Dispersion Stability, Microstructure and Phase Transition of by Ravi Kumar Pujala

By Ravi Kumar Pujala

This thesis explores the dispersion balance, microstructure and section transitions curious about the nanoclay process. It describes the lately found formation of colloidal gels through routes: the 1st is thru part separation and moment is by means of equilibrium gelation and contains the 1st said experimental remark of a approach with excessive point ratio nanodiscs. The section habit of anisotropic nanodiscs of other point ratio of their person and combined states in aqueous and hydrophobic media is investigated. special section separation, equilibrium fluid and equilibrium gel levels are saw in nanoclay dispersions with broad getting older. The paintings then explores resolution habit, gelation kinetics, getting older dynamics and temperature-induced ordering within the person and combined states of those discotic colloids. Anisotropic ordering dynamics caused through a water-air interface, ready time and temperature in those dispersions have been studied in nice element besides aggregation habit of nanoplatelets in hydrophobic setting of alcohol solutions.

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Extra resources for Dispersion Stability, Microstructure and Phase Transition of Anisotropic Nanodiscs

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It is interesting to note that light scattering data does not distinguish between a sol and a gel state. 63 (6 months sample) with the aging. 3 Results and Discussion 43 phase (glassy state). 4a).

2) After initially shearing the material at a stress above the yield stress, the stress can be decreased in a slow ramp and the point where motion stops is the apparent yield point. Again as indicated previously, this value may be affected by the decreasing ramp rate and the time-dependent ability of the material to rebuild structure. (3) A creep experiment can be used where stress is applied to the material and strain (displacement) is monitored with time to establish an equilibrium yield stress.

The in-phase vibration of OH stretching mode generates the peak at 3,200 cm−1. This signifies the structurally arranged water, also referred to as ice like structures. The fraction at 3,310 cm−1 originates from the partial- structured water. The peak around 3,460 cm−1 arises from amorphous water or bulk water (poorly H-bonded water molecules). The three Raman components whose central frequencies correspond to about 3,200, 3,310, and 3,460 cm−1 collectively summed together, as described above, were used to define the hydrogen bonding configuration in the dispersion.

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