Measurements of interfacial shear viscoelasticity with an oscillatory torsional viscometer

Biconical Bob Oscillatory Interfacial Rheometer

“…The analysis involves, implicitly, the interfacial velocity profile which can be calculated using an iterative numerical scheme (5,6). The input to the model is the amplitude and phase lag of the bob with respect to the dish for a given frequency, from which Ј and Љ can be determined.…”

“…The deep channel rheometer was further developed for dynamic studies of viscoelastic and nonlinear gas-liquid interfaces (7,8,11) and liquid-liquid interfaces (10,12) by applying an oscillatory shear on the interface and measuring its response. Similarly, the biconical bob interfacial viscometer (2,3,5) has been extended further to measure viscoelastic interfacial properties of gas-liquid interfaces (4,6). In the present investigation, the complex interfacial rheological behavior of liquid-liquid interfaces was studied using an oscillatory biconical bob interfacial rheometer constructed in our laboratory.…”

“…Analytical solutions for the stationary state velocity field in terms of the amplitude ratio s and the phase lag are given in the literature (5,6). The interfacial viscoelastic parameters Ј and Љ can be calculated by measurement of s and of the bob with respect to the dish.…”

Methods of measuring rheological properties of interfacial layers (Experimental methods of 2D rheology)

“…Further development of this technique is related to the application of modern tools for producing a controlled torque or rate of rotation with a corresponding high-precision measurement of stress [15,[52][53][54][55][56][57]. The description of the design of such modern rotational instruments is beyond the scope of this review.…”

A study of shear viscosity of interfacial films containing alkyl metal phosphates

“…Meanwhile, interfacial viscosity depends on the arrangement and the interacting forces of the substances that form interfacial films [17]. Lee et al have reported on the stress-deformation behavior of a non-Newtonian surface subjected to an oscillatory shearing flow [18]. In this paper, we report on the influence of alkyl metal phosphates (length > 50 m), Shengli resin fraction and NaCl on the shear viscosity of the jet kerosene-water interface, as well as on the stability of the emulsion.…”