Summary
Summary Key terms semester 2
- Module
- Pharmacy - Physical pharmacy
- Institution
- University Of East Anglia
Pharmacy - physical pharmacy 1st and 2nd semester summaries Bullet points, key notes, images and diagrams
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Key TermsSolution-dispersion of molecules of a material in a liquid medium and is transparent
Suspension- a dispersion of solid particles of a material in a liquid medium and is
generally cloudy
Colloid- suspension where particles are 0.1-1μm
Stern (fixed) layer- attraction of opposite charges to particle surface partially neutralise
the surface charge of the particle (counter-ions)
Diffuse Layer- co-ions neutralise the surface charge but are mobile
Shear Plane- barrier between the fixed and diffuse layers with counter-ions in the fixed
layer and co-ions in the diffuse layer
ζ Potential- governs electro-kinetic behaviours of a particle and is the potential
difference between the surface of the particle and the bulk medium
Coalescence- 2 particles collide and merge to form one bigger particle
Ostwald Ripening- evaporation of atoms from a cluster which transfer to another cluster
Emulsion- 2 immiscible liquids with 2 phases (continuous and dispersed) and droplet
size 1-100 μm
Interfacial tension- work required to increase the area of contact between 2 phases
Cracking- phase separation in an emulsion
Surface tension (γ)- cohesive forces between liquid molecules responsible for surface
tension
Stress (σ)- force per unit area
Strain (ε)- deformation of a body in response to a stress
Shear stress (σ)- force per unit area required to cause flow
Shear strain (γ)- velocity gradient or difference in velocity between 2 planes of a liquid
Viscosity (η)- resistance of a fluid to flow
Reduced Viscosity (ηsp/C)- ratio between specific viscosity and concentration
Specific Viscosity (ηsp)- relative increase in viscosity of the solution/viscosity of the
solvent
Shear Thinning- viscosity decreases with increased shear rate
Shear Thickening- viscosity increases with shear rate
Thixotropy- time dependant shear thinning
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