Unusual Temperature-Induced Swelling of Ionizable Poly(N-isopropylacrylamide)-Based Microgels: Experimental and Theoretical Insights into its Molecular Origin
- Autores
- Giussi, Juan Martín; Velasco, Manuel Isaac; Longo, Gabriel Sebastian; Acosta, Rodolfo Hector; Azzaroni, Omar
- Año de publicación
- 2015
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- In the traditional view of temperature-driven volume phase transitions in PNIPAm-based microgelsolutions, a monotonic and sharp decrease in particle size occurs upon heating the solution abovethe volume phase transition temperature (VPTT). However, at sufficiently high microgelconcentrations and low salt conditions, our dynamic light scattering experiments reveal anunexpected non-monotonic evolution of particle size when increasing the solution temperature.These findings show that poly(N-isopropylacrylamide-co-methacrylic acid) (P(NIPAm-co-MAA))microgels swell upon heating the solution in the temperature range where NIPAM is water-soluble(i.e., below the VPPT). Further heating the microgel solution leads to microgel collapse as typicallyobserved at temperatures above the VPTT. This novel behavior depends on particle and saltconcentration. We have observed the expected monotonic temperature-response of P(NIPAm-co-MAA) microgel solutions at low particle density and high salt concentration. To gain insights intothe molecular origin of the unusual behavior of these microgel solutions, we have combined nuclearmagnetic resonance studies and molecular-level theoretical calculations of the system. A delicatebalance between inter-particle steric compressions and intra-microgel physical interactions andchemical equilibria determines the size of these microgels. Both steric compression, due to finitedensity, and hydrogen bond formation in the interior of the microgels favor a more compactparticle. On the contrary, at the pH of the experiments the acid-base equilibrium constraints thepolymer charge to increase, which favors particle swelling due to intra-microgel electrostaticrepulsions. This interplay between physical interactions and chemical equilibria occurring at thenanometer length-scale determines the unusual thermal-induced swelling of P(NIPAm-co-MAA)
Fil: Giussi, Juan Martín. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico la Plata. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas; Argentina. Universidad Nacional de La Plata; Argentina
Fil: Velasco, Manuel Isaac. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Córdoba. Instituto de Física "enrique Gaviola"; Argentina. Universidad Nacional de Córdoba; Argentina
Fil: Longo, Gabriel Sebastian. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico la Plata. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas; Argentina. Universidad Nacional de La Plata; Argentina
Fil: Acosta, Rodolfo Hector. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Córdoba. Instituto de Física "enrique Gaviola"; Argentina. Universidad Nacional de Córdoba; Argentina
Fil: Azzaroni, Omar. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico la Plata. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas; Argentina. Universidad Nacional de La Plata; Argentina - Materia
-
POLYMER
NIPAM
NMR - Nivel de accesibilidad
- acceso embargado
- Condiciones de uso
- https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
- Repositorio
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/5449
Ver los metadatos del registro completo
id |
CONICETDig_c3835fd308ccc875fe9a76c3c0e5aa36 |
---|---|
oai_identifier_str |
oai:ri.conicet.gov.ar:11336/5449 |
network_acronym_str |
CONICETDig |
repository_id_str |
3498 |
network_name_str |
CONICET Digital (CONICET) |
spelling |
