We describe a new approach to understanding the progressive transition from linear to nonlinear rheological response in complex fluids and soft solids. Large amplitude oscillatory shear (LAOS) tests are carried out over a wide range of frequencies and strain amplitudes. The resulting material response to an oscillatory input can be represented in terms of Lissajous figures and can also be decom...

Nematic liquid crystals are textured, anisotropic, viscoelastic materials. The remarkable rheological properties of viscoelastic materials are governed by the flow-induced evolution of molecular configuration. Analogues to liquid crystal flow processes occur in the supramolecular selfassembly processes of living biological tissues. A good understanding of the relationships between rheological p...

The present study was aimed to develop topical gel of Curcumin which enhances the bioavailability & permeation with the help of combination of polymers which will be useful in further drug delivery. Polymers plays major role in various characterization parameters of topical gel such as in vitro release and rheological properties. A stable, elegant formulation of curcumin gel was successfully pr...

The nonlinear rheological response of soft glassy materials is addressed experimentally by focusing on concentrated emulsions where interdroplet attraction is tuned through varying the surfactant content. Velocity profiles are recorded using ultrasonic velocimetry simultaneously to global rheological data in the Couette geometry. Our data show that nonadhesive and adhesive emulsions have radica...

We investigate the system size-dependent rheological response of branched type I collagen gels. When subjected to a shear strain, the highly interconnected mesh dynamically reorients, resulting in overall stiffening of the network. When a continuous shear strain is applied to a collagen network, we observe that the local apparent modulus, in the strain-stiffening regime, is strongly dependent o...

In this paper, film thickness and pressure distribution of EHL in line contacts for four kinds of greases and one type of oil are calculated under a series of rolling velocities by wing an inverse solution method. The Herschel-Bulkley model is wed for the rheological characteristics of the grease. Based on the theoretical analysis and numerical calculation, the following influences on film thic...

Recently, optical tweezing has been used to provide a method for microrheology addressed to measure the rheological properties of small volumes of samples. In this work, we corroborate this emerging field of microrheology by using these optical methods for the characterization of polyelectrolyte solutions with very low viscoelasticity. The influence of polyelectrolyte (i.e., polyacrylamide, PAM...

The processing of a polyelectrolyte (whose functionality is derived from its ionized functional groups) into a nanofiber may improve its functionality and yield multiple functionalities. However, the electrospinning of nanofibers from polyelectrolytes is imperfect because polyelectrolytes differ considerably from neutral polymers in their rheological properties. In our study, we attempt to solv...

1. To build a comprehensive wave-ice interaction mathematical framework for a wide range of ice conditions observable in the Marginal Ice Zone (MIZ); 2. To identify a minimum set of rheological parameters that can reproduce all existing wave-ice interaction types; 3. To test the sensitivity of various parameters in the new wave-ice interaction model; 4. To relate physically detectable ice cover...

A new paradigm of rheological characterization, oscillatory simple shear with infinite forcing amplitudes, is introduced by Khair (J. Fluid Mech., vol. 791, 2016, R5). This pushes the technique of large-amplitude oscillatory shear (LAOS) to have two extremely large amplitudes (both strain-rate and strain), which we might call XXLAOS. Model-specific analytical predictions are derived for a suspe...