8th Liquid Matter Conference September 6-10, 2011 Wien, Austria ...

P7.62Thu 811:10-14:00Model for diffusive motion of fluid in elasticnanoconfinementTankeshwar Kumar 1 and Sunita Srivastava 11 Panjab University, Computer Center, DCSA 160014, Chandigarh, IndiaIn recent years, properties of fluids have been of great interest especially when fluid is confinedto nano regime. Affect of confinements on freezing, diffusion, viscosity etc. has been studiedby many scientists [1,2]. It has been found that nano confinement of fluid affects the propertiesof fluid [3] to a great extent. The affect of structure of wall, interaction between wall and fluidparticles, roughness of wall, shape of the nanotube on the properties of confined fluid has beenstudied [3-5] and has been found play important roles. However, the properties of fluids in thepresence of elastic walls have not been studied. Therefore, in the present work we propose amodel to study diffusion of fluid confined between walls which are elastic in nature. Confiningwalls are taken to be elastic to the extent that these response even to molecular pressure exertedby fluid. The model is based on microscopic considerations wherein the configuration space ofmany body system is divided into cells. Within the cell it executes harmonic motion unless it findsa saddle point on potential energy hypersurface. The results obtained for Lennard Jones fluidsare contrasted with results obtained by considering rigid walls. It is found that if walls are madeelastic, properties of fluids can be made closer to that observed in bulk except in atomic layeradjacent to the walls.[1] J. W. G. Tyrrell and P. Attard, Phys. Rev. Lett. 87 176104 (2001)[2] J. L. Parker and P. M. Claesson, J. Phys. Chem. 98 8468 (1994)[3] Filippos D. Sofos, Theodoros E Karakasidis and Antonios Liakopulos, Phys. Rev, E 79026305 (2009)[4] Reena Devi, Jyoti Sood, Sunita Srivastava, K. Tankeshwar, Microfluidics Nanofluidics 737(2010)[5] K. Tankeshwar and Sunita Srivastava Nanotechnology 18 485714 (2007).62