Abstract
Extensional viscosity of rod particle suspensions in polymer solutions is studied experimentally. Rod particle suspensions were prepared by dispersing FeOOH rods in polyacrylamide (molecular weight of 5-6 M) solutions in a glycerin-water mixture. The diameter of rod particles was 100 nm and the aspect ratio was 4.3, 8.7 and 15.6. Particle volume fraction was 0.005-0.02. The extensional viscosity was measured by the capillary thinning method using the commercially available CaBER. Under the experimental condition both the polymer solution and particle suspensions are dilute. Particle-particle interaction is neglected in the solutions which are stretched by the extensional flow at the bulk. The result shows that extensional viscosity of the rod suspension in polymer solution decreases with the increase in particle volume fraction. The decrease is ascribed to the change in polymer conformation from the stretched state in the bulk flow to the less stretched state in shear flow developed near the particle to match the no-slip condition at the particle surface.
| Original language | English |
|---|---|
| Pages (from-to) | 197-206 |
| Number of pages | 10 |
| Journal | Korea Australia Rheology Journal |
| Volume | 27 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 2015 Aug 1 |
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Keywords
- Batchelor theory
- Capillary thinning
- Extensional viscosity
- Polymer conformation
- Relaxation time
ASJC Scopus subject areas
- Condensed Matter Physics
- Materials Science(all)
Cite this
Extensional behavior of rod suspension in dilute polymer solution. / Han, Hyejin; Kim, Chongyoup.
In: Korea Australia Rheology Journal, Vol. 27, No. 3, 01.08.2015, p. 197-206.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Extensional behavior of rod suspension in dilute polymer solution
AU - Han, Hyejin
AU - Kim, Chongyoup
PY - 2015/8/1
Y1 - 2015/8/1
N2 - Extensional viscosity of rod particle suspensions in polymer solutions is studied experimentally. Rod particle suspensions were prepared by dispersing FeOOH rods in polyacrylamide (molecular weight of 5-6 M) solutions in a glycerin-water mixture. The diameter of rod particles was 100 nm and the aspect ratio was 4.3, 8.7 and 15.6. Particle volume fraction was 0.005-0.02. The extensional viscosity was measured by the capillary thinning method using the commercially available CaBER. Under the experimental condition both the polymer solution and particle suspensions are dilute. Particle-particle interaction is neglected in the solutions which are stretched by the extensional flow at the bulk. The result shows that extensional viscosity of the rod suspension in polymer solution decreases with the increase in particle volume fraction. The decrease is ascribed to the change in polymer conformation from the stretched state in the bulk flow to the less stretched state in shear flow developed near the particle to match the no-slip condition at the particle surface.
AB - Extensional viscosity of rod particle suspensions in polymer solutions is studied experimentally. Rod particle suspensions were prepared by dispersing FeOOH rods in polyacrylamide (molecular weight of 5-6 M) solutions in a glycerin-water mixture. The diameter of rod particles was 100 nm and the aspect ratio was 4.3, 8.7 and 15.6. Particle volume fraction was 0.005-0.02. The extensional viscosity was measured by the capillary thinning method using the commercially available CaBER. Under the experimental condition both the polymer solution and particle suspensions are dilute. Particle-particle interaction is neglected in the solutions which are stretched by the extensional flow at the bulk. The result shows that extensional viscosity of the rod suspension in polymer solution decreases with the increase in particle volume fraction. The decrease is ascribed to the change in polymer conformation from the stretched state in the bulk flow to the less stretched state in shear flow developed near the particle to match the no-slip condition at the particle surface.
KW - Batchelor theory
KW - Capillary thinning
KW - Extensional viscosity
KW - Polymer conformation
KW - Relaxation time
UR - http://www.scopus.com/inward/record.url?scp=84940386416&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84940386416&partnerID=8YFLogxK
U2 - 10.1007/s13367-015-0020-1
DO - 10.1007/s13367-015-0020-1
M3 - Article
AN - SCOPUS:84940386416
VL - 27
SP - 197
EP - 206
JO - Korea Australia Rheology Journal
JF - Korea Australia Rheology Journal
SN - 1226-119X
IS - 3
ER -