Preparation and Characterization of Model Catalysts for the HCl Oxidation Reaction - Atomically-Precise Methods for Synthesis of Solid Catalysts - page 209

for electrospinning are the solubility of the desired material (or its pre-
cursor(s)) and a suciently high viscosity of the solution to be electrospun
(typically in the range of 0.1-2 Pa s). 104,105 The first electrospun materials
were polymers due to the fact that already moderate polymer concentrations
give solutions of high viscosity (Figure 8.5a). The electrospinning process
itself and the underlying physical processes were studied quite extensively
on simple polymer solutions. For a general introduction to the electrospin-
ning technique the reader is referred to the literature. 106-109
Anisotropic oxidic nanostructures such as nanotubes, nanorods, or
nanofibers are very promising for diverse applications including model

d n 9 r 4 n g | 8

.

Figure 8.5 Synthetic concepts for the preparation of electrospun fibers: a.) and b.):

''conventional'' synthetic concepts; c.) and d.): ''new'' synthetic concepts.
a.) preparation of polymeric fibers; b.) preparation of inorganic
fibers via the sol-gel route (with or without the addition of organic
polymers); c.) preparation of inorganic fibers via the nanoparticle ap-
proach; d.) preparation of inorganic fibers via the 'bricks and mortar'
approach.