Synthesis of Zerovalent Nanophase Metal Particles Stabilized with Poly(ethylene glycol)
Concurrent sonolysis of iron pentacarbonyl and poly(ethylene glycol)-400 (PEG-400) in hexadecane solvent proceeds via zero-order kinetics and results in Fe nanoparticles encapsulated in PEG-400 (Fe−PEG). The transmission electron microscopy images show Fe−PEG consisting of <3 nm Fe particles that...
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Published in | Langmuir Vol. 20; no. 16; pp. 6896 - 6903 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
United States
American Chemical Society
03.08.2004
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Subjects | |
Online Access | Get full text |
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Summary: | Concurrent sonolysis of iron pentacarbonyl and poly(ethylene glycol)-400 (PEG-400) in hexadecane solvent proceeds via zero-order kinetics and results in Fe nanoparticles encapsulated in PEG-400 (Fe−PEG). The transmission electron microscopy images show Fe−PEG consisting of <3 nm Fe particles that are evenly dispersed in the PEG matrix. Mössbauer and X-ray absorption fine structure/X-ray absorption near-edge structure data reveal an ordered PEG assembly that helps protect the zerovalent Fe core. The Fe nanoparticles in Fe−PEG are superparamagnetic with a magnetization value of 45 emu/g-Fe at 10 KOe. The rheology of the synthesized material shows an unusual increase in viscosity with temperature that is likely due to lower critical saturation temperature phase segregation over 40 °C. The low-temperature mobility of the PEG-400 moiety in Fe−PEG would allow facile ligation of the Fe0 core with biologically and chemically active groups. |
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Bibliography: | istex:F358EB5772DF0BF3F8F2A4579B49E1CC22B01088 ark:/67375/TPS-CQP5ZWRB-C ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 DOE/OFFICE OF SCIENCE (US) AC02-98CH10886 BNL-74425-2005-JA |
ISSN: | 0743-7463 1520-5827 |
DOI: | 10.1021/la0497402 |