Emulsifiers consist of a head which is polar,
hydrophilic, which can be anionic, cationic,
non-ionic and amphoteric and a tail which is
non-polar, electrically neutral, and
hydrophobic. The level of emulsifiers used
should be sufficient to coat the droplets. The
emulsifiers align themselves around the
droplets to form micelles with the tail towards
the oil phase and the head towards the water
phase, forming a physical barrier between the
droplets and the external phase, thus
preventing coalescence of the droplets. The
smaller the emulsifier molecule, the easier the
adsorption or arrangement around the
droplets.
Electrostatic interactions, the proximity of inter-
nal phase droplets to each other and the size
of the droplets determine the probability of
coalescence which could lead to phase
separation. Various gums and starches can be
used to stabilise natural oil-in-water emulsions
by thickening the continuous or external phase.
However, electrically charged stabilisers could
interfere with the charges on the emulsifiers,
rendering these inactive.
Page 26
Supplier Afternoon
16 May Supplier Day
This initiate began in 2017 and due to its
popularity and demand was continued into
2018. A total of 16 mini stands were hosted at
this afternoon event at the Coschem facilities
in Randpark Ridge. The afternoon turned cold
and miserable but the attendance and support
from industry was unwavering.
Afrisil
Botanichem/Unichem
Carst & Walker
Chemgrit
Chempure
ESP
Evonik Africa
IMCD
The Care Co
Orkila
Protea
Meganede
Merck
Millchem
Symrise
Vantage