© 2014

Dispersion Stability, Microstructure and Phase Transition of Anisotropic Nanodiscs


Part of the Springer Theses book series (Springer Theses)

Table of contents

  1. Front Matter
    Pages i-xvi
  2. Ravi Kumar Pujala
    Pages 1-16
  3. Ravi Kumar Pujala
    Pages 17-36
  4. Ravi Kumar Pujala
    Pages 37-51
  5. Ravi Kumar Pujala
    Pages 103-117
  6. Ravi Kumar Pujala
    Pages 119-129
  7. Ravi Kumar Pujala
    Pages 141-145
  8. Back Matter
    Pages 147-154

About this book


This thesis explores the dispersion stability, microstructure and phase transitions involved in the nanoclay system. It describes the recently discovered formation of colloidal gels via two routes: the first is through phase separation and second is by equilibrium gelation and includes the first reported experimental observation of a system with high aspect ratio nanodiscs. The phase behavior of anisotropic nanodiscs of different aspect ratio in their individual and mixed states in aqueous and hydrophobic media is investigated. Distinct phase separation, equilibrium fluid and equilibrium gel phases are observed in nanoclay dispersions with extensive aging. The work then explores solution behavior, gelation kinetics, aging dynamics and temperature-induced ordering in the individual and mixed states of these discotic colloids. Anisotropic ordering dynamics induced by a water-air interface, waiting time and temperature in these dispersions were studied in great detail along with aggregation behavior of nanoplatelets in hydrophobic environment of alcohol solutions.


Aging Dynamics in Anisotropic Colloidal Dispersions Anitropic Ordering of Anisotropic Colloids Equilibrium Gels Ergodic to Nonergodic Transition Gels Formed Through Phase Sepration Isotropic-anisotropic Phase Transition Mixed Nanoclay Gels and Glasses Nanoclay Aggregation in Hydrophobic Media Nanoclay Dispersions Ordering Induced by Water-air interface

Authors and affiliations

  1. 1.School of Physical SciencesJawaharlal Nehru UniversityNew DelhiIndia

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