Unusual Temperature-Induced Swelling of Ionizable Poly(N-isopropylacrylamide)-Based Microgels: Experimental and Theoretical Insights into its Molecular OriginGiussi, Juan MartínVelasco, Manuel IsaacLongo, Gabriel SebastianAcosta, Rodolfo HectorAzzaroni, OmarPOLYMERNIPAMNMRhttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1https://purl.org/becyt/ford/1.4https://purl.org/becyt/ford/1In the traditional view of temperature-driven volume phase transitions in PNIPAm-based microgelsolutions, a monotonic and sharp decrease in particle size occurs upon heating the solution abovethe volume phase transition temperature (VPTT). However, at sufficiently high microgelconcentrations and low salt conditions, our dynamic light scattering experiments reveal anunexpected non-monotonic evolution of particle size when increasing the solution temperature.These findings show that poly(N-isopropylacrylamide-co-methacrylic acid) (P(NIPAm-co-MAA))microgels swell upon heating the solution in the temperature range where NIPAM is water-soluble(i.e., below the VPPT). Further heating the microgel solution leads to microgel collapse as typicallyobserved at temperatures above the VPTT. This novel behavior depends on particle and saltconcentration. We have observed the expected monotonic temperature-response of P(NIPAm-co-MAA) microgel solutions at low particle density and high salt concentration. To gain insights intothe molecular origin of the unusual behavior of these microgel solutions, we have combined nuclearmagnetic resonance studies and molecular-level theoretical calculations of the system. A delicatebalance between inter-particle steric compressions and intra-microgel physical interactions andchemical equilibria determines the size of these microgels. Both steric compression, due to finitedensity, and hydrogen bond formation in the interior of the microgels favor a more compactparticle. On the contrary, at the pH of the experiments the acid-base equilibrium constraints thepolymer charge to increase, which favors particle swelling due to intra-microgel electrostaticrepulsions. This interplay between physical interactions and chemical equilibria occurring at thenanometer length-scale determines the unusual thermal-induced swelling of P(NIPAm-co-MAA)Fil: Giussi, Juan Martín. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico la Plata. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas; Argentina. Universidad Nacional de La Plata; ArgentinaFil: Velasco, Manuel Isaac. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Córdoba. Instituto de Física "enrique Gaviola"; Argentina. Universidad Nacional de Córdoba; ArgentinaFil: Longo, Gabriel Sebastian. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico la Plata. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas; Argentina. Universidad Nacional de La Plata; ArgentinaFil: Acosta, Rodolfo Hector. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Córdoba. Instituto de Física "enrique Gaviola"; Argentina. Universidad Nacional de Córdoba; ArgentinaFil: Azzaroni, Omar. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico la Plata. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas; Argentina. Universidad Nacional de La Plata; ArgentinaRoyal Society of Chemistry2015-09info:eu-repo/date/embargoEnd/2016-10-03info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/5449Giussi, Juan Martín; Velasco, Manuel Isaac; Longo, Gabriel Sebastian; Acosta, Rodolfo Hector; Azzaroni, Omar; Unusual Temperature-Induced Swelling of Ionizable Poly(N-isopropylacrylamide)-Based Microgels: Experimental and Theoretical Insights into its Molecular Origin; Royal Society of Chemistry; Soft Matter; 11; 45; 9-2015; 8879-88861744-683Xenginfo:eu-repo/semantics/altIdentifier/pmid/26400774info:eu-repo/semantics/altIdentifier/doi/info:eu-repo/semantics/altIdentifier/url/http://pubs.rsc.org/en/Content/ArticleLanding/2015/SM/C5SM01853F#!divAbstractinfo:eu-repo/semantics/altIdentifier/doi/10.1039/C5SM01853Finfo:eu-repo/semantics/embargoedAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T09:34:33Zoai:ri.conicet.gov.ar:11336/5449instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 09:34:34.169CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse |
dc.title.none.fl_str_mv |
Unusual Temperature-Induced Swelling of Ionizable Poly(N-isopropylacrylamide)-Based Microgels: Experimental and Theoretical Insights into its Molecular Origin |
title |
Unusual Temperature-Induced Swelling of Ionizable Poly(N-isopropylacrylamide)-Based Microgels: Experimental and Theoretical Insights into its Molecular Origin |
spellingShingle |
Unusual Temperature-Induced Swelling of Ionizable Poly(N-isopropylacrylamide)-Based Microgels: Experimental and Theoretical Insights into its Molecular Origin Giussi, Juan Martín POLYMER NIPAM NMR |
title_short |
Unusual Temperature-Induced Swelling of Ionizable Poly(N-isopropylacrylamide)-Based Microgels: Experimental and Theoretical Insights into its Molecular Origin |
