Perumal Pugazhendhi – författare

Molten Salts: Applications, Challenges, and Future Prospects in Energy Systems provides a comprehensive exploration of one of the most important classes of high-temperature functional materials used in modern science and engineering. Combining fundamental principles with practical engineering applications, this book presents a clear and interdisciplinary treatment of molten salt technologies and their rapidly expanding role in sustainable energy systems.The book begins with the chemistry, classification, thermodynamic behavior, and physicochemical properties of molten salts before examining transport phenomena, heat transfer, electrochemistry, corrosion mechanisms, materials compatibility, and purification techniques. These foundational concepts are then connected to real-world engineering applications, enabling readers to understand how molten salts function in demanding industrial environments.A major focus of the book is the application of molten salts in thermal energy storage, concentrated solar power, advanced nuclear reactors, molten salt reactors, hydrogen production, industrial electrochemistry, high-temperature batteries, metallurgy, and chemical manufacturing. Each topic is supported by discussions of engineering design, operational principles, performance characteristics, safety considerations, and current technological developments. The book also examines economic challenges, commercialization pathways, environmental sustainability, and regulatory issues that influence the large-scale deployment of molten salt technologies.Recognizing the rapid evolution of the field, the book explores emerging innovations including artificial intelligence, machine learning, digital twins, autonomous monitoring, predictive maintenance, advanced computational modeling, and intelligent process optimization. These technologies are transforming the design, operation, and reliability of future molten salt systems while supporting the transition toward carbon-neutral energy infrastructure.Designed for graduate students, researchers, faculty members, practicing engineers, and industry professionals, this volume combines scientific rigor with practical insight. Numerous illustrations, engineering examples, review questions, references, and future research perspectives make it suitable as both a graduate-level textbook and a professional reference.By integrating chemistry, materials science, thermal engineering, electrochemistry, and energy systems into a unified framework, this book demonstrates how molten salts are becoming enabling materials for next-generation technologies. It offers readers a thorough understanding of both the scientific foundations and the engineering challenges of molten salt systems while highlighting their critical role in the future of sustainable energy, advanced manufacturing, and intelligent industrial infrastructure.

PrefaceIonic liquids have emerged as one of the most important classes of materials in modern chemistry and materials science. Unlike conventional molecular solvents, ionic liquids consist entirely of ions and often remain liquid near room temperature. Their negligible vapor pressure, excellent thermal and electrochemical stability, broad liquid temperature range, high solvating ability, and highly tunable physicochemical properties have made them enabling materials for sustainable technologies, advanced manufacturing, energy storage, catalysis, separations, biotechnology, and environmental engineering. During the past three decades, ionic liquids have evolved from laboratory curiosities into versatile functional materials with growing academic and industrial significance.This book provides a comprehensive, interdisciplinary, and practical introduction to ionic liquid science and technology. It bridges the gap between fundamental chemistry and modern applications by integrating theoretical principles with current research and engineering practice. The text is intended for graduate students, researchers, educators, and professionals in chemistry, chemical engineering, materials science, electrochemistry, nanotechnology, biotechnology, pharmaceutical sciences, and related fields.The book begins with the history, molecular structures, synthesis methods, nomenclature, classification, and physicochemical properties of ionic liquids. Subsequent chapters discuss thermodynamics, transport properties, spectroscopy, computational modeling, toxicity, environmental considerations, and safety. Particular emphasis is placed on understanding how cation–anion combinations and molecular design influence viscosity, conductivity, thermal stability, electrochemical behavior, and application-specific performance, providing a foundation for the rational design of task-specific ionic liquids.A major focus of this volume is the expanding role of ionic liquids in emerging technologies. Applications covered include catalysis, organic synthesis, biomass processing, carbon capture, gas separations, batteries, supercapacitors, fuel cells, hydrogen technologies, lubricants, heat-transfer fluids, pharmaceuticals, drug delivery, biotechnology, analytical chemistry, nanomaterials, and advanced manufacturing. Recent developments involving deep eutectic solvents, bio-based ionic liquids, artificial intelligence, machine learning, and computational materials discovery are also introduced to illustrate future directions in the field.Throughout the book, complex concepts are explained using clear discussions supported by carefully prepared figures, tables, practical examples, and engineering perspectives. Recent scientific literature has been incorporated wherever appropriate to provide readers with an up-to-date understanding of both established knowledge and rapidly evolving research areas. Although every effort has been made to ensure scientific accuracy, ionic liquid research continues to advance rapidly, and readers are encouraged to consult current literature for the latest developments.The remarkable versatility of ionic liquids demonstrates how advances in molecular design can transform multiple scientific disciplines while supporting cleaner manufacturing, sustainable energy systems, and environmentally responsible chemical processes. It is my sincere hope that this book will serve as a valuable resource for education, research, and industrial innovation, while inspiring future scientists and engineers to explore the exciting opportunities that ionic liquids offer for solving important scientific and technological challenges.

