Surface dilatational rheological study of the trans–cis isomerisation of copolymers with trifluoromethoxy substituted metacrylate monolayers

Wüstneck, R.; Prescher, Dietrich; Katholy, S.; Knochenhauer, Gerald; Brehmer, L.

doi:10.1016/s0927-7757(00)00464-7

Cited by 20 publications

(12 citation statements)

References 27 publications

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“…Interfacial tension relaxation experiment is a reliable method to obtain interface dilational parameters . After the equilibrium IFT is reached, the surface layer is rapidly disturbed by a sudden expansion of the axisymmetric drop area.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…Interfacial tension relaxation experiment is a reliable method to obtain interface dilational parameters. 48 After the equilibrium IFT is reached, the surface layer is rapidly disturbed by a sudden expansion of the axisymmetric drop area. In this work the adsorption layer is expanded about 10% in area which will cause an interfacial tension jump and then IFT decays to the equilibrium again.…”

Section: Dilational Rheological Experimentmentioning

confidence: 99%

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Roles of Catanionic Surfactant Mixtures on the Stability of Foams in the Presence of Oil

et al. 2016

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The stability of foams in the presence of oil is a crucial factor for foam displacement process in enhanced oil recovery. After the test of foam stability in the presence of oil of the mixtures of sodium dodecyl sulfate (SDS) and dodecyltrimethylammonium bromide (C12TAB), “catanionic” surfactant mixtures are proposed as a novel agent to enhance the oil resistance of foam. Based on the investigations of the foam evolution and the interfacial properties, the mechanisms are demonstrated by means of approaches of multiple light scattering and interfacial dilational rheological experiments. Because of the electrostatic attraction between molecules with opposite charges, catanionic mixtures are highly close-packed and form dense adsorption layers, which possess high modulus. So when oil–aqueous and gas–aqueous interfaces are approaching each other, strong pseudoemulsion films are formed. The compact adsorption layers also inhibit the diffusion exchange between the interface and the bulk, and this is the key factor to decrease the interaction between the gas–aqueous and oil–aqueous interfaces of the pseudoemulsion film. These properties increase the enter barrier of the oil droplets to the film surface.

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Section: Experimental Methodsmentioning

confidence: 99%

Section: Dilational Rheological Experimentmentioning

confidence: 99%

Roles of Catanionic Surfactant Mixtures on the Stability of Foams in the Presence of Oil

et al. 2016

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“…Further details are given elsewhere. 2 The monolayers were spread at the surface of a pendant drop. The surface tension of the drop was determined by ADSA (axisymmetric drop shape analysis) and the pendant drop method was used as a microfilm balance, 6 where the monolayer was compressed stepwise by drop volume reduction (further details see ref 2).…”

Section: Methodsmentioning

confidence: 99%

“…2 The trans-cis photoisomerization in such monolayers may be performed by light irradiation with a xenon source. The trans conformers are preferentially formed in the case of monolayer irradiation at 450 nm; the cis conformers are formed at 360 nm.…”

Section: Introductionmentioning

confidence: 99%

Characterization and Modeling of Cis−Trans Photoisomerization of a Trifluoromethoxy-Substituted Metacrylate Copolymer Monolayer at a Fluid Interface

1999

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Spread monolayers of a photochromic trifluoromethoxy-substituted metacrylate copolymer were characterized by Π/A isotherms under the condition of mainly trans or cis conformation of the photochromic side chains and during the trans restoration process. The isotherms of the individual components, i.e., trans and cis conformation, respectively, and those of variable trans/cis content were described by a new theoretical approach, which takes into account a possible side chain aggregation. A good agreement between the experimental Π/A isotherms and the model was achieved for small aggregation numbers and a limited range of surface coverage. The trans/cis content during the trans recovery process was calculated by using the parameters of the individual components. The model correctly reflects the main characteristics of the individual components and the cistrans transformation process: the minimum area demand per repeating unit of the trans conformation is smaller than that of the cis conformer; the aggregate tendency is higher for the trans conformers at low surface coverage; the trans/cis ratio increases during the trans restoration, where the content depends on the surface pressure.

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“…Interfacial tension relaxation experiments are a reliable way to obtain surface dilational parameters [33]. This technique uses small but fast axisymmetric drop area expansion or compression to slightly disturb the monolayer equilibrium.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

Interfacial dilational properties of tri-substituted alkyl benzene sulfonates at air/water and decane/water interfaces

Zhang

Wang

Gong

et al. 2008

Journal of Colloid and Interface Science

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Surface dilatational rheological study of the trans–cis isomerisation of copolymers with trifluoromethoxy substituted metacrylate monolayers

Cited by 20 publications

References 27 publications

Roles of Catanionic Surfactant Mixtures on the Stability of Foams in the Presence of Oil

Roles of Catanionic Surfactant Mixtures on the Stability of Foams in the Presence of Oil

Characterization and Modeling of Cis−Trans Photoisomerization of a Trifluoromethoxy-Substituted Metacrylate Copolymer Monolayer at a Fluid Interface

Interfacial dilational properties of tri-substituted alkyl benzene sulfonates at air/water and decane/water interfaces

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