Nanoconfined liquid dynamics in aqueous and nonaqueous systems investigated with nonlinear infrared spectroscopies
Abstract/Contents
- Abstract
- Nanoconfined liquids are found in settings ranging from nature to industry, from intracellular fluids to reagents in mesoporous nanoreactors. Their behavior is often distinct from their bulk counterparts, providing unique opportunities to design new materials and processes that harness the differences. Despite the growing applications of materials such as mesoporous silica as nanoconfinement frameworks, the challenge remains to derive molecular-level details from the experimental observables and understand the underlying mechanisms that govern confined behavior. This work aims to contribute to the efforts to predict the dynamical and structural properties of liquids confined in mesoporous silica based on the nature of the liquid. Using ultrafast infrared pulses with durations of ~160 fs and vibrational probes with vibrational lifetimes of 20-200 ps, both very fast time scales, like the subpicosecond bulk water dynamics, and dramatically slower time scales upwards of 100 ps for confined liquid dynamics can be studied. Polarization selective pump-probe (PSPP) and two-dimensional infrared (2D IR) vibrational echo spectroscopies are the two nonlinear third-order techniques used to measure the rotational and vibrational frequency dynamics, respectively, of the chemical systems. Ultrafast studies of confined liquids other than water are scarce, so the understanding of confinement effects benefits from studies on liquids with different molecular dimensions and interactions with surface moieties. A nonaqueous solvent and a concentration series of an aqueous salt solution were used as non-water model systems for comparing the confinement effects in the same hydrophilic silica pores.
Description
| Type of resource | text |
|---|---|
| Form | electronic resource; remote; computer; online resource |
| Extent | 1 online resource. |
| Place | California |
| Place | [Stanford, California] |
| Publisher | [Stanford University] |
| Copyright date | 2023; ©2023 |
| Publication date | 2023; 2023 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Author | Hung, Samantha Ting |
|---|---|
| Degree supervisor | Fayer, Michael D |
| Thesis advisor | Fayer, Michael D |
| Thesis advisor | Dai, Hongjie, 1966- |
| Thesis advisor | Zare, Richard N |
| Degree committee member | Dai, Hongjie, 1966- |
| Degree committee member | Zare, Richard N |
| Associated with | Stanford University, School of Humanities and Sciences |
| Associated with | Stanford University, Department of Chemistry |
Subjects
| Genre | Theses |
|---|---|
| Genre | Text |
Bibliographic information
| Statement of responsibility | Samantha T. Hung. |
|---|---|
| Note | Submitted to the Department of Chemistry. |
| Thesis | Thesis Ph.D. Stanford University 2023. |
| Location | https://purl.stanford.edu/mj957hj6032 |
Access conditions
- Copyright
- © 2023 by Samantha Ting Hung
- License
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
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