        * Author for correspondence; Email: drasit_guha@yahoo.co.in; mukherjeeashish@yahoo.co.in                      JIS College of Engineering, KALYANI  741 235, Dist.: Nadia (W.B.) INDIA a Central Drugs Laboratory, KOLKATA  700 016 (W.B.) INDIA  Structural forces and jump limit between two fullerene surfaces in various liquids have been calculated using Lifshitz theory. Hamaker constant of 15 liquids and jump limits of 5 liquids are reported here.  !"#$: Fullerene surface, Structural forces, Jump limit.  The carbon nanotubes are important material of study during the last few years considering its application in engineering. This cylindrical carbon molecules have novel properties that make them potentially useful in many applications in nanotechnology, electronics, optics and other fields of materials science. They exhibit extraordinary strength and unique electrical properties, and are efficient conductors of heat. The carbon nanotubes are members of fullerene structure family. Spherical fullerenes are called buckyballs and cylindrical ones are called carbon nanotubes or buckytubes. Fullerenes are similar in structure to graphite, which is composed of a sheet of linked hexagonal rings, but may also contain pentagonal (or sometimes heptagonal) rings that would prevent a sheet from being planar. One of the most fascinating and unique feature of fullerene is that there is spherical empty space inside the carbon cage. This hollow space, ranges from 0.4 to 1.0 nm in diameter for C60 to C240. Such a characteristic of fullerene implies intuitively an idea of stuffing atoms into its empty space so as to alter the molecular and solid state properties of