Abstract Details
(2020) The Biogeochemistry of Precious Metals; in Memorium of Frank Reith
Reith F, Shuster J & Southam G
https://doi.org/10.46427/gold2020.2187
The author has not provided any additional details.
11b: Room 3, Saturday 27th June 07:39 - 07:42
Frank Reith
View all 3 abstracts at Goldschmidt2020
View abstracts at 12 conferences in series
Jeremiah Shuster View all 4 abstracts at Goldschmidt2020 View abstracts at 11 conferences in series
Gordon Southam View all 5 abstracts at Goldschmidt2020
Jeremiah Shuster View all 4 abstracts at Goldschmidt2020 View abstracts at 11 conferences in series
Gordon Southam View all 5 abstracts at Goldschmidt2020
Listed below are questions that have been submitted by the community that the author will try and cover in their presentation. To submit a question, ensure you are signed in to the website. Authors or session conveners approve questions before they are displayed here.
Submitted by Greg Druschel on Monday 22nd June 18:05
Thanks Gordon for that lovely presentation and tribute. I have followed Frank's work for many years, and I recall the first time seeing his ideas about the biological role in gold precipiation as a paradigm shift for me, I was very sad to hear of his passing. The images you have shown are striking in the development of crystalline forms of gold and the more globular/amorphous(?) nanoparticulates. Do you think that organic substrates associated with these bacteria play any sort of templating effect on the cystallographic frameworks which seem so different, or is this an extension of timing associated with recrystallization and ostwald ripening (or something else I have not considered)? - G. Druschel
Hi Greg! Nice to hear from you. Slide 24 in this talk (3 from the end) shows a sulphidic biofilm with Au 'beads' plated onto EPS, bacterial nanowires? In most (all?) of our bacteria-gold experiments we start with colloids and end up with octahedral gold crystals, consistent with crystallisation / ostwald ripening. The early work from the 1990's demonstrated solid stated reordering into increasingly crystalline gold. I don't think that organic templates are required but organo-complexing of Au with S-bearing compounds may provide the Au to help feed this process. Regards, Gordon.
Thanks Gordon for that lovely presentation and tribute. I have followed Frank's work for many years, and I recall the first time seeing his ideas about the biological role in gold precipiation as a paradigm shift for me, I was very sad to hear of his passing. The images you have shown are striking in the development of crystalline forms of gold and the more globular/amorphous(?) nanoparticulates. Do you think that organic substrates associated with these bacteria play any sort of templating effect on the cystallographic frameworks which seem so different, or is this an extension of timing associated with recrystallization and ostwald ripening (or something else I have not considered)? - G. Druschel
Hi Greg! Nice to hear from you. Slide 24 in this talk (3 from the end) shows a sulphidic biofilm with Au 'beads' plated onto EPS, bacterial nanowires? In most (all?) of our bacteria-gold experiments we start with colloids and end up with octahedral gold crystals, consistent with crystallisation / ostwald ripening. The early work from the 1990's demonstrated solid stated reordering into increasingly crystalline gold. I don't think that organic templates are required but organo-complexing of Au with S-bearing compounds may provide the Au to help feed this process. Regards, Gordon.
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