Does anybody know the possibility of coagulating alkane thiol passivated gold nanoparticles in chlorinated solvents like chloroform, dichloroethane etc? Also let me know if there are any references for this.
by coagulating, I assume you mean you want to filter off the particles by making them assemble into a large construct and filter them off. if you add a non solvent for the waxy alkane to the chloroform the coagulation will occur. you need a non-solvent for the alkane that has solubility with the chloroform. isopropyl alcohol or higher alcohol might work.
You can look at this as well, though they are not in chlorinated solvents, but it is also coagulation of gold nanoparticles:
Photosensitised Seeding of Thiolate-Stabilised Gold Nanoparticles. ChemPhysChem
Volume 12, Issue 1, pages 136–139, January 17, 2011
Photocatalytic Coalescence of Functionalized Gold Nanoparticles. Langmuir, 2010, 26 (3), pp 1548–1550
Are you hoping for reversible aggregation of the gold nanoparticles (i.e. so they can be resuspended in a different solvent later) or cold welding (i.e. so that they're essentially no longer individual nanoparticles, but a larger structure held together by metal-metal bonds)? I know from experience that treating alkanethiol-passivated, 15 nm gold nanoparticles with chloroform or dichloromethane leads to the latter.
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Thanks!!
Thanks all for the interesting and helpful answers...I am working with Hydrophillic gold nanoparticles at DCE-Water interface initially dissolved in aqueous phase. I found that after some time the nanoparticles adsorbed at the interface irreversibly coalesce to form bigger size nanoparticles with metal-metal bonds.... that is why looking for possible reason for these coalescence. I am also irradiating the interface with X-rays 30 keV and Laser 532 nm 15 mW. I think from the above answers I have all the reasons to get coalescence. Please let me know if you guys have seen such a kind of irreversible coalescence at liquid liquid interface.
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