Full Text Available
Note: Clicking the button above will open the full text document at the original institutional repository in a new window.
Expansion of a porous organic molecular material induced by gas pressure
Thesis (MSc)--Stellenbosch University, 2024.
Saved in:
| Main Author: | |
|---|---|
| Other Authors: | |
| Format: | Thesis |
| Language: | en_ZA en_ZA |
| Published: |
Stellenbosch : Stellenbosch University
2024
|
| Subjects: | |
| Tags: |
No Tags, Be the first to tag this record!
|
| _version_ | 1867613811380322304 |
|---|---|
| access_status_str | Open Access |
| author | Mathada, Gundo |
| author2 | Barbour, Leonard James |
| author_browse | Barbour, Leonard James Mathada, Gundo |
| author_facet | Barbour, Leonard James Mathada, Gundo |
| author_sort | Mathada, Gundo |
| collection | Thesis |
| dc_rights_str_mv | Stellenbosch University |
| description | Thesis (MSc)--Stellenbosch University, 2024. |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/130487 |
| institution | Stellenbosch University (South Africa) |
| language | en_ZA en_ZA |
| last_indexed | 2026-06-10T12:42:04.592Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from SUNScholar — Stellenbosch University Repository |
| publishDate | 2024 |
| publishDateRange | 2024 |
| publishDateSort | 2024 |
| publisher | Stellenbosch : Stellenbosch University |
| publisherStr | Stellenbosch : Stellenbosch University |
| record_format | dspace |
| source_str | SUNScholar — Stellenbosch University Repository |
| spelling | oai:scholar.sun.ac.za:10019.1/130487 Expansion of a porous organic molecular material induced by gas pressure Mathada, Gundo Barbour, Leonard James Stellenbosch University. Faculty of Science. Dept. of Chemistry and Polymer Science. Crystallography Porous materials -- Thermal properties Expansion (Heat) Hydrostatic pressure Molecular crystals Thesis (MSc)--Stellenbosch University, 2024. ENGLISH ABSTRACT: The interplay between external stimuli and the structural properties of crystalline materials holds immerse potential for the design of novel functional materials. In this study, the intriguing phenomenon of reversible elongation of an organic crystal in response to gas pressure (carbon dioxide and ethylene) was investigated. Through a comprehensive experimental approach combining series in situ crystallography, gas sorption isotherm measurements, and photomicroscopy, we elucidate the molecular-level mechanisms underlying this behaviour. The findings of this study reveal that gas molecules infiltrate the intricate 0D cavities within the crystal lattice, prompting subtle adjustments in molecular arrangement to accommodate the guest species. The molecular rearrangement (with no phase changes), manifested as an elongation of the crystallographic c axis, is observed across varying gas pressures and molecular environments. Notably, the empirical modelling of gas-induced elongation using the Sips equation provides valuable insights into the relationship between gas pressure and crystal expansion. The in-house instruments were utilized throughout this study to investigate the observed phenomena in the crystals AFRIKAANSE OPSOMMING: Die wisselwerking tussen eksterne stimuli en die strukturele eienskappe van kristallyne materiale hou onderdompel potensiaal in vir die ontwerp van nuwe funksionele materiale. In hierdie studie ondersoek ons die intrigerende verskynsel van omkeerbare verlenging van 'n organiese kristal in reaksie op gasdruk (koolstofdioksied en etileen). Deur middel van 'n omvattende eksperimentele benadering wat reekse in situ kristallografie, gassorpsie-isotermmetings en fotomikroskopie kombineer, verduidelik ons die molekulêre vlak meganismes onderliggend aan hierdie gedrag. Ons bevindings toon dat gasmolekules die ingewikkelde 0D-holtes binne die kristalrooster infiltreer, wat subtiele aanpassings in molekulêre rangskikking veroorsaak om die gasspesies te akkommodeer. Die molekulêre herrangskikking (sonder faseveranderings), wat manifesteer as 'n verlenging van die kristallografiese c-as, word waargeneem oor verskillende gasdruk en molekulêre omgewings. Die empiriese modellering van gas-geïnduseerde verlenging met behulp van Sips-vergelyking bied veral waardevolle insigte in die verband tussen gasdruk en kristaluitbreiding. Die interne instrumente is gedurende hierdie studie gebruik om die waargenome verskynsels in die kristalle te ondersoek. Masters 2024-03-04T14:40:02Z 2024-04-26T19:24:00Z 2024-03-04T14:40:02Z 2024-04-26T19:24:00Z 2024-03 Thesis https://scholar.sun.ac.za/handle/10019.1/130487 en_ZA en_ZA Stellenbosch University viii, 75 pages : illustrations application/pdf Stellenbosch : Stellenbosch University |
| spellingShingle | Crystallography Porous materials -- Thermal properties Expansion (Heat) Hydrostatic pressure Molecular crystals Mathada, Gundo Expansion of a porous organic molecular material induced by gas pressure |
| title | Expansion of a porous organic molecular material induced by gas pressure |
| title_full | Expansion of a porous organic molecular material induced by gas pressure |
| title_fullStr | Expansion of a porous organic molecular material induced by gas pressure |
| title_full_unstemmed | Expansion of a porous organic molecular material induced by gas pressure |
| title_short | Expansion of a porous organic molecular material induced by gas pressure |
| title_sort | expansion of a porous organic molecular material induced by gas pressure |
| topic | Crystallography Porous materials -- Thermal properties Expansion (Heat) Hydrostatic pressure Molecular crystals |
| url | https://scholar.sun.ac.za/handle/10019.1/130487 |
| work_keys_str_mv | AT mathadagundo expansionofaporousorganicmolecularmaterialinducedbygaspressure |