Control of interfacial pH in mesoporous silica nanoparticles via surface functionalization

Singappuli-Arachchige, Dilini; Slowing, Igor I.

doi:10.1063/1.5138912

Title: Control of interfacial pH in mesoporous silica nanoparticles via surface functionalization

Journal Article · 15 January 2020 · Journal of Chemical Physics

DOI: https://doi.org/10.1063/1.5138912 · OSTI ID:1594062

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Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States)

The pH at silica-water interfaces (pH_int) was measured by grafting a dual emission fluorescent probe (SNARF) onto the surface of mesoporous silica nanoparticles (MSN). The values of pH_int of SNARF-MSN suspended in water were different from the pH of the bulk solution (pH_bulk). The addition of acid or base to aqueous suspensions of SNARF-MSN induced much larger changes in pH_bulk than pH_int, indicating that the interface has buffering capacity. Grafting additional organic functional groups onto the surface of SNARF-MSN controls the pH_int of its buffering region. The responses of pH_int to variations in pH_bulk are consistent with the acid/base properties of the surface groups as determined by their pK_a and are affected by electrostatic interactions between charged interfacial species as evidenced by the dependence of ζ-potential on pH_bulk. Finally, as a proof of principle, we demonstrate that the hydrolysis rate of an acid-sensitive acetal can be controlled by adjusting pH_int via suitable functionalization of the MSN surface. Our findings can lead to the development of nanoreactors that protect sensitive species from adverse conditions and tune their chemical reactivity.

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Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 1594062

Report Number(s):: IS-J--10118

Journal Information:: Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 3 Vol. 152; ISSN 0021-9606

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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