Textbook in PDF format This book offers an in-depth exploration of the fundamentals of multi-layer composite (MLC) membranes for the gas separation applications. It provides a comprehensive overview of MLC membranes, including their historical development, structural features, fabrication techniques, selection criteria, mathematical models for gas transport, gas separation mechanisms, characterization methods, detailed adsorption mechanisms, current challenges, and future trends in gas separation technology. Serving as a valuable reference, this book is designed for materials scientists, environmental engineers, and chemical engineers seeking fundamental insights into the effective utilization of MLC membranes for energy-efficient gas separation processes. Introduction Synthesis Methods and Characterization Techniques of Multi-layer Composite (MLC) Membranes Adsorption in Multi-layer Composite (MLC) Membranes for Gas Separation Applications Multi-layer Composite (MLC) Membranes Gas Transport Models and Separation Mechanisms Conclusions and Future Trends