| dc.contributor |
Biomedical Engineering and Mechanics |
|
| dc.creator |
Ghosh, Suvojit |
|
| dc.creator |
Tehrani, Mehran |
|
| dc.creator |
Al-Haik, Marwan S. |
|
| dc.creator |
Puri, Ishwar K. |
|
| dc.date |
2017-09-20T18:21:16Z |
|
| dc.date |
2017-09-20T18:21:16Z |
|
| dc.date |
2015-01-30 |
|
| dc.date |
2017-09-20T18:21:16Z |
|
| dc.date.accessioned |
2023-03-01T18:51:57Z |
|
| dc.date.available |
2023-03-01T18:51:57Z |
|
| dc.identifier |
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. |
|
| dc.identifier |
http://hdl.handle.net/10919/79226 |
|
| dc.identifier |
https://doi.org/10.3390/ma8020474 |
|
| dc.identifier.uri |
http://localhost:8080/xmlui/handle/CUHPOERS/281569 |
|
| dc.description |
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. |
|
| dc.description |
Published version |
|
| dc.format |
application/pdf |
|
| dc.format |
application/pdf |
|
| dc.language |
en |
|
| dc.publisher |
MDPI |
|
| dc.rights |
Creative Commons Attribution 4.0 International |
|
| dc.rights |
http://creativecommons.org/licenses/by/4.0/ |
|
| dc.subject |
functional grading |
|
| dc.subject |
nano composites |
|
| dc.subject |
nanoindentation |
|
| dc.subject |
magnetic nanoparticles |
|
| dc.title |
Patterning the Stiffness of Elastomeric Nanocomposites by Magnetophoretic Control of Cross-linking Impeder Distribution |
|
| dc.title |
Materials |
|
| dc.type |
Article - Refereed |
|
| dc.type |
Text |
|