| 1. |
- Khorsand Kheirabad, Atefeh, 1991-
(författare)
-
Functional hybrid and composite porous membranes derived from imidazolium-type poly(ionic liquid)
- 2023
-
Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Poly(ionic liquid)s (PIL)s, as a subclass of polyelectrolytes, are composed of polymeric backbones with ionic liquid (IL)-based species in each repeating unit. Recent studies have deepened the understanding of the PIL concept in terms of characteristics, functions and applications in comparison to classical ILs and traditional polyelectrolytes. During the past two decades, PILs have developed themselves into an interdisciplinary subject among various research areas such as polymer science, materials science, catalysis, separation and sensing. Currently, the chemistry and applications of conventional polyelectrolytes are being expanded forward by the PIL concept. This PhD thesis deals with PIL-based porous hybrid and composite membranes. It is motivated by the growing demand on functional porous polymer membranes, in particularly, porous polyelectrolyte membranes in both industry and academia. By applying PILs as building blocks in membranes, the as-prepared porous PIL membranes combine certain desirable properties of ILs and common polymers with a wider potential to satisfy this demand. As a step further, the incorporation of functional guest substances on a molecular or nanoscale can enable new functionalities of porous membranes and broaden their application scope. The aim of this thesis is to develop synthetic approaches to fabricate porous PIL-based membranes based on hybridization and composition of a cationic PIL and a guest substance, and explore their diverse functions. Herein, fabrication methods based on two mechanisms were proposed and investigated. First, electrostatic complexation between a cationic hydrophobic PIL and a weak poly-/multi-acid. Second, ice-assisted phase separation of a hydrophobic PIL in water when in contact with a multi-acid compound as an ionic crosslinker. In following, task-specific functions were built up in porous PIL membranes via addition of specific metal-containing substances. This thesis content is inherently interdisciplinary, as it combines polymer chemistry and processing, membrane fabrication and materials science to secure its success in implementation, and this thesis advances the design and application scope of porous polyelectrolyte membranes.
|
|
| 2. |
- Khorsand Kheirabad, Atefeh, 1991-
(författare)
-
Ice-assisted Porous Poly(ionic liquid)/MXene Composite Membranes for Solar Steam Generation
-
Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
- Controlled regulation of polymer-based porous membranes via innovative methods is of considerable interest yet it remains a challenge. Herein, we established a general approach to fabricate porous polyelectrolyte composite membranes (PPCM)s from poly(ionic liquid) (PIL) and MXene via an ice-templating method. This process enabled the formation of a uniformly distributed macroporous structure within the membrane. The unique characteristics of the as-produced composite membranes displays significant light-to-heat conversion and excellent performance for solar-driven water vapor generation. This facile synthetic strategy breaks new grounds for developing composite porous membranes as high-performance solar steam generator for clean water production.
|
|
| 3. |
- Khorsand Kheirabad, Atefeh, 1991-, et al.
(författare)
-
Ice-assisted Porous Poly(ionic liquid)/MXene Composite Membranes for Solar Steam Generation
-
Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
- Controlled regulation of polymer-based porous membranes via innovative methods is of considerable interest yet it remains a challenge. Herein, we established a general approach to fabricate porous polyelectrolyte composite membranes (PPCM)s from poly(ionic liquid) (PIL) and MXene via an ice-templating method. This process enabled the formation of a uniformly distributed macroporous structure within the membrane. The unique characteristics of the as-produced composite membranes displays significant light-to-heat conversion and excellent performance for solar-driven water vapor generation. This facile synthetic strategy breaks new grounds for developing composite porous membranes as high-performance solar steam generator for clean water production.
|
|
| 4. |
- Khorsand Kheirabad, Atefeh, 1991-, et al.
