Self-Assembly of Flowerlike AlOOH (Boehmite) 3D Nanoarchitectures

Abstract

In this work, a hydrothermal route using an ethanol-water solution to progressively synthesize a sequence of flowerlike three-dimensional gamma-AlOOH boehmite nanostructures without employing templates or matrixes for self-assembly is presented. The flowerlike boehmite nanoarchitectures exhibit three hierarchies of self-organization, i.e., single-crystalline nanorods, nanostrips, and bundles, which are characterized by scanning and transmission electron microscopy. The sequence of products obtained after different processing times indicates a self-assembly mechanism. The hydrogen bonding on the surface of nanorods or nanostrips possibly plays a key role, as identified by FTIR spectra of the products after they had been heated to 1000 degrees C. The specific surface area and pore-size distribution of the obtained product as determined by gas-sorption measurements show that the boehmite nanoarchitectures exhibit high BET surface area and porosity properties.

Facile hydrothermal synthesis of uniform 3D γ‐AlOOH architectures assembled by nanosheets

“…Therefore, a plausible growth mechanism is proposed based on the above results. In the initial stage, the anhydrate AlCl 3 is hydrolyzed in the mixture solvent to form amorphous Al(OH) 3 colloids, which is similar to the previous report [16]. Then the Al(OH) 3 colloids are transformed into AlOOH nanoparticles at elevated temperature in the hydrothermal surroundings.…”

“…Therefore, boehmite with various morphologies and sizes has attracted considerable interest in the past few years. So far, boehmite with different morphologies, such as nanotubes [11,12], nanobelts [13], nanofibers [14,15], flower-like [16] and cantaloupe-like [17] nanostructures, have been synthesized through various methods. However, to the best of our knowledge, the synthesis of uniform 3D γ-AlOOH architectures via DMSO-H 2 O system has not yet been reported.…”

3D-boxlike polyaniline microstructures with super-hydrophobic and high-crystalline properties

“…Synthesis of nanomaterials with well-controlled morphology and size is a key issue in current nano-science research because they are key parameters to determine the optical, electronic, magnetic, and chemical properties [1][2][3][4][5][6][7]. In particular, to synthesize complex three-dimensional (3D) architectures in nanometer or micrometer is desirable for advanced functional nanomaterials via a self-assembly process [4,5].…”

Synthesis of Pt/Al2O3 catalyst using mesoporous alumina prepared with a cationic surfactant

“…Also, flowerlike three-dimensional nanoarchitecture of boehmite have been observed by Zhang et al [41]. Other authors had found nanosheets when their preparation of boehmite samples reached a pH near 7 [42] and also plate-shaped particles when their preparation was made with NaOH at pH of 7 [18].…”