Reduction and Aggregation of Silver Ions at the Surface of Colloidal Silica. Lawless, D., Kapoor, S., Kennepohl, P., Meisel, D., & Serpone, N. J. Phys. Chem., 98(38):9619-9625, 9, 1994. ![Reduction and Aggregation of Silver Ions at the Surface of Colloidal Silica [pdf]](https://bibbase.org/img/filetypes/pdf.svg "pdf")
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Website doi abstract bibtex The reduction of silver ions at the surface of 40 Angstrom colloidal silica particles at pH 9 has been studied using the pulse radiolysis technique. The rate of reaction of e(aq)(-) with Ag+ increases linearly with an increase in the Ag+/SiO2 ratio until a ratio of 12:1 is reached. At this loading the reaction becomes independent of the silver concentration at the particle surface. Ag-0 and Ag-2(+), the first products of silver ion reduction in aqueous solution, have been identified by their absorption spectra as the primary species formed by the reduction of silver ions at the surface of SiO2. Within the time window of the experiments (less than or equal to 200 mu s) there is no evidence of larger silver cluster formations (e.g., Ag-4(2+)) that are formed under identical conditions in the absence of silica. Evidently, the silica surface stabilizes the Ag-2(+) cation. Irradiation of Ag+/SiO2 solutions with trains of electron pulses leads to the formation of two small silver clusters exhibiting spectral bands at 290 and 330 nm and the conventional colloidal particle with its. band at similar to 400 nm.. These clusters are stable-in the presence of oxygen for at least several weeks. Addition of redox active and reducing agents confirmed that the three spectral bands originate from three different clusters.
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title = {Reduction and Aggregation of Silver Ions at the Surface of Colloidal Silica},
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year = {1994},
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abstract = {The reduction of silver ions at the surface of 40 Angstrom colloidal silica particles at pH 9 has been studied using the pulse radiolysis technique. The rate of reaction of e(aq)(-) with Ag+ increases linearly with an increase in the Ag+/SiO2 ratio until a ratio of 12:1 is reached. At this loading the reaction becomes independent of the silver concentration at the particle surface. Ag-0 and Ag-2(+), the first products of silver ion reduction in aqueous solution, have been identified by their absorption spectra as the primary species formed by the reduction of silver ions at the surface of SiO2. Within the time window of the experiments (less than or equal to 200 mu s) there is no evidence of larger silver cluster formations (e.g., Ag-4(2+)) that are formed under identical conditions in the absence of silica. Evidently, the silica surface stabilizes the Ag-2(+) cation. Irradiation of Ag+/SiO2 solutions with trains of electron pulses leads to the formation of two small silver clusters exhibiting spectral bands at 290 and 330 nm and the conventional colloidal particle with its. band at similar to 400 nm.. These clusters are stable-in the presence of oxygen for at least several weeks. Addition of redox active and reducing agents confirmed that the three spectral bands originate from three different clusters.},
bibtype = {article},
author = {Lawless, Darren and Kapoor, Sudhir and Kennepohl, Pierre and Meisel, Dan and Serpone, Nick},
doi = {10.1021/j100089a042},
journal = {J. Phys. Chem.},
number = {38}
}
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The rate of reaction of e(aq)(-) with Ag+ increases linearly with an increase in the Ag+/SiO2 ratio until a ratio of 12:1 is reached. At this loading the reaction becomes independent of the silver concentration at the particle surface. Ag-0 and Ag-2(+), the first products of silver ion reduction in aqueous solution, have been identified by their absorption spectra as the primary species formed by the reduction of silver ions at the surface of SiO2. Within the time window of the experiments (less than or equal to 200 mu s) there is no evidence of larger silver cluster formations (e.g., Ag-4(2+)) that are formed under identical conditions in the absence of silica. Evidently, the silica surface stabilizes the Ag-2(+) cation. Irradiation of Ag+/SiO2 solutions with trains of electron pulses leads to the formation of two small silver clusters exhibiting spectral bands at 290 and 330 nm and the conventional colloidal particle with its. band at similar to 400 nm.. 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