Pradhan, Sulolit and Brown, Lauren E. and Konopelski, Joseph P. and Chen, Shaowei (2009) Janus nanoparticles: reaction dynamics and NOESY characterization. Journal of Nanoparticle Research, 11 (8). pp. 1895-1903.
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Official URL: http://www.springerlink.com/content/954190172004l4...
Janus nanoparticles were prepared by taking advantage of interfacial ligand exchange reactions of hydrophobic hexanethiolate-protected gold nanoparticles with hydrophilic 2-(2-mercaptoethoxy)ethanol (MEA). A monolayer of the particles was first formed at the airâwater interface by the Langmuir technique and then deposited onto a substrate surface by the Langmuir-Blodgett method. The particle monolayer was then immersed into an aqueous solution of MEA for different periods of time. It was found that the exchange reactions occurred but were limited only to the top face of the nanoparticles and the reaction reached equilibrium in about 8Â h. The resulting particles exhibited amphiphilic characters as confirmed by contact angle and UV-visible, FTIR and NMR spectroscopic measurements. Of these, the structural discrepancy between the Janus nanoparticles and bulk-exchanged particles was clearly manifested, in particular, by NOESY NMR measurements.
|Uncontrolled Keywords:||Janus nanoparticles, Langmuir–Blodgett, Contact angle, NOESY NMR, Surface plasmon, Exchange reactions, Monolayer|
|Subjects:||Analytical Science > Microscopy and probe methods|
Material Science > Nanochemistry
|Deposited On:||05 Jan 2010 14:02|
|Last Modified:||05 Jan 2010 14:02|
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