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Über dieses Buch

Kinetic studies have traditionally being extremely useful in characterizing several physical and chemical phenomena in organic, inorganic and metallic systems. It provides valuable qualitative, quantitative and kinetic information on phase transformations, solid state precipitation, crystallization, oxidation and decomposition. Unfortunately, no single reference comprehensively presents nonisothermal kinetic analysis method for the study of complex processes, determining the actual mechanism and kinetic parameters. This book provides a new method for nonisothermal kinetics and its application in heterogeneous solid state processes. In the backdrop of limitations in existing methods, the book presents a brief review of the widely used isothermal and nonisothermal kinetic analysis methods.

Inhaltsverzeichnis

Frontmatter

Chapter 1. Fundamental Concepts of Kinetics

Abstract
The solid state reaction kinetics has been extensively studied time and again in the past century. The parameters involving in the kinetics of solid state processes are often misconstrued as intrinsic constants that characterize a particular solid state reaction. But this is a delusion as solid state processes involve rigorous and complex kinetics. The study of the kinetics in the solid state explicates the mechanism of the process as well as the related kinetic parameters.
Pritam Deb

Chapter 2. Material Development and Process

Abstract
Recently, there has been a significant increase in interest in fabricating oxide materials that consist of nanosized particles ranging in mean diameter from 1 to 100 nm.
Pritam Deb

Chapter 3. Non-isothermal Kinetic Analysis Method

Abstract
Solid state kinetics lays its foundation on the basis of the experiments that are carried out in absolute isothermal conditions. However, although it is known that thermally activated processes involve gradual heating up of the reactants and the reactions progress under rising and fluctuating temperature conditions, conventional kinetic studies were confined to only isothermal conditions due to limitation of performing. In addition, the mathematical procedures developed for analysing non-isothermal kinetic data contain numerous approximations, assumptions and controversies [15]. These procedures fail to reflect the characteristics of a realistic situation. In addition to this, a priori knowledge of the reaction mechanism is required. The reaction mechanism is either assumed or identified by carrying out isothermal kinetic experiments. The methods [69] most widely used to evaluate activation energy from the non-isothermal calorimetric data are also based on a particular type of assumed mechanism. Nonetheless, characteristic reaction mechanism(s) do exist for all the reactions occurring under non-isothermal conditions. Therefore, the development of a more reliable and accurate non-isothermal kinetic analysis method is long overdue. In the present study, it has been shown that the actual reaction mechanism under non-isothermal conditions can be directly identified unambiguously through a newly developed technique.
Pritam Deb

Chapter 4. Kinetics of a Solid State Process

Abstract
The kinetic study of a solid state process extends several significant information about the process. A critical study of the kinetics gives a better understanding of the process as well as also helps in predetermining the equilibrium state. Therefore, in this chapter I have tried to analyze the kinetic data on the evolution of iron oxide nanoparticles to yield a better insight on the reaction mechanism and process parameters. Moreover, the study will help one to design and control the process parameters more accurately and effectively.
Pritam Deb

Chapter 5. Kinetics of the Heterogeneous Solid State Process

Abstract
Heterogeneous solid state processes do not involve the physical parameters that characterize the state of reaction system homogeneously during the reaction. A close examination of the DSC plots (refer Fig. 4.​1) of the samples at different heating rate reveals the asymmetric nature, which implies the occurrence of intermediate reactions during the process. Here, it is felt that identification of these intermediate reactions and the kinetic laws, which remain operative, will help one to cast a deeper insight into the evolution of iron oxide nanoparticles from the organic precursor.
Pritam Deb

Chapter 6. Summary

Abstract
The present non-isothermal kinetic analysis method successfully identifies the mechanism of the solid state process. The activation energy can be calculated more accurately from the kinetic data. The apriori knowledge of the reaction mechanism is not at all required. Hence the kinetic laws are ascertained directly from the non-isothermal kinetic data. Even kinetic law(s) at any temperature that fall within the experimental range can be ascertained.
Pritam Deb

Backmatter

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