ABSTRACT
Porous materials are referred to those containing pores, cavities, channels, and interstices. According to the pore size d, porous systems are generally classied using the standard specied by International Union of Pure and Applied Chemistry (IUPAC): microporous (d < 2 nm), mesoporous (d ~ 2-50 nm), and macroporous (d > 50 nm) [1]. In recent years, there has been a rapid growth in the research of porous materials owing to their exceptional physical properties, with potential applications as adsorbents, catalysts, and catalyst supports. Combined with the advantages brought
4.1 Introduction .................................................................................................. 179 4.2 Fundamental Mechanical Properties of Porous Thin Films ........................ 181
4.2.1 Highly Ordered Porous Thin Films .................................................. 181 4.2.1.1 Porous Anodic Alumina Thin Film ................................... 182 4.2.1.2 TiO2 Nanotube Array Thin Film ....................................... 183 4.2.1.3 Silica Foam Thin Film ....................................................... 186
4.2.2 Disordered Porous Thin Films ......................................................... 188 4.3 Fracture Behavior of Disordered Porous Thin Films ................................... 190
4.3.1 Fracture Toughness and Interfacial Toughness ................................ 190 4.3.2 Failure and Toughening Mechanisms ...............................................202
