Stress relaxation behaviour of dipalmitoyl phosphatidylcholine monolayers spread on the surface of a pendant drop

Wüstneck, R.; Wüstneck, N.; Grigoriev, D. O.; Pison, U.; Miller, R.

doi:10.1016/s0927-7765(99)00094-6

Cited by 43 publications

(68 citation statements)

References 43 publications

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“…Linear regressions of our ε P values produced by harmonic oscillations are shown as solid lines. Up to Π ≤ 27 mN m −1 ε P values obtained by us with a = 1.5% are in very good concordance with those of Wüstneck et al [4], who performed monolayer stepwise compressions with a pendent drop tensiometer, as described in [50]. For Π > 27 mN m −1 , which limits the plateau of ε P , their curve increases with a smaller slope.…”

Section: Dependence Of η and ε On The Film Pressuresupporting

confidence: 77%

“…Consequences of surface rheology on respiratory performance have been discussed in detail [2][3][4][5]. Further, the surface rheology of phosAbbreviations: DPPC, dipalmitoylphosphatidylcholine; DPPG, dipalmitoylphosphatidylglycerol; DOPC, dioleoylphosphatidylcholine; ADSA, axisymmetric drop shape analysis; PAT, profile analysis tensiometer; THD, total harmonic distortion * Corresponding author.…”

Section: Introductionmentioning

confidence: 99%

“…Here, monolayer compression and expansion is more homogeneously distributed over the whole area than on a Langmuir trough. ADSA was used to study DPPC [4,21,30] and other phospholipid monolayers at the air-water interface [3,4,21,30,31], chloroform/water interface [21,22,30], n-dodecane/water interface [23,30] or dichloromethane/water interface [32]. Alternatively to a pendent drop, PAT can also be used to study a captive bubble under prescribed oscillations.…”

Section: Introductionmentioning

confidence: 99%

“…Isotherms are reported for DPPC [4,[11][12][13][14][15][16][17][18][19][20][21][22][23], DOPC [11,[24][25][26], binary DPPC/cholesterol [15,27], binary DOPC/cholesterol [25,26], and ternary DOPC/DPPC/cholesterol mixtures [28]. To obtain the surface dilational viscosity and the dynamic surface elasticity, monolayers on a Langmuir film balance are studied with an oscillating barrier at various frequencies, which is described for DPPC [16,19,20] and DOPC [24].…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Dependence Of η and ε On The Film Pressuresupporting

confidence: 77%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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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show abstract

“…Possibly, there might be an additional contribution of the dilational viscosity of the monolayer. 51,60,61 Combination of eqs 8 and 5 yields and after integration With s 0 . x(t), eq 10 reduces finally to From eq 11 it follows that the spreading front displacement is proportional to the energy per unit area W A gained by spreading, and inversely proportional to the friction coefficient and the length s 0 of the region in which dissipation occurs.…”

Section: Discussionmentioning

confidence: 99%

Spreading of Lipid Monolayers on Hydrophilic Substrates at Increased Relative Humidities

Baumgart

Offenhäusser

2002

Langmuir

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A self-repairing ability of phospholipid monolayers deposited onto thin hydrogel films was observed by fluorescence microscopy, in terms of the expansion and lateral spreading of the monolayer into film defects. The spreading was quantitatively analyzed by covering half of a substrate supporting a thin hydrogel film with a lipid monolayer by Langmuir-Blodgett transfer and observing the spreading of the initially confined monolayer at increased relative humidities due to the hydration of both lipid headgroups and the polymer support. During the observation time of a typical spreading experiment, a constant spreading velocity was observed. A strong influence of monolayer pressure on the spreading velocity was observed. A nonlinear relationship between spreading velocity and monolayer pressure was found, which can possibly be explained by a dependence of the disjoining pressure in the monolayer/substrate interface on the monolayer pressure. The spreading velocity was additionally influenced by the kind of support and by the nature (e.g., phase state) of the deposited monolayer.

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Recent Developments in Dilational Viscoelasticity of Surfactant Layers

Liggieri¹,

Ferrari²,

Ravera³

2006

Colloid Stability

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Stress relaxation behaviour of dipalmitoyl phosphatidylcholine monolayers spread on the surface of a pendant drop

Cited by 43 publications

References 43 publications

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

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

Spreading of Lipid Monolayers on Hydrophilic Substrates at Increased Relative Humidities

Recent Developments in Dilational Viscoelasticity of Surfactant Layers

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