Hierarchically Ordered α-Zirconium Phosphate Platelets in Aqueous Phase with Empty Liquid.

Area of Science:

• Materials Science
• Colloid Science
• Nanotechnology

Background:

• Alpha-zirconium phosphate (α-ZrP) platelets can be exfoliated into aqueous dispersions using alkanol amines.
• These exfoliated platelets form tactoids and nematic liquid crystalline phases.
• Hierarchical assembly of α-ZrP is influenced by hydrolysis and processing conditions.

Purpose of the Study:

• To investigate the colloidal processing of exfoliated α-ZrP platelets with polymer particles.
• To understand the self-assembly and film formation of α-ZrP/polymer composites.
• To explore the influence of polymer size on composite morphology and properties.

Main Methods:

• Exfoliation of α-ZrP using reflux in phosphoric acid and alkanol amines.
• Colloidal processing involving freeze-drying and dispersion with polymer particles.
• Real-time small-angle X-ray scattering (SAXS) and transmission electron microscopy (TEM) for characterization.

Main Results:

• Exfoliated α-ZrP platelets form tactoids and liquid crystalline phases.
• Composite films are formed by separate drying of α-ZrP and polymer particles.
• The morphology of the composite films is tunable by the size of the polymer colloids.
• Hydrolysis during exfoliation impacts α-ZrP assembly, confirmed by ultra-filtration and oxoanion studies.

Conclusions:

• Colloidal processing enables the creation of α-ZrP/polymer composite films with tunable morphology.
• Polymer particle size is a key factor in controlling the hierarchical structure of the composite materials.
• Understanding α-ZrP synthesis and hydrolysis is crucial for controlling its assembly and properties.