Interaction between amino-functionalized inorganic nanoshells and acid-autocatalytic reactions

• Published in: Physical chemistry chemical physics : PCCP Vol. 20; no. 19; pp. 13365 - 13369
• Main Authors: Lantos, Emese, Das, Nirmali Prabha, Berkesi, Dániel Simon, Dobó, Dorina, Kukovecz, Ákos, Horváth, Dezső, Tóth, Ágota
• Format: Journal Article
• Language: English
• Published: England Royal Society of Chemistry 2018
• Subjects: Convection; Front velocity; Hydrogen ions; Nanospheres; Organic chemistry; Propagation velocity; Silicon dioxide
• ISSN: 1463-9076; 1463-9084
• DOI: 10.1039/c8cp01053f

Amino-functionalized inorganic silica nanoshells with a diameter of 511 ± 57 nm are efficiently used as hydrogen ion binders with a base dissociation constant of (1.2 ± 0.1) × 10-4. The hydrogen removal has been shown to produce reaction-diffusion fronts of constant propagation velocity in the autocatalytic chlorite-tetrathionate reaction when it is run in thin planar slices of nanoshell-containing agarose gel to exclude all convection related effects. By controlling the exact amount of amino-functionalized hollow nanospheres in the gel matrix it is possible to finely tune the propagation velocity of the chemical front in the 0.1-10 cm h-1 range. Remarkably, this can be achieved with very low amino-functionalized hollow inorganic nanosphere loadings between 0.1-0.01 (m V-1)%. The front width has also been determined experimentally, which increases by a factor of two with one magnitude decrease in the front velocity.