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    In situ photon transmission technique for studying ageing in acrylamide gels due to multiple swelling
    (Elsevier Sci Ltd, 1998) Pekcan, O; Catalgil-Giz, H; Caliskan, M
    In situ photon transmission experiments were performed using an ultra-violet-visible (u.v.-vis) spectrometer during the multiple swelling of polyacrylamide (PAAm) gel in water. The transmitted light intensity, I, decreased continuously as the PAAm gel swelled. The decrease in I, was attributed to the increase in scattered light intensity which might have orginated from the contrast between 'frozen blob clusters' and holes in the swollen gel. It was observed that the correlation length, xi(c), increased by 1/4 power of the swelling time. The sudden increase in the gel relaxation time, tau, was attributed to the rupture of the network structure after the eighth swelling step during multiple swelling of the PAAm gel. (C) 1998 Elsevier Science Ltd. All rights reserved.
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    Semi-empirical potentials for CuI
    (Natl Inst Optoelectronics, 2005) Dalgic, SS; Gurbuz, H; Caliskan, M; Ozgec, O
    We have investigated the prospects for developing semi-empirical model potentials for use in the studies of structural properties of CuI with integral equation theories. The point of view adopted requires that only short range two atom and three atom interactions appear. A three-body potential of Tersoff has been tasted with the hypernetted chain integral equation by calculating the pair correlation function for CuI at 710 K. The two-body and three-body Kohen-Tully-Stillinger empirical interatomic potential has been applied. The structural results of liquid CuI have been compared with experiment and those obtained by rigid ion potentials.