Temperature-Dependent Competition between Adsorption and Aggregation of a Cellulose Ether - Simultaneous Use of Optical and Acoustical Techniques for Investigating Surface Properties

Rasmus Bodvik, Lubica Macakova, Leif Karlson, Esben Thormann, Per M. Claesson

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Adsorption of the temperature-responsive polymer hydroxypropylmethylcellulose (HPMC) from an aqueous solution onto hydrophobized silica was followed well above the bulk instability temperature (T2) in temperature cycle experiments. Two complementary techniques, QCM-D and ellipsometry, were utilized simultaneously to probe the same substrate immersed in polymer solution. The interfacial processes were correlated with changes in polymer aggregation and viscosity of polymer solutions, as monitored by light scattering and rheological measurements. The simultaneous use of ellipsometry and QCM-D, and the possibility to follow layer properties up to 80 °C, well above the T2 temperature, are both novel developments. A moderate increase in adsorbed amount with temperature was found below T2, whereas a significant increase in the adsorbed mass and changes in layer properties were observed around the T2 temperature where the bulk viscosity increases significantly. Thus, there is a clear correlation between transition temperatures in the adsorbed layer and in bulk solution, and we discuss this in relation to a newly proposed model that considers competition between aggregation and adsorption/deposition. A much larger temperature response above the T2 temperature was found for adsorbed layers of HPMC than for layers of methyl cellulose. Possible reasons for this are discussed.
Original languageEnglish
JournalLangmuir
Volume28
Issue number25
Pages (from-to)9515-9525
ISSN0743-7463
DOIs
Publication statusPublished - 2012
Externally publishedYes

Cite this

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title = "Temperature-Dependent Competition between Adsorption and Aggregation of a Cellulose Ether - Simultaneous Use of Optical and Acoustical Techniques for Investigating Surface Properties",
abstract = "Adsorption of the temperature-responsive polymer hydroxypropylmethylcellulose (HPMC) from an aqueous solution onto hydrophobized silica was followed well above the bulk instability temperature (T2) in temperature cycle experiments. Two complementary techniques, QCM-D and ellipsometry, were utilized simultaneously to probe the same substrate immersed in polymer solution. The interfacial processes were correlated with changes in polymer aggregation and viscosity of polymer solutions, as monitored by light scattering and rheological measurements. The simultaneous use of ellipsometry and QCM-D, and the possibility to follow layer properties up to 80 °C, well above the T2 temperature, are both novel developments. A moderate increase in adsorbed amount with temperature was found below T2, whereas a significant increase in the adsorbed mass and changes in layer properties were observed around the T2 temperature where the bulk viscosity increases significantly. Thus, there is a clear correlation between transition temperatures in the adsorbed layer and in bulk solution, and we discuss this in relation to a newly proposed model that considers competition between aggregation and adsorption/deposition. A much larger temperature response above the T2 temperature was found for adsorbed layers of HPMC than for layers of methyl cellulose. Possible reasons for this are discussed.",
author = "Rasmus Bodvik and Lubica Macakova and Leif Karlson and Esben Thormann and Claesson, {Per M.}",
year = "2012",
doi = "10.1021/la301114f",
language = "English",
volume = "28",
pages = "9515--9525",
journal = "Langmuir",
issn = "0743-7463",
publisher = "American Chemical Society",
number = "25",

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Temperature-Dependent Competition between Adsorption and Aggregation of a Cellulose Ether - Simultaneous Use of Optical and Acoustical Techniques for Investigating Surface Properties. / Bodvik, Rasmus; Macakova, Lubica; Karlson, Leif; Thormann, Esben; Claesson, Per M.

In: Langmuir, Vol. 28, No. 25, 2012, p. 9515-9525.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Temperature-Dependent Competition between Adsorption and Aggregation of a Cellulose Ether - Simultaneous Use of Optical and Acoustical Techniques for Investigating Surface Properties

AU - Bodvik, Rasmus

AU - Macakova, Lubica

AU - Karlson, Leif

AU - Thormann, Esben

AU - Claesson, Per M.

PY - 2012

Y1 - 2012

N2 - Adsorption of the temperature-responsive polymer hydroxypropylmethylcellulose (HPMC) from an aqueous solution onto hydrophobized silica was followed well above the bulk instability temperature (T2) in temperature cycle experiments. Two complementary techniques, QCM-D and ellipsometry, were utilized simultaneously to probe the same substrate immersed in polymer solution. The interfacial processes were correlated with changes in polymer aggregation and viscosity of polymer solutions, as monitored by light scattering and rheological measurements. The simultaneous use of ellipsometry and QCM-D, and the possibility to follow layer properties up to 80 °C, well above the T2 temperature, are both novel developments. A moderate increase in adsorbed amount with temperature was found below T2, whereas a significant increase in the adsorbed mass and changes in layer properties were observed around the T2 temperature where the bulk viscosity increases significantly. Thus, there is a clear correlation between transition temperatures in the adsorbed layer and in bulk solution, and we discuss this in relation to a newly proposed model that considers competition between aggregation and adsorption/deposition. A much larger temperature response above the T2 temperature was found for adsorbed layers of HPMC than for layers of methyl cellulose. Possible reasons for this are discussed.

AB - Adsorption of the temperature-responsive polymer hydroxypropylmethylcellulose (HPMC) from an aqueous solution onto hydrophobized silica was followed well above the bulk instability temperature (T2) in temperature cycle experiments. Two complementary techniques, QCM-D and ellipsometry, were utilized simultaneously to probe the same substrate immersed in polymer solution. The interfacial processes were correlated with changes in polymer aggregation and viscosity of polymer solutions, as monitored by light scattering and rheological measurements. The simultaneous use of ellipsometry and QCM-D, and the possibility to follow layer properties up to 80 °C, well above the T2 temperature, are both novel developments. A moderate increase in adsorbed amount with temperature was found below T2, whereas a significant increase in the adsorbed mass and changes in layer properties were observed around the T2 temperature where the bulk viscosity increases significantly. Thus, there is a clear correlation between transition temperatures in the adsorbed layer and in bulk solution, and we discuss this in relation to a newly proposed model that considers competition between aggregation and adsorption/deposition. A much larger temperature response above the T2 temperature was found for adsorbed layers of HPMC than for layers of methyl cellulose. Possible reasons for this are discussed.

U2 - 10.1021/la301114f

DO - 10.1021/la301114f

M3 - Journal article

VL - 28

SP - 9515

EP - 9525

JO - Langmuir

JF - Langmuir

SN - 0743-7463

IS - 25

ER -