| Gamma-radiation induced formation of chromium oxide nanoparticles from dissolved dichromate. | |
| | |
MedLine Citation:
|
PMID: 23147715 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
|
The formation of chromium oxide nanoparticles by gamma radiolysis of Cr(VI) (CrO(4)(2-) or Cr(2)O(7)(2-)) solutions was investigated as a function of pH and initial Cr(VI) concentration by measuring [Cr(VI)], the particle concentration ([Cr(III)(col)]) and [H(2)], and by characterizing the particles using TEM, Raman, FTIR and XPS. The results show that Cr(VI) is easily reduced to Cr(III) by a homogeneous aqueous reaction with ˙e(aq)(-), but, due to the stability of Cr(III) colloids, the growth of the Cr(OH)(3) particles is very slow. As the particles grow the interior of the particle dehydrates to form Cr(2)O(3) while the outer layer remains hydrated. When most of the Cr(VI) that is initially present in the solution is converted to Cr(OH)(3) further redox reactions of chromium species occur on the particle surfaces. The redox system reaches a pseudo-equilibrium state due to cyclic reactions of Cr(III) with ˙OH and H(2)O(2), and reactions of Cr(VI) with ˙e(aq)(-) and H(2)O(2). The size distribution of the particles that are formed is controlled by these solution-solid interface reactions. |
| | |
Authors:
|
L M Alrehaily; J M Joseph; A Y Musa; D A Guzonas; J C Wren |
Related Documents
:
|
725515 - A comparison of glucagon, gastric inhibitory peptide, and secretin on gallbladder funct... 7235015 - Determination of the apparent transport constants for urate absorption in the rat proxi... 22950605 - Molecular dynamics studies on the adaptability of an ionic liquid in the extraction of ... 5042885 - Serum electrolytes and skeletal mineralization in hard- and soft-water areas. 21405905 - How water droplets evaporate on a superhydrophobic substrate. 23427835 - Rate acceleration of the heterogeneous reaction of ozone with a model alkene at the air... |
Publication Detail:
|
Type: JOURNAL ARTICLE Date: 2012-11-13 |
Journal Detail:
|
Title: Physical chemistry chemical physics : PCCP Volume: - ISSN: 1463-9084 ISO Abbreviation: Phys Chem Chem Phys Publication Date: 2012 Nov |
Date Detail:
|
Created Date: 2012-11-13 Completed Date: - Revised Date: - |
Medline Journal Info:
|
Nlm Unique ID: 100888160 Medline TA: Phys Chem Chem Phys Country: - |
Other Details:
|
Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
|
Department of Chemistry, The University of Western Ontario, London, Ontario, CanadaN6A 5B7. jcwren@uwo.ca. |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
|
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Baicalin and Scutellarin Are Proteasome Inhibitors that Specifically Target Chymotrypsin-like Cataly...
Next Document: Neutral tetrathia[22]annulene[2.1.2.1] based field-effect transistors: improved on/off ratio defies ...