Dynamics of adsorption of hydroxypropyl methylcellulose at the air-water interface

Surface dynamic properties (surface pressure and surface dilatational properties) of three commercial hydroxypropyl methylcellulose (HPMC) adsorbed at the air-water interface are presented in this paper as a function of adsorption time. Experiments were performed at constant temperature (20 °C), pH...

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Detalles Bibliográficos
Autores principales: Pérez, Oscar E., Pilosof, Ana María Renata
Publicado: 2008
Materias:
Adsorption
air-water interface
Biopolymer
Brewster angle microscopy
Hydroxypropyl methylcellulose
Polysaccharide
Surface dilatational properties
Surface pressure
Surface rheology
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0268005X_v22_n3_p387_Perez
http://hdl.handle.net/20.500.12110/paper_0268005X_v22_n3_p387_Perez
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_0268005X_v22_n3_p387_Perez
record_format dspace
spelling paper:paper_0268005X_v22_n3_p387_Perez2023-06-08T15:23:44Z Dynamics of adsorption of hydroxypropyl methylcellulose at the air-water interface Pérez, Oscar E. Pilosof, Ana María Renata Adsorption air-water interface Biopolymer Brewster angle microscopy Hydroxypropyl methylcellulose Polysaccharide Surface dilatational properties Surface pressure Surface rheology Surface dynamic properties (surface pressure and surface dilatational properties) of three commercial hydroxypropyl methylcellulose (HPMC) adsorbed at the air-water interface are presented in this paper as a function of adsorption time. Experiments were performed at constant temperature (20 °C), pH 7, and ionic strength 0.05 M. The dynamics of adsorption and the surface dilatational properties were measured simultaneously for different food-grade HPMC (called E4M, E50LV, and F4M), at bulk concentrations (CHPMC) ranging from 1×10-4 to 1% wt. It was found that the surface pressure (π) increased with the HPMC bulk concentration, which may be associated with HPMC adsorption. These phenomena have been related to HPMC diffusion to the interface (at short adsorption time) and to molecular interactions (at long-term adsorption). The HPMC films behaved as viscoelastic as deduced from the surface dilatational elasticity (Ed) and the loss angle tangent (Tan δ) evolution upon time. The values of Ed showed different behavior with the HPMC bulk concentration, which reflect structural differences in the adsorbed film. Differences in the dynamics of adsorption and surface dilatational properties between different HPMCs have been related to molecular differences, such as the molecular weight, degree of substitution, molar substitution, etc. © 2007 Elsevier Ltd. All rights reserved. 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. 2008 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0268005X_v22_n3_p387_Perez http://hdl.handle.net/20.500.12110/paper_0268005X_v22_n3_p387_Perez
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
Biopolymer
Brewster angle microscopy
Hydroxypropyl methylcellulose
Polysaccharide
Surface dilatational properties
Surface pressure
Surface rheology
spellingShingle Adsorption
air-water interface
Biopolymer
Brewster angle microscopy
Hydroxypropyl methylcellulose
Polysaccharide
Surface dilatational properties
Surface pressure
Surface rheology
Pérez, Oscar E.
Pilosof, Ana María Renata
Dynamics of adsorption of hydroxypropyl methylcellulose at the air-water interface
topic_facet Adsorption
air-water interface
Biopolymer
Brewster angle microscopy
Hydroxypropyl methylcellulose
Polysaccharide
Surface dilatational properties
Surface pressure
Surface rheology
description Surface dynamic properties (surface pressure and surface dilatational properties) of three commercial hydroxypropyl methylcellulose (HPMC) adsorbed at the air-water interface are presented in this paper as a function of adsorption time. Experiments were performed at constant temperature (20 °C), pH 7, and ionic strength 0.05 M. The dynamics of adsorption and the surface dilatational properties were measured simultaneously for different food-grade HPMC (called E4M, E50LV, and F4M), at bulk concentrations (CHPMC) ranging from 1×10-4 to 1% wt. It was found that the surface pressure (π) increased with the HPMC bulk concentration, which may be associated with HPMC adsorption. These phenomena have been related to HPMC diffusion to the interface (at short adsorption time) and to molecular interactions (at long-term adsorption). The HPMC films behaved as viscoelastic as deduced from the surface dilatational elasticity (Ed) and the loss angle tangent (Tan δ) evolution upon time. The values of Ed showed different behavior with the HPMC bulk concentration, which reflect structural differences in the adsorbed film. Differences in the dynamics of adsorption and surface dilatational properties between different HPMCs have been related to molecular differences, such as the molecular weight, degree of substitution, molar substitution, etc. © 2007 Elsevier Ltd. All rights reserved.
author Pérez, Oscar E.
Pilosof, Ana María Renata
author_facet Pérez, Oscar E.
Pilosof, Ana María Renata
author_sort Pérez, Oscar E.
title Dynamics of adsorption of hydroxypropyl methylcellulose at the air-water interface
title_short Dynamics of adsorption of hydroxypropyl methylcellulose at the air-water interface
title_full Dynamics of adsorption of hydroxypropyl methylcellulose at the air-water interface
title_fullStr Dynamics of adsorption of hydroxypropyl methylcellulose at the air-water interface
title_full_unstemmed Dynamics of adsorption of hydroxypropyl methylcellulose at the air-water interface
title_sort dynamics of adsorption of hydroxypropyl methylcellulose at the air-water interface
publishDate 2008
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0268005X_v22_n3_p387_Perez
http://hdl.handle.net/20.500.12110/paper_0268005X_v22_n3_p387_Perez
work_keys_str_mv AT perezoscare dynamicsofadsorptionofhydroxypropylmethylcelluloseattheairwaterinterface
AT pilosofanamariarenata dynamicsofadsorptionofhydroxypropylmethylcelluloseattheairwaterinterface
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