Surface interaction forces of cellulose nanocrystals grafted with thermoresponsive polymer brushes

The colloidal stability and thermoresponsive behavior of poly(N-isopropylacrylamide) brushes grafted from cellulose nanocrystals (CNCs) of varying graft densities and molecular weights was investigated. Indication of the grafted polymer brushes was obtained after AFM imaging of CNCs adsorbed on sili...

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Detalhes bibliográficos
Autores: Zoppe, Justin Orazio|||0000-0002-3599-9227, Osterberg, Monika, Venditti, Richard A., Laine, Janne, Rojas, Orlando J.
Tipo de documento: artigo
Data de publicação:2011
País:España
Recursos:Universitat Politècnica de Catalunya (UPC)
Repositório:UPCommons. Portal del coneixement obert de la UPC
Idioma:inglês
OAI Identifier:oai:upcommons.upc.edu:2117/335997
Acesso em linha:https://hdl.handle.net/2117/335997
https://dx.doi.org/10.1021/BM200551P
Access Level:Acceso aberto
Palavra-chave:Cellulose
Nanocrystals
Cel·lulosa
Nanocristalls
Àrees temàtiques de la UPC::Enginyeria dels materials
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spelling Surface interaction forces of cellulose nanocrystals grafted with thermoresponsive polymer brushesZoppe, Justin Orazio|||0000-0002-3599-9227Osterberg, MonikaVenditti, Richard A.Laine, JanneRojas, Orlando J.CelluloseNanocrystalsCel·lulosaNanocristallsÀrees temàtiques de la UPC::Enginyeria dels materialsThe colloidal stability and thermoresponsive behavior of poly(N-isopropylacrylamide) brushes grafted from cellulose nanocrystals (CNCs) of varying graft densities and molecular weights was investigated. Indication of the grafted polymer brushes was obtained after AFM imaging of CNCs adsorbed on silica. Also, aggregation of the nanoparticles carrying grafts of high degree of polymerization was observed. The responsiveness of grafted CNCs in aqueous dispersions and as an ultrathin film was evaluated by using light scattering, viscosimetry, and colloidal probe microscopy (CPM). Light transmittance measurements showed temperature-dependent aggregation originating from the different graft densities and molecular weights. The lower critical solution temperature (LCST) of grafted poly(NiPAAm) brushes was found to decrease with the ionic strength, as is the case for free poly(NiPAAm) in aqueous solution. Thermal responsive behavior of grafted CNCs in aqueous dispersions was observed by a sharp increase in dispersion viscosity as the temperature approached the LCST. CPM in liquid media for asymmetric systems consisting of ultrathin films of CNCs and a colloidal silica probe showed the distinctive effects of the grafted polymer brushes on interaction and adhesive forces. The origin of such forces was found to be mainly electrostatic and steric in the case of bare and grafted CNCs, respectively. A decrease in the onset of attractive and adhesion forces of grafted CNCs films were observed with the ionic strength of the aqueous solution. The decreased mobility of polymer brushes upon partial collapse and decreased availability of hydrogen bonding sites with higher electrolyte concentration were hypothesized as the main reasons for the less prominent polymer bridging between interacting surfaces.Peer Reviewed20112011-07-1120212021-01-26journal articlehttp://purl.org/coar/resource_type/c_6501AMhttp://purl.org/coar/version/c_ab4af688f83e57aainfo:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/2117/335997https://dx.doi.org/10.1021/BM200551Preponame:UPCommons. Portal del coneixement obert de la UPCinstname:Universitat Politècnica de Catalunya (UPC)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2Attribution-NonCommercial-NoDerivs 3.0 Spainhttp://creativecommons.org/licenses/by-nc-nd/3.0/es/info:eu-repo/semantics/openAccessoai:upcommons.upc.edu:2117/3359972026-05-27T15:37:01Z
dc.title.none.fl_str_mv Surface interaction forces of cellulose nanocrystals grafted with thermoresponsive polymer brushes
title Surface interaction forces of cellulose nanocrystals grafted with thermoresponsive polymer brushes
spellingShingle Surface interaction forces of cellulose nanocrystals grafted with thermoresponsive polymer brushes
Zoppe, Justin Orazio|||0000-0002-3599-9227
Cellulose
Nanocrystals
Cel·lulosa
Nanocristalls
Àrees temàtiques de la UPC::Enginyeria dels materials
title_short Surface interaction forces of cellulose nanocrystals grafted with thermoresponsive polymer brushes
title_full Surface interaction forces of cellulose nanocrystals grafted with thermoresponsive polymer brushes
title_fullStr Surface interaction forces of cellulose nanocrystals grafted with thermoresponsive polymer brushes
title_full_unstemmed Surface interaction forces of cellulose nanocrystals grafted with thermoresponsive polymer brushes
title_sort Surface interaction forces of cellulose nanocrystals grafted with thermoresponsive polymer brushes
dc.creator.none.fl_str_mv Zoppe, Justin Orazio|||0000-0002-3599-9227
Osterberg, Monika
Venditti, Richard A.
