Recently, there has been a strong focus on inorganic morphosynthesis, leading to the concepts of "chemistry of shapes" or synthesis over "all length scales".[1] To achieve hierarchical architectures, mineralization can be confined to different length-scale interfaces, as demonstrated by the growing field of bioinspired materials. [2] In this context, three main strategies can be identified. The first makes use of macroscopic patterns via metastable thermodynamic systems (emulsions, [3] reverse emulsions, [4] or air-liquid foams [5] ), while generating mesotexturation using supramolecular organization. One can take advantage of mesoscopic supramolecular templating effects, where the induced inorganic texturation extends to higher length scales; for instance, the chirality information embedded in a molecule can be carried forward to shape architectures at longer length scales. [6] A second method involves the use of either a preformed microorganism [7] or preexisting colloidal opal-like organic textures.[8] Also, it has been recently been demonstrated that hierarchical systems can be generated with high-aspect-ratio carbon particles (possessing strong anisotropy), where organization at higher length scales is achieved through extrusion processes.[9]Furthermore, inorganic polymers, such as silica, titanium dioxide, vanadium oxide, etc., can be patterned using the abovementioned patterning strategies. Particularly, extensive interest has been focused on vanadium oxides mainly because of their structural diversity and potential applications in areas such as heterogeneous catalysis, cathode materials for advanced lithium batteries, visible-light photochromism, and electrochromic devices. [10,11] Also, it is worthwhile to note that this particular interest, beyond the structural and electronic properties, is certainly enhanced by the fact that aqueous V 2 O 5 gels are one of the best examples of materials synthesized by the sol-gel process, [12,13] where "chimie douce", or soft chemistry, [14] offers the possibility of shaping and organizing the inorganic polymer at different length scales. These soft-synthesis approaches allow the fabrication of either hybrid organic-inorganic materials whose properties are influenced by each individual constituent, [15,16] or gels with properties arising from textural singularity, i.e., the strong anisotropy of the nanoscopic ribbons constituting the gel promotes nematic liquid crystal behavior. [17][18][19][20] Making use of an extrusion strategy already applied in our laboratory for the unidirectional organization of carbon nanotubes, [9] we have generated for the first time macroscopic vanadium oxide fibers with strong intrinsic one-dimensional (1D) organization of vanadium oxide nanoscopic ribbon subunits. Using the general process described in the Experimental section and in the Supporting Information (Fig. S1), vanadium oxide macroscopic fibers can be obtained (Fig. 1).Beyond fabrication of vanadium oxide fibers we have observed good transversal flexibility, which allows for...
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