Physiochemical Characterization of Iodine (V) Oxide Part II: Morphology and Crystal Structure of Particulate Films

Crystals

Brian K. Little¹  Samuel B. Emery³  C. Michael Lindsay² 

[1] University of Dayton Research Institute, U.S. Air Force Research Laboratory, Eglin AFB, FL 32542, USA;U.S. Air Force Research Laboratory, Energetic Materials Branch, Eglin AFB, FL 32542, USA; E-Mail:;Naval Surface Warfare Center Indian Head Explosive Ordinance Technology Division, Indian Head, MD 20640, USA; E-Mail:

关键词: iodine (V) oxide;    iodine pentoxide;    I₂O₅;    hydrogen iodate;    triperiodic acid;    HI₃O₈;    HIO₃-I₂O₅;    iodic acid;    HIO₃;    spin coating;    drop casting;    film;   

DOI  :  10.3390/cryst5040534

来源: mdpi

【 摘 要 】

In this study, the production of particulate films of iodine (V) oxides is investigated. The influence that sonication and solvation of suspended particles in various alcohol/ketone/ester solvents have on the physical structure of spin or drop cast films is examined in detail with electron microscopy, powder x-ray diffraction, and UV-visible absorption spectroscopy. Results indicate that sonicating iodine oxides in alcohol mixtures containing trace amounts of water decreases deposited particle sizes and produces a more uniform film morphology. UV-visible spectra of the pre-cast suspensions reveal that for some solvents, the iodine oxide oxidizes the solvent, producing I₂ and lowering the pH of the suspension. Characterizing the crystals within the cast films reveal their composition to be primarily HI₃O₈, their orientations to exhibit a preferential orientation, and their growth to be primarily along the ac-plane of the crystal, enhanced at higher spin rates. Spin-coating at lower spin rates produces laminate-like particulate films versus higher density, one-piece films of stacked particles produced by drop casting. The particle morphology in these films consists of a combination of rods, plates, cubes, and rhombohedra structure.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.