@article {AuNP2019,
	title = {Studies of Muonium Reactivity with Uncapped Gold Nanoparticles and with Surface-Adsorbed Benzene on These NPs in Porous Silica Hosts},
	journal = {The Journal of Physical Chemistry C},
	volume = {123},
	number = {45},
	year = {2019},
	pages = {27628-27642},
	abstract = {Gold nanoparticles (AuNPs) have been a subject of considerable interest in recent years due to both their magnetic and catalytic properties. This paper reports a two-fold study of the reactivity at 300 K of the isotopic hydrogen atom, muonium (Mu = μ+e{\textendash}), (i) with bare uncapped AuNPs of different sizes encapsulated in mesoporous (SBA-15) silica hosts, forming a diamagnetic final state in the Mu + AuNP {\textrightarrow} MuAuNP reaction, and (ii) with surface-adsorbed benzene on these NPs forming the muoniated cyclohexadienyl radical in the Mu + C6H6 {\textrightarrow} MuC6H6 addition reaction. The measured muon-spin relaxation rates, λC, for the chemisorption reaction of Mu with the bare AuNPs show some variation with AuNP size. The Mu + C6H6 addition reaction has been studied over a range of benzene loadings both on bare silica and in the AuNP/silica samples. The measured muon-spin relaxation rates, λTot, exhibit a linear dependence on benzene concentration over the full range of loadings in both cases, in accord with an Eley{\textendash}Rideal model of surface reactivity. Rate constants, kBz, were determined from this dependence which exhibit a 2{\textendash}3-fold faster reaction rate on the AuNPs than on the bare silica, suggesting a catalytic effect due to benzene adsorbed on these NP surfaces.},
	doi = {10.1021/acs.jpcc.9b08327},
	url = {https://doi.org/10.1021/acs.jpcc.9b08327},
	author = {Fleming, D. G. and MacFarlane, W. A. and Xiao, J. and Arseneau, D. J. and Dehn, M. H. and Kiefl, R. F. and Zamarion, V. M. and Wang, P.-X. and Cao, Y. and MacLachlan, M. J. and Bridges, M. D.}
}
