Hostname: page-component-7bb8b95d7b-l4ctd Total loading time: 0 Render date: 2024-09-18T00:49:18.015Z Has data issue: false hasContentIssue false
  • English
  • Français

Shear-Induced Structural Changes Observed in Concentrated Suspensions of Binary Blends of Fluorescent Particles of Differing Size and Color

Published online by Cambridge University Press:  15 February 2011

J. B. Jansma  and
S. Qutubuddin
J. B. Jansma
Affiliation:
GE Lighting, Technology Division, Nela Park, Cleveland, OH 44112
S. Qutubuddin
Affiliation:
Chemical Engineering Department, Case Western Reserve University, Cleveland, OH 44106
Get access

Abstract

Shear-induced structural changes were observed in suspensions of binary blends of fluorescent particles of differing size and color. Median particle size ranged from 8.3 to 13.7 microns for the nearly spherical fluorescent particles. Concentrated aqueous suspensions were studied under shear flow in a Couette fixture modified to accommodate a fused silica cup. The color of the fluorescent particle blends was observed through the cup wall using photometric methods. Suspension color near the cup wall depended upon shear rate. A color shift occurred near the shear thinning to shear thickening transition. With increasing shear rate, the color contribution from the larger particles increased as the thickening transition occurred. Draining films of these suspensions on a flat fused silica plate were also studied using photometric readings from both the free surface and through the silica plate. Color measurements indicated highly non-uniform particle size distributions within the draining films, which varied with drain time.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 289: Symposium M – Flow and Microstructure of Dense Suspensions , 1992 , 75
Copyright
Copyright © Materials Research Society 1993

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1. Hoffman, R.L., Trans. Soc. Rheol., 16, 155 (1972).Google Scholar
2. Ackerson, B.J., Clark, N.A., Physical Review Lett., 46, 2, 123 (1981).Google Scholar
3. Barnes, H.A., J. Rheology, 33(2), 329 (1989).Google Scholar
4. Boersma, W.H., Laven, J., Stein, N.H., J. Coil. Int. Sci. 149(1), 10 (1990).Google Scholar
5. Russel, W.B., Wagner, N.J., Phys. Fluids, A, 2(4), 491 (1990).Google Scholar
6. Ackerson, B.J., Hayter, J.B., Clark, N.B., Cotter, L., J. Chem. Phys., 84(4), 2344 (1986).Google Scholar
7. Laun, H.M., Bung, R., Hess, S., Lindner, P., J. Rheol., 36(4), 743 (1992).Google Scholar
8. Abbott, J.R., Tetlow, N., Graham, A.L., J. Rheol. 35(5), 773 (1991).Google Scholar
9. Melrose, J.R., Europhys. Lett., 19(1), 51 (1992).Google Scholar
10. Russel, W.B., J. Rheol., 24(3), 287 (1980).Google Scholar
11. Chong, J. S., Christiansen, E.B., Baer, A.D., J. Appl. Poly. Sci., 15, 2007 (1971).Google Scholar
12. Poslinski, A.J., Ryan, M.E., Gupta, R.K., Seshadri, S.G., and Frechette, F.J., J. Rheol., 32(8), 751 (1988).Google Scholar
13. Hoffman, R.L., J. Rheol., 36(5), 947 (1992).Google Scholar
14. Cheng, D.C.-H., Kruszewski, A.P., Senior, J.R., J. Mater. Sci., 25, 353 (1990).Google Scholar
15. Jansma, J.B., Qutubuddin, S., (to be submitted).Google Scholar
16. GE Chemical Products, Tvanhoe Road, Cleveland OH. 44112.Google Scholar
17. Butler, K.H., Fluorescent Lamp Phosphors, (Penn. State Univ. Press 1980).Google Scholar
18. Toy, M.L., Scriven, L.E., Macosko, C.W., Nelson, N.K. Jr., Olmsted, R.D., J. Rheol., 35(5), 887 (1991).Google Scholar