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9781574447682

Kinetics, Transport, and Structure in Hard and Soft Materials

by ;
  • ISBN13:

    9781574447682

  • ISBN10:

    1574447688

  • Format: Hardcover
  • Copyright: 2005-04-20
  • Publisher: CRC Press

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Summary

Emphasizing the interdisciplinary nature of transport in materials, Kinetics, Transport, and Structure in Hard and Soft Materials discusses the connection between the mechanisms of transport of atomic or molecular entities that occur in a diverse range of materials and how these transport processes are connected to a wide range of innovative materials applications across several industries. It presents its material in a user-friendly format for readers from any discipline with a foundation in elementary differential equations and thermodynamics or physical chemistry. Topics include diffusional transport, mechanisms of transport in crystalline/structurally disordered materials, and various types of instabilities leading to morphological evolution.

Table of Contents

Part I Tools: Elements of Diffusional Transport
1(76)
Elements of Transport in Systems of Noninteracting Particles and the Phenomenology of Diffusion
Introduction
3(2)
Transport of Noninteracting Particles
5(15)
Average Thermodynamic Properties
5(5)
Maxwell-Boltzmann Velocity Distributions
10(1)
Distribution of Component Velocities
11(3)
Distribution of Speeds
14(1)
Diffusional Transport of Noninteracting Particles
15(1)
Flux of Maxwellian Particles
16(1)
The Diffusion Coefficient and Fick's 1st Law
17(1)
Collision Probabilities and the Mean Free Path
18(2)
The Diffusion Equations: Fick's Laws
20(5)
Fick's 1st Law: Additional Comments
20(2)
Fick's 1st Law in Cylindrical Coordinates
22(1)
Fick's 1st Law in Spherical Coordinates
22(1)
Fick's 2nd Law
22(2)
Fick's 2nd Law in Cylindrical Coordinates
24(1)
Fick's 2nd Law in Spherical Coordinates
25(1)
Simple Problems Involving Steady State Flow
25(3)
Flow through a Planar Layer
25(1)
Steady State Flow through Nonplanar Surfaces: Cylinder
26(1)
Steady State Flow through a Spherical Interface
27(1)
Diffusion of Particles from a Point Source in One-Dimension
28(8)
Solution to Fick's 2nd Law Using Fourier Integral Transforms
28(3)
Solution to Fick's 2nd Law in Three Dimensions Using Laplace Transforms
31(5)
Concentration Profile Due to a Spatially Extended Initial Source, f(x')
36(5)
Diffusion from a Semi-Infinite Source
36(1)
Diffusion from a Finite Source of Thickness 2h
37(1)
Desporption/Absorption of a Species from a Sample of Finite Dimensions
38(1)
Permeation Experiments
39(1)
Time-Dependent Fluxes: Weight Gain Experiments
40(1)
Concluding Remarks
41(1)
Problems
42(6)
References
48(1)
Appendices
48(3)
Integrals
48(1)
Fourier Integral Transforms of Derivatives
48(3)
Brownian Motion
Introduction
51(1)
The Random Walk Problem
52(4)
Binomial Distribution Function
52(2)
One-Dimensional Random Walk: Diffusion
54(1)
The Gaussian Distribution Function
54(2)
Poisson Distribution Function
56(1)
Correlation Functions
56(7)
Pair Correlation Functions and the Static Structure Factor
59(1)
Single Particle Density Distribution Function
60(1)
Pair Distribution Function
60(3)
Langevin Analysis
63(4)
Velocity Autocorrelation Function
64(1)
Mean Square Velocity
64(1)
Mean Square Displacement
65(1)
Stokes-Einstein Equation
66(1)
Nernst-Einstein Equation
66(1)
Light Scattering: Measurement of Diffusion
67(5)
The Scattered Field
68(1)
Scattering from a Dilute Collection of Molecules
69(1)
Measurement of Diffusion
70(2)
Problems for Chapter 2
72(3)
Appendix: The Diffusion Coefficient
75(1)
References
75(2)
Part II Diffusion in Crystalline Materials
77(72)
Structure, Defects and Atomic Diffusion in Crystalline Metals
Introduction
79(2)
Crystal Structure and Point Defects
