Dispersion Stability, Microstructure and Phase Transition of Anisotropic Nanodiscs (Springer Theses)

Ravi Kumar Kumar Pujala

ISBN 10: 3319381954 / ISBN 13: 9783319381954

Editore: Springer 2016-09-17, 2016

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Dati bibliografici

• Titolo: Dispersion Stability, Microstructure and Phase Transition of Anisotropic Nanodiscs (Springer Theses)
• Editore: Springer 2016-09-17
• Data di pubblicazione: 2016
• Lingua: Inglese
• ISBN 10: 3319381954
• ISBN 13: 9783319381954
• Rilegatura: Paperback
• Condizione: New

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Riassunto

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.