Physical and chemical principles of nanotechnology present the subject with the aim of providing information about Quantum Mechanics, Basics of Thermodynamics, Lattice Vibrations and Band Theory of Solids, Semiconductors and Tunneling & Colloidal Systems. This work is primarily intended to be a textbook for bachelor degree students in engineering, science and technology. This book has crucial role to play in the curriculum of all branches of engineering and technology.
Quantum mechanics is a physical science dealing with the behaviour of matter and energy on the scale of atoms and subatomic particles/waves. It also forms the basis for the contemporary understanding of how huge objects such as stars and galaxies, and cosmological events such as the Big Bang, can be analyzed and explained. Quantum mechanics is the foundation of several related disciplines including nanotechnology, condensed matter physics, quantum chemistry, structural biology, particle physics, and electronics. The term "quantum mechanics" was first coined by Max Born in 1924.
The acceptance by the general physics community of quantum mechanics is due to its accurate prediction of the physical behaviour of systems, including systems where Newtonian mechanics fails. Even general relativity is limited in ways quantum mechanics is not for describing systems at the atomic scale or smaller, at very low or very high energies, or the lowest temperatures.
Through a century of experimentation and applied science, the quantum mechanical theory has proven to be very successful and practical. The foundations of quantum mechanics date from the early 1800s, but the real beginnings of QM date from the work of Max Planck in 1900. Albert Einstein and Niels Bohr soon made essential contributions to what is now called the "old quantum theory."
Table of Contents
CHAPTER 1: QUANTUM MECHANICS
1.1 Introduction
1.2 Planck's Hypothesis
1.3 Origin of Quantum Theory
1.3.1 Atomic & Subatomic Particles
1.4 Classical V/S Quantum Mechanics
1.5 Dual Nature of Matter By De Broglie
1.5.1 Matter Waves: De-Broglie Concept
1.5.2 Wavelength of De-Broglie Waves
1.6 Uncertainty Principle
1.7 Localization and the Wave Function
1.8 Complementarity
1.9 Valence Bond Theory
1.9.1 Postulates of Valence Bond Theory
1.9.2 Limitations of Valence Bond Theory
1.9.3 Applications
1.10 Introduction to Molecular Orbital Theory
1.10.1 Molecular Orbitals
1.11 Computational Chemistry
CHAPTER 2: BASICS OF THERMODYNAMICS
2.1 Introduction
2.2 Importance and Limitations Of Thermodynamics
2.3 Thermodynamic Terms Definition and Examples for System and Surroundings
2.3.1 Properties of A System
2.3.2 State Variables
2.3.3 Thermodynamic Process
2.3.4 Thermodynamic Equilibrium
2.3.5 Internal Energy
2.3.6 Enthalpy
2.3.7 Heat Capacity
2.4 Zeroth Law of Thermodynamics
2.5 First Law of Thermodynamics
2.5.1 Mathematical Expression of First Law of Thermodynamics
2.5.2 Relation Between Cp (Constant Pressure) and Cv (Constant Volume):
2.5.3 Spontaneous Process
2.5.3.1 Criteria of Spontaneity
2.6 Second Law of Thermodynamics
2.7 Third Law of Thermodynamics
CHAPTER 3: LATTICE VIBRATIONS & BAND THEORY OF SOLIDS
3.1 Introduction
3.2 Lattice Vibrations
3.3: Heat Capacities of Solids
3.4 Einstein’s Theory of Heat Capacities
3.5 Debye’s Theory of Heat Capacities
3.6 Energy Band Theory in Solids
3.6.1 Important Energy Bands in Solids
3.7 Motion of Electron in Band Theory
3.8 Motion of Electron in Periodic Field Of Crystal
3.9 Kronig-Penny Model
3.10 Brillion Zones
3.11 Difference Between Conductors, Semiconductors, and Insulators on The Basis of Energy Bands
3.11.1 Conductors
3.11.2 Semiconductors
3.11.3 Insulator
3.12 Difference B\W Conductor Semiconductor & Insulator
CHAPTER 4: SEMICONDUCTORS AND TUNNELING
4.1 Semiconductors
4.1.1 Intrinsic Semiconductors
4.1.2 Extrinsic Semiconductors
4.1.3 Doping of Semiconductors
4.1.4 N-Type Semiconductor
4.1.5 P-Type Semiconductor
4.1.6 P-N Junction Semiconductor
4.2 Tunneling
4.3 Classical Vs Quantum Tunneling
4.4 Tunneling Diode
4.4.1 Symbol of Tunnel Diode
4.4.2 Electric Current in Tunnel Diode
4.4.3 Tunnel Diode Working
4.4.4 Advantages of Tunnel Diodes
4.4.5 Disadvantages of Tunnel Diodes
4.4.6 Applications of Tunnel Diodes
4.5 Tunnel Junction
4.6 Resonant-Tunneling Diode
4.6.1 Operation
CHAPTER 5: COLLOIDAL SYSTEMS
5.1 Introduction
5.1.1 True Solutions
5.1.2 Suspensions
5.2 Crystalloids
5.3 Colloids
5.3.1 Difference Between Colloids & Crystalloids
5.4 Classification of Colloids
5.4.1 Based on the Nature of Interaction Between Dispersed Phase and Dispersion Medium
5.4.2 Based on Type of Particles of Dispersed Phase
5.4.3 Classification Based on The Affinity of Two Phases
5.4.3.1 Lyophilic Sols
5.4.3.2 Lyophobic Sols
5.5 Characteristics of Colloidal Solutions
5.5.1 Dynamic Properties
5.5.2 Electrical Properties
5.5.3 Optical Properties
5.6 Emulsion
5.6.1 Introduction
5.6.2 Classification
5.6.3 Differences Between W/O & O/W
5.7 Characteristics of Emulsions
5.8 Identification of Type Of Emulsion
Objectives and Research Themes
This textbook aims to provide a fundamental understanding of physical and chemical principles underlying nanotechnology, covering core concepts from quantum mechanics to colloidal systems. The work focuses on explaining the behaviour of matter at atomic and subatomic scales, thermodynamic processes, the physics of solids, semiconductor devices, and the characteristics of colloids and emulsions to bridge the gap between theoretical physics and practical engineering applications.
