Results - Details
Search command : Author="Βαμβακάκη"
And Author="Μαρία"
Current Record: 64 of 75
|
Identifier |
000390261 |
Title |
Synthesis and characterization of porous polymer nanoparticles for gas separation applications |
Author
|
Φλουράκη, Χαρίκλεια
|
Thesis advisor
|
Βαμβακάκη, Μαρία
Καλύβα, Μαρία
|
Reviewer
|
Πετεκίδης, Γεώργιος
Αρματάς, Γεράσιμος
|
Abstract |
In the past decades, environmental issues have attracted a lot of research attention
due to climate changes, global warming and limitations of the energy resources. The
rising levels of CO2 emissions causing global warming demand the development of
novel processes based on advanced materials for CO2 capture. Moreover, a promising
solution both environmentally and economically for the energy power problem is
biogas which consists mainly of methane (CH4 ~55-80 vol %) and CO2 (~20-45 vol
%). However, to be effective as a fuel, biogas has first to be purified from its
substantial amount of CO2 and the lower fraction of H2S (~0-1 vol %), since these
gases reduce its energy content and also lead to the corrosion of the natural gas
pipelines. Microporous organic polymers with certain properties including large
surface areas, narrow pore size distribution, and high chemical and thermal stability
are excellent candidates for potential applications in gas capture and separation. In
response to that, we report a simple and facile method for the synthesis of porous
porphyrin containing polystyrene particles.
The synthesis is based on the development of a tetra-methacrylate functionalized
porphyrin derivative via an esterification reaction of a tetrahydroxy porphyrin
analogue which served as a tetra-functional cross-linker.The porous cross-linked
polymer nanoparticles were synthesized by free-radical emulsion copolymerization of
styrene (St) with the tetra-methacrylate functionalized monomer 5,10,15,20-
Tetrakis(4-hydroxylphenyl)-21H,23H-porphine (PO) and the bifunctional cross-linker
divinylbenzene (DVB). The cross-link density of the polymer network was varied by
keeping the St/cross-linker mole ratio constant at 40/60 and progressively increasing
the PO mole ratio from 0.9 to 12 mole % with respect to the total monomer and crosslinker
content. The morphology and the size of the nanoparticles were characterized
by scanning electron microscopy (SEM), transmission electron microscopy (TEM)
and dynamic light scattering (DLS) measurements. The experimental fraction of the
porphyrin moieties incorporated within the particles was determined by UV/Vis
measurements. The permanent porosity of the PO-S-D materials was confirmed by
nitrogen and carbon dioxide adsorption experiments. Analysis of the adsorption data
using the ideal adsorption solution theory revealed the potential use of these materials
in CO2/CH4 separation applications.
|
Language |
English, Greek |
Subject |
Gas Separation |
|
Polymer |
|
Porphyrin |
Issue date |
2014-11-21 |
Collection
|
School/Department--School of Sciences and Engineering--Department of Materials Science and Technology--Post-graduate theses
|
|
Type of Work--Post-graduate theses
|
Permanent Link |
https://elocus.lib.uoc.gr//dlib/9/5/c/metadata-dlib-1423760945-125507-1365.tkl
|
Views |
278 |