What is the order of 2D polymer escape transition?

Details What is the order of 2D polymer escape transition? What is the order of 2D polymer escape transition?

2007-04-14

arxiv.org/abs/0704.1857v2

Phys. Rev. E 76, 021108 (2007)

Physics

Condensed Matter

Statistical Mechanics

16 pages, 21 figures, and 4 tables. Edited for typos

Scientific paper

10.1103/PhysRevE.76.021108

An end-grafted flexible polymer chain in 3d space between two pistons undergoes an abrupt transition from a confined coil to a flower-like conformation when the number of monomers in the chain, N, reaches a critical value. In 2d geometry, excluded volume interactions between monomers of a chain confined inside a strip of finite length 2L transform the coil conformation into a linear string of blobs. However, the blob picture raises questions on the nature of this escape transition. To check the theoretical predictions based on the blob picture we study 2d single polymer chains with excluded volume interactions and with one end grafted in the middle of a strip of length 2L and width H by simulating self-avoiding walks on a square lattice with the pruned-enriched-Rosenbluth method (PERM). We estimate the free energy, the end-to-end distance, the number of imprisoned monomers, the order parameter, and its distribution. It is shown that in the thermodynamic limit of large N and L but finite L/N, there is a small but finite jump in several average characteristics, including the order parameter. We also present a theoretical description based on the Landau free energy approach, which is in good agreement with the simulation results. Both simulation results and the analytical theory indicate that the 2d escape transition is a weak first-order phase transition.

Affiliated with

Also associated with

No associations

Rating

What is the order of 2D polymer escape transition? does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with What is the order of 2D polymer escape transition?, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and What is the order of 2D polymer escape transition? will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-730398