(författare)
-
Ice-Assisted Porous Poly(ionic liquid)/MXene Composite Membranes for Solar Steam Generation
- 2023
-
Ingår i: ACS Applied Materials and Interfaces. - 1944-8244 .- 1944-8252. ; 15:48, s. 56347-56355
-
Tidskriftsartikel (refereegranskat)abstract
- Controlled synthesis of polymer-based porous membranes via innovative methods is of considerable interest, yet it remains a challenge. Herein, we established a general approach to fabricate porous polyelectrolyte composite membranes (PPCMs) from poly-(ionic liquid) (PIL) and MXene via an ice-assisted method. This process enabled the formation of a uniformly distributed macroporous structure within the membrane. The unique characteristics of the as-produced composite membranes display significant light-to-heat conversion and excellent performance for solar-driven water vapor generation. This facile synthetic strategy breaks new ground for developing composite porous membranes as high-performance solar steam generators for clean water production.
|
|
| 5. |
- Khorsand Kheirabad, Atefeh, 1991-
(författare)
-
MXene/Poly(ionic liquid) Porous Composite Membranes for Systematized Solar-driven Interfacial Steam Generation
-
Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
- Herein, we established a synthetic route towards MXene/poly(ionic liquid) (PIL) composite porous membranes as a new platform of solar-thermal conversion materials. These membranes were made by a base-triggered ionic crosslinking process between a cationic PIL and a weak polyacid in solution in the presence of dispersed MXene nanosheets. A three-dimensionally interconnected porous architecture was formed with MXene nanosheets uniformly distributed within it. The unique characteristics of the as-produced composite membranes displays significant light-to-heat conversion and excellent performance for solar-driven water vapor generation. This facile synthetic strategy opens a new avenue for developing composite porous membranes as solar absorbers for the solar-driven water production from natural resources.
|
|
| 6. |
- Khorsand Kheirabad, Atefeh, 1991-, et al.
(författare)
-
MXene/Poly(ionic liquid) Porous Composite Membranes for Systematized Solar-driven Interfacial Steam Generation
-
Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
- Herein, we established a synthetic route towards MXene/poly(ionic liquid) (PIL) composite porous membranes as a new platform of solar-thermal conversion materials. These membranes were made by a base-triggered ionic crosslinking process between a cationic PIL and a weak polyacid in solution in the presence of dispersed MXene nanosheets. A three-dimensionally interconnected porous architecture was formed with MXene nanosheets uniformly distributed within it. The unique characteristics of the as-produced composite membranes displays significant light-to-heat conversion and excellent performance for solar-driven water vapor generation. This facile synthetic strategy opens a new avenue for developing composite porous membranes as solar absorbers for the solar-driven water production from natural resources.
|
|
| 7. |
- Khorsand Kheirabad, Atefeh, 1991-, et al.
(författare)
-
MXene/poly(ionic liquid) porous composite membranes for systematized solar-driven interfacial steam generation
- 2023
-
Ingår i: 2D Materials. - : IOP Publishing. - 2053-1583. ; 10:2
-
Tidskriftsartikel (refereegranskat)abstract
- Herein, we established a synthetic route towards MXene/poly(ionic liquid) (PIL) composite porous membranes as a new platform of solar-thermal conversion materials. These membranes were made by a base-triggered ionic crosslinking process between a cationic PIL and a weak polyacid in solution in the presence of dispersed MXene nanosheets. A three-dimensionally interconnected porous architecture was formed with MXene nanosheets uniformly distributed within it. The unique characteristics of the as-produced composite membranes displays significant light-to-heat conversion and excellent performance for solar-driven water vapor generation. This facile synthetic strategy opens a new avenue for developing composite porous membranes as solar absorbers for the solar-driven water production from natural resources.
|
|
| 8. |
- Khorsand Kheirabad, Atefeh, 1991-, et al.
