Conformational transitions of a diblock polyampholyte in 2 and 3 dimensions
- نوع فایل : کتاب
- زبان : انگلیسی
- مؤلف : J.B. Imbert a, J.M. Victor a,), N. Tsunekawa b, Y. Hiwatari b
- چاپ و سال / کشور: 1999
Description
We report here the first extensive study of the conformational transitions of a diblock polyampholyte made of two symmetric blocks, one positively, the other negatively charged.. Results are obtained by means of a Monte Carlo simulation on a square resp. cubic. lattice in 2 resp. 3. dimensions, using the Bond Fluctuation algorithm together with a Multiple Histogram method. In both dimensions, an early i.e. high temperature. transition is observed which is shown to correspond to the pairing of both blocks together, resulting in a ‘super-coil’, each ‘super-monomer’ being a dipole made of one positive and one negative monomer. Phenomenological characteristics of this pairing transition are given and its specificity is outlined. A second transition is also observed at a lower temperature in both dimensions. However, whereas it is a mere coil-globule transition of the ‘super-coil’ in three dimensions, it happens to be rather a folding in two dimensions because of topological constraints. q1999 Elsevier Science B.V. All rights reserved.
Physics Letters A 258 1999. 92–98 Received 10 March 1999; received in revised form 18 May 1999; accepted 19 May 1999