title_full |
Unusual Temperature-Induced Swelling of Ionizable Poly(N-isopropylacrylamide)-Based Microgels: Experimental and Theoretical Insights into its Molecular Origin |
title_fullStr |
Unusual Temperature-Induced Swelling of Ionizable Poly(N-isopropylacrylamide)-Based Microgels: Experimental and Theoretical Insights into its Molecular Origin |
title_full_unstemmed |
Unusual Temperature-Induced Swelling of Ionizable Poly(N-isopropylacrylamide)-Based Microgels: Experimental and Theoretical Insights into its Molecular Origin |
title_sort |
Unusual Temperature-Induced Swelling of Ionizable Poly(N-isopropylacrylamide)-Based Microgels: Experimental and Theoretical Insights into its Molecular Origin |
dc.creator.none.fl_str_mv |
Giussi, Juan Martín Velasco, Manuel Isaac Longo, Gabriel Sebastian Acosta, Rodolfo Hector Azzaroni, Omar |
author |
Giussi, Juan Martín |
author_facet |
Giussi, Juan Martín Velasco, Manuel Isaac Longo, Gabriel Sebastian Acosta, Rodolfo Hector Azzaroni, Omar |
author_role |
author |
author2 |
Velasco, Manuel Isaac Longo, Gabriel Sebastian Acosta, Rodolfo Hector Azzaroni, Omar |
author2_role |
author author author author |
dc.subject.none.fl_str_mv |
POLYMER NIPAM NMR |
topic |
POLYMER NIPAM NMR |
purl_subject.fl_str_mv |
https://purl.org/becyt/ford/1.3 https://purl.org/becyt/ford/1 https://purl.org/becyt/ford/1.4 https://purl.org/becyt/ford/1 |
dc.description.none.fl_txt_mv |
In the traditional view of temperature-driven volume phase transitions in PNIPAm-based microgelsolutions, a monotonic and sharp decrease in particle size occurs upon heating the solution abovethe volume phase transition temperature (VPTT). However, at sufficiently high microgelconcentrations and low salt conditions, our dynamic light scattering experiments reveal anunexpected non-monotonic evolution of particle size when increasing the solution temperature.These findings show that poly(N-isopropylacrylamide-co-methacrylic acid) (P(NIPAm-co-MAA))microgels swell upon heating the solution in the temperature range where NIPAM is water-soluble(i.e., below the VPPT). Further heating the microgel solution leads to microgel collapse as typicallyobserved at temperatures above the VPTT. This novel behavior depends on particle and saltconcentration. We have observed the expected monotonic temperature-response of P(NIPAm-co-MAA) microgel solutions at low particle density and high salt concentration. To gain insights intothe molecular origin of the unusual behavior of these microgel solutions, we have combined nuclearmagnetic resonance studies and molecular-level theoretical calculations of the system. A delicatebalance between inter-particle steric compressions and intra-microgel physical interactions andchemical equilibria determines the size of these microgels. Both steric compression, due to finitedensity, and hydrogen bond formation in the interior of the microgels favor a more compactparticle. On the contrary, at the pH of the experiments the acid-base equilibrium constraints thepolymer charge to increase, which favors particle swelling due to intra-microgel electrostaticrepulsions. This interplay between physical interactions and chemical equilibria occurring at thenanometer length-scale determines the unusual thermal-induced swelling of P(NIPAm-co-MAA) Fil: Giussi, Juan Martín. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico la Plata. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas; Argentina. Universidad Nacional de La Plata; Argentina Fil: Velasco, Manuel Isaac. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Córdoba. Instituto de Física "enrique Gaviola"; Argentina. Universidad Nacional de Córdoba; Argentina Fil: Longo, Gabriel Sebastian. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico la Plata. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas; Argentina. Universidad Nacional de La Plata; Argentina Fil: Acosta, Rodolfo Hector. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Córdoba. Instituto de Física "enrique Gaviola"; Argentina. Universidad Nacional de Córdoba; Argentina Fil: Azzaroni, Omar. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico la Plata. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas; Argentina. Universidad Nacional de La Plata; Argentina |
