Refer to the following references and you will get your answer with explanation.

http://www.sciencedirect.com/science/article/pii/S1877705815008279

https://books.google.it/books?id=6fvcH6SLSMIC&pg=PA19&lpg=PA19&dq=nanoparticles+size+on+interfacial+tension&source=bl&ots=RLWej2LqK1&sig=PoNo7y3AYhvN1ykHBrEk77116CU&hl=mr&sa=X&ved=0ahUKEwiqifGyhebJAhVCYA8KHexjCrkQ6AEIQDAG#v=onepage&q=nanoparticles%20size%20on%20interfacial%20tension&f=false

http://www2.warwick.ac.uk/fac/sci/chemistry/research/troisi/troisigroup/people/davidcheung/talks/dlc_rapc.pdf

Additional reading

David L. Cheung and Stefan A. F. Bon, ’Interaction of nanoparticle with ideal liquid-liquid interfaces’ Phys. Rev. Lett., 102, 066103 (2009)

David L. Cheung and Stefan A. F. Bon, ’Stability of Janus nanoparticles at fluid interfaces’Soft Matter, 5, 3969 (2009)

Sushilkumar,

the first reference talks about surfac tension of *liquids* in which nanoparticles are dispersed, so it does not answer the above question.

The 2nd referene is not readable for me on the page you showed ("you have either reached a page which is unavailable for viewing or reached your viewing limit for this book"), the page before says "it is well known that melting point and surface tension ... and wettability ... depend on particle size when the size is in nanometer order." I disagree, see below why.

Further down the page, it becomes evident that this part of the book deals with the surface tension of *liquid nano-droplets*, hence again does not answer the title question.

The 3rd reference you showed also deals with interfactial tension of liquids in nano-droplet size range.

The "further reading" is copied from the 3rd reference, I assume you did not read, and I assume it also deals with liquids.

You seem to replace thinking by google search and copy/paste. 

In my next comment, I will try to answer Abolfazl Mohamadpour Gorji's question.

Abolfazl Mohamadpour Gorji,

your question is related to "particles", so I assume you want to know about the interfacial tension between solid particles.

The surface tension of nanoparticles is clearly ONLY dependant upon the surface composition. (surface tension is clearly related with solubility parameter which is exclusively dependant on chemical structure)

What is in fact changing with particle size is the surface area!

While the interfacial *tension* will be constant (assuming the surface composition is identical with decreasing particle size), the surface area is increasing, hence surface *energy* and consequently interfacial *energy* (which is interfacial tension times surface area) increases.

The 2nd reference which  Sushilkumar had copied/pasted claims "it is well known that melting point and surface tension ... and wettability ... depend on particle size when the size is in nanometer order." The statement regarding surface tension is obviously wrong, regarding "wettability" it is correct, but why?

Not because of surface tension increasing with particle size, but because the surface area increases and so the *work* (interfacial tension times surface area) necessary to be invested for wetting a nanoparticle surface increases. (c'ed in next comment)

It is widely overlooked and ignored that for wetting a solid nanoparticle surface, the liquid must provide the same amount of (inner) surface area as the nanoparticles which you want to wet with that liquid has.

This liquid surface (several 100 m2 per gram of solid nanoparticles!) need to be created which can only be done under turbulent conditions unless tensides are involved. The higher the surface area (= the smaller the nanoparticles) the more liquid surface area must be generated which requires ever more energy.

But the interfacial tension which is a specific property does not change.

@Bernhard. Considering the history of some recent questions asked by the researcher which were rather general  in nature the idea of course is to suggest him more reading about different aspects of nanomaterials on which he is handling/working.

Question is not clear, whether it is meant interfacial tension between nanoparticles and fluid or interfacial tension between two liquids. First one was already dealt by Bernhard.

For the second

If liquids contain dissolved surface active substances interfacial tension may increase due to their adsorption. Then, there is a relation with mass of particles and their specific surface, which is larger for the smaller ones.

When interfacial tension is concerned in case of particles adsorbed at the interface it has to be emphasized that interfacial tension is not defined for liquid-liquid interface with adsorbed particles, even though a change in apparent interfacial tension may be measured. Opposite to molecules adsorbed, for particles adsorbed further interfaces are generated.

Dear friends

According to experimental datas, particles can adsorb at the interface but do not change oil−water interactions at the interface, and therefore have no effect on the interfacial tension.