Dynamics of swelling and drying in a spherical gel
Swelling is a volumetric-growth process in which a porous material expands by spontaneous imbibition of additional pore fluid. Swelling is distinct from other growth processes in that it is inherently poromechanical: local expansion of the pore structure requires that additional fluid be drawn from...
| Main Authors: | , , , |
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| Format: | Journal article |
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American Physical Society
2016
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| _version_ | 1797094147377594368 |
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| author | Bertrand, T Peixinho, J Mukhopadhyay, S MacMinn, C |
| author_facet | Bertrand, T Peixinho, J Mukhopadhyay, S MacMinn, C |
| author_sort | Bertrand, T |
| collection | OXFORD |
| description | Swelling is a volumetric-growth process in which a porous material expands by spontaneous imbibition of additional pore fluid. Swelling is distinct from other growth processes in that it is inherently poromechanical: local expansion of the pore structure requires that additional fluid be drawn from elsewhere in the material, or into the material from across the boundaries. Here, we study the swelling and subsequent drying of a sphere of hydrogel. We develop a dynamic model based on large-deformation poromechanics and the theory of ideal elastomeric gels, and we compare the predictions of this model with a series of experiments performed with polyacrylamide spheres. We use the model and the experiments to study the complex internal dynamics of swelling and drying, and to highlight the fundamentally transient nature of these strikingly different processes. Although we assume spherical symmetry, the model also provides insight into the transient patterns that form and then vanish during swelling as well as the risk of fracture during drying. |
| first_indexed | 2024-03-07T04:10:08Z |
| format | Journal article |
| id | oxford-uuid:c78c4bd7-1185-41fd-9b54-9ae9129ba596 |
| institution | University of Oxford |
| last_indexed | 2024-03-07T04:10:08Z |
| publishDate | 2016 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | oxford-uuid:c78c4bd7-1185-41fd-9b54-9ae9129ba5962022-03-27T06:45:51ZDynamics of swelling and drying in a spherical gelJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:c78c4bd7-1185-41fd-9b54-9ae9129ba596Symplectic Elements at OxfordAmerican Physical Society2016Bertrand, TPeixinho, JMukhopadhyay, SMacMinn, CSwelling is a volumetric-growth process in which a porous material expands by spontaneous imbibition of additional pore fluid. Swelling is distinct from other growth processes in that it is inherently poromechanical: local expansion of the pore structure requires that additional fluid be drawn from elsewhere in the material, or into the material from across the boundaries. Here, we study the swelling and subsequent drying of a sphere of hydrogel. We develop a dynamic model based on large-deformation poromechanics and the theory of ideal elastomeric gels, and we compare the predictions of this model with a series of experiments performed with polyacrylamide spheres. We use the model and the experiments to study the complex internal dynamics of swelling and drying, and to highlight the fundamentally transient nature of these strikingly different processes. Although we assume spherical symmetry, the model also provides insight into the transient patterns that form and then vanish during swelling as well as the risk of fracture during drying. |
| spellingShingle | Bertrand, T Peixinho, J Mukhopadhyay, S MacMinn, C Dynamics of swelling and drying in a spherical gel |
| title | Dynamics of swelling and drying in a spherical gel |
| title_full | Dynamics of swelling and drying in a spherical gel |
| title_fullStr | Dynamics of swelling and drying in a spherical gel |
| title_full_unstemmed | Dynamics of swelling and drying in a spherical gel |
| title_short | Dynamics of swelling and drying in a spherical gel |
| title_sort | dynamics of swelling and drying in a spherical gel |
| work_keys_str_mv | AT bertrandt dynamicsofswellinganddryinginasphericalgel AT peixinhoj dynamicsofswellinganddryinginasphericalgel AT mukhopadhyays dynamicsofswellinganddryinginasphericalgel AT macminnc dynamicsofswellinganddryinginasphericalgel |