A novel gold nanoparticle stabilization and its muon chemistry

Naked Gold Nanoparticles and hot Electrons in Water

“…In the present work, this technique was extended to naked gold nanoparticles stabilized with ionic liquids in water. The ionic liquids in water provide novel environmentally friendly synthetic methods for making long-term stable (more than six months) metal nanoparticles in solvents without using covalent bonds nor with strong intermolecular interactions with the gold atoms on the surface 6 , 7 . The radiolysis from ionizing radiation, typically used in radiation therapy, in water leads to production of many transient intermediates and stable products 11 .…”

“…Availability of such surface atoms is an important factor for many applications that rely on the reactivity of nanoparticles and their interaction with light 6 – 8 . Gold nanoparticles in which all surface atoms are available (naked gold nanoparticles), in particular when soluble in water, have been proposed for novel applications in radiation therapy and energy production 6 – 8 , based on their effects on their proposed luminescence under Cerenkov radiation 8 , and indirect observation of the fastest electron capture rate constant in water for pre-solvated electrons 6 , 7 . Despite the consistent picture of ultrafast electron capture via indirect scavenging measurements and computational results 6 , there has never been any direct evidence of such efficient pre-solvated electron capture by gold nanoparticles in water.…”

Ultra-fast electron capture by electrosterically-stabilized gold nanoparticles

“…At very high concentrations (e.g. 44 The temperature dependence of the electron/AuNP reaction reported here demonstrates the potential of AuNP/IL suspensions to interact with and capture electrons on timescales within solvated electron equilibration times (dry/presolvated electron capture). 46 Aqueous suspensions of Au/bac-14 NPs were found to scavenge electrons at unprecedented rates, k e = 5 × 10 14 M −1 s −1 at μM concentrations.…”

“…44 In the present work, to determine the rate of electron capture by AuNP/bac-14 in solution as a function of temperature, positive anti-muons (µ + ) 45 were used as spin probes as well as the ionizing radiation. 44 Non-covalent interactions of ionic liquids and colloidal metals have been known to facilitate catalytic transformations. At very high concentrations (e.g.…”

Gold Nanoparticle Surface Functionalization: A Necessary Requirement in the Development of Novel Nanotherapeutics

“…Since GNPs produced using NaBH 4 are not capped with the reducing agent as is the case with the Turkevich method, a separate capping agent must be used during synthesis. Long-term stabilization has been reported with GNPs non-covalently stabilized by benzyldimethyltetradecylammonium chloride, with nanoparticles maintaining their size over subsequent months [21]. The requirement to use a separate capping agent during synthesis makes any subsequent surface modification of these GNP more problematic than is the case with citrate capped GNPs.…”