Nature of the breakdown in the Stokes-Einstein relationship in a hard sphere fluid

SK Kumar, G Szamel, JF Douglas - The Journal of chemical physics, 2006 - pubs.aip.org
Molecular dynamics simulations of high density hard sphere fluids clearly show a
breakdown of the Stokes-Einstein equation (SE). This result has been conjectured to be due …

Gelation mechanisms

Ö Pekcan, S Kara - Modern Physics Letters B, 2012 - World Scientific
In this paper, we survey the gelation mechanisms for various polymeric systems which are
classified by the type and the strength of the cross-linkages. These are the" irreversible" gels …

Direct test of the critical exponents at the sol-gel transition

D Kaya, Ö Pekcan, Y Yılmaz - Physical Review E, 2004 - APS
The steady state fluorescence technique was used to study the sol-gel transition for the
solution-free radical cross-linking polymerization of acrylamide (AAm), with N, N …

Elucidation of multiple-point interactions of pyranine fluoroprobe during the gelation

Y Yilmaz, N Uysal, A Gelir, O Guney, DK Aktas… - … Acta Part A: Molecular …, 2009 - Elsevier
We have studied the multiple-point interactions of the pyranine (8-hydroxypyrene-1, 3, 6-
trisulfonic acid, trisodium salt; 3sPyOH) fluoroprobe with polymer chains during the free …

Critical exponents of gelation and conductivity in polyacrylamide gels doped by multiwalled carbon nanotubes

DK Aktaş, GA Evingür, Ö Pekcan - Composite Interfaces, 2010 - Taylor & Francis
Polyacrylamide (PAM) doped by multiwalled carbon nanotube (MWNT) gels were prepared
with different amounts of MWNTs varying in the range between 0.1 and 15 wt%. The PAM …

Spectral renormalization group theory on networks

E Aygün, A Erzan - Journal of Physics: Conference Series, 2011 - iopscience.iop.org
Discrete amorphous materials are best described in terms of arbitrary networks which can
be embedded in three dimensional space. Investigating the thermodynamic equilibrium as …

Monitoring the gelation of polyacrylamide–sodium alginate composite by fluorescence technique

GA Evingür, F Tezcan, FB Erim, Ö Pekcan - Phase Transitions, 2012 - Taylor & Francis
Polyacrylamide (PAAm)–sodium alginate (SA) composite was prepared with different
amounts of SA varying in the range between 0.06% and 2%(w/v). The PAAm–SA composite …

Universal behaviour of gel formation from acrylamide-carrageenan mixture around the gel point: A fluorescence study

DK Aktaş, GA Evingur, Ö Pekcan - Journal of Biomolecular …, 2006 - Taylor & Francis
The steady state fluorescence (SSF) technique was used to study the sol-gel transition, for
the solution free radical crosslinking copolymerization of acrylamide (AAm) with various …

Rigidity transition in polymer melts with van der Waals interaction

ML Wallace, B Joós, M Plischke - … Review E—Statistical, Nonlinear, and Soft …, 2004 - APS
We study the onset of rigidity near the glass transition (GT) in a short-chain polymer melt
modelled by a bead-spring model, where all beads interact with Lennard-Jones potentials …

Mathematical characterization of thermo-reversible phase transitions of agarose gels

AS Ogrenci, O Pekcan, S Kara… - Journal of Macromolecular …, 2018 - Taylor & Francis
The thermal phase transition temperatures of high (HMP) and low melting point (LMP)
agarose gels were investigated by using UV–vis spectroscopy techniques. Transmitted light …