PrefaceEvery piece of metal has a history. The copper in a mobile phone, the iron in a bridge, the nickel in a battery, and the gold in a wedding ring may seem to be ordinary materials taken from the Earth. Yet their atoms were not created here. They formed long before our planet existed, inside stars and during some of the most powerful events in the universe.This book follows that remarkable journey—from the early universe and the birth and death of stars to the formation of the Solar System; from the young Earth's core, mantle, and crust to the processes that concentrated scattered atoms into ore deposits; and from mines and refineries to the technologies on which modern life depends.Nuclear physics explains how atomic nuclei form. Astronomy reveals where the elements were created. Chemistry explains their behavior. Geology shows how the Earth separated and concentrated them, and engineering turns them into useful materials. These are not separate subjects here, but chapters in one continuous story.Creating a metal atom is not the same as making it available. When the young Earth was partly molten, many dense, metal-loving elements moved toward its core. Others remained dispersed through the mantle and crust. Magma, hot water, weathering, and erosion concentrated a small portion into mineral deposits. A deposit becomes an ore only when it can be extracted under practical, economic, environmental, legal, and social conditions.Modern civilization depends deeply on metals. Steel supports buildings and transport. Copper carries electricity. Other metals strengthen alloys, store energy, resist corrosion, and enable catalysts. Batteries, medical devices, communication systems, renewable-energy technologies, and aircraft all rely on carefully selected elements.Mining supplies essential materials, but it can disturb land, consume water and energy, generate waste, and affect communities. Responsible use requires better mining, durable products, efficient design, transparent supply chains, and improved recycling. Recycling is essential, but it cannot immediately replace primary production.No advanced scientific background is required. Technical ideas are explained in plain language, numerical values are treated with caution, and uncertainties are acknowledged. The journey of a representative metal atom is illustrative: its exact history cannot be reconstructed, but every stage described is grounded in established science.A metal is not merely a substance; it is the result of a sequence. Its nucleus had to be created, its atoms had to reach the forming Earth, geology had to concentrate them, and people had to discover, extract, refine, and shape them. Their cosmic history is ancient, but our responsibility for how we use them is immediate.Every metal atom has travelled farther than we can easily imagine. This book is an invitation to follow that journey—from stardust to ore, and from ore into the human world.Perumal Pugazhendhi, Ph.D.2026

PrefaceThe discovery of nanodiamond has transformed our understanding of carbon-based materials and opened exciting opportunities across science, engineering, medicine, and advanced manufacturing. Once regarded primarily as an industrial abrasive because of diamond's exceptional hardness, nanodiamond has evolved into one of the most versatile nanomaterials of the twenty-first century. With particle sizes typically ranging from a few to several hundred nanometers, nanodiamonds combine the extraordinary mechanical, thermal, optical, and chemical properties of diamond with the unique advantages of nanoscale materials. Their remarkable biocompatibility, large surface area, tunable surface chemistry, and ability to integrate with polymers, metals, ceramics, and biological systems have positioned them as enabling materials for next-generation technologies.Today, nanodiamonds are being investigated for applications in drug delivery, bioimaging, quantum sensing, biomedical engineering, electronics, energy storage, tribology, catalysis, coatings, composites, thermal management, environmental remediation, and quantum computing. Their nitrogen-vacancy (NV) centers have attracted worldwide attention for quantum information science, while surface-functionalized nanodiamonds continue to advance targeted therapeutics, regenerative medicine, and precision diagnostics. As research expands, nanodiamonds are increasingly becoming essential components of interdisciplinary scientific innovation.This book has been written to provide a comprehensive, interdisciplinary, and practical treatment of nanodiamond materials and hybrid systems. It bridges the gap between introductory texts and specialized research literature by integrating fundamental principles with recent scientific advances and emerging applications. The material is intended for graduate students, researchers, faculty members, scientists, engineers, and professionals working in materials science, nanotechnology, chemistry, chemical engineering, physics, biomedical engineering, mechanical engineering, energy technologies, and related disciplines.The chapters begin with the fundamental structure, synthesis, characterization, surface chemistry, defects, and interfaces of nanodiamonds before progressing to their mechanical, thermal, electrical, optical, and biological properties. The book then explores hybrid nanodiamond systems, composite materials, biomedical technologies, energy applications, quantum technologies, advanced manufacturing, environmental applications, artificial intelligence–assisted materials discovery, sustainability, commercialization, and future research directions. Throughout the text, emphasis is placed on connecting scientific theory with engineering practice and industrial applications.Special attention has been given to presenting complex concepts in a clear and systematic manner. Numerous figures, tables, workflows, case studies, and practical examples are included to help readers understand both the scientific foundations and technological significance of nanodiamond materials. Recent advances from academic research and industrial development have been incorporated wherever appropriate, providing readers with an up-to-date perspective on this rapidly evolving field.Nanodiamond research continues to expand at an extraordinary pace, driven by advances in nanotechnology, biotechnology, quantum engineering, and sustainable materials science. Future innovations will likely emerge from collaborations across multiple disciplines, making interdisciplinary education increasingly important. It is my hope that this book will serve as a valuable resource for learning, teaching, research, and innovation, while inspiring the next generation of scientists and engineers to explore the immense potential of nanodiamond materials.

