Hierarchically Porous Anatase Nanoparticles Derived from One-Dimensional Lepidocrocite Titanate for Bisphenol-A Photodegradation.

Herein, we discuss the conversion of one-dimensional lepidocrocite (1DL) titanate nanofilaments to anatase. Upon heating at temperatures >400 °C, the hierarchical 1DLs porous mesostructured particles transform to anatase, while retaining their morphology. These assemblies are characterized via X-ray diffraction, scanning and transmission electron microscopy, Fourier transform infrared spectroscopy, and solid-state ultraviolet absorbance.

Colloidal Stability, Sedimentation, and Aggregation of Crystalline Two-Dimensional Crumpled Birnessite Flakes, Their Dye Adsorption and Immune Cell Response.

Highly crystalline two-dimensional (2D) flakes of birnessite, a polymorph of manganese oxide with a MnO chemistry, were synthesized by reacting manganese oxide, MnO, at 80 °C with aqueous solutions of tetramethylammonium hydroxide (TMAH) for tens of hours. Their colloidal stability, aggregation, and sedimentation were studied as a function of ionic strengths of Na and Li cations. After reaction, a water-based stable colloidal suspension (ζ-potential ∼ -31 ± 1 mV) was obtained.