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Dimiter Hadjistamov
The Yield Stress - A New Point of View. Letter to Editors.

Appl. Rheol. 13:4 (2003) 209-211

Cite this publication as follows:
Hadjistamov D: The Yield Stress - A New Point of View. Letter to Editors., Appl. Rheol. 13 (2003) 209.

Dimiter Hadjistamov
Viscoelastic Behavior of Disperse Systems with Silicone Oil and Different Fillers

Appl. Rheol. 12:6 (2002) 297-302

The rheological behavior of model suspensions with the silicone oil M20000 and different concentrations of Cab-o-sil TS 720 resp. Durcal 5 are compared. The increase of the Cab-o-sil concentration changes the flow behavior of the suspension from shear-thinning, to pseudoplastic, and to plastic flow behavior. The first normal stress difference rises at the same time at certain shear rate. The disperse systems with Durcal 5 keep the structural viscous behavior of the silicone oil even with a filler concentration of 40.5 wt%. The dependence of the first normal stress difference on shear rate represents for suspensions with Durcal 5 only one straight line with a slope of n = 2. The normal stress has double the amount of the silicone oil M20000 at given shear rate and is independent of the used Durcal 5 concentration. It was established that suspensions with the silicone oil M20000 have a first normal stress difference that can, depending on the filler type, either increase (with Cab-o-sil TS 720) or decrease (with Durcal 5) at certain shear stress with increasing filler concentration. It is to be supposed that the decrease of the normal stress at a given shear stress, with increasing Durcal concentration, is a softening effect, caused by the filler.

Cite this publication as follows:
Hadjistamov D: Viscoelastic Behavior of Disperse Systems with Silicone Oil and Different Fillers, Appl. Rheol. 12 (2002) 297.

Dimiter Hadjistamov
Dilatant Behavior of Systems with the Thixotropic Agent Aerosil 380 in the

Appl. Rheol. 9:5 (1999) 212-248

Cite this publication as follows:
Hadjistamov D: Dilatant Behavior of Systems with the Thixotropic Agent Aerosil 380 in the, Appl. Rheol. 9 (1999) 212.

D Hadjistamov
Dependance of the First Normal Stress Difference of Silicone Oils on Zero-Shear Viscosity and Molecular Weight

Appl. Rheol. 6:5 (1996) 203

Cite this publication as follows:
Hadjistamov D: Dependance of the First Normal Stress Difference of Silicone Oils on Zero-Shear Viscosity and Molecular Weight, Appl. Rheol. 6 (1996) 203.

D Hadjistamov
Relationship between the Normal Stress Difference and the Shear Stress

Appl. Rheol. 5:1 (1995) 29

Cite this publication as follows:
Hadjistamov D: Relationship between the Normal Stress Difference and the Shear Stress, Appl. Rheol. 5 (1995) 29.

D Hadjistamov, F Gutekunst
Capabilities and Limits of the Press Flow Method

Appl. Rheol. 4:1 (1994) 29

Cite this publication as follows:
Hadjistamov D, Gutekunst F: Capabilities and Limits of the Press Flow Method, Appl. Rheol. 4 (1994) 29.

D Hadjistamov
Viscoelastic Properties of Filled Silicone Fluids

Appl. Rheol. 3:2 (1993) 113

Cite this publication as follows:
Hadjistamov D: Viscoelastic Properties of Filled Silicone Fluids, Appl. Rheol. 3 (1993) 113.


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