By Crina Anastasescu, Susana Mihaiu, Silviu Preda, Maria Zaharescu
This publication offers rainy chemical sol-gel and hydrothermal tools for 1D oxide nanostructure coaching. those equipment symbolize an enticing path to multifunctional nanomaterials synthesis, as they're flexible, low-cost and, therefore, acceptable for acquiring quite a lot of oxide fabrics with adapted morphology and houses. 3 particular oxides (SiO2, TiO2, ZnO) are mentioned intimately on the way to illustrate the main of the sol-gel and hydrothermal coaching of 1D oxide nanostructures. different oxides synthesized through this system also are in short offered.
Throughout the publication, the correlation among the tubular constitution and the physico-chemical homes of those fabrics is highlighted. 1D oxide nanostructures show attention-grabbing optical and electric houses, because of their limited morphology. moreover, a well-defined geometry may be linked to chemically lively species. for instance, the natural SiO2 nanotubes provided a mild photocatalytic job, whereas the Pt-doped SiO2 tubular fabrics act as microreactors in catalytic reactions. when it comes to titania and titanate nanotubes, huge particular floor sector and pore quantity, ion-exchange skill, improved gentle absorption, and quick electron-transport strength have attracted major study curiosity. The chemical and actual alterations (microwave assisted hydrothermal tools) mentioned the following enhance the formation kinetics of the nanotubes. The ZnO nanorods/tubes have been ready as random debris or as huge parts of small, orientated 1D ZnO nanostructures on various substrates. within the latter case a sol-gel layer is deposited at the substrate sooner than the hydrothermal coaching. utilizing applicable dopants, coatings of ZnO nanorods with managed electric habit will be obtained.
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Additional info for 1D Oxide Nanostructures Obtained by Sol-Gel and Hydrothermal Methods
These samples have an excellent stability even after an ultrasonication for 1 h. The chemical bonds between the lateral surfaces at the inner bends of the rod contribute to their exceptional structural stability. These doped nanostructures with rutile phase presented a photocatalytic activity in the degradation of methylene blue. 2 41 Physical Modifications The disadvantage of the hydrothermal method is the long time required to obtain nanotubes with adequate structure and morphology. Due to this fact, it is important to keep in mind other methods that shorten the duration of the thermal treatment.
The broadening of the diffraction lines, due to the crystallite size effect and the position of protons and sodium ions inside the crystalline lattice, makes the identification of the crystal structure of obtained TiNTs difficult. Today, it is generally accepted that the layered titanate structures belong to Na2ÀxHxTinO2n+1ÁzH2O family, where 0 x 2, 3 n 6 and z > 0, as previously reported [27, 75]. However, many times the reported results are not completely in agreement and numerous studies focused on determining how the experimental parameters influence the formation mechanism of the nanostructures.
5 Morphological phase diagram of hydrothermally treated anatase, rutile, and P25 Aeroxide. The phase boundaries indicate the relative percentage of the nanostructures formed within each condition rather than contiguous percentage between conditions. 1 Effect of Acid Washing Initially, Kasuga et al.  considered the acid washing as one of the stages of the titania nanotube formation. However, subsequent studies have shown that the acid washing is an ion-exchange process. Even if the mechanism of nanotube formation is ambiguous, it was well established that the acid washing essentially influences the TiNTs characteristics only in determining the relative amount of Na and H atoms in the TiNTs structure.
1D Oxide Nanostructures Obtained by Sol-Gel and Hydrothermal Methods by Crina Anastasescu, Susana Mihaiu, Silviu Preda, Maria Zaharescu
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