Compression and shear surface rheology in spread layers of β-casein and β-lactoglobulin

Cicuta, Pietro

doi:10.1016/j.jcis.2006.12.056

Cited by 58 publications

(35 citation statements)

References 33 publications

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“…60 The dilational viscosity shows a strong shear-thinning behavior that can be described by a power law: κ ∼ ω −f , with f ≈ 0.6 ± 0.1 that suggests a solidlike description of the system. 62 As stated above, the characteristic time of a relaxation process depends on the diffusion coefficient and on the spatial scale a on which it operates, more precisely τ ∼ a 2 /D. 61 The same powerlike behavior has been obtained for dilational experiments at low frequencies not only for the present system, but also for other polymer monolayers in similar conditions.…”

Section: High Frequency Rheology: Capillary Waves Experimentssupporting

confidence: 77%

Rheology of poly(methyl methacrylate) Langmuir monolayers: Percolation transition to a soft glasslike system

Maestro

Ortega

Rubio

et al. 2011

The Journal of Chemical Physics

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An experimental study of the equilibrium properties and of the surface rheology of Langmuir monolayers of poly(methyl methacrylate) (PMMA) at the air/water interface has been carried out as a function of polymer concentration (Γ) and molecular weight (M(w)). Dilational and shear complex elasticity moduli covering a frequency range from 10(-3) to 0.2 Hz have been discussed. It was found that the air∕water interface behaves as a poor solvent for PMMA monolayers, thus suggesting that the polymer coils take collapsed soft-disks (pancakes) shape at the interface. The equilibrium and dynamic results suggest a fluid-to-soft-glass transition as the polymer concentration increases above a critical packing fraction at constant temperature. This two-dimensional transition is in agreement with results previously discussed for the dilational rheology of poly(4-hydroxystyrene) [F. Monroy, F. Ortega, R. G. Rubio, H. Ritacco, and D. Langevin, J. Chem. Phys. 95, 056103 (2005)]. Furthermore, the Γ-dependence of the relaxation dynamics of the monolayers suggests that the gel state may be considered as a fragile soft glass.

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Section: High Frequency Rheology: Capillary Waves Experimentssupporting

confidence: 77%

Rheology of poly(methyl methacrylate) Langmuir monolayers: Percolation transition to a soft glasslike system

Maestro

Ortega

Rubio

et al. 2011

The Journal of Chemical Physics

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“…tial capture the stress relaxation behavior, in contrast with viscoelastic monolayers of soft colloids at interfaces such as protein monolayers, which have relaxation following a stretched exponential decay [23]. The nonuniform rate of change of area over the surface of a pendant drop results in gradients in surface coverage, which could produce unaccounted for Marangoni stresses.…”

mentioning

confidence: 99%

Interactions and Stress Relaxation in Monolayers of Soft Nanoparticles at Fluid-Fluid Interfaces

et al. 2015

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Nanoparticles with grafted layers of ligand molecules behave as soft colloids when they adsorb at fluidfluid interfaces. The ligand brush can deform and reconfigure, adopting a lens-shaped configuration at the interface. This behavior strongly affects the interactions between soft nanoparticles at fluid-fluid interfaces, which have proven challenging to probe experimentally. We measure the surface pressure for a stable 2D interfacial suspension of nanoparticles grafted with ligands, and extract the interaction potential from these data by comparison to Brownian dynamics simulations. A soft repulsive potential with an exponential form accurately reproduces the measured surface pressure data. A more realistic interaction potential model is also fitted to the data to provide insights into the ligand configuration at the interface. The stress of the 2D interfacial suspension upon step compression exhibits a single relaxation time scale, which is also attributable to ligand reconfiguration.

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“…Adsorbed and spread films of these pure caseins generally exhibit liquid-like flow behaviour with a low surface shear viscosity and very low shear modulus (Cicuta, 2007;Dickinson, Rolfe, & Dalgleish, 1988;Graham & Phillips, 1980b), albeit with some indication of physical gel-like behaviour in aged films made at higher concentrations (Bantchev & Schwartz, 2003).…”

Section: Representations Of Food Proteins At Interfaces As Polymers Omentioning

confidence: 99%

Exploring the frontiers of colloidal behaviour where polymers and particles meet

Dickinson

2016

Food Hydrocolloids

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Compression and shear surface rheology in spread layers of β-casein and β-lactoglobulin

Cited by 58 publications

References 33 publications

Rheology of poly(methyl methacrylate) Langmuir monolayers: Percolation transition to a soft glasslike system

Rheology of poly(methyl methacrylate) Langmuir monolayers: Percolation transition to a soft glasslike system

Interactions and Stress Relaxation in Monolayers of Soft Nanoparticles at Fluid-Fluid Interfaces

Exploring the frontiers of colloidal behaviour where polymers and particles meet

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