths below 229 nm and which exhibit
high diffraction efficiencies and narrow bandwidths has not yet been accomplished. Synthesis or post-synthesis processing techniques expected to improve CCA diffraction efficiencies and bandwidths include increasing particle size monodispersity, increasing surface charge,
and decreasing particle diameter. In this thesis, a protocol is developed to improve the size
monodispersity of 185 nm silica nanoparticles (NPs) from 10% to 6%, and that of 100 nm
silica NPs from 15% to 11%. After slight modification, this protocol is expected to work
for particles of smaller diameter as well. Additionally, a two-step surface functionalization
of 100 nm silica NPs using (3-trihydroxysilyl)-1-propanesulfonic acid (THOPS) was carried
out in various pH conditions with the goal of maximizing the surface charge. The failure to
significantly increase the surface charge is discussed, and hypotheses are provided to explain
this result. Finally, outlines of future experiments and directions are given.
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Details
| Item Type: |
University of Pittsburgh ETD
|
| Status: |
Unpublished |
| Creators/Authors: |
| Creators | Email | Pitt Username | ORCID  |
|---|
| Maienshein, Daniel N | dnm48@pitt.edu | dnm48 | |
|
| ETD Committee: |
|
| Date: |
8 October 2021 |
| Date Type: |
Publication |
| Defense Date: |
1 June 2021 |
| Approval Date: |
8 October 2021 |
| Submission Date: |
4 May 2021 |
| Access Restriction: |
No restriction; Release the ETD for access worldwide immediately. |
| Number of Pages: |
79 |
| Institution: |
University of Pittsburgh |
| Schools and Programs: |
Dietrich School of Arts and Sciences > Chemistry |
| Degree: |
MS - Master of Science |
| Thesis Type: |
Master's Thesis |
| Refereed: |
Yes |
| Uncontrolled Keywords: |
Photonic crystals, Raman spectroscopy, monodispersity, centrifugation, grafting density |
| Date Deposited: |
08 Oct 2021 18:32 |
| Last Modified: |
08 Oct 2021 18:32 |
| URI: |
http://d-scholarship.pitt.edu/id/eprint/41229 |
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Development of Protocols to Increase the Size Monodispersity and Surface Charge of Silica Nanoparticles for Use in Crystalline Colloidal Arrays. (deposited 08 Oct 2021 18:32)
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