description |
In the traditional view of temperature-driven volume phase transitions in PNIPAm-based microgelsolutions, a monotonic and sharp decrease in particle size occurs upon heating the solution abovethe volume phase transition temperature (VPTT). However, at sufficiently high microgelconcentrations and low salt conditions, our dynamic light scattering experiments reveal anunexpected non-monotonic evolution of particle size when increasing the solution temperature.These findings show that poly(N-isopropylacrylamide-co-methacrylic acid) (P(NIPAm-co-MAA))microgels swell upon heating the solution in the temperature range where NIPAM is water-soluble(i.e., below the VPPT). Further heating the microgel solution leads to microgel collapse as typicallyobserved at temperatures above the VPTT. This novel behavior depends on particle and saltconcentration. We have observed the expected monotonic temperature-response of P(NIPAm-co-MAA) microgel solutions at low particle density and high salt concentration. To gain insights intothe molecular origin of the unusual behavior of these microgel solutions, we have combined nuclearmagnetic resonance studies and molecular-level theoretical calculations of the system. A delicatebalance between inter-particle steric compressions and intra-microgel physical interactions andchemical equilibria determines the size of these microgels. Both steric compression, due to finitedensity, and hydrogen bond formation in the interior of the microgels favor a more compactparticle. On the contrary, at the pH of the experiments the acid-base equilibrium constraints thepolymer charge to increase, which favors particle swelling due to intra-microgel electrostaticrepulsions. This interplay between physical interactions and chemical equilibria occurring at thenanometer length-scale determines the unusual thermal-induced swelling of P(NIPAm-co-MAA) |
publishDate |
2015 |
dc.date.none.fl_str_mv |
2015-09 info:eu-repo/date/embargoEnd/2016-10-03 |
dc.type.none.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://purl.org/coar/resource_type/c_6501 info:ar-repo/semantics/articulo |
format |
article |
status_str |
publishedVersion |
dc.identifier.none.fl_str_mv |
http://hdl.handle.net/11336/5449 Giussi, Juan Martín; Velasco, Manuel Isaac; Longo, Gabriel Sebastian; Acosta, Rodolfo Hector; Azzaroni, Omar; Unusual Temperature-Induced Swelling of Ionizable Poly(N-isopropylacrylamide)-Based Microgels: Experimental and Theoretical Insights into its Molecular Origin; Royal Society of Chemistry; Soft Matter; 11; 45; 9-2015; 8879-8886 1744-683X |
url |
http://hdl.handle.net/11336/5449 |
identifier_str_mv |
Giussi, Juan Martín; Velasco, Manuel Isaac; Longo, Gabriel Sebastian; Acosta, Rodolfo Hector; Azzaroni, Omar; Unusual Temperature-Induced Swelling of Ionizable Poly(N-isopropylacrylamide)-Based Microgels: Experimental and Theoretical Insights into its Molecular Origin; Royal Society of Chemistry; Soft Matter; 11; 45; 9-2015; 8879-8886 1744-683X |
dc.language.none.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
info:eu-repo/semantics/altIdentifier/pmid/26400774 info:eu-repo/semantics/altIdentifier/doi/ info:eu-repo/semantics/altIdentifier/url/http://pubs.rsc.org/en/Content/ArticleLanding/2015/SM/C5SM01853F#!divAbstract info:eu-repo/semantics/altIdentifier/doi/10.1039/C5SM01853F |
dc.rights.none.fl_str_mv |
info:eu-repo/semantics/embargoedAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
eu_rights_str_mv |
embargoedAccess |
rights_invalid_str_mv |
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
dc.format.none.fl_str_mv |
application/pdf application/pdf application/pdf application/pdf |
dc.publisher.none.fl_str_mv |
Royal Society of Chemistry |
publisher.none.fl_str_mv |
Royal Society of Chemistry |
dc.source.none.fl_str_mv |
reponame:CONICET Digital (CONICET) instname:Consejo Nacional de Investigaciones Científicas y Técnicas |
reponame_str |
CONICET Digital (CONICET) |
collection |
CONICET Digital (CONICET) |
instname_str |
Consejo Nacional de Investigaciones Científicas y Técnicas |
repository.name.fl_str_mv |
CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas |
repository.mail.fl_str_mv |
dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar |
_version_ |
1844613069649477632 |
score |
13.070432 |