Surface Rheological Data for a Polymeric Surfactant Using a Pulsed Drop Rheometer

Kitching, S.; Johnson, G.; Midmore, B.R.; Herrington, Thelma M.

doi:10.1006/jcis.1996.0006

Cited by 28 publications

(25 citation statements)

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“…Considering present limitations on oscillation frequency, further experiments such as oscillatory maximum bubble pressure measurements may be necessary in order to understand the behavior completely. Cole−Cole plots using reduced viscoelastic moduli ( E ‘ / E 0 versus E ‘ ‘ / E 0 ) have been employed to differentiate between diffusional and reorientational mechanisms at the interface with the shape of the resultant plot indicative of the rate-determining process . A Cole−Cole plot was constructed for poly(fluorooxetane) 1 .…”

Section: Resultsmentioning

confidence: 99%

Interfacial Rheological Properties of a Series of Bolaamphiphilic Poly(fluorooxetane)s

Kausch¹,

Kim²,

Russell³

et al. 2003

Langmuir

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Interfacial rheological studies were performed on a series of bolaamphiphilic R,ω-(diammonium disulfato)-poly(fluorooxetane)s of several perfluoroalkyl chain lengths. Similar measurements were performed on a small-molecule, anionic fluorosurfactant with a -C8F17 perfluoroalkyl group that is known to be an effective flow and leveling aid in aqueous coatings. Dilational viscoelasticities were measured for the fluorosurfactants as a function of concentration and oscillation rate. Elasticities were found to increase with increasing perfluoroalkyl chain length. All elasticities exhibited a strain rate dependence indicative of the influence of diffusional relaxation on elasticity values. Phase angles were found to be in the range for diffusional relaxation and decreased with increasing concentration and strain rate. Using interfacial rheological data, characteristic fluid dynamics numbers were calculated for the fluorosurfactants. Among these was the Marangoni number. Calculated Marangoni numbers for the poly(fluorooxetane)s were of the same order of magnitude as that for the small-molecule, long perfluoroalkyl chain surfactant. The poly(fluorooxetane)s all have equilibrium surface tensions greater than that of the small-molecule, long perfluoroalkyl chain surfactant, yet show similar abilities to aid in flow and leveling in aqueous coatings at comparable concentrations. Rheological measurements demonstrate that equilibrium surface tension alone is not enough to explain the fluid dynamics processes occurring during flow and leveling.

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Section: Resultsmentioning

confidence: 99%

Interfacial Rheological Properties of a Series of Bolaamphiphilic Poly(fluorooxetane)s

Kausch¹,

Kim²,

Russell³

et al. 2003

Langmuir

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show abstract

“…For a single reorientation process at the interface, a plot of ε i /ε 0 versus ε r /ε 0 is a semicircle centered at (1/2, 0) of radius 1/2, whereas if the relaxation mechanism is diffusion controlled, the corresponding Cole−Cole plot describes an arc of a circle centered at (1/2, −1/2) of radius √2/2. Single reorientation and diffusion processes are therefore easily distinguished from each other. ,, …”

Section: Resultsmentioning

confidence: 58%

“…Single reorientation and diffusion processes are therefore easily distinguished from each other. 24,36,37 The Cole-Cole plots of the water-air and water-decane interfaces for C 8 E x C 8 are listed in Figures 8-10. It can be seen that the low-frequency process appears at the left-hand side of the horizontal axis, and the high-frequency process appears at the right-hand side from the Cole-Cole plot.…”

Section: Comparison Of Dilational Modulus For C 8 Ementioning

confidence: 99%

Dilational Properties of Anionic Gemini Surfactants with Polyoxyethylene Spacers at Water−Air and Water−Decane Interfaces

et al. 2010

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The dilational properties of anionic gemini surfactants (oligooxa)-alpha,omega-bis(m-octylbenzene sulfonate) (C(8)E(x)C(8)) with polyoxyethylene spacers at the water-air and water-decane interfaces were investigated via the oscillating barriers method. The influences of oscillating frequency and bulk concentration on dilational properties were explored. The interfacial tension relaxation method was employed to obtain dilational parameters in a reasonably broad frequency range. The experimental results show that the number of ethylene oxide groups is one of the principal factors to control the nature of the interfacial film. With an increase of ethylene oxide groups, the dilational modulus of C(8)E(8)C(8) shows two maxima with the increasing concentration. Furthermore, the dilational moduli at the water-decane interface are remarkably lower than those at the water-air interface for C(8)E(1)C(8) and C(8)E(4)C(8), while the dilational modulus at the water-decane interface is close to that at the water-air interface for C(8)E(8)C(8), which indicates that the structure of the adsorption sublayer plays a more important role. Possible schematic diagrams of adsorbed molecules with different polyoxyethylene spacers at the water-air and water-decane interfaces are proposed. The results of relaxation experiments and Cole-Cole plots can support our provided mechanism strongly.

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“…Single reorientation and diffusion processes are therefore easily distinguished from each other. [24,35,36] …”

Section: Cole-cole Plots Of C 8 E 3 Nc 12 and C 8 E 4 Nc 12mentioning

confidence: 98%

Dilational Viscoelasticity of the Zwitterionic Gemini Surfactants with Polyoxyethylene Spacers at the Interfaces

Feng

Liu

Zhang

et al. 2011

Journal of Dispersion Science and Technology

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The dilational viscoelasticity of zwitterionic gemini surfactants C 8 E x NC 12 with polyoxyethylene spacers at the water-air and water-decane interfaces were investigated by oscillating barriers method. The experiments were carried out at different concentrations with an accessible frequency range of 0.005 to 0.1 Hz. Interfacial tension relaxation method was employed to obtain dilational parameters in a reasonably broad frequency range. Experimental results show that the values of dilational elasticity and viscosity of C 8 E x NC 12 are larger than those of common nonionic surfactants, such as T Â 100, and the dilational viscoelasticity at the water-decane is close to that at the water-air interface on the whole . The results may be attributed to Coulombic attraction, and the possible schematic diagrams of adsorbed molecules with different polyoxyethylene spacers at the water-air and water-decane interfaces are proposed. We also analyzed C 8 E x NC 12 from the results of relaxation experiments and Cole-Cole plots.

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Surface Rheological Data for a Polymeric Surfactant Using a Pulsed Drop Rheometer

Cited by 28 publications

References 0 publications

Interfacial Rheological Properties of a Series of Bolaamphiphilic Poly(fluorooxetane)s

Interfacial Rheological Properties of a Series of Bolaamphiphilic Poly(fluorooxetane)s

Dilational Properties of Anionic Gemini Surfactants with Polyoxyethylene Spacers at Water−Air and Water−Decane Interfaces

Dilational Viscoelasticity of the Zwitterionic Gemini Surfactants with Polyoxyethylene Spacers at the Interfaces

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