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Shape Transition of Magnetic Field Sensitive Polymer Gels
Abstract
Magnetic field sensitive gels, called ferrogels, are chemically cross-linked polymer networks swollen by a ferrofluid. The monodomain magnetic particles, with a typical size of about 10 nm, couple the shape of the polymer gel to the nonuniform external magnetic field. Shape distortion occurs instantaneously and disappears abruptly when an external magnetic field is applied or removed, respectively. This work provides a thermodynamic analysis of shape transition based on the free energy of the swollen network that includes the elasticity of network chains as well as magnetic interactions of finely dispersed solid particles with the external field. It is shown that noncontinuous shape transition is due to a shift of equilibrium state from one local minimum to another one, similar to a first-order phase transition. The discussions presented here may be useful for the design of magnetically active soft polymeric actuators.
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Cited by
Thermo- and pH-responsive polymers in drug delivery☆
SCHMALJOHANN, D. (2006) · Advanced Drug Delivery Reviews · doi:10.1016/j.addr.2006.09.020 · Cited by 3,023
Soft Actuators for Small-Scale Robotics
Hines, L., Petersen, K., Lum, G. Z., & Sitti, M. (2017) · Advanced Materials · doi:10.1002/adma.201603483 · Cited by 1,337
New directions in thermoresponsive polymers
Roy, D., Brooks, W. L. A., & Sumerlin, B. S. (2013) · Chemical Society Reviews · doi:10.1039/c3cs35499g · Cited by 1,311
Magnetic Hydrogels and Their Potential Biomedical Applications
Li, Y., Huang, G., Zhang, X., Li, B., Chen, Y., Lu, T., Lu, T. J., & Xu, F. (2013) · Advanced Functional Materials · doi:10.1002/adfm.201201708 · Cited by 721
Electromagnetic activation of shape memory polymer networks containing magnetic nanoparticles
Schmidt, A. M. (2006) · Macromolecular Rapid Communications · doi:10.1002/marc.200600225 · Cited by 518
Metadata
- Authors
- Szabó, D., Szeghy, G., & Zrínyi, M.
- Venue
- Macromolecules
- Publisher
- American Chemical Society (ACS)
- Published
- 1998-08-25
- Volume
- 31
- Issue
- 19
- Pages
- 6541-6548
- ISSN
- 0024-9297 (ISSN-L)
- 1520-5835
- OpenAlex
- W2074819090
- Cited by
- 224
- References
- 0
- FWCI
- 9.07
- Type
- journal article
- Language
- en
- Open access
- closed
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- Szabó, D., Szeghy, G., & Zrínyi, M. (1998). Shape Transition of Magnetic Field Sensitive Polymer Gels. Macromolecules. https://doi.org/10.1021/ma980284w
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