Computer Simulation of Solids by C. R. A. Catlow, W. C. Mackrodt

By C. R. A. Catlow, W. C. Mackrodt

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17c and d). Formation of the ZnO hierarchical structures or two-step growth mode can only occur at a certain release rate of Zn2+ ions (here, using Zn foil as the zinc source and VDIW/VEDA = 3:37–1:7), which provides a kinetically favorable condition for ZnO hierarchical growth, similarly to the precursor-induced synthesis of hierarchical nanostructured ZnO [47–49]. 1, we can also obtain other micro/nanostructured materials, such as TiO2 and ZnS, using the corresponding precursors and structural directors.

5:1 or higher, full magnetite phase can be formed. 22b and c. A lower or higher molar ratio of Cit to Fe3+ in the precursor solution cannot lead to a high quality of fibers but a mixture of tangled nanowires and spherical magnetite particles [75]. It indicates that C6 H 5 O37− in the solution not only plays a dominant role in the formation of the magnetite phase but also exhibits an important effect on magnetite morphology. In summary, Fe3O4 porous fibers can be formed only under proper conditions, including moderate PR and Cit concentrations, appropriate pH value in the precursor solution, and a suitable reaction temperature.

1 Formation of Ultrafine Fe3O4 Nanoparticles When the concentration of Fe3O4 molecules was supersaturated, ultrafine Fe3O4 nanoparticles were formed in the solution by nucleation and growth. 24a. The corresponding zeta potential was measured to be −35 mV, which prevents further growth and aggregation of the nanoparticles [79]. 2 PR-Directed/Magnetic Dipole–Induced Orientation Assembling Here, the PR is formed from the acid hydrolysis of gelatin (type A) [80], whose isoelectric point (pI) is about 9, and possesses long chain-like molecular structures in solution at a moderate temperature.

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