Surfactants Flashcards
Define HLB
hydrophilic, lipophilic Balance of surfactant
Value range of HLB?
1-20
Low HLB emulsifier soluble in?
Oil
Surfactant with Positively charged hydrophilic polar group is called?
Cationic
Surfactant with Non-charged hydrophilic polar group?
Nonionic
hydrophilic polar group charge of Zwitterionic
Positive and Negative
Define CPP
Critical Packing Parameter
Define CMC
Critical Miscele Concentration, the conc. at which micelles form between water and air.
What are two types of Dispersing agents
surfactants, Polymeric
Define Dispersing agent
Migrates Solid and liquid interfaces and causes stability
High HLB emulsifier soluble in?
Water
Very Low HLB emulsifier used as?
Anti-foaming agent
Very High HLB emulsifier used as?
Detergent or Solubiliser
What type of emulsion has hydrophobic head facing in and hydrophilic tail facing out?
O/W
What type of emulsion has hydrophobic head facing out and hydrophilic tail facing in?
W/O
HLB= E + P/5 for what types of Surfactant?
Alcohol Ethoxylates
Equation for HLB of Polyhydroxy Fatty acid esters
HLB = 20 ( 1 - S/A)
How to calculate HBL for complex ionic Surfactants?
HLB = 7 + (sum of hydrophilic groups - sum of Lipophilic groups)
HLD stands for?
Hydrophilic, lipophilic difference
equation for HLD?
HLD = Cc - K(EACN) - a(T-25) + F(s)
HLD = 0
Balanced
HLD > 0
w/o
HLD < 0
o/w
