Layer-by-layer modification effects on a nanopore's inner surface of polycarbonate track-etched membranes
The control of the morphology, as well as the physical and chemical properties, of nanopores is a key issue for many applications. Reducing pore size is important in nanopore-based sensing applications as it helps to increase sensitivity. Changes of other physical properties such as surface net char...
| Authors: | ; ; ; |
|---|---|
| Format: | Article |
| Publication date: | 2020 |
| Country: | España |
| Institution: | Universitat Politècnica de Catalunya (UPC) |
| Repository: | UPCommons. Portal del coneixement obert de la UPC |
| Language: | English |
| OAI Identifier: | oai:upcommons.upc.edu:2117/334009 |
| Online Access: | https://hdl.handle.net/2117/334009 https://dx.doi.org/10.1039/d0ra05322h |
| Access Level: | Open access |
| Keyword: | Nanotechnology Nanoscience Bioengineering Nanopores Nanotecnologia Nanociència Bioenginyeria Nanoporus Àrees temàtiques de la UPC::Enginyeria química |
| _version_ | 1878729505700315136 |
|---|---|
| author | Paoli, Roberto |
| author2 | Engel López, Elisabeth|||0000-0003-4855-8874 Homs-Corbera, A Samitier Martí, Josep |
| author2_role | author author author |
| author_browse | Engel López, Elisabeth|||0000-0003-4855-8874 Homs-Corbera, A Paoli, Roberto Samitier Martí, Josep |
| author_facet | Paoli, Roberto Engel López, Elisabeth|||0000-0003-4855-8874 Homs-Corbera, A Samitier Martí, Josep |
| author_role | author |
| collection | UPCommons. Portal del coneixement obert de la UPC |
| description | The control of the morphology, as well as the physical and chemical properties, of nanopores is a key issue for many applications. Reducing pore size is important in nanopore-based sensing applications as it helps to increase sensitivity. Changes of other physical properties such as surface net charge can also modify transport selectivity of the pores. We have studied how polyelectrolyte layer-by-layer (LBL) surface modification can be used to change the characteristics of nanoporous membranes. Studies were performed with a custom made three-dimensional multilayer microfluidic device able to fit membrane samples. The device allowed us to efficiently control LBL film deposition over blank low-cost commercially available polycarbonate track-etched (PCTE) membranes. We have demonstrated pore diameter reduction and deposition of the layers inside the pores through confocal and SEM images. Posterior impedance measurement studies served to evaluate experimentally the effect of the LBL deposition on the net inner nanopore surface charge and diameter. Measurements using direct current (DC) and alternative current (AC) voltages have demonstrated contrasted behaviors depending on the number and parity of deposited opposite charge layers. PCTE membranes are originally negatively charged and results evidenced higher impedance increases for paired charge LBL depositions. Impedance decreased when an unpaired positive layer was added. These results showed a different influence on the overall ion motility due to the effect of different surface charges. Results have been fit into a model that suggested a strong dependence of nanopores' impedance module to surface charge on conductive buffers, such as Phosphate Buffer Saline (PBS), even on relatively large nanopores. In AC significant differences between paired and unpaired charged LBL depositions tended to disappear as the total number of layers increased. |
| eu_rights_str_mv | openAccess |
| format | article |
| id | ES_0941bcdc9a7669bd4e93bcfcfa009acd |
| institution | Universitat Politècnica de Catalunya (UPC) |
| instname_str | Universitat Politècnica de Catalunya (UPC) |
| language | eng |
| network_acronym_str | ES |
| network_name_str | España |
| oai_identifier_str | oai:upcommons.upc.edu:2117/334009 |
| publishDate | 2020 |
| publishDateSort | 2020 |
| publisher | Royal Society of Chemistry (RSC) |
| publisherStr | Royal Society of Chemistry (RSC) |
| reponame_str | UPCommons. Portal del coneixement obert de la UPC |
| spelling | Layer-by-layer modification effects on a nanopore's inner surface of polycarbonate track-etched membranes Paoli, Roberto Engel López, Elisabeth|||0000-0003-4855-8874 Homs-Corbera, A Samitier Martí, Josep Nanotechnology Nanoscience Bioengineering Nanopores Nanotecnologia Nanociència Bioenginyeria Nanoporus Àrees temàtiques de la UPC::Enginyeria química The control of the morphology, as well as the physical and chemical properties, of nanopores is a key issue for many applications. Reducing pore size is important in nanopore-based sensing applications as it helps to increase sensitivity. Changes of other physical properties such as surface net charge can also modify transport selectivity of the pores. We have studied how polyelectrolyte layer-by-layer (LBL) surface modification can be used to change the characteristics of nanoporous membranes. Studies were performed with a custom made three-dimensional multilayer microfluidic device able to fit membrane samples. The device allowed us to efficiently control LBL film deposition over blank low-cost commercially available polycarbonate track-etched (PCTE) membranes. We have demonstrated pore diameter reduction and deposition of the layers inside the pores through confocal and SEM images. Posterior impedance measurement studies served to evaluate experimentally the effect of the LBL deposition on the net inner nanopore surface charge and diameter. Measurements using direct current (DC) and alternative current (AC) voltages have demonstrated contrasted behaviors depending on the number and parity of deposited opposite charge layers. PCTE membranes are originally negatively charged and results evidenced higher impedance increases for paired charge LBL depositions. Impedance decreased when an unpaired positive layer was added. These results showed a different influence on the overall ion motility due to the effect of different surface charges. Results have been fit into a model that suggested a strong dependence of nanopores' impedance module to surface charge on conductive buffers, such as Phosphate Buffer Saline (PBS), even on relatively large nanopores. In AC significant differences between paired and unpaired charged LBL depositions tended to disappear as the total number of layers increased. Peer Reviewed Royal Society of Chemistry (RSC) https://hdl.handle.net/2117/334009 https://dx.doi.org/10.1039/d0ra05322h |
| spellingShingle | Layer-by-layer modification effects on a nanopore's inner surface of polycarbonate track-etched membranes Paoli, Roberto Nanotechnology Nanoscience Bioengineering Nanopores Nanotecnologia Nanociència Bioenginyeria Nanoporus Àrees temàtiques de la UPC::Enginyeria química |
| title | Layer-by-layer modification effects on a nanopore's inner surface of polycarbonate track-etched membranes |
| title_full | Layer-by-layer modification effects on a nanopore's inner surface of polycarbonate track-etched membranes |
| title_fullStr | Layer-by-layer modification effects on a nanopore's inner surface of polycarbonate track-etched membranes |
| title_full_unstemmed | Layer-by-layer modification effects on a nanopore's inner surface of polycarbonate track-etched membranes |
| title_short | Layer-by-layer modification effects on a nanopore's inner surface of polycarbonate track-etched membranes |
| title_sort | Layer-by-layer modification effects on a nanopore's inner surface of polycarbonate track-etched membranes |
| topic | Nanotechnology Nanoscience Bioengineering Nanopores Nanotecnologia Nanociència Bioenginyeria Nanoporus Àrees temàtiques de la UPC::Enginyeria química |
| topic_facet | Nanotechnology Nanoscience Bioengineering Nanopores Nanotecnologia Nanociència Bioenginyeria Nanoporus Àrees temàtiques de la UPC::Enginyeria química |
| url | https://hdl.handle.net/2117/334009 https://dx.doi.org/10.1039/d0ra05322h |