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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Gaber, M. Hussein, Mohamed M. Ebeid, El-Zeiny M. Al-Kady, Ahmed S. |
| Description | Country affiliation: Egypt Author Affiliation: Al-Kady AS ( Chemistry Department, Faculty of Science, Tanta University, Tanta, Egypt.) |
| Abstract | Nanoparticles of the dominant hematite form ( -Fe(2)O(3)) of iron oxide have been prepared by a simple route of dropping FeCl(3) solution into boiling water. The nanoparticles have been characterized by transmission electron microscopy (TEM), UV-visible electronic absorption spectroscopy, chemical stoichiometry, thermal analysis methods (TGA, DSC and DTA), XRD, FTIR and magnetic susceptibility measurements. Kinetic analysis of the DSC calorigram of thermal dehydration of the nanoparticles reveals one stage of the dehydration process of energy of activation of 29.0 kJ mol(-1). The role of iron oxide nanoparticles in fluorescence quenching of coumarin thiourea derivatives (I-IV) was investigated at room temperature (296 K) by means of steady-state fluorescence spectroscopy. The quenching process was characterized by Stern-Volmer (S-V) plots which display a positive deviation from linearity. This could be explained by static and dynamic quenching models. The positive deviation in the S-V plot is interpreted in terms of ground-state complex formation model and sphere of action static quenching model. Various rate parameters for the ï¬ uorescence quenching process were determined by using the modiï¬ ed Stern-Volmer equation. The sphere of action static quenching model agrees very well with experimental results. Quenching constants for iron oxide nanoparticles are about four orders of magnitudes higher than quenching by Fe(3+) ions. |
| ISSN | 13861425 |
| Issue Number | 1 |
| Journal | Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy |
| Volume Number | 83 |
| e-ISSN | 18733557 |
| Language | English |
| Publisher | Elsevier |
| Publisher Date | 2011-12-01 |
| Publisher Place | Great Britain (UK) |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Ferric Compounds Chemistry Nanoparticles Ultrastructure Spectrometry, Fluorescence Spectrophotometry, Ultraviolet Spectroscopy, Fourier Transform Infrared Journal Article Discipline Spectroscopy |
| Content Type | Text |
| Resource Type | Article |
| Subject | Spectroscopy Atomic and Molecular Physics, and Optics Analytical Chemistry Instrumentation |
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