81(8)
Bravais Lattices
81(1)
Unit Cells, Crystal Directions, and Crystal Planes
82(4)
Atomic Defects in Crystals
86(3)
Tracer and Self-Diffusion in Crystals
89(6)
Random Walk in 3-D
89(2)
The Jump Frequency, Γ
91(2)
Debye Frequency
93(1)
An Expression for the Tracer Diffusion Coefficient
94(1)
Atomic Transport in Crystals via a Single Vacancy Mechanism
95(3)
Self-Diffusion and Tracer Diffusion via a Vacancy Mechanism
96(2)
The Equilibrium Vacancy Concentration
98(5)
Vacancy Concentration in Crystals: Experiment versus Theory
99(4)
Divacancies and Their Effect on Diffusion
103(3)
Diffusion of Interstitials in Crystals
106(1)
Ring Mechanism of Atomic Diffusion
107(1)
The Interstitialcy Mechanism of Atomic Diffusion
108(1)
Diffusion in the Presence of Impurities
108(6)
``Kick-Out'' and Dissociative Mechanisms
109(1)
Diffusion of Vacancy-Substitutional Impurity Pairs
109(1)
Concentration of Vacancies and Impurities in a Dilute Alloy
109(2)
Substitutional Impurity-Vacancy Pair Diffusion
111(3)
Isotope Effects
114(1)
Effects of Pressure on Diffusion
114(1)
Diffusion Near Dislocations and Grain Boundaries
115(2)
Final Remarks
117(1)
Problems for Chapter 3
117(4)
References and Additional Reading
121(2)
Diffusion in Ionic Crystals: Alkali Halides
Introduction
123(1)
Defects in Ionic Crystals
124(1)
Frenkel Defect Concentration
125(1)
Schottky Defect Concentration
126(1)
Diffusional Transport of Cationic and Ionic Defects
127(2)
Diffusivity of Frenkel Defects
129(1)
Diffusion of Schottky Defects
130(1)
The Effect of Multivalent Impurities on Conductivity
131(2)
Comments on Transport in Alkali Halide Crystals: Transport Coefficients
133(2)
Problems for Chapter 4
135(2)
References and Additional Reading
137(2)
Diffusion in Semiconductors
Introduction
139(1)
Structure and Point Defects in Silicon
140(1)
Self-Diffusion in Silicon and Germanium
140(3)
Diffusion of Dopants
143(3)
Mechanisms of Atomic Transport
144(1)
Examples
145(1)
Concluding Remarks
146(1)
Problems for Chapter 5
147(1)
References
147(2)
Part III Diffusional Transport in Systems That Lack Long-Range Structural Order
149(116)
Transport and Viscoelasticity of Large Macromolecules
Introduction and Context
151(2)
Classification of Polymers
153(2)
Properties of a Single Polymer Chain
155(7)
Freely Jointed Chain Model
155(1)
Freely Rotating Chain Model
156(2)
Hindered Rotation Chain Model
158(1)
Persistence Length
159(1)
Single Chain Statistics: Excluded Volume Effects
160(2)
Single Chain Statistics Continued: Gaussian Statistics
162(1)
Phenomenology of the Viscoelastic Behavior of Polymers
162(17)
Maxwell and Voigt Phenomenological Models
164(4)
The Viscosity: Experimental Observations
168(1)
Temperature Dependence of the Viscosity
169(2)
Time-Temperature-Superposition and Shift Factors
171(2)
Oscillatory Shear Measurements
173(2)
Connections between G (t) and Frequency Domain Experiments
175(4)
Microscopic Model for Diffusion and Viscoelasticity in Polymer Melts
179(24)
Rouse Model: Unentangled Chains
180(2)
Reptation: Dynamics of Entangled Chains
182(5)
The Stress Relaxation Modulus, the Viscosity, and the Steady State Compliance
187(3)
Summary of Chain Segmental Dynamics
190(1)
The Entanglement, the Molecular Weight, and the Critical Molecular Weight
190(2)
The Viscosity of Polymers
192(1)
The Diffusion Coefficient of Entangled Chains
193(3)
Temperature Dependence of Diffusion
196(2)
Tube Length Fluctuations
198(1)
Constraint Release Mechanism
199(3)
Dynamic Moduli G'(ω) and G''(ω)
202(1)
Concluding Remarks
203(1)
Problems for Chapter 6
204(4)
References
208(3)
Transport Processes in Inorganic Network Glasses
Introduction
211(2)
The Structure of Inorganic Network Glass Formers: An Introduction
213(3)
Bulk Transport Processes Inorganic Network Glass Formers
216(6)
Temperature Dependence of the Viscosity: The VTF Equation
