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

Autor Ravi Kumar Pujala
en Limba Engleză Hardback – 26 iun 2014
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.
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Specificații

ISBN-13: 9783319045542
ISBN-10: 3319045547
Pagini: 172
Ilustrații: XVI, 154 p. 95 illus., 26 illus. in color.
Dimensiuni: 155 x 235 x 15 mm
Greutate: 0.42 kg
Ediția:2014
Editura: Springer International Publishing
Colecția Springer
Seria Springer Theses

Locul publicării:Cham, Switzerland

Public țintă

Research

Cuprins

Introduction.- Materials and characterization techniques.- Phase diagram of Laponite dispersions.- Anisotropic ordering in nanoclay dispersions induced by water-air Interface.- Phase diagram of aging Montmorillonite dispersions.- Sol state and gelation kinetics in mixed nanoclay dispersions .- Aging dynamics in mixed nanoclay dispersions.- Thermal ordering in mixed nanoclay dispersions.- Aggregation and scaling behavior of nanoclays in alcohol solutions.- Summary.

Textul de pe ultima copertă

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.

Caracteristici

Nominated as an outstanding Ph.D. thesis by Jawaharlal Nehru University, New Delhi, India A comprehensive exploration of the physical phenomena in nano clay systems Looks at the equilibrium gels, isotropic-anisotropic transition, aging phenomenon First study of the behavior of mixed nano clay dispersions Includes supplementary material: sn.pub/extras