| DOI | Trouver le DOI : https://doi.org/10.1063/1.3050096 |
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| Auteur | Rechercher : Hudson, Stephen D.; Rechercher : Hutter, Jeffrey L.; Rechercher : Nieh, Mu-Ping1; Rechercher : Pencer, Jeremy1; Rechercher : Millon, Leonardo E.; Rechercher : Wan, Wankei |
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| Affiliation | - Conseil national de recherches du Canada. Centre canadien de faisceaux de neutrons du CNRC
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| Format | Texte, Article |
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| Résumé | Poly(vinyl alcohol) (PVA) hydrogels are formed from PVA solution when physical cross-links form during freeze/thaw cycling. By applying a stress during the freeze/thaw process, PVA hydrogels with anisotropic mechanical properties are produced. We have used small- and ultra-small-angle neutron scattering to study the structure at length scales of 2 nm to 10 mum. By supplementing the neutron data with data from atomic force microscopy, we have probed a large range of length scales within which structural changes responsible for bulk anisotropy occur. We model the gel as interconnected PVA blobs of size 20-50 nm arranged in fractal aggregates extending to micrometers or tens of micrometers. Bulk mechanical anisotropy appears to be due to the alignment of blobs and connections between blobs. This information is essential for tailoring mechanical properties for applications where anisotropy is desirable such as to match the properties of natural tissue in coronary grafts and to control diffusive properties in active wound dressings. |
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| Date de publication | 2009-01-21 |
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| Maison d’édition | AIP Publishing |
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| Dans | |
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| Langue | anglais |
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| Publications évaluées par des pairs | Oui |
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| Numéro NPARC | 23004574 |
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| Exporter la notice | Exporter en format RIS |
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| Signaler une correction | Signaler une correction (s'ouvre dans un nouvel onglet) |
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| Identificateur de l’enregistrement | e80fa257-e57a-444e-8955-16d92ddfa5a3 |
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| Enregistrement créé | 2018-11-21 |
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| Enregistrement modifié | 2020-04-16 |
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