Dear Dr. Jeryrajkumar Lucas ,

one can store the nanoparticles either as solid or as suspension in a solvent. It all depends upon the stability of the nanoparticles.

In each case, agglomeration of the particles is possible, however in the case of suspension, nanoparticles can be suspended for a longer time and hence will be dispersed.

For solid samples, you have to disperse them with the help of ultrasonication, prior to use. Gold and silver nanoparticles are usually kept in the form of suspension, away from light at 2–10 °C. Carbon materials like CNTs, Graphene, GO, etc can be stored in solid as well as in suspended form.

Same is the case for inorganic materials like metal oxides and composites.

Depending upon the chemical properties of your sample, you can also choose to use additional storage features: low light conditions, extreme low temperature or in vacuum.

I suggest you to have also a look at the following papers:

-Keeping Nanoparticles Fully Functional: Long-Term Storage and Alteration of Magnetite

Marc Widdrat, Monika Kumari, Éva Tompa, Mihály Pósfai, Ann M Hirt, and Damien Faivre

Chempluschem., 79(8): 1225–1233 (2014)

Available at: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4558614/

-Different Storage Conditions Influence Biocompatibility and Physicochemical Properties of Iron Oxide Nanoparticles

Jan Zaloga, Christina Janko, Rohit Agarwal, Johannes Nowak, Robert Müller, Aldo R. Boccaccini, Geoffrey Lee, Stefan Odenbach, Stefan Lyer, and Christoph Alexiou

Int J Mol Sci., 16(5): 9368–9384 (2015)

Available at: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4463593/

Best regards, Pierluigi Traverso

Dear Dr. Jeryrajkumar Lucas ,

one can store the nanoparticles either as solid or as suspension in a solvent. It all depends upon the stability of the nanoparticles.

In each case, agglomeration of the particles is possible, however in the case of suspension, nanoparticles can be suspended for a longer time and hence will be dispersed.

For solid samples, you have to disperse them with the help of ultrasonication, prior to use. Gold and silver nanoparticles are usually kept in the form of suspension, away from light at 2–10 °C. Carbon materials like CNTs, Graphene, GO, etc can be stored in solid as well as in suspended form.

Same is the case for inorganic materials like metal oxides and composites.

Depending upon the chemical properties of your sample, you can also choose to use additional storage features: low light conditions, extreme low temperature or in vacuum.

I suggest you to have also a look at the following papers:

-Keeping Nanoparticles Fully Functional: Long-Term Storage and Alteration of Magnetite

Marc Widdrat, Monika Kumari, Éva Tompa, Mihály Pósfai, Ann M Hirt, and Damien Faivre

Chempluschem., 79(8): 1225–1233 (2014)

Available at: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4558614/

-Different Storage Conditions Influence Biocompatibility and Physicochemical Properties of Iron Oxide Nanoparticles

Jan Zaloga, Christina Janko, Rohit Agarwal, Johannes Nowak, Robert Müller, Aldo R. Boccaccini, Geoffrey Lee, Stefan Odenbach, Stefan Lyer, and Christoph Alexiou

Int J Mol Sci., 16(5): 9368–9384 (2015)

Available at: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4463593/

Best regards, Pierluigi Traverso

Pierluigi Traverso

I would argue that a powder is no longer 'nano' as it can't contain free, discrete, independent particles < 100 nm...

Dear all, the following RG link gives a review paper on the importance and the different factors involved in freeze-drying of nanoparticles. My Regards

https://www.researchgate.net/publication/6680476_Freeze-Drying_of_Nanoparticles_Formulation_Process_and_Storage_Considerations

I agree with Dr Pierluigi Traverso

I also agree with Dr Pierluigi Traverso

if you have a desiccator, use that for storing them

Hi ;

Product storage depends on the particle size characteristics and surface reactivity of the nanoparticles. The products should be stored in airtight, closed and labeled packages in a cool, well-ventilated room, away from sunlight and sources of heat and away from flammable materials. The storage time depends on the stability of the nanoparticles.

With my best regards

Dear Jeryrajkumar Lucas;

To improve the stability of nanoparticles, several processes are developed to create electrostatic repulsion and/or steric discomfort between atomic assemblages to prevent agglomeration. These techniques are based on the adsorption phenomenon (a surface phenomenon by which chemical species attach themselves to a particle. creating an ionic atmosphere on the surface of particles to enhance electrostatic repulsion between them: adsorption of ions; superimposing a steric repulsion effect between particles: presence of long-chain molecules (macromolecules) on the surface of particles; combining steric and electronic effects: use of ionic polymers or surfactants. These repellents allow the various nano-sized assemblies to remain stable in the environment for several weeks.

With my best regards

 agree with Dr Pierluigi Traverso

Depending upon the chemical properties of your sample, you can also choose to use additional storage features: low light conditions, extreme low temperature or in vacuum. (20-30 nm)

That is based upon the property of the nanomaterial that you have synthesised bro !!

It depends on your nanoparticles (chemical properties). 1- When you talk about storage therefore automatically we are talking about aging and thermal degradation especially if your product is a polymer (the storage temperature). have you done such a study? 2- The duration of your storage a week, a month, or a year. For large quantities, it is difficult (humidity, agglomeration) to maintain the properties, always you need to grind and sift. I advise you to work with small quantities.

Either you can store it under vacuum dessicator or you can lyophilise your sample.

Nanomaterials are stored and 4°C with covered Aluminium foil.