Perturbation–response relationship in liquid interfacial systems: non-linearity assessment by frequency–domain analysis

Loglio, G.; Pandolfini, P.; Miller, R.; Makievski, A. V.; Krägel, J.; Ravera, Francesca; Noskov, Boris A.

doi:10.1016/j.colsurfa.2004.10.130

Cited by 57 publications

(37 citation statements)

References 8 publications

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“…The experimental set-up and procedures were described in detail elsewhere [26,28,29], so that we present here only some basic principles of the employed techniques. The pendant drop was created at the tip of a PTFE capillary by a computer driven dosing system in a sealed glass cuvette, where a small portion of the solution under investigation was placed at the bottom in order to reduce drop evaporation.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Dynamic surface elasticity of polyelectrolyte/surfactant adsorption films at the air/water interface: Dodecyltrimethylammonium bromide and copolymer of sodium 2-acrylamido-2-methyl-1-propansulfonate with N-isopropylacrylamide

Noskov

Loglio

Lin

et al. 2006

Journal of Colloid and Interface Science

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Section: Methodsmentioning

confidence: 99%

“…The accuracy of the results depended on the relative surface area amplitude. Amplitudes ±10% ensure that the data were precise enough and at the same time the influence of non-linear effects was negligible [28,29].…”

Section: Methodsmentioning

confidence: 99%

Dynamic surface elasticity of polyelectrolyte/surfactant adsorption films at the air/water interface: Dodecyltrimethylammonium bromide and copolymer of sodium 2-acrylamido-2-methyl-1-propansulfonate with N-isopropylacrylamide

Noskov

Loglio

Lin

et al. 2006

Journal of Colloid and Interface Science

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“…In the literature, the THD-parameter was used to quantify the inaccuracies of dosing system and disturbances [35,36]. We show that THD is significantly influenced by a, but is not influenced by f. Generally, a nonlinearity appears at higher a. Saulnier et al [32] found that nonlinear phenomena appear for a DPPC monolayer when a > 10%.…”

Section: Dependence Of η and ε On Oscillation Frequency And Amplitudementioning

confidence: 97%

“…Inaccuracies of dosing and disturbances were quantified by the total harmonic distortion (THD) [35,36], expressed as a percentage of a 1 :…”

Section: Surface Rheology Measurementsmentioning

confidence: 99%

Surface rheology of monolayers of phospholipids and cholesterol measured with axisymmetric drop shape analysis

Vrânceanu

Winkler

Nirschl

et al. 2007

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Surface rheology of monolayers of a saturated phospholipid (dipalmitoylphosphatidylcholine, DPPC), an unsaturated phospholipid (dioleoylphosphatidylcholine, DOPC) and cholesterol is studied with axisymmetric drop shape analysis at the argon/water interface. Measurement techniques for lipids are described in detail. Profile analysis tensiometry (PAT) is used to determine the film pressure Π, surface elasticity and surface dilational viscosity of monolayers upon sinusoidal oscillations of the drop surface for various amplitudes a and frequencies f to assess their dependence on these dynamic parameters. It is shown that surface dilational viscosity strongly depends on the frequency and decreases by a factor 2-5 with increasing f in the considered range. Dilational viscosity is higher the more the monolayer approaches a relaxed state. Thus, the molecular interactions are stronger in the relaxed than in the stressed state. Surface elasticity is much less dependent on dynamic conditions. For DPPC a minimum of the dynamic surface elasticity is found for f = 12.5 mHz (at Π = 17.5 mN m −1 ) which coincides well with the relaxation frequencies measured in stress relaxation experiments. The dynamic surface elasticity of DPPC exhibits a plateau in the range 13.5 mN m −1 ≤ Π ≤ 27 mN m −1 in good coincidence with the phase boundaries of the coexistence region of micron-sized liquid crystalline domains surrounded by a fluid monolayer phase. In equilibrium measurements (Π/A-isotherms) a plateau of the film pressure is seen at the lower bound and a break at the upper bound of the coexistence region. Film pressure/area isotherms produced by PAT and a Langmuir film balance closely coincide as is shown in a comparison to literature values. However, the surface elasticities measured dynamically with oscillating surfaces widely deviate from those derived from isotherms in the case of DPPC and cholesterol, whereas for DOPC very good agreement can be found.

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“…The measurements of dynamic dilational viscoelasticity can be used to study the every single chemical and physical progress in the system and provide more information of the dynamics of polymer chains and their interaction with surfactant molecules at interface. [11][12][13][14] However, only recently has the dynamic surface viscoelasticity of polystyrene been studied, [15][16][17][18][19][20] while fewer studies were concerned with interfacial dilational properties of water-soluble polystyrene sulfonate adsorbed at oil-water interface. In this article, we have investigated the effect of molecular weight on interfacial dilational properties of water-soluble polystyrene sulfonate adsorbed at oil-water interface and expounded the interfacial interaction between polystyrene sulfonate and cationic=anionic=nonionic surfactant by using oscillating barriers method and interfacial tension relaxation method.…”

Section: Introductionmentioning

confidence: 99%

Effect of Molecular Weight on the Interfacial Dilational Viscoelasticity of Anionic Polyelectrolyte/Surfactant Systems

Fang

Zong

Leiting

et al. 2010

Journal of Dispersion Science and Technology

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In this article, the effect of molecular weight on the interfacial tension and interfacial dilational viscoelasticity of polystyrene sulfonate/surfactant adsorption films at the water-octane interface have been studied by spinning drop method and oscillating barriers method respectively. The experimental results show that different interfacial behaviors can be observed in different type of polyelectrolyte/surfactant systems. PSS/cationic surfactant CTAB systems show the classical behavior of oppositely charged polyelectrolyte/surfactant systems and can be well explained by electrostatic interaction. Molecular weight of PSS plays a crucial role in the nature of adsorption film. The complex formed by CTAB and higher molecular weight PSS, which has larger dimension and stronger interaction, results in higher dilational modulus at lower surfactant bulk concentration. In the case of PSS/anionic surfactant SDS systems, the co-adsorption of PSS at interface through hydrophobic interaction with alkyl chain of SDS leads to the increase of interfacial tension and the decrease of dilational modulus at lower surfactant bulk concentration. For PSS/nonionic surfactant T Â 100 systems, PSS may form a sublayer contiguous to the aqueous phase, which has little effect on interfacial tension but slightly decreases dilational modulus.

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Perturbation–response relationship in liquid interfacial systems: non-linearity assessment by frequency–domain analysis

Cited by 57 publications

References 8 publications

Dynamic surface elasticity of polyelectrolyte/surfactant adsorption films at the air/water interface: Dodecyltrimethylammonium bromide and copolymer of sodium 2-acrylamido-2-methyl-1-propansulfonate with N-isopropylacrylamide

Dynamic surface elasticity of polyelectrolyte/surfactant adsorption films at the air/water interface: Dodecyltrimethylammonium bromide and copolymer of sodium 2-acrylamido-2-methyl-1-propansulfonate with N-isopropylacrylamide

Surface rheology of monolayers of phospholipids and cholesterol measured with axisymmetric drop shape analysis

Effect of Molecular Weight on the Interfacial Dilational Viscoelasticity of Anionic Polyelectrolyte/Surfactant Systems

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