Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 496960
Title Surface Structure of Silver Nanoparticles as a Model for Understanding the Oxidative Dissolution of Silver Ions
Author(s) Molleman, Bastiaan; Hiemstra, Tjisse
Source Langmuir 31 (2015)49. - ISSN 0743-7463 - p. 13361 - 13372.
Department(s) Chair Soil Chemistry and Chemical Soil Quality
Publication type Refereed Article in a scientific journal
Publication year 2015

The toxicity of silver nanoparticles (AgNPs) has been related to the release of ionic silver. This process is influenced by a large variety of factors and is poorly understood. The key to understanding Ag+ release by AgNPs is its subvalency. This is a fundamental property of Ag that can be elucidated by analyzing the crystal structures of a specific class of Ag materials as well as MO/DFT (molecular orbital/density functional theory)-optimized Ag13(OH)4 clusters, being precursors of AgNPs. Semimetallic silver at the (111) faces of AgNPs has a subvalency of +1/3 v.u., forming ≡ Ag3OH0 surface groups with a maximum site density of 4.7 sites/nm2. Oxidative dissolution may remove these groups with the simultaneous formation of oxygen radicals that may further interact with the surface via different pathways. Reactive oxygen species (ROS) can create a circular process with the dissolution of ≡ Ag3OH0, exposure of new metallic sites at the underlying lattice, and subsequent oxidation to ≡ Ag3OH0. This regeneration process is interrupted by the penetration of O radicals into the lattice, forming highly stable Ag6O octahedra with subvalent silver that protects the AgNP from further oxidation. A thermodynamic model has been developed that quantitatively describes the equilibrium condition between ≡ Ag3OH0 and ≡ Ag6O0 and explains a large variety of collectively observed phenomena.

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