PMID- 17269807 OWN - NLM STAT- PubMed-not-MEDLINE DCOM- 20070627 LR - 20070220 IS - 0743-7463 (Print) IS - 0743-7463 (Linking) VI - 23 IP - 5 DP - 2007 Feb 27 TI - Colloidal phase separation of concentrated PNIPAm solutions. PG - 2404-7 AB - In the concentration range of 1-6 wt %, solutions of a thermosensitive polymer (poly-N-isopropylacrylamide (PNIPAm), Mw = 1.4 x 10(5) g.mol(-1)) are shown to phase separate in the form of dense stable colloids of nearly pure polymer. Diffuse wave spectroscopy and small-angle neutron scattering both provide consistent measurements of the colloidal size as a function of temperature. Results are in agreement with a Cahn regime of spinodal decomposition blocked at an early stage, prior to a growth that would lead to a macroscopic phase separation. [Early results of this work were presented at the 231st American Chemical Society National Meeting, Symposium on Amphiphilic Polymers, Atlanta, GA, 2006, March 26-30.]. FAU - Balu, Caroline AU - Balu C AD - LIONS, SCM-C.E.A. Saclay, F-91191 Gif sur Yvette Cedex, France. FAU - Delsanti, Michel AU - Delsanti M FAU - Guenoun, Patrick AU - Guenoun P FAU - Monti, Fabrice AU - Monti F FAU - Cloitre, Michel AU - Cloitre M LA - eng PT - Journal Article DEP - 20070202 PL - United States TA - Langmuir JT - Langmuir : the ACS journal of surfaces and colloids JID - 9882736 EDAT- 2007/02/03 09:00 MHDA- 2007/02/03 09:01 CRDT- 2007/02/03 09:00 PHST- 2007/02/03 09:00 [pubmed] PHST- 2007/02/03 09:01 [medline] PHST- 2007/02/03 09:00 [entrez] AID - 10.1021/la0627821 [doi] PST - ppublish SO - Langmuir. 2007 Feb 27;23(5):2404-7. doi: 10.1021/la0627821. Epub 2007 Feb 2.