One process: Uniform Silver Nanowires Synthesis by Reducing AgNO3 with Ethylene Glycol in the Presence of Seeds and Poly(Vinyl Pyrrolidone)
"A solution-phase approach has been demonstrated for the large-scale synthesis of silver nanowires with diameters in the range of 30−40 nm, and lengths up to ∼50 μm. The first step of this process involved the formation of Pt (or Ag) nanoparticles by reducing PtCl2 (or AgNO3) with ethylene glycol (EG) heated to ∼160 °C. These Pt (or Ag) nanoparticles could serve as seeds for the heterogeneous nucleation and growth of silver (formed by reducing AgNO3 with EG) because of their close match in crystal structure and lattice constants. In the presence of poly(vinyl pyrrolidone) (PVP), the growth of silver could be directed into a highly anisotropic mode to form uniform nanowires with aspect ratios as high as ∼1000. UV−visible spectroscopy, SEM, TEM, XRD, and electron diffraction were used to characterize these silver nanowires, indicating the formation of a highly pure phase, as well as a uniform diameter and bicrystalline structure. Both morphology and aspect ratios of these silver nanostructures could be varied from nanoparticles and nanorods to long nanowires by adjusting the reaction conditions, including the ratio of PVP to silver nitrate, reaction temperature, and seeding conditions. Measurements of the transport properties at room temperature indicated that these silver nanowires were electrically continuous with a conductivity (∼0.8 × 105 S/cm) approaching that of bulk silver." <http://pubs.acs.org/doi/abs/10.1021/cm020587b?journalCode=cmatex> On Fri, Jan 9, 2015 at 12:39 AM, Neville <[email protected]> wrote: > Quote from article..."Clothing coated in AgNWs would feel virtually > identical to normal clothing because such a small amount of AgNW > solution..." end quote. > > I see the word 'solution' there, is this simply like dipping a pair of > socks into your solution while it's brewing? > > Those two words don't seem to go together for me - 'AgNW' and 'solution'? > So which is it, is the clothing full of minute silver wires, or is it just > clothing dipped in a silver solution? > > N. > > Read more at: http://phys.org/news/2015-01-super-insulated-indoor.html#jCp > ------------------------------ > Date: Thu, 8 Jan 2015 21:52:34 -0600 > Subject: Re: CS>Silver nanowire as insulation > From: [email protected] > To: [email protected] > > > It would have to be nanowire, but how they make that, I don't know. > > On Thu, Jan 8, 2015 at 10:10 AM, André Juthe <[email protected]> > wrote: > > Does that mean that you could dip your clothes in your silver solution in > order to get some of that effect or does it have to be nanowires? > > 2015-01-08 17:01 GMT+01:00 Dan Nave <[email protected]>: > > Well, it IS about silver... > > <http://phys.org/news/2015-01-super-insulated-indoor.html> > > "(Phys.org)—By wearing clothes that have been dip-coated in a silver > nanowire (AgNW) solution that is highly radiation-insulating, a person may > stay so warm in the winter that they can greatly reduce or even eliminate > their need for heating their home. Considering that 47% of global energy is > spent on indoor heating, and 42% of that specifically for residential > heating, such highly insulating clothing could potentially have huge cost > savings." > > > >
