Wouter E. Roorda
Alza
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Featured researches published by Wouter E. Roorda.
Journal of Biomaterials Science-polymer Edition | 1994
Wouter E. Roorda
In the first part of this article calorimetric studies on poly (hydroxy ethyl methacrylate) (PHEMA) are presented. In the past the irregular melting curves in this type of experiment have been interpreted as evidence for the existence of different types of water in these gels. The studies presented here demonstrate that the occurrence of a glass transition in the freezing hydrogels may be responsible for this irregular melting behavior, and that this behavior is not (necessarily) an indication for the existence of different types of water. In the second part results are shown of measurements of the mobility of water in hydrogels, made by relaxation NMR. These results indicate that very rapid interchange occurs between the water molecules, and they support the conclusion that the calorimetric data mentioned above are not indicative for the existence of different classes of water in hydrogels. These results are compared with data from other fields of science, especially from fundamental freeze drying studies, which support the alternative interpretation of the calorimetric measurements.
Archive | 1997
James E. Brown; Wouter E. Roorda
Archive | 1997
Terry L. Burkoth; James E. Brown; Wouter E. Roorda
Archive | 1995
Randall G. Berggren; David J. Enscore; Susan M. Marks; James L. Osborne; Patrick S. L. Wong; Wouter E. Roorda
Archive | 1993
Wouter E. Roorda; Fred Ehnow
Archive | 1998
Wouter E. Roorda; Keith E. Dionne; James E. Brown; Jeremy C. Wright; Craig R. Davis; Steven J. Prestrelski; Stelios T. Tzannis
Archive | 1994
Wouter E. Roorda; Fred Ehnow; Estela Basso; Karly Wang; Sharon M. Fujita
Archive | 1993
Wouter E. Roorda; Fred Ehnow
Archive | 1993
Wouter E. Roorda; Fred Ehnow
Archive | 1993
Wouter E. Roorda; Fred Ehnow; Susan M. Marks