So i just lately gotten started with making nanogold solutions, since i dont live in the US i cant get karo syrup, i did however try to use honey instead of karo syrup, 11g honey in 60mL demineralized water. I cant find anything on whats actually in "karo syrup", only that they dont use high fructose corn syrup.
I added a couple drops of 10.6% Na2CO3 solution with 3 drops of karo replacement. It didnt do much, i mixed that with 10mL 0.001M HAuCl4 solution and 30mL 1ppm H2O and let it heat up well. First when i added a pinch of sodium citrate that i bought things started getting interesting. It was probably around 80*C at this point, so i let it cool down and gelled it up with a bit of gelatine solution, but now after being in fridge for half a day it appears magenta? Could the sodium citrate be in too high concentration causing it to digress a bit? Im not entirely sure if i have managed to make bright red colloidal solutions yet or if they are at best dark red.
My experimental batches were 10mL 0.001M HAuCl4 solution (1.6mg HAuCl4; 0.9mg Au) which went into a total of 40mL solution that being 22.5ppm. Ive seen other members producing solutions that seems much brighter red, but when i try to continously heat it it just ends up turning purple or precipitating out, it can stay on heating for quite a while in this deep red phase.
I made a 2.5% sodium citrate solution and 13 drops weighting 490mg seemed to be enough, that would be 12.25mg of Sodium Citrate (unsure if this is mono di or trisodium citrate..)
So what im really asking is.. Should it be possible to increase in particle size (or well, coalesce) when gelled and refridgerated, and what may i do to lower particle size past dark red? If it would be possible to turn the now magenta solution into pure red i would be very interested in that.
Oh- i also have 1kg of xanthan gum, could that work for stabilizing gold nanoparticles?