Viscoelastic properties of insoluble amphiphiles at the air/water interface

Miano, Fausto; Winlove, C. Peter; Lambusta, Daniela; Marletta, Giovanni

doi:10.1016/j.jcis.2005.08.045

Cited by 14 publications

(13 citation statements)

References 24 publications

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“…Moreover, the appearance of recruitment index at the expansion isotherm is noteworthy. However, recruitment index is not as good as the DPPC/SP-C mixture reported in literature [43]. At X FHCL = 0.3, hysteresis behavior is the best among the others.…”

Section: Cyclic Compression-expansion Isothermscontrasting

confidence: 56%

“…In the surface dilatational elasticity measurements a drop was formed at the end of the tip of the needle and kept in an environmental chamber to prevent evaporation. After the drop was formed, pure DPPC or DPPC/FHCL mixture was injected to the surface of the droplet via a Hamilton syringe as described before [43]. The drop deformation (oscillation) was controlled through a computer controlled pumping system.…”

Section: Elasticity Measurementsmentioning

confidence: 99%

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Biophysical investigation of the interfacial properties of cationic fluorocarbon/hydrocarbon hybrid surfactant: Mimicking the lung surfactant protein C

Aydoğan

Uslu

Tanacı

2011

Journal of Colloid and Interface Science

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Section: Cyclic Compression-expansion Isothermscontrasting

confidence: 56%

Section: Elasticity Measurementsmentioning

confidence: 99%

Biophysical investigation of the interfacial properties of cationic fluorocarbon/hydrocarbon hybrid surfactant: Mimicking the lung surfactant protein C

Aydoğan

Uslu

Tanacı

2011

Journal of Colloid and Interface Science

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“…ODT apparatus and theory have been described elsewhere . In oscillating drop experiments, a Millipore water sessile drop is kept in a constant temperature and controlled humidity cell and recorded by a CCD camera.…”

Section: Methodsmentioning

confidence: 99%

“…To this aim, the low-frequency viscoelastic properties of several monolayers through the oscillating drop technique (ODT) have been studied on both air/water and oil/water interfaces …”

Section: Introductionmentioning

confidence: 99%

Structure–Rheology Relationship in Weakly Amphiphilic Block Copolymer Langmuir Monolayers

2014

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The linear viscoelastic behavior in the low-frequency regime at the water/air interface of three different polystyrene-b-poly(methyl methacrylate) (PS-b-PMMA) copolymer monolayers, with block length ratio varying from 66-33 to 50-50 and 25-75 in molecular units, was studied and related to the interfacial behavior, characterized by means of Langmuir isotherms, and their structure, characterized by means of the atomic force microscopy technique. The two monolayers with the highest PMMA amount showed a single phase transition at about 12 mN/m, the viscoelastic behavior changing from a predominantly elastic to a viscoelastic one. This change in the viscoelastic properties was ascribed to the beginning of entanglement among the PMMA coronas of the predominantly circular quasi-2D micelles formed by the two copolymer systems. Conversely, the polymer with the lowest PMMA amount, despite having the same PMMA block length of the PS-PMMA 50-50 block copolymer, was found to behave as a viscoelastic system at any surface pressure value. This characteristic behavior cannot therefore be simply related to the molecular weight difference, but it has been put in connection to the irregular micelle structure observed in this case, consisting of a mixture of spherical and wormlike micelles, and to the different conformation adopted by the PMMA block. By blending this copolymer with an immiscible elastic homopolymer, namely poly(2-vinylpyridine), it was possible to tune the micelle nanostructure, obtaining regular circular quasi-2D micelles, with viscoelastic properties as expected for the PMMA-rich copolymer monolayers. To the best of our knowledge, this study shows for the first time the explicit dependence upon the relative block length and, in turn, upon the nanostructure of the quasi-2D micelles, of the viscoelastic properties of Langmuir monolayers and suggests that molecular weight and intermolecular interactions are not the only parameters governing the polymer conformation and, in turn, the polymer rheology and dynamics in quasi-2D confined systems.

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“…[3] Therefore, the dynamic dilational properties on the adsorption layer of surfactant have been set store by many investigators in recent years. [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] Amphiphilic block copolymers have attracted widespread interest for both scientific and practical reasons. [21] These macromolecules adsorb at various interfaces and play a significant role in dispersion stabilization, foaming, and emulsification.…”

Section: Introductionmentioning

confidence: 99%

Comparison of the Surface Dilational Properties of Block Copolymers and Sodium Oleate Using the Oscillating Bubble Method

Xin

et al. 2010

Journal of Dispersion Science and Technology

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The surface dilational modulus of the star-like block copolymer AP432 and linear block copolymer L64 was studied using the oscillating bubble method at an accessible frequency range of 0.05 to 2 Hz, which was compared with anionic surfactant sodium oleate (C 17 H 33 COONa) and the influence of inorganic salt NaNO 3 on the surface dilational modulus of AP432 and L64 was also studied. The results indicate that for AP432 and L64 the dilational modulus varies slightly, just decrease gradually with concentrations increasing and never reaches high values with the dilational frequency increasing, but the dilational modulus of C 17 H 33 COONa increases gradually with the increase of dilational frequency and pass through the maximum values with increasing concentration. The properties of AP432, L64, and C 17 H 33 COONa at the air/water interface were also observed by surface tension measurement. Based on these experimental results, a simple possible adsorption model of these molecules at air/water interface is proposed.

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Viscoelastic properties of insoluble amphiphiles at the air/water interface

Cited by 14 publications

References 24 publications

Biophysical investigation of the interfacial properties of cationic fluorocarbon/hydrocarbon hybrid surfactant: Mimicking the lung surfactant protein C

Biophysical investigation of the interfacial properties of cationic fluorocarbon/hydrocarbon hybrid surfactant: Mimicking the lung surfactant protein C

Structure–Rheology Relationship in Weakly Amphiphilic Block Copolymer Langmuir Monolayers

Comparison of the Surface Dilational Properties of Block Copolymers and Sodium Oleate Using the Oscillating Bubble Method

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