(författare)
-
Porous Poly(ionic liquid) Membranes and Ionic Organic Cages
- 2019
-
Konferensbidrag (refereegranskat)abstract
- This poster will present two topics that are active in our research group, the porous poly(ionic liquid) membranes and the ionic organic cages.Functional nanoporous polymer membranes with expanded surface area can be applied in broad fields, including separation, filtration, catalysis and energy applications. There are a number of established methods for the preparation of nanoporous membranes using neutral or weakly charged polymers. Although, fabrication of nanoporous polymer membranes from strong polyelectrolytes is far more difficult, we present our approach to nanoporous polyelectrolyte membranes by using poly(ionic liquid)s. [1] Poly(ionic liquid)s (PILs) are the polymerization products of ionic liquids, which combine certain properties and functions of polymeric materials (e,g. durability and good processability) and ILs (e.g. ion conductivity and thermal stability). We have exploited these favorable properties in the fabrication of nanoporous membranes from imidazolium based PILs through electrostatic complexation of PILs with polyacids. [2,3] The porous structure forms as a result of microphase separation of the hydrophobic PIL chains from the aqueous environment and is simultaneously stabilized by ionically crosslinked networks between the cationic PIL and the negatively charged neutralized polyacids. The membrane pore sizes can be tuned from nano- to micrometer scale by varying the degree of electrostatic complexation. In this meeting, we will update you with our latest progress in making nanoparticle-decorated nanoporous PIL membranes in a single step.In the ionic organic cage part, we present our work about operating ionic organic cages (I-cages) to enclose small noble metal clusters (MCs) with adaptivity to water-oil phase. Organic molecular cages are a kind of multifunctional materials with molecular solubility, intrinsic open channels and unique ability to accommodate guest objects such as (MCs). [4] Herein, we report physical confinement of small noble MCs inside I-cages. [5] Metal clusters (MCs) are small sized particles < 2nm with significant properties such as discrete electronic structures, intense photoluminescence, high catalytic activity (hydrogeneration, oxidation, and coupling reactions). Dominated synthesis methods of MCs includes the surface-binding ligand approach (amphiphilic capping agents, and water-oil phase transfer agents). [6]
|
|
| 9. |
- Khorsand Kheirabad, Atefeh, 1991-, et al.
(författare)
-
Porous Poly(ionic liquid) Membranes Functionalized with Metal Nanoparticles
- 2019
-
Konferensbidrag (refereegranskat)abstract
- Functional nanoporous polymer membranes with expanded surface area can be applied in broad fields, including separation, filtration, catalysis and energy applications. There are a number of established methods for the preparation of nanoporous membranes using neutral or weakly charged polymers. Although, fabrication of nanoporous polymer membranes from strong polyelectrolytes is far more difficult, we present our approach to nanoporous polyelectrolyte membranes by using poly(ionic liquid)s. [1]Poly(ionic liquid)s (PILs) are the polymerization products of ionic liquids (ILs), which combine certain properties and functions of polymeric materials (e,g. durability and good processability) and ILs (e.g. ion conductivity and thermal stability). We have exploited these favorable properties in the fabrication of nanoporous membranes from imidazolium based PILs through electrostatic complexation of PILs with polyacids. [2-4] The porous structure forms as a result of microphase separation of the hydrophobic PIL chains from the aqueous environment and is simultaneously stabilized by ionically crosslinked networks between the cationic PIL and the negatively charged neutralized polyacids. The as-obtained nanoporous membrane features a gradient profile in the cross-linking density along the membrane cross-section, triggered by the diffusive penetration of a base molecule from the top to the bottom into the PIL-polyacid blend film. The membrane pore sizes can be tuned from nano- to micrometer scale by varying the degree of electrostatic complexation.Furthermore, the membrane features high actuation speed in response to acetone vapor phase (also some other organic vapors) on account of its gradient in cross-linking density and the intrinsic porous nature of the membrane that enhances the internal mass transport. Such membranes may serve as environmental sensors to detect solvent quality. [5] In this meeting, we will update you with our latest progress in making nanoparticle-decorated nanoporous PIL membranes in a single step.
|
|
| 10. |
- Reiter, Manuel, et al.
(författare)
-
Siloxane-Based Main-Chain Poly(ionic liquid)s via a Debus-Radziszewski Reaction
- 2022
-
Ingår i: ACS Polymers Au. - : American Chemical Society (ACS). - 2694-2453. ; 2:2, s. 80-87
-
Tidskriftsartikel (refereegranskat)abstract
- Herein, we synthesized a series of siloxane-based poly(ionic liquid)s (PILs) with imidazolium-type species in the main chain via the multicomponent Debus–Radziszewski reaction. We employed oligodimethylsiloxane diamine precursors to integrate flexible spacers in the polymer backbone and ultimately succeeded in obtaining main-chain PILs with low glass transition temperatures (Tgs) in the range of −40 to −18 °C. Such PILs were combined with conventional hydrophobic vinylimidazolium-based PILs for the fabrication of porous membranes via interpolyelectrolyte complexation with poly(acrylic acid), which leads to enhanced mechanical performance in the tensile testing measurements. This study will enrich the structure library of main-chain PILs and open up more opportunities for potential industrial applications of porous imidazolium-based membranes.
|
|
