Hydroxypropylmethylcellulose surface activity at equilibrium and adsorption dynamics at the air-water and oil-water interfaces

The surface behaviour of hydroxypropylmethylcelluloses (HPMC) was studied at the air-water (A/W) and oil-water (O/W) interfaces. At the A/W interface, the π-C isotherms were sigmoidal and presented inflexions as the HPMC bulk concentration increases, related with different structural patterns adopte...

Descripción completa

Guardado en:
Detalles Bibliográficos
Autores principales: Camino, Nerina Andrea, Pérez, Oscar E., Pilosof, Ana María Renata
Publicado: 2009
Materias:
Adsorption
Air-water interface
Hydroxypropylmethylcellulose
Oil-water interface
Polysaccharide
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0268005X_v23_n8_p2359_Camino
http://hdl.handle.net/20.500.12110/paper_0268005X_v23_n8_p2359_Camino
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_0268005X_v23_n8_p2359_Camino
record_format dspace
spelling paper:paper_0268005X_v23_n8_p2359_Camino2023-06-08T15:23:47Z Hydroxypropylmethylcellulose surface activity at equilibrium and adsorption dynamics at the air-water and oil-water interfaces Camino, Nerina Andrea Pérez, Oscar E. Pilosof, Ana María Renata Adsorption Air-water interface Hydroxypropylmethylcellulose Oil-water interface Polysaccharide The surface behaviour of hydroxypropylmethylcelluloses (HPMC) was studied at the air-water (A/W) and oil-water (O/W) interfaces. At the A/W interface, the π-C isotherms were sigmoidal and presented inflexions as the HPMC bulk concentration increases, related with different structural patterns adopted by the biopolymer segments. The behaviour of these biopolymers at the O/W interface resulted different. No inflections in the adsorption isotherm were observed, denoting the absence of any change in the structure of the adsorbed monolayer. The order in the interfacial activity was different at the two interfaces. The dynamics of adsorption showed that the surface pressure (π) values and the rate of adsorption/penetration were lower at the O/W interface. Analogously to π values, the surface dilatational modulus was smallest at the O/W interface, however at long-term adsorption strong viscoelastic films are formed at the O/W interface. © 2009 Elsevier Ltd. All rights reserved. Fil:Camino, N.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Pérez, O.E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Pilosof, A.M.R. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2009 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0268005X_v23_n8_p2359_Camino http://hdl.handle.net/20.500.12110/paper_0268005X_v23_n8_p2359_Camino
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Adsorption
Air-water interface
Hydroxypropylmethylcellulose
Oil-water interface
Polysaccharide
spellingShingle Adsorption
Air-water interface
Hydroxypropylmethylcellulose
Oil-water interface
Polysaccharide
Camino, Nerina Andrea
Pérez, Oscar E.
Pilosof, Ana María Renata
Hydroxypropylmethylcellulose surface activity at equilibrium and adsorption dynamics at the air-water and oil-water interfaces
topic_facet Adsorption
Air-water interface
Hydroxypropylmethylcellulose
Oil-water interface
Polysaccharide
description The surface behaviour of hydroxypropylmethylcelluloses (HPMC) was studied at the air-water (A/W) and oil-water (O/W) interfaces. At the A/W interface, the π-C isotherms were sigmoidal and presented inflexions as the HPMC bulk concentration increases, related with different structural patterns adopted by the biopolymer segments. The behaviour of these biopolymers at the O/W interface resulted different. No inflections in the adsorption isotherm were observed, denoting the absence of any change in the structure of the adsorbed monolayer. The order in the interfacial activity was different at the two interfaces. The dynamics of adsorption showed that the surface pressure (π) values and the rate of adsorption/penetration were lower at the O/W interface. Analogously to π values, the surface dilatational modulus was smallest at the O/W interface, however at long-term adsorption strong viscoelastic films are formed at the O/W interface. © 2009 Elsevier Ltd. All rights reserved.
author Camino, Nerina Andrea
Pérez, Oscar E.
Pilosof, Ana María Renata
author_facet Camino, Nerina Andrea
Pérez, Oscar E.
Pilosof, Ana María Renata
author_sort Camino, Nerina Andrea
title Hydroxypropylmethylcellulose surface activity at equilibrium and adsorption dynamics at the air-water and oil-water interfaces
title_short Hydroxypropylmethylcellulose surface activity at equilibrium and adsorption dynamics at the air-water and oil-water interfaces
title_full Hydroxypropylmethylcellulose surface activity at equilibrium and adsorption dynamics at the air-water and oil-water interfaces
title_fullStr Hydroxypropylmethylcellulose surface activity at equilibrium and adsorption dynamics at the air-water and oil-water interfaces
title_full_unstemmed Hydroxypropylmethylcellulose surface activity at equilibrium and adsorption dynamics at the air-water and oil-water interfaces
title_sort hydroxypropylmethylcellulose surface activity at equilibrium and adsorption dynamics at the air-water and oil-water interfaces
publishDate 2009
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0268005X_v23_n8_p2359_Camino
http://hdl.handle.net/20.500.12110/paper_0268005X_v23_n8_p2359_Camino
work_keys_str_mv AT caminonerinaandrea hydroxypropylmethylcellulosesurfaceactivityatequilibriumandadsorptiondynamicsattheairwaterandoilwaterinterfaces
AT perezoscare hydroxypropylmethylcellulosesurfaceactivityatequilibriumandadsorptiondynamicsattheairwaterandoilwaterinterfaces
AT pilosofanamariarenata hydroxypropylmethylcellulosesurfaceactivityatequilibriumandadsorptiondynamicsattheairwaterandoilwaterinterfaces
_version_ 1768542837565030400

Ejemplares similares