non newtonian system

1. PRESENTED BY-
RAHUL DEV
B.PHARM 2ND YEAR ( 4TH SEM)
S.R.M.S CET BLY.

2.  Non Newtonian system
 Plastic system
 Pseudoplastic system
 Dilatant
 Thixotropy
 Anti Thixotropy
 Reference

3.  Non Newtonian bodies are those substance
that fail to follow Newton's equation of flow.
 Liquid and solid heterogeneous dispersion
such as colloidal solutions,emulsion, liquid
suspension,ointments, and similar products
comprise this class.
 Non Newtonian System-1- Time independent
2- Time dependent

4. 1. Time independent-: Plastic flow
Pseudoplastic flow
Dilatant flow
2. Time dependent-: Thixotropy
Anti Thixotropy
Rheopexy
Anti Rheopexy

5.  Plastic flow is curve that does not pass the
origin but rather intersect the shearing stress
axis at a particular point to called as yield
value.
 A Bingham body does not begin to flow until
a shearing stress corresponding to the yield
value is exceeded.

6.  Pseudo plastic flow is shown by polymers in
solution in contrast with plastic flow which is
shown by flocculated particles suspension.

7.  Certain suspension with a high percentage of
solid exhibits an resistance to flow with
increasing rate of shear.
 such system actually increases in volume
when sheared and are hence termed
dilatants.

8.  It is an isothermal and comparatively slow
recovery on standing of a material, of
consistency lost through shearing.
 Thixotrophy can be applied only to shear
thinning system. It may have been assumed
that if the rate of shear were reduced once
the desired maximum have been reached the
down curve would be identical and super
imposable on the up curve.

10.  From time to time in the measurement of
supposedly thixotropic materials one
observes a phenomenon called negative or
antithixotropy.
 This increased in thickness or resistance to
flow with increased time of shear was
observed in rheologic analysis of magnesia
magma.

13.  Martin A , Swarbrick. J et al “Physical chemical
principles in the pharmaceutical science” ,
Varghese publishing house, third edition,
page no. 525-527.
 https://www.britannica.com/science/thixotro
py
 https://www.sciencedirect.com/topics/agricu
ltural-and-biological-sciences/thixotropy