Fuel cells occupy a peculiar place in the modern energy conversation. They are simultaneously the oldest electrochemical power technology—older than the internal combustion engine—and one of the most futuristic. Sir William Grove built the first in 1839; more than a century later, alkaline cells flew to the Moon, and phosphoric acid cells became the first fuel cells to earn a living on the ground, quietly powering hospitals, data centers, and campuses through grid outages that combustion generators could not ride through.This book is about that workhorse: the phosphoric acid fuel cell, or PAFC. It is not the highest-efficiency cell, nor the smallest, nor the cheapest. What it offers instead is a combination that has proven commercially durable: tolerance to impure, reformed hydrogen; an operating temperature high enough to deliver genuinely useful heat; and a service life measured in decades. In an era of decarbonization and distributed power, those qualities are being rediscovered.Why a new edition, and why nowThe technology has not stood still, and neither should a textbook about it. The years leading to 2026 brought maturation of high-temperature polybenzimidazole membranes that blur the old line between PAFC and PEMFC, the arrival of machine-learning diagnostics that can hear a stack failing before a human can, and a hydrogen economy that has begun putting real steel in the ground—only to discover, through the project cancellations of 2025 and 2026, how unforgiving the economics of clean fuel remain. That reckoning, examined in Chapter 23, has if anything strengthened the case for the fuel-flexible stationary technologies this book describes. Meanwhile the costs, capacities, and comparisons that students need have all shifted. This edition updates the numbers, adds the new physics, and—most importantly—rebuilds the material as a course rather than a monograph.Who this book is forThe intended reader is an upper-level undergraduate or beginning graduate student in chemical, mechanical, materials, electrical, or energy engineering, or a working professional entering the field. The prerequisites are modest: general chemistry, introductory thermodynamics, and enough calculus to be unafraid of a differential equation. Everything else—electrochemistry, transport phenomena, kinetics, reliability, techno-economics—is developed from the ground up, with worked examples at every turn.A word of thanksNo book of this scope is a solitary act. I am grateful to the students whose questions exposed every place the earlier text was unclear, to the engineers who corrected my instincts with field data, and to the reader now holding this edition, who will find the remaining errors. They are mine.May your cells stay wet, your platinum stay dispersed, and your voltage stay high.

History is rarely a story of sudden beginnings or abrupt endings. Civilizations emerge over centuries, shaped by geography, climate, technology, trade, and the movement of people and ideas. One of the most intriguing questions in South Asian archaeology is whether the Indus (Harappan) Civilization and the later Tamil civilization represented by Keezhadi share a historical relationship. This book explores that question through the lens of modern science rather than speculation.The Indus Civilization, one of the world's earliest urban societies, flourished between about 2600 and 1900 BCE with remarkable achievements in city planning, engineering, craft production, and international trade. More than a thousand years later, the excavations at Keezhadi revealed an advanced urban settlement in the Vaigai Valley, providing strong archaeological evidence for an early literate Tamil society. The discoveries at Keezhadi have transformed our understanding of ancient South India and inspired renewed interest in its place within the broader history of the subcontinent.This book examines whether these two civilizations are connected through direct continuity, cultural exchange, shared ancestry, or independent development. To answer this question responsibly, it draws upon published research in archaeology, radiocarbon dating, ancient DNA, linguistics, environmental science, and comparative history. Every chapter distinguishes clearly between established evidence, reasonable interpretation, and questions that remain unresolved.The purpose of this work is neither to promote political narratives nor to defend cultural assumptions. Instead, it seeks to demonstrate how scientific investigation allows us to reconstruct the past with increasing clarity while acknowledging the limits of current knowledge. Where the evidence is strong, conclusions are presented confidently; where uncertainties remain, they are stated honestly.Written in accessible language for students, educators, researchers, and general readers, this book combines clear explanations with illustrations, maps, tables, and comparative analyses to make complex archaeological evidence understandable. It encourages readers to evaluate evidence critically and appreciate how new discoveries continue to reshape our understanding of South Asia's ancient civilizations.The relationship between Harappa and Keezhadi is not simply a question about two archaeological sites; it is a window into the long and complex story of human civilization. As future excavations, genetic studies, and the possible decipherment of the Indus script expand our knowledge, our understanding will continue to evolve. Until then, this book offers an evidence-based journey through one of archaeology's most fascinating and important questions.

