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dc.contributor.author
Speyer, Kevin
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dc.contributor.author
Pastorino, Claudio
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dc.date.available
2021-01-21T12:11:35Z
dc.date.issued
2019-06
dc.identifier.citation
Speyer, Kevin; Pastorino, Claudio; Pressure responsive gating in nanochannels coated by semiflexible polymer brushes; Royal Society of Chemistry; Soft Matter; 15; 5; 6-2019; 937-946
dc.identifier.issn
1744-683X
dc.identifier.uri
http://hdl.handle.net/11336/123261
dc.description.abstract
We study by coarse-grained molecular-dynamics simulations the liquid flow in a slit channel with the inner walls coated by semiflexible polymer brushes. The distance between walls is close enough such that polymers grafted to opposing walls interact among each other and form bundles across the channel in poor solvent conditions. The solvent is simulated explicitly, including particles that fill the interior of the channel. The system is studied in equilibrium and under flow, by applying a constant body force on each particle of the system. A non-linear relation between external force and flow rate is observed, for a particular set of parameters. This non-linear response is linked to a morphological change of the polymer brushes. For large enough forces, the bundle structures formed across the channel break as the chains lean in the direction of the flow, and clear the middle of the channel. This morphological alteration of the polymer configurations translates in a sudden increase in the flow rate, acting as a pressure-responsive gate. The relation between flow and external force is investigated for various parameters, such as grafting density, quality of the solvent and polymer bending rigidity. We observe a non-monotonic dependence of the flow as a function of the polymer rigidity, and find an optimum value for the persistence length. We also find that the force threshold at which the morphological changes happen in the polymer brush, depends linearly on the grafting density. These findings can lead to new flow control techniques in micro and nano-fluidic devices.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Royal Society of Chemistry
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
POLYMER BRUSHES
dc.subject
MICROFLUIDICS
dc.subject
STIFFNESS
dc.subject
MOLECULAR DYNAMICS
dc.subject.classification
Física de los Materiales Condensados
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dc.subject.classification
Ciencias Físicas
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
Pressure responsive gating in nanochannels coated by semiflexible polymer brushes
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2020-12-16T18:34:55Z
dc.journal.volume
15
dc.journal.number
5
dc.journal.pagination
937-946
dc.journal.pais
Reino Unido
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dc.journal.ciudad
Cambridge
dc.description.fil
Fil: Speyer, Kevin. Comisión Nacional de Energía Atómica. Unidad Ejecutora Instituto de Nanociencia y Nanotecnología. - Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Unidad Ejecutora Instituto de Nanociencia y Nanotecnología; Argentina
dc.description.fil
Fil: Pastorino, Claudio. Comisión Nacional de Energía Atómica. Unidad Ejecutora Instituto de Nanociencia y Nanotecnología. - Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Unidad Ejecutora Instituto de Nanociencia y Nanotecnología; Argentina
dc.journal.title
Soft Matter
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/https://doi.org/10.1039/C8SM02388C
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