By Ravi Kumar Pujala

This thesis explores the dispersion balance, microstructure and section transitions all for the nanoclay system. It describes the lately came across formation of colloidal gels through routes: the 1st is thru part separation and moment is through equilibrium gelation and comprises the 1st said experimental remark of a approach with excessive point ratio nanodiscs. The section habit of anisotropic nanodiscs of alternative point ratio of their person and combined states in aqueous and hydrophobic media is investigated. distinctive part separation, equilibrium fluid and equilibrium gel phases are saw in nanoclay dispersions with wide aging. The paintings then explores answer habit, gelation kinetics, getting older dynamics and temperature-induced ordering within the person and combined states of those discotic colloids. Anisotropic ordering dynamics prompted through a water-air interface, ready time and temperature in those dispersions have been studied in nice aspect in addition to aggregation habit of nanoplatelets in hydrophobic surroundings of alcohol options.

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**Extra resources for Dispersion Stability, Microstructure and Phase Transition of Anisotropic Nanodiscs (Springer Theses)**

**Example text**

The periphery of geometry was coated with light silicon oil and enclosed by a wet sponge to minimize the solvent evaporation. Keeping the angular frequency fixed G’ as a function of change in temperature of the peltier plate was recorded. The profile of G’ versus temperature gives information about the thermal transition occurring in the material. 3 Viscometry Viscosity measurements of nanoclay dispersions were performed on the Sine-wave Vibro (SV-10) Viscometer. 6. It drives with an ac frequency (30 Hz) by vibrating at constant sine-wave vibration in reverse phase like tuning fork.

G. via the electrophoretic mobility of the particles in an electric field. Alternatively the particle charge can be quantified in surface charge per surface unit, determined by colloid titration. It can be defined as the measure of overall charge, a particle acquires in a specific medium. In this thesis, the charge is characterized by the zeta potential. The zeta potential theory is described in very detail by Müller in [11]. The development of a net charge at the particle surface affects the distribution of ions in the surrounding interfacial region, resulting in an increased concentration of counter ions (ions of opposite charge to that of the particle) close to the surface.

It is also concerned with establishing predictions for mechanical behavior (on the continuum mechanical scale) based on the micro or nanostructures of the materials. Rheology unites the seemingly unrelated fields of plasticity and non-Newtonian fluids by recognizing that both these types of materials are unable to support a shear stress in static equilibrium. In this sense, a plastic solid is a fluid. One of the tasks of rheology is to empirically establish the relationship between deformation and stress and their derivatives by adequate measurements.