A note for students, general readers, and the merely curious - start here.You do not need a background in chemistry or engineering to read this book. If you have ever charged a phone, driven or ridden in an electric car, worried about a dying laptop, or wondered how a whole city might one day run on sunshine stored for the night, you already have every reason you need. This book was written to take that everyday curiosity and turn it into real understanding - the kind you can carry into a classroom, a boardroom, a workshop, or a dinner-table argument.Batteries sit at a strange and wonderful intersection. They are chemistry and physics, but also economics, geopolitics, design, and daily life. A single lithium-ion cell contains a century of scientific insight, a global supply chain spanning five continents, and a set of trade-offs so delicate that shifting one of them by a few percent can reshape entire industries. Understanding batteries means understanding a little of all of it, and that is exactly what makes them such a rewarding subject.Who this book is forThis book is written to work on three levels at once, and you should feel free to read it at whichever level suits you today:·   The young adult or newcomer can follow the main narrative straight through and come away genuinely fluent - able to explain how a battery works, why electric cars use the chemistries they do, and what the arguments about the future are really about.·   The college student will find the vocabulary, the governing equations in plain language, the material-by-material detail, and the comparative tables that turn a casual interest into exam-ready and lab-ready knowledge.·   The general adult reader can dip in and out, follow the boxes and figures, and still assemble a clear, current, and honest picture of one of the defining technologies of the twenty-first century.

Energy is at the heart of modern life. From the electricity that powers our homes to the fuels that drive industries and transportation, the way we produce and use energy shapes our world. As global demand for cleaner, more efficient, and sustainable energy systems continues to grow, new technologies are emerging to meet these challenges. Among them, Solid Oxide Fuel Cells (SOFCs) stand out as one of the most promising solutions.This book was written to provide a clear, structured, and accessible understanding of SOFC technology—how it works, why it matters, and where it is headed. While the science behind SOFCs involves complex electrochemical processes and advanced materials, the goal of this book is to present these concepts in a way that is both comprehensive and easy to understand, making it suitable for students, researchers, engineers, and anyone interested in clean energy technologies.Throughout the chapters, we explore the fundamentals of SOFC operation, including ion transport, electrochemical reactions, and system design. We then move into practical aspects such as materials, thermal management, durability, and real-world deployment challenges. Comparative discussions with other fuel cell technologies provide a broader perspective, helping readers understand where SOFCs fit within the larger energy landscape.Real-world case studies highlight how SOFCs are already being used in hospitals, residential systems, industrial plants, and even advanced applications such as space exploration. These examples demonstrate that SOFCs are not just theoretical devices but are actively contributing to cleaner and more efficient energy systems today.Looking ahead, the book emphasizes emerging trends such as low-temperature SOFCs, reversible operation (SOFC/SOEC), hydrogen production, and integration with renewable energy systems. These developments position SOFCs as a key technology in the transition toward a hydrogen-based and sustainable energy economy.This book is also meant to inspire curiosity. Energy technology is not just about engineering—it is about solving real-world problems, reducing environmental impact, and building a better future. Whether you are a student learning the basics, a professional exploring advanced concepts, or simply someone interested in clean energy, this book aims to provide both knowledge and motivation.Finally, this work reflects the collective efforts of scientists, engineers, educators, and innovators around the world who continue to advance fuel cell technology. Their contributions remind us that progress comes from collaboration, persistence, and a shared vision for a cleaner planet.As you read through these pages, I encourage you to think about how technologies like SOFCs can shape the future of energy—and how each of us can play a role in that transformation.