217(1)
Comments Regarding the Glass Transition
218(2)
Temperature Dependence of the Viscosity: Adam-Gibbs Model
220(2)
Connection between Kinetic and Thermodynamic Fragility
222(1)
``Strong'' versus ``Fragile'' Network Glass Melts, a Structural Connection
223(5)
Influence of Alkali Content on Heat Capacity and Activation Energy for Flow
224(2)
The Viscosity of Mixed Alkali Glass Melts
226(1)
Effect of Alkali Composition on Tg
227(1)
The Energy ``Landscape'' Approach
228(1)
Relaxation Functions
228(2)
Mechanical Relaxations
230(5)
Primary Relaxations
230(2)
Secondary Mechanical Relaxations (T < Tg)
232(3)
Phenomenology of Secondary Relaxations: Ionic Conductivity
235(1)
Ionic Conductivity and Diffusion
235(6)
Case I
237(1)
Case II
237(1)
Comments Regarding Ionic Conductivity in Network Glasses
237(3)
The Electrical Modulus Representation
240(1)
Secondary Relaxations in ECR and MR Experiments
241(2)
Mechanism of Cation Transport in Ionic Glasses
243(3)
Single Alkali Glasses
243(1)
Option I
243(1)
Option II
244(1)
Mixed Alkali Glasses
245(1)
Final Remarks
246(1)
Problems for Chapter 7
246(3)
References
249(3)
Appendix
252(3)
Comments on Heterogeneous Dynamics in the Disordered State
Introduction
255(1)
Temperature Dependencies of Relaxations
256(4)
Dispersive Dynamics Associated with Disorder
257(3)
Comments on Dynamics in the Supercooled State
260(1)
Comments on the Stokes-Einstein Relationship
261(1)
Final Comments
262(1)
References
262(3)
Part IV Instabilities and Pattern Formation in Materials
265(84)
Phase Separation in Binary Mixtures: Spinodal Decomposition and Nucleation
Introduction
267(2)
Free Energy of Mixing of a Binary Polymer-Polymer Mixture
269(4)
Phase Diagram of a Simple Binary Mixture
271(2)
Spinodal Decomposition
273(5)
Linearized Theory for the Early Stages of Spinodal Decomposition
273(5)
Structure Factor
278(1)
An Example Involving a Polymer-Polymer Mixture
278(2)
Remarks Regarding Spinodal Decomposition
280(1)
Nucleation
281(5)
Nucleation in the A/B Mixture
282(1)
Elements of the Classical Theory of Nucleation
282(2)
Steady State Growth Rate
284(2)
Heterogeneous Nucleation
286(1)
Concluding Remarks on Nucleation and Growth
287(1)
Problems for Chapter 9
287(2)
References for Spinodal Decomposition
289(1)
References for Nucleation and Growth
290(3)
Interdiffusion: Diffusion in Chemical Potential Gradients
Introduction
293(3)
Transport in Diffusion Couples
296(5)
Onsager Analysis
296(2)
The Darken Equation
298(2)
Marker Velocity
300(1)
The Hartley-Crank Equation
301(1)
Interdiffusion in Polymers
302(3)
Measurements of Interdiffusion
305(4)
Marker Experiments
306(3)
Concluding Remarks
309(1)
Problems for Chapter 10
309(1)
References
310(3)
Growth: Moving Interfaces and Instabilities in Bulk Materials
Introduction
313(2)
Effect of Curvature on the Properties of Small Particles
315(5)
Elementary Concepts of Classical Capillarity
315(3)
Effect of Curvature on the Properties of Small Systems
318(2)
Moving Front in a Supercooled Melt
320(8)
Stationary Solutions (planar interface, k= 0)
324(1)
Linear Stability Analysis
325(3)
Instabilities at an Interface in a Supersaturated Environment
328(2)
Brief Comments on Microstructure
330(1)
Problems for Chapter 11
331(3)
References and Further Reading
334(3)
Comments on Instabilities and Pattern Formation in Condensed Matter
Introduction
337(1)
Instabilities That Arise in Driven Liquid Films
338(2)
Instabilities in Macroscopically Thick Films
338(2)
Instabilities in Films of Nanoscale Thickness
340(3)
Pattern Formation in Nanometer-Thick Films
340(2)
Fingering in Ultrathin Films
342(1)
Instabilities Involving Macroscopic or Bulk Flows
343(3)
Rayleigh-Benard Instability
344(1)
Rayleigh Instability
345(1)
Final Comments
346(1)
References
346(1)
Further Reading
347(2)
Index 349

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