| Giant reduction in dynamic modulus of kappa-carrageenan magnetic gels. | |
| | |
MedLine Citation:
|
PMID: 17034199 Owner: NLM Status: PubMed-not-MEDLINE |
Abstract/OtherAbstract:
|
Effects of magnetization on the complex modulus of kappa-carrageenan magnetic gels have been investigated. The magnetic gel was made of a natural polymer, kappa-carrageenan, and a ferrimagnetic particle, barium ferrite. The complex modulus was measured before and after magnetization of the gel by dynamic viscoelastic measurements with a compressional strain. The gels showed a giant reduction in the storage modulus of approximately 10(7) Pa and also in the loss modulus of approximately 10(6) Pa due to magnetization. The reduction increased with increasing volume fraction of ferrite, and it was nearly independent of the frequency. It was also found that the change in the modulus was nearly independent of the magnetization direction and irradiation time of the magnetic fields to the gel. The magnetic gels demonstrating the giant reduction in the dynamic modulus showed a large nonlinear viscoelastic response. It was observed that the magnetic gel was deformed slightly due to magnetization. The observed giant complex modulus reduction could be attributed to the nonlinear viscoelasticity and deformation caused by magnetization. Magnetism, nonlinear viscoelasticity, and effects of magnetization on the morphological and shape changes were discussed. |
| | |
Authors:
|
Tetsu Mitsumata; Kazuki Sakai; Jun-ichi Takimoto |
Related Documents
:
|
15556659 - Rapporteur's report: sources and interaction mechanisms. 8748349 - Tissue expanders and magnetic resonance imaging: the "hot" breast implant. 17622979 - Evaluation of an intracranial arachnoid cyst with meg after magnetic stimulation. 17799299 - Thermochemical remanent magnetization and thermal remanent magnetization: comparison in... 12115419 - High-gradient magnetic affinity separation of trypsin from porcine pancreatin. 17466479 - Magnetic resonance imaging of hindfoot involvement in patients with spondyloarthritides... 22134779 - Fe(3)o (4)-pei-ritc magnetic nanoparticles with imaging and gene transfer capa... 11550259 - Creating a library of generalized fourier sampling patterns for irregular 2d regions of... 6608219 - Multiplane magnetic resonance imaging of the heart and major vessels: studies in normal... |
Publication Detail:
|
Type: Journal Article |
Journal Detail:
|
Title: The journal of physical chemistry. B Volume: 110 ISSN: 1520-6106 ISO Abbreviation: J Phys Chem B Publication Date: 2006 Oct |
Date Detail:
|
Created Date: 2006-10-12 Completed Date: 2007-08-17 Revised Date: - |
Medline Journal Info:
|
Nlm Unique ID: 101157530 Medline TA: J Phys Chem B Country: United States |
Other Details:
|
Languages: eng Pagination: 20217-23 Citation Subset: - |
Affiliation:
|
Department of Polymer Science and Engineering, Faculty of Engineering, Yamagata University, 4-3-16 Jonan, Yonezawa 992-8510, Japan. tetsu@yz.yamagata-u.ac.jp |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
|
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Efficient photocatalytic degradation of phenol over Co3O4/BiVO4 composite under visible light irradi...
Next Document: Viscoelastic micellar solutions in nonionic fluorinated surfactant systems.