Hostname: page-component-55f67697df-xq6d9 Total loading time: 0 Render date: 2025-05-10T15:46:47.345Z Has data issue: false hasContentIssue false
  • English
  • Français

SANS Study of Chirality and Order in Liquid Crystalline Cellulose Suspensions

Published online by Cambridge University Press:  22 February 2011

W.J. Orts ,
J.-F. Revol ,
L. Godbout  and
R.H. Marchessault
W.J. Orts
Affiliation:
NIST, Gaithersburg, MD 20899
J.-F. Revol
Affiliation:
PAPRICON, McGill Pulp and Paper Research Centre, Montreal, PQ, H3A 2A7 Canada
L. Godbout
Affiliation:
PAPRICON, McGill Pulp and Paper Research Centre, Montreal, PQ, H3A 2A7 Canada
R.H. Marchessault
Affiliation:
PAPRICON, McGill Pulp and Paper Research Centre, Montreal, PQ, H3A 2A7 Canada
Get access

Abstract

Small angle neutron scattering, SANS, was used to describe the magnetic alignment and in situ shear ordering of polyelectrolytic, liquid crystalline cellulose microfibrils in aqueous (D2O) suspension. In a 2.4 Tesla magnetic field, microfibril suspensions exhibit anisotropic chiral nematic (cholesteric) ordering in which the distance between nematic planes along the cholesteric axis is shorter than between rods within a nematic plane. This is consistent with the hypothesis that cellulose microfibrils are helically twisted rods. During shear, the SANS interference peaks perpendicular to the flow direction sharpen with increasing shear rate. Yet, the highest degree of alignment (for microfibrils with axial ratios of ~45) was observed a short period after the cessation of shear flow.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 376: Symposium BB – Neutron Scattering in Materials Science , 1994 , 317
Copyright
Copyright © Materials Research Society 1995

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.)

Article purchase

Temporarily unavailable

References

REFERENCES

1 Certain commercial materials and equipment are identified in this paper in order to specify the experimental procedure. This in no way implies recommendation or endorsement by the National Institute of Standards and Technology.Google Scholar
2 Marchessault, R.H., Morehead, F.F., and Walter, N.M., Nature 184, 632 (1959).Google Scholar
3 Revol, J.-F., Bradford, H., Giasson, J.H., Marchessault, R.H., Gray, D.G., Int. J. Biol. Macromol. 14, 170, (1992).Google Scholar
4 Revol, J.-F., Godbout, L., Dong, X.-M., Gray, D.G., Chanzy, H., Maret, G., Liq. Cryst. 16(1), 127, (1994).Google Scholar
5 Revol, J.F., and Marchessault, R.H., Int. J. Biol. Macromol. 15, 329 (1994).Google Scholar
6 Revol, J.-F., Orts, W.J., Godbout, L., Marchessault, R.H., Proc. of the ACS, Div. of PMSE 71, 334 (1994).Google Scholar
7 Straley, J.P., Phys. Rev. A 14, 1835 (1976).Google Scholar
8 Straty, G.C., J. Res. Natl. Inst. Stand. Technol. 94, 259, (1989).Google Scholar
9 Oldenbourg, R., Wen, X., Meyer, R.B., Caspar, D.L.D., Phys. Rev. Lett. 61, 1851, (1988).Google Scholar
10 Onogi, S., and Asada, T. in Rheology, edited by Astarita, G., Marrucci, G., Nicolais, L., (Plenum: New York, 1980; Vol. 3).Google Scholar
11 Hongladarom, K., Burghardt, W.R., Baek, S.G., Cementwala, S., Magda, J.J., Macromolecules 26, 785, (1993).Google Scholar
12 Podgornik, R., Rau, D.C., Parsegian, V.A., Macromolecules 22, 1780, (1989).Google Scholar