Thin‐Film Ceramic Membranes

Abstract

Ceramic membranes have undergone a concerted research development in the past two decades, since their initial development for uranium isotope processing for the nuclear industry in 1940s. The diversity of inorganic materials, such as ceramics, metals, and nonpolymeric carbons, has allowed researchers to build membranes by a number of processes ranging from simple sol‐gel dip coating to chemical vapor deposition and complex plasma coatings among many others. This article specifically covers all the major preparation methods currently employed in the preparation of thin‐film ceramic membranes derived from silica, zeolites, titania, hierarchical structures, and perovkites.

Fabrication and Performance Evaluation of Industrial Alumina Based Graded Ceramic Substrate for CO2 Selective Amino Silicate Membrane

“…Additionally, the intermediate layer as a transition region also plays a pivotal role not only in bridging the pore size difference between the macroporous substrate and final membrane layer but also in providing a great assistance toward evolving a homogeneous, defect-free separation layer with less mass transfer resistance. , However, the design of a flawless homogeneous intermediate layer keenly relies on the sustainable evolution of a graded structure with the progressive deposition of appropriate particle size, which efficiently forms strong “bridges” without encountering any sign of capillary infiltration . Herein, particularly in the cases of α-alumina support, γ-alumina is considered as a potential candidate for the intermediate transition region due to its strong chemical and physical compatibility with α-alumina membrane support and silica top-layer/selective layer systems.…”

“…31,32 However, the design of a flawless homogeneous intermediate layer keenly relies on the sustainable evolution of a graded structure with the progressive deposition of appropriate particle size, which efficiently forms strong "bridges" without encountering any sign of capillary infiltration. 33 Herein, particularly in the cases of α-alumina support, γ-alumina is considered as a potential candidate for the intermediate transition region due to its strong chemical and physical compatibility with α-alumina membrane support and silica top-layer/selective layer systems. Furthermore, the larger pore size of macroporous supports was found difficult to tune only with the γ-alumina layer due to limited control on coating parameters, which would not allow the direct formation of a thin defect-free amorphous silica/amino-silicate selective layer under normal atmospheric conditions.…”

Organic Membranes for Selectivity Enhancement of Metal Oxide Gas Sensors

“…Therefore, the membranes are simply too expensive for applications in gas sensor technology. Therefore inorganic membranes are not described here in detail, instead we refer to overviews of gas-selective inorganic membranes given in [36,37].…”