Extensional rheometry of magnetic dispersions

2015 ◽  
Vol 59 (1) ◽  
pp. 193-209 ◽  
Author(s):  
F. J. Galindo-Rosales ◽  
J. P. Segovia-Gutiérrez ◽  
F. T. Pinho ◽  
M. A. Alves ◽  
J. de Vicente
Keyword(s):  
Extensional Rheometry ◽  
Magnetic Dispersions

scholarly journals Extensional rheometry of model liquids: Simulations of filament stretching

2021 ◽  
Vol 33 (12) ◽  
pp. 123108
Author(s):  
Ole Hassager ◽  
Yanwei Wang ◽  
Qian Huang
Keyword(s):  
Filament Stretching ◽  
Extensional Rheometry

Preparation and Properties of Well-Defined Magnetic Particles

MRS Bulletin ◽  
1989 ◽  
Vol 14 (12) ◽  
pp. 35-40 ◽  
Author(s):  
Masataka Ozaki
Keyword(s):  
Drug Delivery Systems ◽  
Magnetic Particles ◽  
Magnetic Interactions ◽  
Recording Media ◽  
Magnetic Media ◽  
Magnetic Recording Media ◽  
Scientific Interest ◽  
Small Particles ◽  
Magnetic Dispersions ◽  
Geomagnetic Fields

Magnetic particles are important not only in the technology, but also in the function of some biosystems. In addition, they are of great scientific interest in developing a better understanding of magnetic phenomena. Ever since magnetic recording media were first prepared, extensive efforts have been made to produce improved magnetic dispersions. The particle s for magnetic media must be of single domain, high saturation magnetization, and proper coercive force. However, the magnetic interactions between such particles are very strong, and stable dispersions are difficult to obtain. Originally, their use was limited to audio tapes, but presently they are employed in a variety of applications. Thus, small particles of different magnetic properties are constituents of magnetic fluids.In 1975, magnetic particles were identified in the bodies of some bacteria, which can navigate along geomagnetic fields. It is also believed that certain animais have the ability to detect a magnetic field due to the presence of magnetic particles in their cells.Techniques are being developed to introduce new functions to materials by incorporating magnetic particles. For example, magnetic particles that are encapsulated by nonmagnetic compounds (e.g. polymers) or particles are used for binding and separating enzymes from reactant mixtures. Efforts are under way to use magnetic particles in drug delivery Systems and for diagnosis.

Addendum: Rotary Clamp in Uniaxial and Biaxial Extensional Rheometry of Polymer Melts [J. Rheol., 25 1 (1981)]

1981 ◽  
Vol 25 (6) ◽  
pp. 673-674 ◽  
Author(s):  
J. Meissner ◽  
T. Raible ◽  
S. E. Stephenson
Keyword(s):  
Polymer Melts ◽  
Extensional Rheometry

scholarly journals Enhanced Foamability with Shrinking Microfibers in Linear Polymer

Polymers ◽  
2019 ◽  
Vol 11 (2) ◽  
pp. 211 ◽  
Author(s):  
Eric Kim ◽  
Heon Park ◽  
Carlos Lopez-Barron ◽  
Patrick Lee
Keyword(s):  
Strain Hardening ◽  
Polymer Processing ◽  
Expansion Ratio ◽  
Low Frequencies ◽  
Extensional Rheometry ◽  
Enhanced Strain ◽  
Linear Viscoelastic ◽  
Cost Efficient ◽  
Strain Hardening Behavior

Strain hardening has important roles in understanding material structures and polymer processing methods, such as foaming, film forming, and fiber extruding. A common method to improve strain hardening behavior is to chemically branch polymer structures, which is costly, thus preventing users from controlling the degree of behavior. A smart microfiber blending technology, however, would allow cost-efficient tuning of the degree of strain hardening. In this study, we investigated the effects of compounding polymers with microfibers for both shear and extensional rheological behaviors and characteristics and thus for the final foam morphologies formed by batch physical foaming with carbon dioxide. Extensional rheometry showed that compounding of in situ shrinking microfibers significantly enhanced strain hardening compared to compounding of nonshrinking microfibers. Shear rheometry with linear viscoelastic data showed a greater increase in both the loss and storage modulus in composites with shrinking microfibers than in those with nonshrinking microfibers at low frequencies. The batch physical foaming results demonstrated a greater increase in the cell population density and expansion ratio with in situ shrinking microfibers than with nonshrinking microfibers. The enhancement due to the shrinkage of compounded microfibers decreasing with temperature implies that the strain hardening can be tailored by changing processing conditions.

Rotary Clamp in Uniaxial and Biaxial Extensional Rheometry of Polymer Melts

1981 ◽  
Vol 25 (1) ◽  
pp. 1-28 ◽  
Author(s):  
J. Meissner ◽  
T. Raible ◽  
S. E. Stephenson
Keyword(s):  
Polymer Melts ◽  
Extensional Rheometry

Initial Rate of Flocculation of Magnetic Dispersions in an Applied Magnetic Field

1996 ◽  
Vol 35 (9) ◽  
pp. 3186-3194 ◽  
Author(s):  
William D. Young ◽  
Dennis C. Prieve
Keyword(s):  
Magnetic Field ◽  
Applied Magnetic Field ◽  
Initial Rate ◽  
Magnetic Dispersions

Extensional rheometry of polymer multilayers: A sensitive probe of interfaces

1997 ◽  
Vol 41 (3) ◽  
pp. 671-685 ◽  
Author(s):  
Leon Levitt ◽  
Christopher W. Macosko ◽  
Thomas Schweizer ◽  
Joachim Meissner
Keyword(s):  
Extensional Rheometry

Probing microstructure of magnetic dispersions via transverse susceptibility: Experiment versus simulation

2000 ◽  
Vol 87 (9) ◽  
pp. 5657-5659 ◽  
Author(s):  
M. Benakli ◽  
P. B. Visscher ◽  
B. S. Chae ◽  
A. M. Lane
Keyword(s):  
Magnetic Dispersions ◽  
Experiment Versus

Long-Chain Branching in Metallocene-Catalyzed Polyethylenes Investigated by Low Oscillatory Shear and Uniaxial Extensional Rheometry

2002 ◽  
Vol 35 (3) ◽  
pp. 1038-1048 ◽  
Author(s):  
Anneli Malmberg ◽  
Claus Gabriel ◽  
Thomas Steffl ◽  
Helmut Münstedt ◽  
Barbro Löfgren
Keyword(s):  
Oscillatory Shear ◽  
Chain Branching ◽  
Long Chain Branching ◽  
Extensional Rheometry ◽  
Long Chain
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