Hierarchical rutile TiO2 mesocrystals assembled by nanocrystals-oriented attachment mechanism

Size and Shape Tailoring of Titania Nanoparticles Synthesized by Solvothermal Route in Different Solvents

“…(e)]. The synthesis of rutile TiO2 multibranched structures has been reported in several works . Some of these works reported that the variations in branch morphology are due to the fact that there are two types of twin boundaries, which result in the two types of angles: the most common (101) twin, in agreement with our observations, and the less common (301) twin for 114° and 55°, respectively.…”

“…On the other hand, the results observed in this study strongly support the evolution of the units according to the hierarchical growth mechanism. The hierarchical growth process has been reported by other authors in TiO 2 synthesis with different morphologies . To understand this formation process, we assumed that our reaction system is highly inhomogeneous, compounded by an assembly of homogeneous subregions which display variations in their reaction conditions.…”

“…Over the last years, a well‐established mechanism for the growth of multidimensional TiO 2 is the oriented attachment (OA) mechanism . In this process, low mass and very large surface area nanocrystallites can cluster spontaneously to reduce overall energy by removing surface energy, attracted by adjacent exposed surfaces with a common crystallographic orientation.…”

“…Over the last years, a well-established mechanism for the growth of multidimensional TiO 2 is the oriented attachment (OA) mechanism. [11][12][13][14][15] In this process, low mass and very large surface area nanocrystallites can cluster spontaneously to reduce overall energy by removing surface energy, attracted by adjacent exposed surfaces with a common crystallographic orientation. The OA mechanism is relevant in cases where particles are free to move, which can take place in a well dispersed or a weakly flocculated colloidal state.…”

Hollow TiO2 microspheres assembled with rutile mesocrystals: Low-temperature one-pot synthesis and the photocatalytic performance

“…Up to now, TiO 2 mesocrystals with various morphologies have been synthesized, including nanorods [15], nanoflowers [5], hollow nanobricks [16], dumbbell-shaped mesocrystals, [17] and sheets [18]. TiO 2 mesocrystals are mainly fabricated by hydrothermal [19,20] and solvothermal reactions [21][22][23], which demand both a high reaction temperature and a high pressure atmosphere. Topotactic conversions of NH 4 TiOF 3 precursors [18,24,25] are capable of producing TiO 2 mesocrystals under a relatively low temperature and in an open atmosphere; however, the synthesis procedure is surfactantdependent, or involves the releases of dangerous gas.…”