1. Introduction 2. Smectite Clays 3. Microstructure of Natural Smectite Clay 4. Microstructure of Artificial Clay-Based Engineered Barriers 5. Clay Properties and Microstructural Constitution 6. Microstructural Function of Smectite Clay in Waste Isolation 7. Long-term Function of Smectite Clay for Waste Isolation 8. Theoretical Modelling of the Performance of Smectite Clay Microstructure
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