Shear induced structure formation at the air-water interface of aqueous, synthetic polymer solutions

doi:10.1016/0021-9797(73)90268-3

Journal of Colloid and Interface Science

Volume 45, Issue 2, November 1973, Pages 280-288

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Abstract

The occurrence of anomalous viscosity behavior of dilute polymer solutions, indicated by increases in shear stress with time at constant shear rate, have been investigated in a cone and plate viscometer. The ionic strengths of the solutions influence the kinetics of increases whereas the presence of small amounts of detergent abolishes the effect. The results are interpreted by assuming the shear induced development of a structural network of the polymer solute at the air-water interface.

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Rheological and rheo-SALS investigation of the multi-lamellar vesicle formation in the C <inf>12</inf>E <inf>3</inf>/D <inf>2</inf>O system
2012, Journal of Colloid and Interface Science
Citation Excerpt :
Shear-induced structure is a relevant topic of research, and it has received a great deal of attention [1–27].
Usually in nonionic surfactant aqueous systems of the C_nE_m type, a lamellar phase occurs over a wide temperature and concentration range. For some C_nE_m surfactants, multi-lamellar vesicle (MLV) formation has been observed when the lamellar phase is subjected to shear flow.
This communication reports the shear flow behavior at different shear rate values of a C_nE_m (where “n” is 12 and “m” is 3) aqueous system at 34 °C. The typical transient viscosity behavior of the shear-induced MLV formation in C₁₂E₃/D₂O at 50 wt% of surfactant has been observed. The MLV formation is confirmed by time-resolved rheo-small angle light scattering (SALS) experiments. The experimental data show an intermediate structure that has been attributed to a multi-lamellar cylinders (MLCs).
Multi-lamellar vesicle formation in a long-chain nonionic surfactant: C <inf>16</inf>E <inf>4</inf>/D <inf>2</inf>O system
2011, Journal of Colloid and Interface Science
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Shear-induced structures and structural changes in complex fluids are interesting and important topics in colloidal sciences [1–10].
The temperature dependent rheological and structural behavior of a long-chain C₁₆E₄ (tetraethylene glycol monohexadecyl ether) surfactant in D₂O has been studied within the regime of low shear range. In the absence of shear flow, the system forms a lamellar liquid crystalline phase at relatively high temperatures. The present paper reports on the shear-induced multi-lamellar vesicle (MLV) formation in C₁₆E₄/D₂O at 40 wt.% of surfactant in the temperature range of 40–55 °C. The transition from planar lamellar structure to multi-lamellar vesicles has been investigated by time-resolved experiments combining rheology and nuclear magnetic resonance (rheo-NMR), rheo small-angle neutron scattering (rheo-SANS) and rheometry. The typical transient viscosity behavior of MLV formation has been discovered at low shear rate value of 0.5 s⁻¹.
Shear-induced protein-protein interaction at the air-water interface
1974, BBA - Biomembranes
Increases in the viscosity of solutions of different proteins varying over a wide range of molecular shape and size have been studied in a cone and plate viscometer. The protein concentrations used were lower than those needed to produce viscosities of the solutions significantly greater than the solvent medium. The high values of shear stress finally reached are attributed to a shear-induced formation of an intermolecular structure resulting from protein-protein interactions at the air water interface.
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Shear-induced viscosity change of aqueous polymethacrylic acid solution
2000, Polymer Journal

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Shear induced structure formation at the air-water interface of aqueous, synthetic polymer solutions

Abstract

J. Colloid Sci.

J. Colloid Sci.

J. Colloid Interface Sci.

Advan. Protein Chem.

J. Colloid Sci.

J. Colloid Interface Sci.

J. Colloid Interface Sci.

Recent Progr. Surface Sci.

J. Colloid Sci.

J. Colloid Interface Sci.

Biochim. Biophys. Acta

J. Colloid Interface Sci.

J. Colloid Sci.

Advan. Protein Chem.