I have synthesized Magnetite Nanoparticles using Cyanobacterial Polysaccharide crystals and as the nanoparticles are not dissolved, I am not able to proceed with my work . Can any one help me in dissolving the MNPs.
If you want to dissolve the NPs (ie destroy them) you can use a strong acid, but if you want to diperse them ie make them stable in a colloidal suspension in a medium such as water you will have to add a surfactant that is a molecule wich will change the surface properties of you nanoparticles. If you want to get a stable suspension in an organic solvent (THF, DMF, chloroform) use a molecule such as oleic acid. If you want a stable suspension in water use ethylene glycol deritatives or dendrimers containing these functionalities.
First of all, you want the magnetite nanoparticles to be dissolved in water or dispersed in water.
If the magnetite nanoparticles are not dispersed in water then they may have a hydrophobic surface. To change the nanoparticles from hydrophobic to hydrophilic you should try to functionalize the nanoparticle surface using some ligands or functional groups such as TMAOH, DMSO etc. I think by changing the surface you can easily disperse them in water and carry out your work further.
iron nanoparticles get agglomerated in water if you ultrasonicate and leave, in time dependent manner. better way is suspend them in some buffer. Another point, you must coat the nanoparticles with some surfectant to get monodisperse particles even though magnitite usaually have negative charged surface. Reason is not clear.
Hi Lega, if you do need to dissolve the particles e.g. for ICP-OES or other element analysis, sonication in aqua regia (50:50 mix of concentrated HCl and HNO3) was used in our paper for this purpose. The solution was then diluted before analysis. If you do mean disperse, rather than dissolve, then some of the suggestions above may help. You could also try modifying your biomolecule before or after biomineralisation of the magnetic nanoparticles to make it more hydrophyllic. Good luck.
As our friend Johanna Galloway mentioned if you want to dissolve your nanoparticles in aqueous solvent you can do that by using hydrochloric acid. But, it seems you want to disperse you nanoparticles. For doing that, as previous researchers answered, the best way is functionalization of your particles with hydrophilic materials such as polymers, Silica or polysaccharides. If you don’t like to change the surface of you particles, I suggest you to disperse the nanoparticles in lower concentrations.
If you want to dissolve the NPs (ie destroy them) you can use a strong acid, but if you want to diperse them ie make them stable in a colloidal suspension in a medium such as water you will have to add a surfactant that is a molecule wich will change the surface properties of you nanoparticles. If you want to get a stable suspension in an organic solvent (THF, DMF, chloroform) use a molecule such as oleic acid. If you want a stable suspension in water use ethylene glycol deritatives or dendrimers containing these functionalities.
Dissolution is possible by HCl as stated by some researchers before me...
DIssolution of the magnetite nanoparticles is possible by HCl, as stated by some researchers before. We use the procedure to check if our silica coating was successfull in completly covering the magnetite nanocores. It is also a good method to eliminate the particles with some failure in the coating.
Might separate nanoparticles with a magnet. If another material is bonded to the surface try changing the acid or basic medium. And then apply the magnetic field.
You need to modify the surface of the nanoparticles using APTES or such substances to help form a homogeneous suspension in organic solvent/water. I am assuming you do not want them to be destroyed.
If you want to dissolve the nano particles for analysis then do the following - Take the particles in concentrated sulphuric acid and add 1:1 of 30% hydrogen peroxide dropwise. Heat the solution till clear & no bubbling occurs
Since you have synthesized nanoparticles, I am assuming that you do not want to dissolve them but you want to disperse them in a solvent. Anyway, if you want to dissolve them, just pour some HCL ( %36 or lower), but if you want to disperse them for example in water, sonicate your mixture using high power sonicator with enough time. Good luck.
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