- Quantum mechanics foundations and the wave-particle duality of matter.
- Thermodynamic laws, entropy, and energy transformation processes in systems.
- Band theory of solids, lattice vibrations, and electron dynamics in periodic fields.
- Semiconductor physics, including doping mechanisms, p-n junctions, and quantum tunneling diodes.
- Colloidal chemistry, covering classification, properties of emulsions, and surface phenomena.
Excerpt from the Book
4.4: TUNNELLING DIODE
A Tunnel diode is a heavily doped p-n junction diode in which the electric current decreases as the voltage increases.
In tunnel diode, electric current is caused by “Tunnelling”. The tunnel diode is used as a high-speed switching device in computers. It is also used in high-frequency oscillators and amplifiers.
Summary of Chapters
CHAPTER 1: QUANTUM MECHANICS: This chapter introduces the foundations of quantum mechanics, including Planck's hypothesis, wave-particle duality, and the principles governing atomic and molecular orbital structures.
CHAPTER 2: BASICS OF THERMODYNAMICS: This chapter covers fundamental thermodynamic laws, state variables, heat capacity, and the transition of energy in chemical and physical processes.
CHAPTER 3: LATTICE VIBRATIONS & BAND THEORY OF SOLIDS: This chapter explores the thermal properties of solids, crystal lattice dynamics, and the energy band structures that differentiate conductors, semiconductors, and insulators.
CHAPTER 4: SEMICONDUCTORS AND TUNNELING: This chapter details semiconductor physics, doping techniques, p-n junctions, and the phenomenon of quantum tunneling applied in tunnel diodes and resonant-tunneling devices.
CHAPTER 5: COLLOIDAL SYSTEMS: This chapter discusses the classification, dynamic, electrical, and optical properties of colloids, as well as the characteristics and identification of various emulsion types.
Keywords
Quantum Mechanics, Thermodynamics, Lattice Vibrations, Band Theory, Semiconductors, Tunneling Diode, Resonant-Tunneling Diode, Colloidal Systems, Emulsion, Entropy, Enthalpy, Electrons, Nanotechnology, Doping, Quantum Physics.
Frequently Asked Questions
What is the core focus of this book?
The book focuses on the physical and chemical principles that serve as the foundation for nanotechnology, examining matter at both macroscopic and microscopic scales.
What are the primary thematic fields covered?
The main themes include quantum mechanics, thermodynamics, the physics of solids and semiconductors, quantum tunneling phenomena, and colloidal systems.
What is the primary objective of this work?
The primary goal is to provide a comprehensive educational resource that explains complex physical phenomena, such as energy transitions and electronic behaviour, in a way that is applicable to modern technological and scientific research.
Which scientific methods are primarily utilized?
The book employs theoretical physics, mathematical modelling of energy systems, and experimental observation of material properties to explain concepts like the Schrodinger equation, band theory, and colloidal dynamics.
What topics are discussed in the main body?
The main body treats quantum foundations, thermodynamic laws and state functions, lattice dynamics, band structures of materials, semiconductor manufacturing techniques like doping, and the classification and properties of colloids and emulsions.
Which keywords characterize this work?
Key terms include Quantum Mechanics, Thermodynamics, Semiconductors, Tunneling, Colloids, Energy Bands, and Nanotechnology.
How does the tunnel diode differ from a conventional p-n junction?
Unlike a conventional p-n junction, a tunnel diode is heavily doped and operates based on quantum mechanical tunneling, exhibiting a negative resistance region that allows for high-speed switching and high-frequency oscillation.
Why are colloids important in nanotechnology?
Colloids are essential because their large surface-to-volume ratio and specific dynamic, electrical, and optical properties make them critical for understanding surface phenomena and developing various nanostructured materials.
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- Naveen Kumar J R (Autor), Dr. P. Prasad (Autor), 2019, Physical and chemical principles of nanotechnology, Múnich, GRIN Verlag, https://www.grin.com/document/461772
