Chemistry Reference
In-Depth Information
Fig. 2.21
Typical monomers with reactive -C
≡
CH group for the synthesis of amorphous POFs
For example, infrared spectroscopy is carried out to detect the success and com-
pletion of reaction indicated by the change in the characteristic band. Elemental
analysis is powerful to analyze the composition of POFs. In addition, XPS is
intensive to detect the elements except for H. Therefore, XPS could be utilized
to confirm the ending groups of POFs and the residual of catalysis. Solid-state
1
H and
13
C nuclear magnetic resonance (NMR) spectroscopy is performed to
investigate the local structure of POFs. The macroscopic morphology of POFs is
studied through field emission scanning electron microscopy for evaluating the
size and morphology. High-resolution transmission electron microscopy could
investigate their porous texture. To study the 3D structure, Cooper and cowork-
ers have developed an atomistic simulation method [
53
]. The method utilizes
fragmental models and amorphous cell simulation embedded in the Materials
Studio Modeling package to build the molecular models. Nitrogen adsorp-
tion and desorption isotherms are useful to provide information concerning the
porosity of POPs, including some important parameters such as surface area,
total pore volume, microporous pore volume, mesoporous pore volume, and pore
size distribution.
2.5 Concerns in the Development of POFs
POFs as an important subclass of nanoporous materials are of great interest in
materials science. In recent years, the discovery of POFs for advanced applications
has attracted extensive attention and intensive efforts. In fact, POF materials have
contributed to various fields, potentially for use in the areas of gas storage, molecular
separations, sensors, catalysts [
54
,
55
], etc. As a result, the design of materials with
multifunctionalities is an ever-pursued dream of materials scientists and engineers.
In the development of POF materials, some important issues are of great interest.
