<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Kariyo, Sobiroh</style></author><author><style face="normal" font="default" size="100%">Kuppers, Markus</style></author><author><style face="normal" font="default" size="100%">Badiger, Manohar V.</style></author><author><style face="normal" font="default" size="100%">Prabhakar, A.</style></author><author><style face="normal" font="default" size="100%">Jagadeesh, Bharatam</style></author><author><style face="normal" font="default" size="100%">Stapf, S.</style></author><author><style face="normal" font="default" size="100%">Blumich, B.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Morphology and chain dynamics during collapse transition of PNIPAM gels studied by combined imaging, relaxometry and Xe-129 spectroscopy techniques</style></title><secondary-title><style face="normal" font="default" size="100%">Magnetic Resonance Imaging</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">gel</style></keyword><keyword><style  face="normal" font="default" size="100%">networks</style></keyword><keyword><style  face="normal" font="default" size="100%">phase transition</style></keyword><keyword><style  face="normal" font="default" size="100%">relaxometry</style></keyword><keyword><style  face="normal" font="default" size="100%">Xe-129 spectroscopy</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2005</style></year><pub-dates><date><style  face="normal" font="default" size="100%">FEB</style></date></pub-dates></dates><number><style face="normal" font="default" size="100%">2, SI</style></number><publisher><style face="normal" font="default" size="100%">ELSEVIER SCIENCE INC</style></publisher><pub-location><style face="normal" font="default" size="100%">360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USA</style></pub-location><volume><style face="normal" font="default" size="100%">23</style></volume><pages><style face="normal" font="default" size="100%">249-253</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;The temperature-induced shape transition of poly(N-isopropylacrylamide) gels of different cross-link densities was investigated by a combination of NMR techniques allowing the characterization of both the macroscopic collapse as well as the changes on a molecular scale related to the expulsion of water from the gel network. The proton-containing gel phase was visualized by swelling in heavy water, and the volume change was monitored by proton imaging for cross-link densities between 0.5 % and 2.5 %. Above the transition temperature of 35 degrees C, gel collapse led to a volume change of up to a factor of 17 for the gel of smallest cross-link density. Two spectral lines of Xe-129 are found in the gel state and are assigned to the hydrophobic and hydrophilic parts of the network. In the collapsed state, the hydrophobic peak shows a strong shift while the hydrophilic peak disappears. A considerable shortening of both T-1 and T-2 of the gel protons upon collapse was found at a field of 4.7 T. At lower fields, the effect becomes more pronounced and qualitatively different dispersion behaviors between the swollen and the collapsed states are observed. (c) 2005 Elsevier Inc. All rights reserved.&lt;/p&gt;</style></abstract><issue><style face="normal" font="default" size="100%">2</style></issue><notes><style face="normal" font="default" size="100%">7th International Conference on Magnetic Resonance in Porous Media (MRPM7), Palaiseau, FRANCE, JUL 04-08, 2004</style></notes><custom3><style face="normal" font="default" size="100%">&lt;p&gt;Foreign&lt;/p&gt;</style></custom3><custom4><style face="normal" font="default" size="100%">1.980</style></custom4></record></records></xml>