Patterning the Stiffness of Elastomeric Nanocomposites by Magnetophoretic Control of Cross-linking Impeder Distribution
| dc.contributor.author | Ghosh, Suvojit | en |
| dc.contributor.author | Tehrani, Mehran | en |
| dc.contributor.author | Al-Haik, Marwan S. | en |
| dc.contributor.author | Puri, Ishwar K. | en |
| dc.contributor.department | Biomedical Engineering and Mechanics | en |
| dc.date.accessioned | 2017-09-20T18:21:16Z | en |
| dc.date.available | 2017-09-20T18:21:16Z | en |
| dc.date.issued | 2015-01-30 | en |
| dc.date.updated | 2017-09-20T18:21:16Z | en |
| dc.description.abstract | We report a novel method to pattern the stiffness of an elastomeric nanocomposite by selectively impeding the cross-linking reactions at desired locations while curing. This is accomplished by using a magnetic field to enforce a desired concentration distribution of colloidal magnetite nanoparticles (MNPs) in the liquid precursor of polydimethysiloxane (PDMS) elastomer. MNPs impede the cross-linking of PDMS; when they are dispersed in liquid PDMS, the cured elastomer exhibits lower stiffness in portions containing a higher nanoparticle concentration. Consequently, a desired stiffness pattern is produced by selecting the required magnetic field distribution <i>a priori</i>. Up to 200% variation in the reduced modulus is observed over a 2 mm length, and gradients of up to 12.6 MPa·mm<sup>−1</sup> are obtained. This is a significant improvement over conventional nanocomposite systems where only small unidirectional variations can be achieved by varying nanoparticle concentration. The method has promising prospects in additive manufacturing; it can be integrated with existing systems thereby adding the capability to produce microscale heterogeneities in mechanical properties. | en |
| dc.description.version | Published version | en |
| dc.format.mimetype | application/pdf | en |
| dc.identifier.citation | Ghosh, S.; Tehrani, M.; Al-Haik, M.S.; Puri, I.K. Patterning the Stiffness of Elastomeric Nanocomposites by Magnetophoretic Control of Cross-linking Impeder Distribution. Materials 2015, 8, 474-485. | en |
| dc.identifier.doi | https://doi.org/10.3390/ma8020474 | en |
| dc.identifier.uri | http://hdl.handle.net/10919/79226 | en |
| dc.language.iso | en | en |
| dc.publisher | MDPI | en |
| dc.rights | Creative Commons Attribution 4.0 International | en |
| dc.rights.uri | http://creativecommons.org/licenses/by/4.0/ | en |
| dc.subject | functional grading | en |
| dc.subject | nano composites | en |
| dc.subject | nanoindentation | en |
| dc.subject | magnetic nanoparticles | en |
| dc.title | Patterning the Stiffness of Elastomeric Nanocomposites by Magnetophoretic Control of Cross-linking Impeder Distribution | en |
| dc.title.serial | Materials | en |
| dc.type | Article - Refereed | en |
| dc.type.dcmitype | Text | en |