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...

Descripción completa

Detalles Bibliográficos
Autores: Paoli, Roberto, Engel López, Elisabeth|||0000-0003-4855-8874, Homs-Corbera, A, Samitier Martí, Josep
Tipo de recurso: artículo
Fecha de publicación:2020
País:España
Institución:Universitat Politècnica de Catalunya (UPC)
Repositorio:UPCommons. Portal del coneixement obert de la UPC
Idioma:inglés
OAI Identifier:oai:upcommons.upc.edu:2117/334009
Acceso en línea:https://hdl.handle.net/2117/334009
https://dx.doi.org/10.1039/d0ra05322h
Access Level:acceso abierto
Palabra clave:Nanotechnology
Nanoscience
Bioengineering
Nanopores
Nanotecnologia
Nanociència
Bioenginyeria
Nanoporus
Àrees temàtiques de la UPC::Enginyeria química
id ES_0941bcdc9a7669bd4e93bcfcfa009acd
oai_identifier_str oai:upcommons.upc.edu:2117/334009
network_acronym_str ES
network_name_str España
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
title Layer-by-layer modification effects on a nanopore's inner surface of polycarbonate track-etched membranes
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_short 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_sort Layer-by-layer modification effects on a nanopore's inner surface of polycarbonate track-etched membranes
author Paoli, Roberto
author_facet Paoli, Roberto
Engel López, Elisabeth|||0000-0003-4855-8874
Homs-Corbera, A
Samitier Martí, Josep
author_role author
author2 Engel López, Elisabeth|||0000-0003-4855-8874
Homs-Corbera, A
Samitier Martí, Josep
author2_role author
author
author
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
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.
publishDate 2020
format article
url https://hdl.handle.net/2117/334009
https://dx.doi.org/10.1039/d0ra05322h
language eng
eu_rights_str_mv openAccess
publisher Royal Society of Chemistry (RSC)
institution Universitat Politècnica de Catalunya (UPC)
collection UPCommons. Portal del coneixement obert de la UPC
reponame_str UPCommons. Portal del coneixement obert de la UPC
instname_str Universitat Politècnica de Catalunya (UPC)
_version_ 1878431180672466944
publishDateSort 2020
author_browse Engel López, Elisabeth|||0000-0003-4855-8874
Homs-Corbera, A
Paoli, Roberto
Samitier Martí, Josep
publisherStr Royal Society of Chemistry (RSC)
score 6,924472

Similares en LA Referencia