Preparation and characterization of monodisperse, mesoporous natural poly(tannic acid)–silica nanoparticle composites with antioxidant properties

• Mesoporous silica particle using Tannic acid (TA) as template can be readily prepared.
• One pot synthesis of p(TA)–Si NP composites with different TA content is reported.
• P(TA)–Si NP composites possessed tunable particle size, surface charge and porosity.
• P(TA)–Si NP composites with antioxidant capability is attractive for biomedical use.

Mesoporous poly(Tannic Acid)–Silica nanoparticle composites (p(TA)–Si NPs) were prepared via one pot reaction. At various TA amounts in feed, 50, 100, 250, 500, 1000 mg at different reaction times, 2, 4, 8, 12, 24 h in the presence of TEOS and epoxy crosslinker, trimethylolpropane triglycidyl ether (TMPGDE), NPs composites were readily prepared. The prepared p(TA)–Si NPs by using 1000 mg TA at 12 h reaction time at room temperature as p(TA)1000–Si NPs provided the highest yield (∼48%). The particle size, monodispersity, specific surface area, porosity, and the gravimetric yields are greatly depended on initial TA concentration and reaction time. The particles sizes were found as 237–445 nm depending on TA content and reaction time. The highest surface area was measured as 872 m2/g for p(TA)1000–Si NPs for 2 h reaction time. The thermal stability of p(TA)–Si NPs decreased as TA content is increased. Interestingly, p(TA)1000–Si NPs are found effective antioxidant materials.

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