There is no the best classical force field. Actually, there are hundreds of them, and all serve different purposes and have been designed for a particular range of applications.
Open your question: which nanoparticles? what phenomena are you wanna investigate?
There is no the best classical force field. Actually, there are hundreds of them, and all serve different purposes and have been designed for a particular range of applications.
Open your question: which nanoparticles? what phenomena are you wanna investigate?
You should take time to point out what do you want to investigate. Search on literature is there any work relate to yours, which model they did they use, why did they choose that model and so on.