Laine, Janne
Rojas, Orlando J.
author Zoppe, Justin Orazio|||0000-0002-3599-9227
author_facet Zoppe, Justin Orazio|||0000-0002-3599-9227
Osterberg, Monika
Venditti, Richard A.
Laine, Janne
Rojas, Orlando J.
author_role author
author2 Osterberg, Monika
Venditti, Richard A.
Laine, Janne
Rojas, Orlando J.
author2_role author
author
author
author
dc.subject.none.fl_str_mv Cellulose
Nanocrystals
Cel·lulosa
Nanocristalls
Àrees temàtiques de la UPC::Enginyeria dels materials
topic Cellulose
Nanocrystals
Cel·lulosa
Nanocristalls
Àrees temàtiques de la UPC::Enginyeria dels materials
description The colloidal stability and thermoresponsive behavior of poly(N-isopropylacrylamide) brushes grafted from cellulose nanocrystals (CNCs) of varying graft densities and molecular weights was investigated. Indication of the grafted polymer brushes was obtained after AFM imaging of CNCs adsorbed on silica. Also, aggregation of the nanoparticles carrying grafts of high degree of polymerization was observed. The responsiveness of grafted CNCs in aqueous dispersions and as an ultrathin film was evaluated by using light scattering, viscosimetry, and colloidal probe microscopy (CPM). Light transmittance measurements showed temperature-dependent aggregation originating from the different graft densities and molecular weights. The lower critical solution temperature (LCST) of grafted poly(NiPAAm) brushes was found to decrease with the ionic strength, as is the case for free poly(NiPAAm) in aqueous solution. Thermal responsive behavior of grafted CNCs in aqueous dispersions was observed by a sharp increase in dispersion viscosity as the temperature approached the LCST. CPM in liquid media for asymmetric systems consisting of ultrathin films of CNCs and a colloidal silica probe showed the distinctive effects of the grafted polymer brushes on interaction and adhesive forces. The origin of such forces was found to be mainly electrostatic and steric in the case of bare and grafted CNCs, respectively. A decrease in the onset of attractive and adhesion forces of grafted CNCs films were observed with the ionic strength of the aqueous solution. The decreased mobility of polymer brushes upon partial collapse and decreased availability of hydrogen bonding sites with higher electrolyte concentration were hypothesized as the main reasons for the less prominent polymer bridging between interacting surfaces.
publishDate 2011
dc.date.none.fl_str_mv 2011
2011-07-11
2021
2021-01-26
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
AM
http://purl.org/coar/version/c_ab4af688f83e57aa
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/2117/335997
https://dx.doi.org/10.1021/BM200551P
url https://hdl.handle.net/2117/335997
https://dx.doi.org/10.1021/BM200551P
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution-NonCommercial-NoDerivs 3.0 Spain
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution-NonCommercial-NoDerivs 3.0 Spain
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:UPCommons. Portal del coneixement obert de la UPC
instname:Universitat Politècnica de Catalunya (UPC)
instname_str Universitat Politècnica de Catalunya (UPC)
reponame_str UPCommons. Portal del coneixement obert de la UPC
collection UPCommons. Portal del coneixement obert de la UPC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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